Popular Science Monthly 1926-05: Vol 108 Iss 5

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You can make at home for '5 SEE PAGE 7I S22 82 S2 Se SB eee eee ee * ‘1lLOOO IN CASH PRIZES EVERY MONTH AY 24 Page 14 |

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Swing this trusty hatchet straight and true Look for the HAT you want in a hatchet,—the Plumb hatchet has—plus a won- derful safety device. i The tough, hard edge of this hatchet keeps its keenness — Plumb tempering methods are famous. The strength of the eye is assured by Plumb armor-plate heat treatment. And the head is hard- ened for husky work. Balance and power for hard, deep cutting or for accurate, careful slicing. This blade goes where you send it! And, whether new or old, your Plumb is safe to swing. For the Plumb Take-Up Wedge gives you a tight head always; a turn of the Wedge takes up any shrinkage in the handle. You get these features in Plumb tools only. You get them by simply looking for the Red Handle and the Black Head. Buy the trusty Plumb Hatchet — easy to find in any hardware store. Easy to swing straight and true! FAYETTE R. PLUMB, Inc. © Philadelphia, U.S. A. Instantly, with a turn of the wrist, you retighten the head of any Plumb tool. V-shape of wedge expands wood of handle against all sides of eye, all the way in. DOUBLE LIFE ————— Hammers Hatchets Files Sledges Axes Red Handle WITH THE Black Head (Color Combina- tion Registered as Trade Mark, U.S. Pat. Off.) EXCLUSIVELY PLUMB © This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6, May, 19: 66

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May, 1926 POPULAR SCIENCE MONTHLY 1 The defender at the . gates. Defective raw material “shall not pass’’ this alert tester. One reason why tele- phones are made right. "They shall not pass~ ITH this watchword of determination the French held back their foe at Verdun. Today ‘“‘they shall not pass’? is a watchword equally determined in Western Electric tele- phone making—only here it always means ‘“‘de- fective materials and apparatus shall not pass. ” Inspection, inspection, inspection is the order of the day in this work of making telephones and telephone equipment. From the raw material stage, when strength tests and quality tests are rigorously applied, through every step of manufacture, a telephone must qualify for service—and do so before a chain of critical inspectors. The acid test. Thecoatingona telephone must provethatitcan resistcorrosion. : This insistence on high standards of materials in is V ; ic’ -to- A hine imitates the hand, and workmanship is Western Electric’s day-to ie epee ep tr Back of day part in making Bell telephone service the receiver, An endurance test. your planiinte standard of the world. estern Elechric SINCE 1882 MANUFACTURERS FOR THE BELL SYSTEM r1S] This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6.

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MAY, 1926; Vol. 108, No. 5 25 cents a Copy; $2.50 a Year Popular Science Monthly The Magazine of Invention and Discovery Published in New York City at 250 Fourth Avenue Don’t Miss ested in a home of his own— and who is not?—will find an immense amount of useful informa- tion on the subjects of home building and home keeping in our interesting articles by John R. McMahon. Each month this noted expert discusses in detail some vital problem of home ownership, giving valuable sugges- tions from his long experience. On page 28 of this issue he tells how to build a new home out of an old one. Next month he will explain the mys- teries of architects’ blueprints in such a way that you will be surprised how easy it is to read and understand them. en man who is at all inter- ND don’t forget, there’s an- other absorbing $1,000 Pic- ture Contest this month. Next month there will be still another one. In this unusual series of contests you have just as good a chance as anyone to win one of the big i \ sure of a lot of entertainment to In This Popular Science Institute of Standards......... Oi UEN MERNEADADE,: 0. 5 cs nc os 0ess.cvaews sca s* 9 Page 6 Be ee ee OO So 11 By Edgar C. Wheeler ROS © oe re 14 The Typical American er ae MOM (ae eens 16 He Lived Two Great Lives.... oe: Lee canes SRw By Robert E. Martin Now Come Oil-Electric Locomotives........... 19 A Game of Glorious Uncertainties............. 20 By George Lee Dowd, Jr. How Large Can a Star ee eee eee 22 The World’s Greatest Puzzles................. 23 By Sam Loyd Unique Radio Pen Makes Ink Copies......... 25 The Army ene Your Boy... ..... 0. .6.ccesee 26 By Arthur Grahame How to Remodel an Old House............... 28 By John R. McMahon Only the Daring Work for Him............... 31 By Earl Chapin May Hungry Moths Cost Us Millions.............. 33 By G. B. Seybold Planning the World’s Largest Airship.......... 34 By John K. Martin boot. Turn to page 14 of this issue and see how wide-awake you are. With this X-ray ap- paratus, scientists now study ancient mummies without re- moving the wrap- pings. See page 38 for pictures of King Tut- ankhamen’s coffin F THE many fascinating “ to make it yourself” articles which appear from month to month How a s Features in our Home Workshop Department, few have made our fingers so “‘itch to get at it”? as Captain McCann’s de. tailed description, beginning in this issue, of how to build the beautiful model of an old-time Spanish galleon, pictured on the cover of this issue, The constructional details which be- gin on page 71 will be concluded next month. * * * NE of the finest works of handicraft to be found any- where in the world has just come to light. It is the marvelous gold- engraved coffin ofancient Egypt’s Pharaoh, Tutankhamen. Don't fail to look at the pictures of this magnificent sarcophagus on page 38. As you wonder at its intri- cate craftsmanship, you will real- ize how science, delving into for- gotten ages, is enriching our knowledge of the world we live in. Every month Poputar SCIENCE MonTHLY aims to give you new glimpses of the world’s unfolding panorama. Issue—200 Articles and Pictures, including Pag Page an Won eat TRON Ss 5s6 Sia aris owaaws aw 36 Making History in Aeronautics............... 50 Where Movies Get Their “Props” ............ 37 When the American Eagle Is Captured........ 52 Odd Bits from the Records of Science.......... 38 Strawberry Patch in a Barrel................. 52 Ancient Fossils with Life Forms............... 40 Three Texas Lemons an Armful............... 52 Giant Cranes in Record Feats................ ae 63 AS eis aaicny Niimber...... 6... 6... me Stormproof Three-in-One Dirigible............ 42 Fashions y ogy from Egg Shells.... ........ 53 Marimba Produced by Electric Fans.. ..... 42 How YouC BOW @ Meat]... .. . scccseccoes 53 Storm Door from a Screen Door.............. ae wb Sete Set of Postage Stamps.........-.- 53 Huge Dam to Form Mountain Lake........... 43 Howa Great City Protects Its Food. ......... 54 The Cunious side OF THINGS... 6.06. 002s. cscs 44 Boats for Land and Water..................- 55 Cold Light Obtained with Liquid Lens......... 46 Progress of Science. ...............0.00e eee 56 Women Skilful at Electric Work.............. 46 Novel Devices Lighten ee Tasks....... 58 Lock Has 1024 Combinations................. 46 Prize Winners in Radio Contest.. ee ml, Discarded Grindstones Make Fine Walls....... 46 Radio—Here and There.................---55 62 Work While You Telephone.................. 47 How to Test Your B Battery...............-: 63 A Novel Swing for Children.................. 47 You Can Now “Turn on the Ice’’............. 64 Free Shade for Automobilists................. 47 Useful Additions to Your Car...............55 65 Grass Catcher Fills Evenly................... ai Wow to Pink the Best Car... 6... cw oc ce eee ee 66 Giant Engineer Runs Miniature Train......... 48 By Martin Bunn Baseball Star Makes His Own Bats........... 48 Newest Aids for the Autoist...............0055 68 ag Ple-g Eng in 4 28 Serisk he ae H 1 e Made is Tractor Himself me 49 ae Seana ome Workshop............... es usic Lesson Atop a Bridge.................. 49 r Shop Methods.......... Capitol Gavel Maker.. ae eet eee cer | Better Shop Methods .. POPULAR SCIENCE MONTHLY Issued monthly. Single copy, 25 cents. matter Dec. Yearly subscription to United States, its —., and Canada, $2. 50; foreign countries, $3. Entered as second-class 1918, at the Post Office at New York under the act of March 3, 1879; B+ ead entry as second-class matter at Chicago, Illinois. Entered resident and Treasurer; this magazine must not be reprinted without permission. In presenting in its editorial columns numerous stories of new products of applied science, POUPCLAR SCIENCE MONTHLY does not underwrite the business methods of the individuals or concerns producing them. The use of PorpULAR SCIENCE MONTHLY articles, or as second-class matter at the Post Office Department, Canada. Printed in U.S. A, Se from them for stock-selling schemes is never Bg ag O. B. Capen, Copyright 1926, by the Popular Science Publishing Co., Inc. The contents of R. C. Wilson, Vice-President; . Cole, Secretary.

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i] oa POPULAR SCIENCE MONTHLY perate your present radio set nm Balkite Trickle Charger Converts any 6-volt “A” battery of 30 ampere hours ot more into an automatic “A” power unit that fur- nishes “A” current from the light socket. With 4-volt and smaller 6-volt batteries may be used as an intermittent charger. Or as a trickle char- ger if a resistance is added to cut down the charging rate, $10. West of Rockies, $10.50. In Canada, $15. Balkite Battery Charger The popular rapid charger for 6-volt “A” batteries. Noiseless, Can be used while the set is in operation. Spe- cial model for 25-40 cycles, $19.50. West of Rockies, $20, In Canada, $27.50. Balkite ‘‘B”’ Eliminates ‘“B”’ batteries and supplies plate current from the light socket. Keeps the B” circuit always at full power. For sets of 6 tubes and less, $35. In Canada, $49.50. Balkite ‘‘B”’ II Will serve any standard set. Capacity 20 milliamperes at 135 volts. Especially adapted to sets of 6 tubes or more, $55. In Canada, $75. with Balkite“B’and a Balkite Trickle Charger ) Sole Licensees in the United Kingdom: Messrs. Radio from the light socket The radio set you now own will operate from the light socket. No changes are necessary. You need only add Balkite “B” and a Balkite Trickle Charger. Balkite “B”—the noiseless “B” power supply— replaces your “B” batteries entirely and supplies plate current from the light socket. The Balkite Trickle Charger keeps your “A” battery always at full charge, also from the light socket. If you like you may also purchase from your dealer an automatic switch that cuts out the charger and turns on Bal- kite “B” when you turn on the set. This type of installation is the last word in radio convenience and ease of operation. You never have to operate your set on a weak pow- er supply or worry about replacing FAN Steel Ba or recharging batteries. One tura of the switch and you have fuli,even power,exactly as required bythe set. And because you always have full power you secure a quality of re- ception possible in no other way. Both Balkite““B” and the Balkite Trickle Charger are entirely noise- less. Their first cost is the last. Both are permanent pieces of equipment with no bulbs, nothing to replace, break or get out of order. There is no further expense other than a negligible amount of household current. Thousands of radio owners have already made this simple addition to their sets. You can make it too, and convert your set into a light socket receiver. Ask your dealer about it today. kite ° “Radio Power Units MANUFACTURED BY FANSTEEL PRODUCTS COMPANY, INC., NORTH CHICAGO, ILL. Accessories Ltd., 9°13 Hythe Rd., Willesden, London, N. W. 10 © This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6. =

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POPULAR SCIENCE MONTHLY NEED A SELF-STARTER? Do You Know the Way, and How to Get Started? Success Here is How Some People Found Out Every MAN wants to be successful; not every man is. Very often, it is the lack of a start that keeps a man back —the knowledge of HOW to get ahead. We all read stories of how men have succeeded, but many of these discourage rather than help us. It seems as if these men have so much greater ability, so many more opportunities than we have. We don’t stop to think of how they improved that ability, and how they learned to grasp those opportuni- Here is the story of a man who started his engine and made his car GO! Contest Editor: The advertisement of the International Correspondence Schools in the March issue of POPULAR SCIENCE brought to my mind a very good example of how much these schools can do for a man who has not had the advantages of higher education. This man that I write of had not even had a high school education and he held a position where he really needed more advanced train- ties. Obstacles are in every man’s way—it’s the man who learns to step over them that wins. Your obstacle may be lack of specialized knowledge in your own field of work. Then you will be interested in this very definite letter that tells how one man learned “how.” It brought Mrs. A. Lundeen of Forest Lake, Min- nesota, the first prize of $50 in Popular SCIENCE MONTHLY’S con- test, last month. +100 in Cash Prizes For the best letter in answer to the questions: What advertisement in ing. Realizing his deficiencies, he en- rolled in a course of Business Manage- ment and studied diligently. The results of this course showed almost from the start and it was not long before he began to advance up the ladder. His promotions were'rapid until now—only about ten years after his enrollment—he is President and General Manager of that same firm with which he started in a lowly position. He has also held the Mayor’s chair in his home city. Surely a wonderful result of their training. CLARENCE M. Minott, the MONEY-MAKING Bangor, Maine Contest Editor: OPPORTUNITIES Presid 1 d Among the numerous graduates of SECTION interests you resident, General Manager, an the Coyne Electrical School, I think my friend and relative is the one most satisfied. Here is the reason. Before taking the course he was receiving $35 a week. Now he is receiving $700 a month, or an increase of 500 per cent. This raise in salary took place during the last four years and will very likely keep on for most—and why? we will pay $100 in cash prizes. For full details— See Page 116 Mayor—these are surely titles that are in the back of every ambitious mind. This man wasn’t content to leave them there, though, but found the road to realization. For the letter describing his ascent was awarded the second prize of $25. To help its readers find their some time. Under those conditions, most anyone would be satisfied. Mrs. A, LUNDEEN Your road to success may be along a different route than this man’s, but the Money-Making Opportunities Section of PopuLar SciENCE MontTuLy offers sugges- tions for 83 different ways. And it is finding the way, and getting started, that counts. Aims and ambitions are fine things to possess; they are as essential to you as the engine is toa car. The thing to be sure of, however, is that your ambitions are not deteriorating into mere wishes (the upholstery of the car, that is comfortable but doesn’t get you anywhere). “roads,” PopuLtaAR SCIENCE has grouped together all the advertisements that offer sug- gestions, in a Money-Making Opportunities Section that you will find on pages 116 to 142 of this issue. Advertisements of courses of training, residence schools, technical books, sales agencies, patent attorneys, and advertisements of a similar nature will be found there. It may be that, a year from now, this section will bring to your mind thoughts similar to Mr. Herdt- felder’s. Here is his letter that won him the third prize of $10 in last month’s contest. Continued on page 116 83 Short Cuts to Success SEE PAGES 116-142

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POPULAR SCIENCE MONTHLY Radiotron UX-199 Radiotron UV-199 the same tube but with dry cell tube for both de- the new standard base. tection and amplification. nd } 1ce i i my for ool ere in- en- ge- ~ ved 1 I : 10t the 1til : his ral ich 1as ; : oy. me * ‘ - ‘ ae T'S the special filament of an RCA Radiotron UV-199 (or UX-199) that . makes it cost so little to run. This tube draws so little current that for a ' limited time it can even be operated from flashlight batteries—for your port- F able sets! It never needs more than inexpensive dry batteries—and it uses ws them up slowly. UUs The thoriated filament of this tube is specially treated, so that there is always 7 a layer of thorium a single atom deep on the filament-surface. And electrons a leap from the thorium at a stupendous rate—-conveying the music and the aS speech, ' Because this type of filament gives off more’ electrons at less heat—it lasts longer, and it uses less battery current. And because this type of filament - was developed in the great research laboratories that contribute to RCA, 5 . . . . ‘ y on you will find it in every genuine RCA Radiotron UV-199 and UX-199. te. Another good reason for being careful to find the RCA mark on the base Is, | when you buy! ys, IS) nd . RADIO CORPORATION OF AMERICA ill New York Chicago San Francisco It- ze M A D°E ner geueaee Tau § eee a MAK EB R-S G:F R°A-D FOL Ac8 © This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6.

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A battery eliminator is here under- 200 : The apparatus shown permits an accurate determination of its characteristics. Actual curves show- 160 + ing the hum intensity are obtainable going test. If It Passes These Tests, It Is Worth Buying POPULAR SCIENCE MONTHLY May, 1925 120 “DP, OUTPUT, VOLTS D.C 3 3 ° 5 10 15 OPERATING CHARACTERISTICS B BATTERY ELIMINATOR SUPPLY-112 VOLTS 60 CYCLE A.c. AVERAGE POWER CONSUMPTION-I5 WATTS. ey S + . 8 HUM INTENSITY Volts of A-C. Component of Output no 9° °o 7 + pi L100 sh tod REC LSS RS ee 050 23.30 35 40 45 +«50 55 60 65 70 75 LOAD, MILLIAMPERES Are You Buying A B-Battery Eliminator? we have received at the Institute on the subject, there is more in- terest in—and more doubt about—battery eliminators than any other type of radio equipment on the market. An efficient eliminator is, without question, a worth-while addition to a radio outfit. A poor eliminator will ruin an otherwise satisfactory outfit. And that a large proportion of the elimi- nators on the market are inferior is proved by the fact that the Popular Science Institute of Standards has had to dis- approve after test more products under this classification than any other. The “hum” and other objectionable features that are found in so many elimi- nators are not to be found in the elimina- tors approved by the Institute. Following are the characteristics that a B eliminator must possess to merit the approval of the Institute: 1. Sufficient capacity, so that it may maintain its output d. c. voltage at its rated value when used with standard receiving set using five or more tubes. 2. Reasonably good inherent “voltage regulation” or a manual control of “out- put voltage,” for voltage adjustment. 3. The rectifying element must give a reasonably long, useful service. 4. The construction must be such as to insure continuous operation with | heoreaty by the hundreds of letters By ALEXANDER SENAUKE, E. FE. Radio Engineer, Popular Science Institute of Standards freedom from breakdown, fire hazard, or electric shock. 5. The filter éffectiveness must be sufficient to make its operation, when © POPULAR SCIENCE Monthly Guarantee The above seal on an advertise- ment indicates that the products referred to have been approved after test by the Popular Science Institute of Standards. POPULAR SCIENCE MONTHLY guarantees every article of mer- chandise advertised in its col- umns. Readers who buy prod- ucts advertised in POPULAR SCIENCE MONTHLY may expect them to give absolute satisfac- tion under normal and proper use. Our readers in buying these products are guaranteed this satisfaction by POPULAR SCIENCE MONTHLY. THE PUBLISHERS. properly installed, free from disturbing hum or other line noise. Eliminators that are submitted for test to the Institute are tested by specially devised test methods to check their con- formance to these five characteristics. Characteristic No. 5 is a major prerequi- site for all battery eliminators. In testing the “filter effectiveness of B_ battery eliminators,”” in the radio laboratory of the Institute, the various conditions of operation are simulated by variable resistors and measuring instruments. For each condition, the “alternating” or “hum producing’ component of the output of the eliminator is separated and impressed upon a special, calibrated amplifier and vacuum tube voltmeter device that amplifies this alternating component to an even greater extent than it is normally amplified in a re- ceiving set, and permits of its being measured on an electrical meter. The reading of this meter, therefore, gives a quantitative indication of the amount of “hum” that the eliminator will pro- duce when used to operate a receiver. Readers who are planning to buy a B eliminator will undoubtedly be in- terested in the list of approved radio and tool products that can be obtained free of charge by writing the Popular Science Institute, 250 Fourth avenue, New York City.

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IS] This seal on a radio or tool advertisement signifies the approval oF the INSTITUIE OF SIANDARDS. ee pase ve May, 1926 POPULAR SCIENCE MONTHLY 7 (= ce Confidence in that uninterrupted service you expect from your radio means belief that there is unusual quality behind the dials—in design, in materials, in workmanship. At-AmeRIcAN furnishes many guarantees of such quality. But the best of guarantees, for an experienced buyer, is the knowledge that a noted organization of specialists in fine radio, equipped with every facility for creating ex- cellence, stands sponsor for the product. All-American Model R: a five-tube ris! tuned-radio-frequency toroid receiver, Rauland-Lyric-equipped. Price $90 (West of the Rocky Mountains $95) The leading wholesaler of radio apparatus in your community has probably been for years an ALL-AMERICAN Authorized Distributor. ALL-AMERICAN Guaranteed Radio Products are sold everywhere by responsible and reliable dealers. ALL-AMERICAN RADIO CORPORATION Pioneers in the Industry E. N. Rauland, Pres. Belmont, Tripp and Kenosha Avenues, Chicago, U. S. A. The Laboratory ok A mewmae es : Bord . OWNING AND OPERATING STATION WENR—-266 METERS Co Built for the Years to Come © This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6,

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“IT usep to think that because the Eveready ‘B’ Battery No. 772 cost less than either of the larger Heavy Duty Evereadys that I was saving money. As a matter of fact, on four or five tube sets, that was false economy. “The right size Eveready ‘B’ Bat- teries to use depends on the number of tubes in your set. The life of the bat- teries depends on how much you listen in and on’ whether a ‘C’ battery is employed.” To get the maximum of “B” battery life and satisfaction, follow these simple rules: On 1 to 3 tubes—Use Eveready No. 772. On 4 or more tubes — Use the Heavy Duty “B” Batteries, either No. 770, or the even longer-lived Eveready Layerbilt No. 486. On all but single tube sets—Use a “C” battery*. POPULAR SCIENCE MONTHLY “The little wrinkle that makes my ‘B’ batteries last longer 1s using the right size Evereadys with a‘C battery” Follow these rules, and No. 772, on 1 to 3 tube sets, will last a year or more; Heavy Duties, on sets of 4 or more tubes, eight months or longer. The average year-round use of a set is two hours a day. If you listen longer, © Lert — No. 486, for 4, 5 or more tubes. $5.50. Ricut—Ever- eady Dry Cell Radio“ A’’ Bat- tery, 1% volts. Radio Batteries -they last longer © This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6. May, 19% your “B” batteries will have a some- what shorter life. If you listen less, they will last longer. Our new booklet, “Choosing and Using the Right Radio Batteries,” is free for the asking. It also tells about the proper battery equipment for the new power tubes. *Note: In addition to the increased life which an Eveready “‘C’’ Battery gives to your ‘‘B’’ batteries, it will add a quality of reception unobtainable with- out it. Manufactured and guaranteed by NATIONAL CARBON CO., Inc. New York San Francisco Canadian National Carbon Co., Limited , Toronto, Ontario ——T Tuesday night means Eveready Hour— 9 P.M., Eastern Standard Time, through the following stations: wEAF-New York wor-Buffalo won-Chicago wyaRr—Providence wcar-—Pittsburgh woc-Davenport WwEEI—Boston wsat—Cincinnati Minneap. wtac-Worcester wrar—Cleveland W°°°| St, Paul wrFi—Philadelphia wwj-Detroit xsp-St, Louts May, th th

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~~ Fe OS Our 54TH issue; not a bad age—for a man or a magazine. And yet at 54, birthdays have a way of following each other so closely that one is apt to slip by unremembered. So it might have been with us this year, but for Edward §. Pattison, student of engineering at Rensselaer Poly- technic Institute, Troy, N. Y. From Mr. Pattison, born thirty-odd years after Poputar Science MonTuLy, came a note of appreciation of the help the pages of this magazine have given him in selecting his life- work. With the note came a copy Pisces ScrencE Montuty is 54 years old with this of Poputar Science MonTHiy . Ze oaks for May, 1872, the first issue ever published. The magazine had been in the family library more than half a century. Those today who are making Poputar Science Montuty had nothing to do with the magazine of 1872. Most of us were yet unborn. But Mr. Pattison’s letter, and others like it, prove to us that our trail has been straight; our progress true. In that first issue of ours, Edward Livingston Youmans, the blind genius and founder of Poputar SciENCE Montuty, wrote of its purpose: “Science is not the mystery of a class, but the common interest of tational beings, in whom think- ing determines action. “It is this immense extension of the conception of science, in which all the higher subjects of human interest are now included, that gives it an everlasting claim on the attention of the public. Besides its indispensable use in all avocations, and its constant application in the sphere of daily life, it is also profoundly affecting the whole circle of questions, speculative and practical, which have agitated the minds of men for generations. “Whoever cares to know whither inquiry is tending, or how opinion is changing, what old ideas are perishing, and what new ones are rising into acceptance—briefly, Whoever desires to be intelligent as to contemporary movements in the world of thought, must give attention to the course of scientific inquiry. “Believing that there are many such in this country, the Poputar Scrence Montuty has been commenced with the intention of meeting their wants more perfectly than In May, 1872, Edward Livingston Youmans, the blind genius who founded PorpuLtarR ScrENCE MonrTHy, published the first issue of this magazine, a reproduction of which is presented above POPULAR SCIENCE MONTHLY AM EDITORIAL BIRTHDAY any other periodical they can get. Poputar SciENcE Monta ty will make its appeal not to the illiterate but to the generally educated classes. Our pages will be adapted to the wants of these and will enable them to carry on the work of self-instruction in science.”’ Year after year those policies have guided the editors of Poputar Science Montuty. That old purpose is in the planning of every issue. And instead of the few hundred readers of 1872, we now have hundreds of thousands in every part of the world. Ba Poputar Science Montuty is conducted today just as it was fifty-four years ago, but the fields of science and the interests of man- kind te seen to be far wider than even Mr. Youmaus dreamed of half a century ago. From thousands of laboratories and factories and shops have come inventions and dis- coveries to make the daily life of human beings easier, richer, happier. And to keep pace with this tremendous progress, Poputar Science Mon tuty has been en- larged and improved. Where one man once made the maga- zine, it now needs many. A large board of editors and con- sulting scientists, our own labo- ratories and testing divisions, and an extensive research de- partment, all contribute to the services offered our readers. T IS the function of Porputar ScreNcE MonTHLY to report and interpret great advances to explain just how they affect you and me. Pictures have been added to make vivid the tre- mendous drama of science and its effect on civilization and the lives of men. And that we may be of service to the largest | pane number of people, we have reduced the news of science to words that any intelligent person can understand without effort. We have forced those exclusive folk—the scientists—to share the knowledge, once shared only with each other, with all of us. On this our fifty-fourth birthday we have reason to be proud of no one accomplishment more than that the high priesthood of science is no more. Science has been Our Founder and His First Issue made graphic, understandable and interesting to the aver- age man and woman. founder.—S. N. B. We have kept the faith of our

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POPULAR SCIENCE MONTHLY ees Why the Flexible Unit Control Grebe es Binocular Coils ® 7 Reg. U.S. Pat. Of. and Low-wave Extension Circuits Usual eh +! Dial sy ’ Grebe ‘ ‘Colortone” All Grebe apparatus is covered by patents granted and pending. Synchrophase. The Grebe Synchrophase, built to satisfy the “fan’’, has quickly won first place in Synchrophase Appeals to the “Fan” Hi... than any oneelse, understands What Grebe quality means. He best realizes why Grebe construction is reflected so Surely in the superior reception of the * the opinion of the average radio user. Ask your dealer to show you what Grebe reception means. A. H. Grebe & Co., Inc., 109 West 57th St., New York Richmond Hill; New York Factory: Western Branch: 443 So. San Pedro St., Los Angeles, Cal. Ty @epe HINOPTASS, / Sa MARK REG. U.S. PAT. OFF. 4G} Why BW, MARK REG.US.PAT.OFF. This Company owns and operates stations WAHGand WBOQ; also low-wave re- broadcasting statiens, mobile WGMU and marine WRMU. It is written: “‘“A perfect vase never came from a bad potter’s wheel.”’ When one realizes its origin, the superior re- ception of the Synchro- phase is not to be won- dered at. May, 19% IS} This seal on a Radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6-

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POPULAR SCIENCE MONTHLY SUMNER N. BLOSSOM, Editor May, 1926 An Untold Story of The Greatest Sea Rescue With the life-saving apparatus helpless against the fury of an angry ocean, the Roosevelt's engineers invented ingenious devices to save the stricken crew of the sinking Antinoe By Epcar C. WHEELER frozen and starving sea- men clung desperately to the storm-swept deck of the sink- ing tramp steamer Antinoe. Boats were gone; engines and fires were flooded; and the lee rail was dip- ping under. Numbed hands grasped for hold against mid- Atlantic, gale-driven combers that surged up angrily to lap them into the sea. Voices that tried to shout were lost in the howl of winds and driving sleet. Two hundred yards away was the dim outline of a ship. For three days now, the United States liner, President Roosevelt, had stood by. For three days the rescuers had tried every re- souree known to mariners in frantic efforts to reach them. To the huddled group on the derelict, it seemed as if the full wrath of the “ Roaring Forties” must surely carry them to death. Suddenly, above the storm, came the faint booming of a gun. A thin rope slapped down across the careening deck. The stricken seamen seized it eager- ly, with new strength. Together they tugged at it. As they pulled, an empty lifeboat, at the end of the line, moved slowly toward them across the foaming sea. Now it was 100 feet away; T ENTY-FIVE half chapter which until now has remained virtually untold. It is a story of ingenuity and resource- fulness seldom equaled; of men trained to do things and make things with their own hands, who in a few tense hours became in- ventors and mechanical geniuses to meet a great emergency. Its heroes were below-deck heroes— stout-hearted engineers, machin- ists and firemen, begrimed with the oil and grease of machinery, who labored hour after hour in the din of the straining engines to make the rescue possible. _— Captain Fried ma- neuvered his ship perilous- ly close to the foundered Antinoe, jockeying for positions of van- tage, it was the sure hands cf engineers on the throttles down below that sent the Roosevelt plunging forward at his bidding, or pulled it up sharply on its haunches. In those four days of maneuvering, they responded to more bells from the bridge than ordinarily are sounded in two years in and out of port. While heroes above were risk- ing and losing their lives in futile attempts to launch their life- boats, the hands below were skilfully putting thousands of horsepower through one of the now only twenty feet. A little more, and the boat’s stout paint- er, towhich the thin linewas made fast, would be within their reach. One final frantic tug, then . . . The rope fell slack in their hands, The line had parted. Everyone knows what happened then; how, a few hours later, the entire crew of the Antinoe finally was taken off in boats manned by heroes of the Roosevelt's crew. The whole world was stirred by this mag- nificent rescue, and two continents vied in honoring Captain Fried and his men Faced by Emergency, He Became an Inventor John Turner, chief engineer of the United States liner President Roosevelt, who met one of many emergencies in the thrilling rescue of the Antinoe’s crew by inventing what has proved to be an important improvement in apparatus for saving lives at sea for their victory in that grim four-day battle with a thundering tempest. But behind the shooting of that one life line after a dozen other attempts had failed—even while it brought only heart- rending disappointment—lies a remark- able chapter in the story of the rescue, a most terrific tests that marine engines ever have been called upon to meet. Time and again, turbines, whirling 1800 revolu- tions a minute, were thrown from full speed ahead to full speed astern. Yet never once were the great engines allowed to falter. Again, when the first shot lines from the Lyle life-saving gun snapped in mid-air, and the supply of projectiles was ex- hausted, it was the engineers who turned to the machine shop and there fashioned new projectiles from rough steel. il

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And finally, when these shots failed like the others, it was the chief engineer, John Turner, who met the emergency with a simple but effec- tive invention, inspired by the necessity of the moment. At the very first trial, the improved projectile which he de- vised carried the life line squarely across the deck of the Antinoe and a quarter of a mile beyond. How this line, when hitched to an empty life- hoat, severed across the icy rail of the Antinoe, already has been told. Yet even though it did not lead directly to the saving of lives, the great fact re- mains that in the most critical moment in one of the most thrilling of all sea rescues there was invented an important improvement in apparatus for saving lives at sea— the inspired idea of a handy- man. And the President Roosevelt's chief en- gineer is just that—a handyman. A slightly built, soft-spoken, reticent man of 37 vears, he has been making things with tools and machines ever since he was fifteen, an apprentice in a machine shop. S A boy, his greatest pleasure in spare hours was to build toy steamships with real toy engines, and make them run. As a man, aboard ship, his hobby has been the making of handy devices— among them such things as an ingenious wave-driven pump that automatically bales a small boat at anchor; a quick- heating kettle that boils the morning coffee in a minute; a centrifugal machine gun driven by a gas engine; a device for measuring the distance of airplanes with beams of light. And, with all, he is a master engineer, trained in an English university, and in the rougher school of experience. During the World War he made ninety-six trips through the submarine zone. Many times POPULAR SCIENCE MONTHLY Below-Deck Heroes At the left, First Assist- ant Engineer Ganly mak- ing new projectiles for the Lyle gun in the Roosevelt machine shop as he did while the sea waited for its victims. Second Engineer O’- Toole stands by, ready to attach the wire spring Two Simple Changes That Improved a Noted Invention Above, the Lyle gun, loaded with the emergency-born projectile, ready to be fired. Below, the new projectile, showing original eighteen-inch spin- dle (marked by dotted circle) lengthened to four feet, with Turner’s spring * his resourcefulness and inventive ability have been put to the test. Once, for example, when the sixteen- inch piston of the President Roosevelt's steering engine broke, he quickly im- provised a new piston from the lifting gear for a high pressure turbine. At another time, on the steamer Philadel phia, a broken main crankshaft found him not at all at a loss. He simply divided the power plant in half, and drove his ship with half a crankshaft, with two engines instead of the four. May, 19% man who during the war had charge of installing engines on twenty-five Amer. ican torpedo boats; James O'Toole, senior second; Joseph Dluzon, junior second: and Bernard Duffy, third—all of then skilled engineers and expert machinists as well. These were the men Captain Fried counted on to carry through when, that Sunday morning in January, he received the S OS of the Antinoe and summoned his chief engineer to the bridge, Through driving hail and snow the Roosevelt was laboring, Heavy seas were dashing foam across her decks. The pros. pect of a rescue in such a storm was enough to dishearten even the bravest of men. vs WE ARE going to her,” Captain Fried told his engineer. “We'll want all the speed we can get, and we'll need all hands on duty.” Down below went out orders for double watch. Sleeping men tumbled from their bunks and hurried down steep iron stairways winding into the en- gine room, twenty feet below the water line. Yellow jets of flaming oil spat and _ roared under the boilers, throttles were opened wide, and _ the President Roosevelt, guided by radio compass, churned to the rescue with all the power that was in her. At noon the Antinoe was sighted. The Roosevelt stood by to the windward, while ballast pumps poured oil on the foaming waters. Two hours later the Lyle gun, de- vised for just such a rescue, was made ready on deck to fire the first shot line to the Antinoe. This little mortar, about a yard long, points its two and one half inch muzzle sharply upward. The entire gun is sta- tionary on the deck, so that it is necessary to aim the ship instead of the weapon. Its projectile is a steel bullet a foot long, into one end of which is fastened a slender steel rod or spindle. This spindle ends in a wide eye in which is fastened the end of a manila rope, about the thickness of an His four assist- ant engineers on the Roosevelt are men of much the same caliber: James Ganly, first assistant, a young Made Rescue Possible The engine room of the Roosevelt show- ing dials flashing or- ders from the bridge during the thrilling rescue. At the ex- treme left Third Engineer Duffy is seen relaying the or- ders to the fire room. At the wheels are Ganly and O’Toole

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ige. OW ing. am rOS- rm ven was hile on wo de- ule, first yng, zile sta- ary ON. ng, der sin 1 of an May, 1926 POPULAR SCIENCE MONTHLY 13 ordinary clothesline, coiled in a large bucket at the side of the gun. The pro- jectile is inserted in the gun with the spindle and line protruding from the muzzle. A charge of powder set off by a primer fires it. And now, while searching eyes on the bridge peered through the dark curtain of sleet, seeking aim at the half obscured mark, the engineers below were respond- ing to bells which kept sound- ing in quick succession as the tossing ship maneuvered into position. With gaze fixed on the dials that indicated orders tele- graphed from above, and with hands clutching the engine con- trol wheels, they moved with clocklike precision to the com- mands of pointers that told them: “slow ’’—‘‘full ahead *"—* stop” —“reverse.” HE little gun boomed. But as the projectile sped from the muzzle, it left the rope behind! The quick, lashing jerk of the The Final Scene in the World’s Most Thrilling Sea Rescue In this drawing, our artist has graphically shown the approach of the Roosevelt’s lifeboat to the doomed Antinoe to take off the remaining thirteen of her crew. The picture was made from descriptions of passengers and the crews of both ships. The Antinoe had listed to an angle of forty-five degrees, and its crew were huddled about the foremast Captain Fried of the President the ship’s machine shop, just off the engine room. There, from a stock of steel bars, he selected one of the cor- rect diameter and cut it to length for — Roosevelt, who directed the fa- mous rescue of the British crew a twelve-inch bullet. For the spindle he hour the job was entirely completed. turned down a length of boring bar, Through the night and the next morn- threaded it at one end, and inserted it ing, while the Roosevelt drifted about in in a threaded hole bored in the projectile. search of the Antinoe, which had been On the other end of the spindle he welded lost in the darkness, the engineers worked an eye. In the short space of half an without rest by turns in the machine shop, making projectiles. When New Life-Saving Method the stock of two-and-one-half- Drawing shows kite and breeches inch bars was exhausted, buoy combination recently proposed they took three-inch stuff - 7 ye meee at and turned it down to the KITE the Naval Consulting Board for : oleae , SIT ae es ee right thickness. In all, they ee eee 2S hEAVY R bullet had snapped the rope like so much thread! A second shot, then a third, met with like failure. “All three projectiles gone,’’ was the word passed down from the deck, “We'll make some more,” the chief engineer flashed back. ‘A few quick measure- ments, and he hurried into MAN IN : BREECHES BUOY manufactured thirteen of the **homemade’’ projectiles. Meanwhile, other mechanics from the engine room had turned electricians and were. stringing thousand-candle- power lights around the sides of the Pres7- dent Roosevelt, making a 100-foot circle of daylight brightness about the ship. On the third day, after two oi the Roose- velt's men had been swept away in a fu- tile attempt to launch a lifeboat, the men on deck renewed their efforts to shoot a line across. Ten more shots were fired—and every one of them (Continued on page 114)

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POPULAR SCIENCE MONTHLY OHN and Mary Newlywed have decided it is time to get their garden started. So, taking advantage of the fine weather, they have begun enthusiastically, if not skilfully, to prepare the ground. RE YOU quick at observing things A around you? Are youalwayson the alert to see that everything is done right? Here is an opportunity to prove that you really are, and in so doing to win one of the cash prizes PopuLaR ScIENCE MonTHuLty is offering in its fas- cinating series of Picture Contests. The contests began in the March num- ber, but you can start now. Each contest is a separate competition and complete in itself. It is not necessary for anyone to May, 19% hat’s Wrong in This Picture? ~ $1,000 CASH PRIZES have entered the preceding competition. The idea is this: In each issue you will find a picture in which John and Mary Newlywed are the principal characters in a little home comedy. John and Mary are inexperienced, but that does not deter them from undertaking odd jobs around the house. Naturally, like everyone else, they have to learn by mistakes. And they make many. In addition, for good meas- ure, the artist draws a number of things in each picture incorrectly. Your task is - Are they going about it right, or are they bungling the job? If they are making mistakes, what are they? The artist, too, deliber- ately made a few errors in drawing the picture. Find them, also to find all mistakes made either by the Newlyweds or by the artist. Cash prizes amounting to $1,000 will be awarded to those who point out the greatest number of errors in this month's picture and who also give their reasons in the clearest and cleverest way. The prizes are sixty-three in number, so you have that many chances of winning. The contest is open to everyone, and you can submit as many sets of answers as you wish. If you already have won 4 May, priz Mo: you ent | cont case B pict read fully clos thot an € men and they thin or 0

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% | May, 1926 prize in one of PopuLar SCIENCE MonTHLY's preceding contests, vou still may compete in the pres- ent one. Prizes for each month's contest will be announced in every case as Soon as possible. Before you begin to study the icture this month, be sure to read the rules of the contest care- fully. Then examine the picture closely, going over every detail thoughtfully. As you come upon an error, make a note of it. Ask members of your family, friends, and neighbors to tell you what they consider wrong in it. If you think you lack knowledge on one or more points, consult someone who is experienced. When at length you can find no more mistakes, make out a list of all you have found and give your reasons for calling them wrong. Remember to number your an- swers. Use pen and ink or type- writer, and write on only one side of the paper. Address your entry to the Picture SCIENCE MontH_y, 250 Fourth avenue, New York City. All answers for this month’s con- test must be mailed not later than May 30. If you wish to submit additional an- Contest Editor, PoruLar POPULAR SCIENCE MONTHLY Here Is the List of Prizes Will You Win One ? OPULAR SCIENCE MONTHLY is awarding $1,000 in sixty-three cash prizes for the best answers submitted in this remarkable Picture Contest. The cash prizes will be distributed as follows: Pivet Prige............. $ 500 Second Prize........... 100 ‘Tied Prize. .......:... 50 10 Prizes, $10 each..... 100 50 Prizes, $5 each...... 250 Total Prizes........ .$1,000 swers, you may do so, but send them in as complete separate entries. Where more than one set of answers is entered, the judges will consider each set as a separate entry complete in itself. The three judges who decide on the winners are Professor Collins P. Bliss, 15 director of the Popular Science Institute of Standards and head of the department of mechanical engineering, New York Univer- sity; Dr. Hazen G. Tyler, associate director of the Popular Science Institute of Standards and asso- ciate professor in experimental engineering, New York Univer- sity;and Alexander Senauke,M.E., E.E., radio engineer of the Pop- ular Science Institute of Stand- ards. Their decisions will be final in all cases. The first two Picture Contests in our new series have evoked great enthusiasm among our read- ers, judging by the expressions we have received from thousands of them. We were practically del- uged with the flood of contribu- tions for the first contest. And already we have had a legion of entries for the April contest. In next month’s issue, another picture will appear, fully as curiosity- provoking as this month’s. If you failed before, don’t be discouraged. You may score heavily in this one. But whatever your success, you will gain a fund of prac- tical knowledge from John and Mary Newlywed’s mistakes that will repay you. The Rules of the Contest—Follow Them Carefully 1 Each month, until further notice, ¢ POPULAR SCIENCE MONTHLY is printing a picture of John and Mary Newlywed doing some simple job about the home. Each picture shows John or Mary, or both, doing one or more things in the wrong way. In addition, there are a number of deliberate mistakes by the artist in drawing the picture. You are to tell us what things are being done wrong and what things are drawn wrong in each picture, and why they are 4 Answers to each picture must be ¢ mailed or delivered to the offices of POPULAR SCIENCE MONTHLY not later than the thirtieth ofthe month following the date of publication of the magazine in which the picture appears. Thus, to insure consideration in this month’s contest, answers to the pic- ture in this month’s issue, published April 10, must be mailed or delivered changes or corrections will be allowed in any entry after submission, but any contestant may submit as many sep- arate entries as he desires. All entries should be addressed to ¢ the Picture Contest Editor, POPU- LAR SCIENCE MONTHLY, 250 Fourth avenue, New York City. Name and address of the entrant must be written plainly on each page of the entry. Entries with insuffi- cient postage will not be wrong. POPULAR SCIENCE $1,000 each month in sixty- three cash prizes for the best answers giving the greates number of mistakes in the picture. These prizes will be distributed as follows: * MONTHLY will award T First Prize.......... $500 Second Prize........ 100 Dhird Prize......... 50 Next 10 Prizes, $10 MMR ee oc asco 5 100 Next 50 Prizes,$5each 250 Total Cash Prizes ——— each month...... $1,000 Another Contest in June E fourth $1,000 Picture Contest of this fascinating series will appear in next month’s issue. Watch for it. Other similar contests will appear in succeeding issues of POPULAR SCIENCE MONTHLY. Each will be a complete contest in itself. So, if you should fail to win a prize in one month’s contest, you still have as good a chance as any one else to win one the next month. accepted. The publishers cannot be responsible for delay, loss, or non-delivery of entries. No contribution entered in this contest will be acknowledged and none will be returned. No letters of inquiry regarding points covered in the rules can be answered. You pay nothing. Just * prove your knowledge and observation. You need not buy POPULAR SCIENCE MONTHLY to compete. You can borrow a copy from a friend or you can examine oneatany officeof POPULAR SCIENCE MONTHLY or at public libraries free of Prizes will be award- *ed to those persons who point out the largest number of actual mistakes found in the picture and who present their explana- tions of the errors in the clearest and most skilful way. Actual mistakes shall be construed in all cases to mean mistakes appearing in the picture about which there can be no question in the opinion of the judges. In case of ties, the full amount of the prize will be given to each tying contestant. not later than May 30. No entry bearing a postmarked date later than the closing date for entry will be considered. 5 Answers may be submitted on any * kind of paper, but they must be typewritten or written in ink, and on one side of the paper only. Each error must be listed separately and numbered. No charge. Each contest is open to everybody, except employees of POPULAR SCIENCE MONTHLY and the Popular Science Institute of Standards and their fam- ilies. 8 Officials of the Popular Science ¢ Institute of Standards will act as judges and their decisions will be final. Acceptance of these rules is an implied condition of each entry.

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16 HERE is such a thing as a typical American. Dr. Ales UHrdlicka, noted anthropologist of the Smithsonian Institution, says he has found him. Almost since the Pilgrims landed, we have been in doubt on the subject. We could reach down in the melting pot that is the United States and draw out almost any type—a broad-shouldered Briton, an olive-skinned Italian, a round-faced Ar- menian, all Americans by birth and breed- ing. To say which best represented America was a puzzle. But now after fourteen years of careful measurements and examinations, a scien- tist says that, although our history is short, there has been time for all the different types to fuse. Out of them all, he finds, is emerging a new type of man, distinct from those of all other lands. Within 200 years, he believes, this type will be clearly developed into a charac- teristic American race distinguished by its virility and energy. Even now, if you were on a street Washington, POPULAR SCIENCE MONTHLY The American type, Dr. Hrdlicka finds, is the tallest of all larger groups of white people. In physical and men- tal fitness he has not suffered by the flood of immigration crowded with peoples of every nation and a certain type of man came along, you would say involunta- rily, “That’s an American.” Certain things in the way he looked and acted would cause you to'recognize him. According to Dr. Hrdlicka, one of these characteristics is height. The typical American is the tallest of all groups of white people. In the wide spaces of a new country, he has had room to grow. His average height is about five feet, nine inches. The typical American is naturally slender. In comfortable middle age he may develop an “automobile paunch,” but when a youth he is lithe and sinewy. His legs are long. and they move gracefully. He weighs on the average about 150 pounds. Hair— usually brown and _ straight. Blond or curly-haired Americans stand out in a crowd because of their rarity. A mixture of many bloods shows in his eves. They are light in color, either a hazel, or, if blue, mixed with brown. The head of the typical American is perceptibly larger than those of other nationalities. Facial characteristics dif- fer according to occupation. Some whose ancestors were farmers or laborers, have jaw and cheek bones that are in- clined to protrude, with skin drawn taut over them. Abraham Lincoln is a pro- nounced example of this type. Those with white collar jobs have more rounded features, with bones less prominent. The typical American face is frank, healthy, intelligent, with medium high May, 19% ‘Typical American| Emerges at Last Many Bloods Fused into Distinct New Kind of Man— Tall, Slender, Energetic forehead, rather long nose, ears long and broad, and mouth moderate in width. His arms, hands, and feet are relatively somewhat shorter than those of other nationalities. The chest is about equal in breadth but not quite so deep as in European immigrants. The character of the American is as pronounced as his appearance. “The main characteristics of the American type,” -Dr. Hrdlicka explains, “are, in general, frankness, openness, yet shrewdness, energy and persistence, with little sentimentality or affectation as a general rule, and with relatively few extremes in action.” OTION-PICTURE directors, fol- lowing intuition rather than the measurements of anthropologists, have hit upon virtually the same type to rep- resent America. The hero who usually is picked to represent the good old U. S. A. is exactly the tall, energetic, deter- mined-looking fellow that Dr. Hrdlicka describes. In arriving at his conclusions, Dr. Hrdlicka examined more than 1,500 adults, both men and women. These were descendants of what he calls “Old Amer- icans,”’ that is, the early stock of America. Many Americans have feared lest the strain of American blood has deteriorated through the influx of immigrants. The Washington investigator says that his studies prove the contrary. Even children of immigrants who were undersized or under the standard of mental and physical fitness have developed amid wholesome American surroundings into — sturdy, quick-on-the-mark individuals. May pac rod art wit tin ger Un ist col “ fl mi} we ter jal kit mi

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May; 1926 POPULAR SCIENCE MONTHLY 17 How a Famous Artist Became One of the W orld’s Greatest Inventors He Lived Iwo Great Nired a hun- i\ it | dred years \\ AN ago, as the VA packet ship Sully rode the sea from Havre to New York, a famous American artist sat at dinner with a group of dis- i / tinguished —_ passen- ff, gers, among them the / United States Min- ister to France. The conversation turned to electricity, the new “fluid” the strange mysteries of which were arousing the in- terest of the world. Ben- jamin Franklin and _his kite, Ampere and his ex- periments with the electro- magnet, were mentioned. “T should like to know,” spoke up one of the group, “whether the flow of elec- tricity is retarded by the length of wire.” “Not at all,” replied another of the company, a well-known scholar from Boston. “It is quite established that electricity passes instantaneously over any known length of wire.” And he re- called Franklin’s experiments in which he had observed an instantaneous spark at the end of several miles of wire in a cir- cult. “Well, if that is the case,” chimed in the artist, “if the presence of electricity can be made visible in any part of a cir- cuit, I see no reason why intelligence may Courtesy Western Unton Telegraph Co. The World’s First Telegraph Instrument Morse’s first crude model telegraph receiver. As the elec- tric circuit was opened and closed, an electromagnet caused a pencil to move up and down, making dots and dashes on a ribbon of paper moved by clockwork An Amazing Prophecy Lives By Rosert E. Martin “Well, Captain,”’ said Morse, as the packet ship reached New York, “if you should hear of the telegraph one of these days as the wonder of the world, remember the discovery was made on board the good ship Sully.” This happened about 100 years ago not be transmitted instantaneously by electricity.” No sooner had the words left his lips than Samuel Finley Breese Morse real- ized with an overwhelming thrill that he had hit upon the secret of a tremendous invention. Like a thunderbolt there flashed upon him the revelation of an astounding new marvel of communi- cation, one destined to link the ends of the earth. The significance of his words apparently passed over the heads of his fellow passengers. They went on with their con- versation as if nothing unusual had happened. But Morse was electrified. Abruptly he left the table and went on deck. There, while the waves of mid-ocean spanked the ship’s sides, the instrument that should write down the thoughts of men at a distance took shape in his mind. N AN instant Morse, the great artist, at the age of 41, was transformed almost miraculously into Morse, the great inventor of the tele- graph. In the first hour of that discovery, his idea un- folded before him from _be- ginning to end. His thoughts ran something like this: “A current of electricity will pass along a wire in- stantaneously to any distance. The Inventor of the Telegraph ..Samuel Finley Breese Morse, as he ap- peared shortly before his death at the age of 81. This is a reproduction of a picture of the inventor published in the first issue of Poputar Science Montuiy, May, 1872 If the current is broken anywhere along the wire, a spark appears. The spark will be one sign; its absence another; the time of its absence another. These three signs I will combine to represent figures and letters, words and sentences. If electricity can carry these signs ten miles, I can make it carry them around the world!” E drew from his pocket a little scratch book in which he was accustomed to make sketches, and began to mark down a series of dots and dashes. These he arranged in ten combinations, each representing a numeral, the nu- merals to be combined to represent words. What he wrote was this: 0 0 SO CO 8 OS Or en this: T a DG tae ye | 215 56 15 5 16 252 War Holland Belgium Alliance France England That was the world’s first dot-and-dash language; the first beginning of the Morse code; the beginning of electrical communication which was to lead to the telegraph, the telephone, radio and countless other wonders that have made possible the world we know today. As the ship sped toward America, Morse spent sleepless nights developing

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18 his idea. His mind was on fire. He had little if any technical knowledge of elec- tricity; vet he had been keenly interested in its mysteries ever since the day when, as a young student, he had clasped hands in a circle with other students at Yale College and had felt the tingle of an elec- tric shock pass through his body. In a general way he was familiar with the operation of the battery, the electro- magnet, and other important discoveries in electrical science. OW he took these separate dis- coveries as he found them and worked them over in his mind into a practical system of sign writing at a distance. Instead of an electric spark to produce his dots and dashes at the re- ceiving end of the wire, he would use an electromagnet to move a metal lever up and down as the electric circuit was made and broken. In his scratch book he drew little sketches of the instruments and wires he would use. These he showed: to his fellow passen- POPULAR SCIENCE MONTHLY Then— At right: The instrument which in 1844 received the message flashed by Morse from Wash- ington to Balti- more: ‘* What Hath God Wrought!” —and Now At left: The remarkable automatic typewriter- receiver used today in the 7400-mile circuit be- tween London and San Francisco. On a ribbon of paper the machine prints the message in in- stantaneous response to an operator a distance of thousands of miles away world, Morse little dreamed of the years of struggle, poverty and bitter discourage- ment he must pass before his invention could be put into practical service. Where other inventors have sacrificed all in the struggle to bring an idea to perfection, Morse’s great battle was to **sell” his virtually completed idea to an unbelieving and scoffing public. To this purpose he sacrificed fame and position, already gained in another field, and de- voted a dozen years of heart-breaking labor. The extraordinary thing about Morse is that he was a man who lived two distinct lives, and who climbed from the bottom to success in each of them. In his life as an artists; he began as a strolling *“peddler,” barely keeping clothes on his back and food in his stomach by painting portraits of New England country folk as he wandered from village to village. In less than a score of years, by dogged persistence, he became the foremost May, 1926 Courtesy Western Union Telegraph Co, portrait painter in America, before whom sat presidents and generals and states- men, and whose works, as head of the National Academy of Design, acclaimed at home and abroad. Then, just at the moment when he reached the height of fame as an artist, just when he was returning from triumphs in Europe, with bright prospects for financial ease and still higher honors, an aspiration from the clouds caused him to renounce all he had gained and begin again—this time as an inventor with a great idea. were N THIS second life of his, however, he called to his aid a wealth of valuable experience from the first. As a struggling artist, he had mastered the lesson of ever- lasting persistence. He had learned that perfection comes only after countless trials and failures. Once, for example, while he was a young art student in London, he care- fully finished a drawing which he in- tended to offer to the National Academy for admission. He showed it then to one of the great English masters of the day, Benjamin West. “What do you think of it?” asked young Morse, hopefully. The master artist examined the draw- ing closely for some moments. “Very well, sir, very well,” he said finally. “Go on and_ finish _ gers, who raised their brows skeptically as he tried to ex- plain his ideas to them. At last the Sully arrived in port, and Morse went to the skipper, Captain Pell, to say farewell. “Well, Captain,” he said, “if you should hear of the telegraph one of these days as the wonder of the world, re- member the discovery was made on board the good ship Sully.” Those prophetic words marked Morse’s achievement as one of the most extraordi- nary feats in all the history of invention. Seldom, if ever, has an inventor so completely grasped the full significance of an idea at the moment that idea was born in his mind, or so completely foretold its suc- cessful fulfillment. Yet in his supreme confi- dence that he had brought forth a new wonder of the himself From Our First Issue IFTY-FOUR vyears ago, shortly after the death of Morse at the age of 81, the first issue of PoPULAR SCIENCE MONTHLY, appear- ing in May, 1872, paid this prophetic tribute: “Professor Morse has completed his career, and taken his place in the past. now to memory and to fame, and his name and work will help to save our age from oblivion. “After a few thousand years, when the infe- rior races of men shall have disappeared from the earth, except perhaps a few samples pre- served as antiquarian specimens; when civiliza- tion has overspread the world, and the tele- graph system has become so universal and per- fected that any individual will be able to put communication with any other individual upon the globe,— then will the name of Morse, one of the great founders of the system, be more eminent than any upon whom we now look back as the illus- trious of ancient times.”’ into instantaneous He belongs “But it zs finished,” said Morse in surprise. “Oh, no,” West answered. “Look here, and here,” point- ing to a number of unfinished places that had _— escaped Morse’s untrained eyes. Somewhat disappointed, the young artist took the drawing back to his lodgings, where he labored over it for a week. Then he returned. This time the master was lavish with his praise. “Very well indeed, sir,”’ he said. ‘Go on and finish it.” “But isn’t it finished?” “Not yet. See, you have not marked that muscle, nor the articulation of the finger joints.” Again Morse spent days re- touching his picture. “Very clever, indeed,” said West when he came the third time. “Well, go finish it.” “T can’t finish it!” cried Morse. (Continued on page 135)

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Ave nor ger aid uird 135) May, 1926 Now POPULAR SCIENCE MONTHLY 19 ome Oil-Electric Locomotives *, HIATOR if SAIR RESERVOIRS4 | RADIATOR ___ ae ee ATOR __ BA ( The Engine of the Future The drawing above shows the construction of the powerful new oil-electric locomotive which, according to its inventors, may supersede steam and electric engines on American railroads. Note the compact arrangement of its various features Capable of Vast Power At the left is a front view of the giant six- cylinder, sixty-ton engine that furnishes the power for the latest type of locomotive which, it is claimed, will one day haul a train across the continent without a stop How Controls Work The plan at the left illustrates how the oil engine, the generator, and the motors on the front and the rear wheels are connected with their controls in the engineer’s station HE introduction of oil-electric locomotives marks the latest advance in railroad operation in this country. These new locomotives, perfected within the last few years, are said to be as speedy as the fastest steam engines, and to have tremendous hauling power. They are able, it is claimed, to haul a train across the continent without a stop for changing engines or for fuel or water. Cinderless, smokeless, and noiseless, they insure cleaner and more comfortable passenger trains. Superior power and more economical operation than steam locomotives are reported as the result of recent tests by the Central Railroad of New Jersey, in which a sixty-ton oil-electric engine handled, in a given period, 11,000 more tons at a fuel cost of twenty percent less than a steam engine. The use of these engines, it is said, will reduce maintenance costs one half, and each engine will last twice as long as a steam locomotive. Simple and Compact Control The control station of an oil-electric locomotive. The engine throttle is seen in front of the window, with the motor control just below for convenient operating

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20 POPULAR SCIENCE MONTHLY May, 1926 [ts a Game of Glorious Tue wonder horse, Man-o’-War, greatest of all American racers. This picture shows the magnificent animal in his prime, galloping through a morning workout—an im- portant part in every thorough- bred’s training. Man-o’-War has been called the finest race horse in history; yet even this phenomenal winner was defeated once, unex- pectedly, by a horse called Upset ing with sweat, clods of earth and swirls of dust rising beneath their thundering hoofs; straining, panting, yet moving with rhythmic grace as their space-devouring leaps carry them down the yellowish ribbon of track. Stunted, hard-faced jockeys in blouses ‘and caps of brilliant -silks, hunched like monkeys on sticks on the very necks of their mounts, their spare bodies bobbing violently up and down as they urge the horses to greater speed. Roars and screams from the throats of hysterical thousands growing in swift crescendo to a deafening blast as the field sweeps by the neat pagoda that shelters the judges and marks the finish of the race. Then, suddenly—silence. For a moment you hear the gentle flapping of flags on the grand stand roof. Then comes a hum of conversation, and the rustle of paper—programs, news- papers, “dope sheets” —as the onlookers discuss the event just run. The horses, brought to a stop a quarter of a mile or so beyond the finish line, turn and trot lei- surely back to the judges’ stand, where the jockeys salute, dismount, “weigh in,” and pass back to their quarters. Hostlers throw light blankets about the horses and lead them to the barns. A band blares forth in a lively tune. That’s horse racing, famous “sport of kings,”’ the most romantic and glamorous game of all—as you see it from the grand stand. Twelve thousand times a year, ez thoroughbreds, coats gleam-

<f “a te = Low the Science of Making Race Horses Often Is Upset in the Stern Test of the Track

A Tense Moment A typical scene during one of the thousands of horse races which each year at- tract multitudes of scream- ing, hysterical spectators approximately, such scenes are enacted on recognized tracks in the United States, Canada, Mexico and Cuba alone. But from the grand stand you see only one side of racing—the spectacular side. Behind, is an earnest, studious group of men—breeders, trainers and owners—to whom horse racing is a science; a field for constant research and experiment. With them, racing goes far beyond the bustle and excitement of a race meeting to quiet farms where animals are bred scientifi- cally and trained systematically. HE study of eugenics and heredity is an everyday part of their business, and some of them can trace the ancestry of their charges back beyond Bully Rock, the first thoroughbred to come to America, and other famous horses, im- ported into Virginia from England long before American independence. With justifiable pride, they will tell you of the proud lines of British and Colonial an- cestors from which this or that horse is descended. With these men, the cardinal principle of the science of horse breeding is stated readily. Mares which have been winners and come from lines of winning horses are

Nine Days Old—a Future Winner? This ungainly little new-born filly comes from a line of winners—from Mercia (above) by Purchase, a famous racer. Whether the baby will be a winner, too, is one of the uncertain- ties of the game; but in any event she will be coddled, petted and trained as all racers are mated to horses that likewise come from winning lines. The theory is that the progeny should be winners also. But sometimes—very frequently, in fact, horse racing being the uncertain propos!- tion that it is—they are not. The foals, coming in March or April, make their bow as yearlings to the public in the sales ring early in their second summer. Colts and fillies of distinguished ancestry bring high prices at these

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LS oS May, 1926 Uncertainties By Greorce Lee Down, Jr. auctions, the purchasers being guided largely by heredity. Sometimes these colts justify their heritage; more fre- quently, though, they do not. Thus, of about 200 well-bred yearlings sold to leading American racing stables in 1924, only about seventy proved themselves “bargains” in their first year of racing last season. Of the rest a goodly number won not asingle purse for their pur- chasers. F COURSE, these young horses may prove worthy descendants of their noted ancestors in later years of racing, or in time may themselves beget real racers, who will repay their breeders a thousand fold for their investments. But it is a rash man who will dare hazard a prediction as to what a race horse will or will not do. And it is in this constant, glorious uncertainty that lies the real explanation of the lure of racing. There is an old saying among turfmen that “anything can happen at a race track.” And “anything *’—that is, the un- expected—does happen—and every day! With flying leaps, grace- ful in every movement, the racer thunders down the yellow track POPULAR SCIENCE MONTHLY A few months ago one of the best American trainers prepared a list of one hun- dred ways in which the best horse could be beaten in a race. These ranged from falling to being nosed out at the finish because an excited jockey turned his head as his hat blew off. In 1923 a Chicago turfman, William Daniel, picked up a yearling colt, Master Charlie, at auction for $1,000. In the following year’s racing the colt won stakes and purses aggregating $95,525, and was acclaimed by some the best horse of any age in the country. But, before the first spring stakes were run last year, Master Charlie de- veloped unsound legs and was withdrawn from racing. Two years ago Mrs. Payne Whitney paid $15,500 for a yearling colt, Nurmi, half- brother of the illustrious Zev, hero of the famous $100,600 international race with Papyrus, English Derby winner. Last year Nurmi won only $2,478, scarcely a fair return on his pur- chase price. In January of this year, though, he justified his owner’s and “Schooling’’ at the Barrier A remarkable photograph showing how young horses are schooled by the official starter to stand quietly behind the barrier while it is down. The instant the barrier is “sprung,” they leap forward. mals be made to keep as straight and quiet a line as this Seldom can the restless young ani- trainer’s faith by scoring a wholly un- looked-for victory in a $30,000 stake race. One might go on recounting similar cases almost without end. There was, for example, the colt, Playfellow, full brother of the great Man-o’-War. Harry S. Sinclair, the oil magnate, paid $100,000 for this animal, in the hope that he would follow the family habit of making turf history, only to dis- cover that Playfellow’s constitution and_ habits precluded the possibility of his ever becoming a high class horse. Before that Samuel C. Hil- dreth, trainer of Sinclair’s Rancocas _ stable, _ paid $115,000 for the colt Inchcape, son of Friar Rock, three-year-old champion of ten seasons ago, only to have Inch- cape develop a skin dis- ease that made him unfit for racing, Yet, although this un- certainty of race horses (Continued on page 130) The Training Camp Every large race track has an inclosed course where the horses are kept in training during the winter. These views of the Rancocas farm in New Jersey show how the track and stables are housed under one roof. Notice, in the oval picture, how these novel palatial stalls tine the track

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POPULAR SCIENCE MONTHLY May, 1926 How Large Can a Star Ber New Discoveries Show That a Sun More Than Fifty Times the Mass of Ours Would Burst into Fragments By Newton BurRKE O MOST of us, the Sun, which for millions of years has been light- ing and warming the Earth day after day, seems quite the greatest and most im- portant body in the universe. Yet actually our Sun is a relatively unimportant little pinhead of fire compared with some of the vast flam- ing stars swinging through space so far distant from us that they can scarcely be detected with the powerful instruments of astronomy. Just by way -of compari- son, imagine that you could hop into your car some day and travel without stop in- definitely. At a continuous speed of sixty miles an hour, you could complete a trip around the Earth’s equator in about seventeen days and eight hours. In a little less than five years, you could cover the distance at the same speed around the Sun. But to circle Antares, the largest star we know of, in your fastest motor car, you would take approximately 1,370 years! The diameter of Antares is estimated at more than 273,000,000 miles, or more than 300 times that of the Sun. And Antares is only one of a number of giant suns. Betelgeuse and alpha Hercules are almost as large. They are so huge that not one of them could find room in the vast circle described by the Earth in its path around the Sun. ALLS of fire so enormous as these stagger human imagination. Quite naturally, they lead us to ask whether there is any limit to the size of a star; and, if so, how large it is possible for a star to be. Answers to these questions recently have been’ given through remarkable measurements by A. S. Eddington, noted British scientist. A star whose mass is fifty times that of our Sun, this astronomer found, has reached its limit in greatness. Stars of greater mass than this cannot exist; they would burst of their very enormity. Their own pressure from within, combined with the centrifugal force of rotation, would overbalance the force of gravitation hold- ing them together, and they would fly apart in billions of fragments! In these calculations it must be re- membered, of course, that the mass of a star depends on the weight of materials composing it, and is quite a different thing from volume. Thus, while the great star Antares is hundreds of times

Greater Than Earth’s Whole Path around the Sun Antares, the largest known star, is just one of a number of giant suns, none of which could find room in the vast circle described by our Earth in its path around the Sun. To motor around it would take 1,370 years larger in dimensions than the Sun, its mass is within the outside limit of fifty times the mass of the Sun. Eddington’s startling conclusions were reached through a study of the light radiation of stars and its causes, by means of ingenious modern instruments of meas- urement, such as Michelson’s interferom- eter, the spectroscope, and improv ed photographic apparatus. He learned that in the center of a star whose mass is one < a Pa PRESSURES. CENTERS. a 180,000,000 LBs.PER | ~* SQ.IN.=6000 GUNS eee ae,

Equal to 6,000 Big Guns The terrific pressure at the center of the Sun has been estimated at about 180,000,000 pounds to the square inch—6,000 times the breech pressure developed in firing our largest coast defense gun. A star more than fifty times the total mass of our Sun would burst and one half that of our Sun, the heat reaches the tre. mendous temperature of 8,550,000° F. Even a spot halfway between the center and the surface reaches 2,395,000°. The pressure at the center is 21,000,000 at- mospheres, or more than 300,000,000 pounds to the square inch—at least 10,000 times as great as the breech pressure of Uncle Sam’s largest coast defense gun. DDINGTON learned, too, that just as there is a limit to the greatness of stars so also there is a limit to their smallness. <A _ star less than one seventh the mass of our Sun, he dis- covered, would cease to shine. For the temperature at its surface could not reach 5400° F.—the lowest temperature at which a star can remain visible by light radiation. Of dwarf stars, there are undoubtedly far more than we know of, but most of them are invisible to us even through the most powerful telescopes. The smallest ob- served and studied, a distant companion to alpha Centauri, is probably close to the limit of visibility and gives only so0,o00th part of the light of the Sun. These dwarfs have diameters between 155,000 and 580,000 miles in length, hence are much smaller than the Sun, which has a diameter of 865,350 miles. HESE new measurements, inciden- tally, led to interesting conclusions about our Sun. For instance, his cal- culations indicate that the highest sur- face temperature the Sun ever reached was about 16,200° F., while its present surface temperature is not more than 10,800°—thus supporting the theory that our Sun is a “dying star.” That such may be the case, however, need cause us no alarm, scientists tell us; for even if the Sun’s energy should con- tinue to decrease at a regular rate, it would take millions of years before it would cool off enough to injure life on Earth. In fact, astronomers say the Sun does not get its heat by burning up as we burn coal. Instead, much of its heat seems to be developed by explosions or changes in atoms of matter compos- ing it. Thus, so far as we are concerned, store of energy is inexhaustible. The Sim has been supplying warmth to its fam- ily of planets for probably millions of years and, to the best of our knowledge, will continue to do so for many centuries to come.

ee ee ee ee ee a A a

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26 May, 1926 Resor rr, TRY iT Sam Loyo's % emengt of th contain your ger ze: age}. é pay: “Lachey Nahe” jp Sante Ht your age is ia 1, 2 sox 3, then Peon 4 Y ateds GUESSES YouR AcE! TELLTALE Puzzie FO: SDK cm vy ye ORC gy 4 3 oe 6? Look theousds alt tumibers of such 123. W tit “ Nummer” et uickly down to the Witch's Beko) ne me : POPULAR SCIENCE MONTHLY tix oF thems. pacwcls: as your %, Can You Solve the 23 AM LOYD,the world’s greatest puz- zle expert, in his work- shop constructing his newest mechanical puz- zle, an age-telling ma- chine. For many years he has entertained and mystified the world with his ingenious problems W orld’s Greatest Puzzles ? Millions Have Tried—Sam Loyd, Famous Inventor of Brain Twisters, Reveals Some of Hts Secrets HAVE never met a normal, thinking person whose bump of inquisitiveness did not lead him to take at least a mild interest in puzzles. When a man tells me he is utterly indifferent to puzzles and never tried to solve one, I can only conclude that he is lacking in a certain wholesome enthusiasm, without which life is a drab affair. For while jostling against all manner of people it has been impressed on my mind that the successful ones are those who have a natural faculty for solving puzzles. Life is full of puzzles, and we are called upon to solve such as fate throws our way. We are constantly propound- ing and solving puzzles without realizing it. Exactly the same faculties that business problems engage are brought into action in puzzle solving. To set aside a certain type of mind as of the puzzle solving kind would be a rash assumption. Puzzlers are recruited from all walks of life, and no particular profession, trade or oc- cupation provides a larger quota than another. : Some of the world’s great figures in science and letters have not been too proud to affix their names in author- ship to puzzles. Famous sciéntists like Newton, Euler, Tyndall, Cardan, Huxley and Herschel, and eminent writers such as Byron, Voltaire, Ma- By Sam Loyp The puzzles of Sam Loyd are known ‘throughout the English-speaking world and for more than thirty years have appeared daily in a hundred American newspapers. His is a fascinating and unusual story. caulay, Longfellow, Cowper, and Poe con- tributed brilliantly to the puzzle library. Lewis Carroll, author of Alice in Won- _ derland, was an Oxford professor of mathematics and the author of many quaint and difficult puzzles. P. T. Barnum was an inveterate puz- - zler, and exhibited his faith in the lure of puzzles by using them in his circus ad- vertising. Thomas A. Edison has: indorsed puzzle solving as a mental training, and reveals his own knack for puzzle construction in his famous questionnaires. Theodore Roosevelt was a puzzle fan, and encouraged his children to partici- pate in puzzle contests. During White House days the young Roosevelts were regular-entrants in my puzzle solving tournaments, and more than occasionally flashes from the vigorous mind of the great American were discernible in the young folks’ papers. Hudson Maxim, the noted inventcr, is as enthusiastic a puzzler as I know of. Once he wrote me, saying: “Men and women are but children of a larger growth, and just as the kindergarten teaches the little folks nN i) 4 by methods which make instruction interesting, so children of any larger growth are more effectively instructed The Worid-Famous 1 39|6|7|8 9 | 10) 11) 12 by methods which awaken interest and pleasure by stimulating creative 14-15"? Puzzle 13)14/15 imagination through tasking it with the solution of an interesting prob- This puzzle, originated more than fifty years ago, created a furore the world over. The problem is to move the blocks through the open space bringing the 14 and 15 into correct order as shown at the right. To work on the puzzle, cut a sheet of paper into squares and number them to corres- pond with the blocks. Then move them about on a larger square drawn on another sheet to correspond with the box lem. Puzzles are just the thing for teaching mathematics.” N FACT, to print the roster of habitual puzzle solvers who are prominent in other circles would

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24 POPULAR SCIENCE MONTHLY May, 1926 require a volume comparable to a city directory. The names of distinguished clergy- men, lawyers, doctors, educators, authors and publicists are common- place in the puzzle edi- tor’s correspondence. The devotion of these busy people to their puz- zle practice is intense and constant. I have many correspondents who have been follow- ing my puzzles for years, and time seems only to intensify their devotion. A young lady of Boston, now in her eighties, has written me on the sub- ject of puzzles at least once a month for the last twenty-five years. HE art of puzzle composition consists of building a structure of ingenious clues around a skilfully concealed piece of information. The first object is to pique curi- osity and imagination— in brief, totease the solver into trying the puzzle. N SN XY a ee, 4 / The Disappearing Chinaman Move the earth to make arrow point NE—and count thirteen Chinamen. Then move arrow to NW—and there are only twelve Chinamen in view. Which man has vanished? Where does he go? Was Titi, oe) 4 ef we #Y SAMLoYO Mage, o> “lees introduced himself to Eve with the words, “Madam, I’m Adam.” The most famousof palindromes is that pur. porting to be the great Napoleon’s soliloquy, “Able was I ere I saw Elba.” It is well authen- ticated that the “man of destiny” turned to puz- zles for solace and recre- ation in the days of his exile, and a number of clever puzzles have been ascribed to him. UZZLES built upon geometrical principles are great favorites, es- pecially those that deal with the dissection of plane figures. Most of the wooden and _ wire puzzles sold upon -the streets and in shops are concerned with geom- etry. Puzzles can be made out of almost anything in the hands of one whose talents lie in that direc- tion. Young people take delight in puzzles which employ coins, buttons, Without this lure, the puzzle is a failure. If it is difficult, that fact must not be apparent. On its face it must be like Bret Harte’s Heathen Chinee—childlike and bland—although like that same individual it may be tricky and peculiar. The condi- tions must be clear and exact, permitting of no quibbles as to interpretation. It is a poor puzzle that relies upon twists in the meaning of words. In the construction of these synthetic mysteries lies the sphere of the puzzle in- ventor, and for some reason the public is inclined to regard his operations as in the realm of black art. Replying to the oft repeated query as to how puzzles are originated,—whether they come spontaneously or as a result of careful planning,—I would say that the best type of puzzle is usually a mix- ture of inspiration and science. Puzzles, like other inventions, are seldom made to order. They are, of course, developed and built up from ideas, but these nuclei must first be wooed and won. One for the Figure Sharps The smaller design shows how a clock dial may be divided into three sections, each of which contains numbers adding up to 26. Now all you are required to do is cut the larger dial into FOUR pieces so that the sum of the numbers in each of the four pieces will be the same. You'll find it a real puzzle bodies of the Chinamen. Thirty years ago, Sam Loyd invented this mystifying mechanical problem. Cut out the square, then cut carefully around the outline of the earth through the Place the two pieces on cardboard and stick a pin through the earth’s center so that you can revolve it. directions printed on the puzzle above—and you will be surprised at the result Puzzles, of course, reflect the intellec- tual bent of their originators. The mathe- matician naturally, evolves his problems from the science in which he is proficient, while the man with a literary bent will clothe his conceits in the peculiarities of ©e © © This Is Sam Loyd’s Best Puzzle Each of the three householders was entitled to pipe water from each of the three wells, neces- sitating nine pipes in all, and they had to be laid according to the rule of the plumbers’ union, which says that no pipe shall cross any other pipe. Can you show how each house- holder may have water piped from all three wells to either his front or rear door and with- out violation of the plumbers’ aforesaid rule? language. In the latter class are ana- grams, acrostics, enigmas, charades, con- undrums, riddles, rebuses, transpositions, and, of course, the puzzle family’s healthy baby boy— the cross word puzzle. Among these also should be mentioned palindromes—words or sentences that read backward as well as forward—a very ancient form indeed if it is true that Adam Then follow the simple match sticks, string, wire, pencils and similar com- mon objects, and anyone with a good repertory of such wins their hearts. In fact, one clever trick as a stock in trade and a happy faculty for showing it off, can make the performer pass as a genius for a whole lifetime. Like thousands of others, I can trace my initiation into puzzledom through the old 14-15 block puzzle, originated more than fifty years ago, and which was puz- zling the entire nation when I was a lad. I stuck at that taunting box of blocks until I succeeded in proving that it could not be worked out! This statement, even at this late date, will be somewhat of a shock to many an old-timer who spent time that eventually had to be reckoned in years on this intriguing mystery. Let us look again at this old box of * blocks which drove your forbears nearly crazy half a century ago. As shown in the illustration on page 23, the fifteen blocks were arranged in (Continued on page 118) 6|/1)8 -i wie 2| 914 Ancient Magic Square Puzzle The diagram on the left shows the simplest form of Magic Square, a puzzle design whose origin is lost in the mist of antiquity. Each line of numbers—across, up and down, and the diagénals—adds up to 15. Can you reverse the proposition, rearranging the numbers in the diagram at the right, leav- ing the 5 in the center, and produce eight different totals when you add up the figures? May, The origi broa ing rep’ prit cas jus Jen pro gra the of fla ap ab inc wh gu be lor po ot! bl mi

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May, 1926 POPULAR SCIENCE MONTHLY Unique Radio Pen Makes Ink Copies Device Can Be Used on Your Set through : Loudspeaker Jack Metal Used for Contacts The “radio pen’? transmitter with the original drawing and print used for broadcasting. Metallic ink or zinc etch- ing establishes the electrical contact REMARKABLE “radio pen,” which traces in ink reproductions of cartoons, maps, printed matter or script broad- cast from a distant station, has just been perfected by C. Francis Jenkins, inventor of the Jenkins process of transmitting photo- graphs by radio. It is said to be the only existing device capable of tracing ink reproductions on a flat surface by radio. The apparatus, surprisingly simple in appearance, is a small mahogany cabinet, about eighteen inches square and eight inches in height, and has a tilted top on which are mounted the “radio pen” and guides for holding and moving the paper beneath the ink stylus. The pen is a metal arm about six inches long, having at one end a steel split pen point of the drafting type, and at the other end a small magnetic box, resem- bling the ear piece of a headset. This magnetic end is mounted on an axis, per- Signs 11,564 Letters in Two H Traces Pictures in Ink A close-up view of the receiving apparatus of the “radio pen”? which reproduces all kinds of line drawings and print broadcast by transmitter mitting the pen to sweep across the paper in arcs the width of the sheet. The pen, which is hinged to the arm, is connected to the “ear piece” with a Operates on Any Radio Set Above may be seen the “‘radio pen” receiver hooked up to a regular radio set. Just over the novel instrument, at the left, is a finished line drawing it has reproduced series of levers, so that every movement of a tiny iron bar, mourfted so as to re- place the customary dia- phragm, is communicated to the pen, causing it to touch the paper and make an ink mark. As radio impulses actuate the magnets and depress the bar, the pen also is depressed, and, as it is drawn across the paper by a radio-controlled mo- tor, a line.is produced. These ink lines, properly placed, form the com- pleted picture. The radio impulses are generated by a similar-appearing machine at the broad- ‘asting station. The difference in the transmitter is that the lines of the original drawing, either done in metallic ink or etched on zinc, form an electrical contact between the points of the tracing stylus, making and breaking an electrical circuit, which is broadcast in the usual way. The drawing is shifted downward after each sweep of the stylus. ours with Unusual Device IGNING 11,564 letters in two hours was no exhaust- ing task for Miss Ger- trude Robinson Smith, president of a national women’s club, aided by an in- genious device called a signagraph. Each stroke of her pen set in motion twenty little foun- tain pens, working simultaneously. Two assistants aided her, one to feed letters to the machine twenty at a time, and the other to take them off when they were signed.

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€ Raw Material Here is a typical ‘‘ rookie” on his first day in a citizens’ training camp—pale, awkward, uncomfortable in his ill-fitting uniform. Before his month in camp is up, he will be transformed into a smart, stalwart soldier Don’t send me home, please don’t send me home! Tell me what I ever did to you,— Oh, oh, oh, oh! have a little pity! I’m a poor candidate, In search of war I roam. IP mwith you in most anything youdo, But please don’t send me home! students attending the war-time officers’. training camps nine years ago this summer. Life in these camps was no restful ride on balloon tires, as I can testify from personal experience; but it had so many compensations that one’s chief worry was to win marks good enough to keep from being “sent home.” Within a few months, 35,000 young Americans will be spending a month each in the citizens’ military training camps that are direct descendants of the first Plattsburg camp, father of the war-time training camps. They will have even better cause to plead not’ to be “sent home” than did those hard-driven men of the A. E. F. who went before them. S: IN plaintive chorus, sang the POPULAR SCIENCE MONTHLY ‘Army and Your Boy What the Citizens’ Training Camps Are Doing for the Health of the Nation By Artuur GRAHAME 3 “4 P 2 - ‘ew Where He Learned to Box John Coolidge (left), son of the President, who recently took part in the Amherst Col- lege boxing tournament, is seen here spar- ring with Captain Freddy Welsh, a former champion, at Camp Devens, Mass., last year In the camps of today, the nerve rack- ing drive of the war camps is absent. Grim-faced learners of the business of war are replaced by grin-faced youths having the time of their lives, for the Army has turned from training youth for war to training youth for peace—to in- structing young Americans in the duties of citizenship, to building up their bodies by drill, exercise, and outdoor sports; incidentally giving them without cost a much better vacation, and a more beneficial one, than money could buy. May, 19% Adding to Their Chests Every day the amateur soldiers take calis- thenic exercises in the open air. The result is that the average gain for each man is thir- teen pounds in weight, one fourth inch in height and half an inch in chest measurement These citizens’ military training camps are conducted by the Army under the provisions of the National Defense Act of 1921. They are, as President Coolidge has pointed out, “essentially schools in citizenship.” The basic, or first year, course consists of physical training, in- struction in the duties and responsibilities of citizenship, instruction in hygiene and first aid, drill, and rifle marksmanship. Less than half the 110 hours of instrue- ticn are devoted to purely military subjects. This summer, soldiering seems destined to have an increasingly beneficial effect on the general health of the nation. Last summer, 33,500 men between the ages of seventeen and 31 attended the camps. More than half of those who applied for admission were high school students. DIRECT result of the thirty days of healthful living and careful train- ing was an average gain in weight of four pounds, an average increase in chest measurement of between one fourth and one half inch, an average increase May, 19 chest € averag correc’ inch. tion @ and Vv: An mate \ took h of pra ful liv the b men \ will t Cong! upkee 7 milite appli M. 1 Arm) tion, phys Freq vent he i posse Min type exal had 7 —in cal | cial inat per hav not tral fort the wh ‘| he cit he

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4 May, 1926 chest expansion of nearly an inch, and an average gain in height—the result of corrected posture—of nearly one fourth inch. Another direct benefit was inocula- tion against typhoid and paratyphoid, and vaccination against smallpox. An indirect benefit that is beyond esti- mate was that every graduate of the camps took home with him a working knowledge of practical hygiene and habits of health- fulliving. Judging the future by the past, the bettered health of the 35,000 young men who will attend this summer’s camps will be well worth the $2,800,000 that Congress has appropriated for their upkeep. “rTMHE candidate begins to draw health dividends from the citizens’ military training camps the moment he applies for admittance,” Major-General M. W. Ireland, surgeon-general of the Army, told me. “In making his applica- tion, he must undergo a_ preliminary physical examination by a local physician. Frequently this is the first real health in- ventory he ever has received. Often, too, he is told, for the first time, that he possesses remediable physical defects. Minor physical defects of this remediable type are common. Half of the men examined under the Selective Service Act had them. “In camp, he receives other dividends —inoculation against disease and a physi- cal examination by medical officers espe- cially trained in this work. These exam- inations have shown that about four per cent of the men sent to the camps have physical abnormalities that would not permit them to undergo military training. They also have shown that forty-four percent of the men enrolled in the camps had minor physical defects which could be remedied. “DUT it is when be begins his actual training that he draws his biggest health dividends. “As a rule, the youth who enters a citizens’ military training camp is a healthy young animal, ignorant of the means by which his physical well-being may be maintained and improved, and heedless of the future so far as his own health is concerned. Often he is slouchy, careless and soft muscled. Thirty days POPULAR SCIENCE MONTHLY later he goes back to civil life well set up, muscular, and with new ideas about the importance of devoting some thought and effort to maintaining his physical fitness. “T have seen raw, untrained boys and men after thirty days in a camp parade before the President of the United States in a manner that would have been creditable to seasoned troops. “A Medical Corps officer on duty in one of the middle western camps last year was telling me only a few days ago of the almost magical transfor- 27 him a poor example of a soldier for a few days. Then he suddenly awakened to the fact that one who shirked in camp became frightfully conspicuous, so he began to enter into the drills and the physical exercises with a little more spirit. Like- wise he became conscious suddenly of a queer change in his physical feelings. He didn’t know it, but the change was due to the unaccustomed exercise and the absence of sweets from the camp mess. mation worked in some of the men and boys who passed under his eye. There was a fat boy of seventeen, for example, whom everybody in camp called “Tubby.” He didn’t want to go to camp, but his father had insisted. His natural physical aversion to effort, coupled with his indignation at what his father had done, made Army Shoes Don’t Pinch Feet spread and swell under the unusual use they get in camp, so shoes must be fitted scientifically. At right, a medical officer is seen measuring a recruit’s foot as it spreads under the weight of the two heavy pails of sand he is seen holding Long hikes through the woods are part of the routine of every citizens’ training camp. They are not taken, though, until the recruits are hardened; otherwise, blistered feet might result Playing War This typical scene at : the Plattsburg, N. Y., j camp shows a squad of recruits firing a ma- chine gun at a target some 800 yards away “The fat that he had been accumulat- ing for years began to melt and his clothes became loose. Eight pounds disappeared in the first ten days. At the end of thirty days, Tubby had lost twenty-four and a half pounds—and his nickname. More- over, he’s going back to camp this sum- mer. “There was another young man, older than Tubby, who went to camp two years ago because he had nothing better to do. He was one of those good-natured lazy fellows who never seem to accom- plish much because they never stick at anything long. He had been unsuccessful in school; his business career had been a succession of jobs lost through incompe- tence. At camp, for the first time in his life, he had to do the things that would build up his body, strengthen his muscles and make a man of him. “Stimulated by (Continued on page 133)

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28 Made a Century Younger This charming Dutch colonial dwelling at Cedar Grove, N. J., was remodeled from the 100-year-old cottage in the picture below F YOU want a home quickly and at | moderate cost, you don’t have to build a new house. Buy an old place, move in, and tinker and doctor it up when and as you please. A barn will make a dwelling, even a stable is not to be sneezed at. Frequently the worse the ruin the more chance for a clever job, and the greater the credit for the transformation. Remodeling old houses is popular in America. Formerly folks were somewhat apologetic about second-hand, tinkered domiciles. Today, thanks to the example of our “best people’’—the artistic as well as the moneyed—it is good form to live in an old building. An abandoned church, a lighthouse and a chicken coop have been converted into homes without bringing social stigma. In the East, colonial ruins are favored. An architect is hired—but not to raise the low ceiling or to multiply the scanty windows or to throw several cubby-holes into a few spacious rooms. He dare not desecrate the makeshifts of our pioneer sires with obvious modernity. His task is to keep everything seemingly two cen- turies old, while he cun- ningly hides the essential POPULAR SCIENCE MONTHLY May, 19% A Dozen Tips on Remodeling You can find sturdy con. struction in old ruins, but comfort usually is q result of your ingenuity By Joun R. McManon 7. 8. 10. 11. 12. When You Remodel: Make a cellar, if there isn’t one, by lifting house or dig- ging under. Point up or face foundations with rich cement. Additions to walls can be built down as well as up. Replace decayed sills and beams. Inspect all timbers sub- ject to moisture. Rebuild old chimney and put in flue lining. Leave old shingles ov roof, unless too curled. Ccver with new material. Let outside wall covering stay beneath new siding, shingles or stucco. If there are no outside sheath- ing boards, put them inside. Equalize floor levels; get rid of a “step up or down.” Put new flooring over old. Lift low ceilings. Increase light and air wiih more or larger windows. Make larger rooms from cubby- holes by changing partitions. The New Covers the Old W. Pearce, 80-year-old mason, plastering a wall in the house shown above. Note the original mortise for supporting crossbeams and the “‘wane”’ stud, with the bark still on old manse, but it is foolish to sacrifice comfort and sanitation for an heirloom effect. There are arguments on both sides for remodeling versus building. You have to put up with what you find in a new ready- built house as well as in an old house; and many become dissatisfied with a made-to-order dwelling. Age is not im- portant; the real factors are material, construction and the state of preserva- tion. The present high cost of building is perhaps the best argument for the old house, reason- improvements in plumb- ing, heat and light. The grand old fireplace yet pre- tends to be useful, but there is steam heat in concealed . radiators. Candles are alight, but the illumination comes from masked electric lamps. Such a house is only ex- cusable as a historical relic, like Ford’s Wayside Inn. Our ancestors themselves would laugh at us for squeezing ourselves into their primitive dwellings. ably bought. Remodeling should not be as expensive as all new work, and it ne not be done all at one time. Other things being equal, of two dwellings twenty- five and 100 years old, would be inclined to choose the latter. The more recent house is balloon framed, that is, built of light tim- bers. The ancient specr men is of heavy construc- tion. The woodwork '8 often oak, walnut and white pine. On the other hand, It is indeed desirable to keep the general lines of an What skill and ingenuity can accomplish was exemplified strikingly in the transformation of this ancient cottage into the modern home at the top of the page the older house generally needs more interior T Ma}

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, 1926 rifice loom s for ve to ady- Ouse; th a ; im- erial, erva- ng is ment 1son- eling nsive need Lime. qual, anty- \d, I 190Se cent med, tim- peci- truc- k Is vhite and, rally Te- May, 1926 Old Houses iene esata NDR npn ecco modeling than the more recent dwelling. Much of the advice given in a previous article of this series on sizing up a new house applies to an old structure. Exam- ine everything from cellar to roof. Figure out how much remodeling you want, and add the probable cost of changes to the price asked for the dwell- ing. You can get an estimate from a car- penter on the expense of remodeling—and then do as much of the work yourself as possible. The lack of a cellar is usually the first problem that confronts the buyer of an old house. There are several ways to remedy this. You can dig out the earth under the structure, move it to a cellared site, or raise it to provide a basement. The last is done often to give the living floor the benefit of dryness, light POPULAR SCIENCE MONTHLY 29 base of the old chimney. An extra tile- lined flue was added to the chimney, sup- ported rather ingeniously by a well rein- forced concrete shelf. It is a long established belief that walls must be built from the bottom upward. This is a fallacy, according to a neighbor of mine. He bought a cellarless house whose foundation walls extended about three feet in the ground, and since these were of good concrete he did not want to demolish them in making a cellar. As an engineer, familiar with tunnel work, he was not long in devising a method. He excavated enough to place wooden props every four feet under the old foundations. Then he dug away the rest of the earth, made forms continuing the old foundations to the level of the cellar The Good and the Bad in the Homes of Other Dave Old houses are usually of sturdy construction, but, as shown at the left, ceilings and door- ways may be uncomfortably low. Above, workmen are shown in the act of removing the old roof from the house on the opposite page after the new roof had been built above it floor, and filled them with concrete. The wooden props were left imbedded in the concrete, where they are as im- perishable as the material that surrounds them. LD cellar walls, laid in lime mortar and even mere clay, can be restored by “pointing up” the chinks with a rich mixture of Portland cement and sand. It is better yet to plaster the whole sur- face with about two and one half parts sand to one of cement. Where the wall is very uneven, has large chinks, and the site is wet, it is a good scheme to build a vertical form about four inches from the wall and fill with sloppy concrete or grout. Use only small gravel or crushed stone in the mix and ram well in place. This will fill every crevice and make and view. It may be the only solution where the site is rocky and cannot be excavated. TIS best to have raising done by skilled workmen. They know how and have the needed powerful jacks, massive beams and_ prop timbers. They can elevate a house, chimney and all, without cracking the plaster to any extent or doing other damage. Usually the house is lifted a few inches above the de- sired height and afterward lowered a smooth, hard, water-tight surface. The ancient chimney, without flue lining, is a fire menace and is best torn down. Doctoring it with cement outside is not much use. Everyone should know that flue lining, made of special fire-resistant clay, is the only safe material. The decayed sill, the first and lowest house beam, often resting on a damp foundation wall, may have to be replaced. So too the first floor beams that are exposed to the moisture of the cellar or of the un- to rest on the new cellar or base- ment walls. Such walls generally are built of solid concrete or of con- crete blocks. Except for the foot- ings, an eight inch wall is enough, according to government experts, though local building codes may require ten or twelve inches. On tm soil the concrete footings may eighteen inches wide and a foot cep. Lately I saw a bungalow raised and provided with a complete sement. Kitchen and bathroom Were placed downstairs, and a umbwaiter carried food to the ining room above. A new founda- tion was built under the elevated Courtesy M.B. Moran, Architect How an ordinary farmhouse at Watermill, N. Y., was re- modeled at little expense into a stately colonial home. taller porch pillars worked a magic change in appearance The lumber from the excavated ground. Dig in with a penknife and the apparently solid wood shows itself punk. Perhaps the decay is superficial and will not continue with improved conditions of dryness and ventilation. We might replace the worst joists and put a new girder under all, with iron column supports. It would be well to scrutinize the old wooden posts. The mystery of why one beam rots quicker than its immediate neighbor was revealed to me re- cently when I looked over a house of the vintage of the 1830's. The pioneer builder had obtained his trees standing around the site and had not been

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POPULAR SCIENCE MONTHLY Letting the Light into an Old New England House The possibilities of the typical oid New England house at the left above with its ugly porch that darkens the rooms of the lower floor, were realized when it was remodeled into the comfortable home at the right. particular in his selection. He cut down an oak, next a tulip tree, then hickory, hemlock and sycamore—whatever was handiest. Enough bark was left on the hand-hewn timbers to help identify them. Naturally the perishable whitewood or tulip could not stand cellar moisture as oak does, and some chestnut joists en- dured much better than hickory. The more recent dwelling is generally built of uniform material, but this fact should be verified; and uniformity may not spell the best choice of lumber. You are in luck when you find first floor beams of oak, chestnut, spruce, long leaf yellow ~ pine or the like. HAT shall we do about the old, leaky shingle roof? It used to be the practice to rip off the old material and shingle new. We now see the advantage in heat and cold insulation, as well as in labor saving, by leaving the first covering on—provided it is not too warped or irregular in surface—and adding a new top. There are many kinds of roofing to choose from, between asphalt, asbestos and copper. Doubling the top is no mere theory. The old-time shingle roof is only a slight protection against the elements, nothing being under the shingles except nailing strips across the rafters. No wonder icy air flows through the attic in winter and chills the house. The better sort of roof as built now con- sists of three layers— AN Courtesy | L. EB. Welsh Architect bright and roomy. The other day I saw an interesting job of this kind done on a barn converted into a dwelling. A previous occupant had begun to remodel the barn, applying siding direct to wall studs. The present owner decided to add stucco to the lower half and shingles to the upper part of the exterior. For the stucco job he nailed lath vertically a foot apart to the siding. Have YOU a Building Problem ? HIS is the third of a series of articles on home building by an authority of national reputation. To make this series still more . helpful, Mr. McMahon places his experience at the disposal of readers interested in home building. If you have a problem, perhaps he can help you. Addréss John R. McMahon, care POPULAR SCIENCE MONTHLY, 250 Fourth Ave., New York, enclos- ing stamped, selfaddressed envelope Then he stapled to the lath galvanized wire mesh of one third inch spaces, and to this he applied the stucco. If there is no sheathing on the outside of a house, it is a good scheme to put it inside, if the interior is not lath and matched sheathing boards, next felt and then the final cov- ering. The under- writers tell us that wood shingles are always a fire hazard. If you must have them, select the best quality, extra thick and hand split. Let the old wall covering of your house stay in place and cover with new siding, shingles or stucco. The usual object of adding a Removing the porch and adding a wing made the house graceful, If you are lucky enough to find a house of funda- mentally sound structure, such remodeling is usually worth-while May, 1 eee plaster, as in the half finished dwelling o summer cottage or extensions. Either put the sheathing directly on the studs or over fiber board. This strengthens the wall and also makes it warm and dr, The inner sheathing may be covered with fiber board or it may be “furred out” and covered with plaster board, wall board or regular lath and _ plaster, In the latter case a moistureproof build. ing paper should be tacked under the furring strips. Usually common North Carolina pine boards, shiplap style, eight inches wide, serve for sheathing. HE walls of a frame house normally consist of four layers of material on the studs or uprights—the outer cov- ering, building paper, sheathing and finally some sort of interior surfacing. An amateur remodeler I know thought he could improve on this combination, and built six-layer walls. The added elements were inside sheathing and be. neath it, on the studs, an extra layer of asphalt roofing instead of building paper. For his ceilings he used twice the usual number of materials, that is, first sheath- ing, then asphalt roofing, next “ceiling” of thin matched boards, finally fiber board. Such a house would withstand is the rigors of an arctic climate, and ina mild region takes very little coal to heat in winter and is always cool in summer. A noteworthy feature is the use of inner sheathing to give a rigid back to fiber board, which is 4 A Ww E co sD eK new outer surface is to make up for lack of sheathing and to improve the appear- ance of the house. Courtesy Atlas Portland Cement Co. Remaking an Old House with the Aid of Cement These two views of a New Hampshire dwelling, before and after remodeling, illustrate the amazing change in appearance that can be wrought by making a few slight structural changes and finishing the exterior with cement. The methods are applicable also to smaller structures rather weak and warpable surface as r ordinarily applied to | studs or joists. With this method, fiber hi board stays flat and FP ihe is as solid as IS FF the. base. the . : If the old house J yp) Lf: | has different floor Fn ‘|. levels, a step up to peri the parlor or ome fF and down to the kitchen, J tak the levels may be J hay equalized by laymg | feat on the old flooring I sleepers or joists, ing on which new floor rin is nailed. Lowering Ke the original joists ove and replacing them the on the foundation ha (Continued on page 195) ]

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May, 19% la- ile elling or Either studs or ens the nd dry, covered “fy rred board, plaster. f build. der the - North le, eight ormally naterial Ler Cov- 1g and ng. hought ination, added und. be- ayer of ; paper, e usual sheath- eiling” fiber hstand ad ina to heat mmer. pf inner o fiber lh is a cand face as plied to s. With , fiber Hat and as its house floor ) up to br one itchen, hay be laying Hooring joists, L floor wering joists y them dation ge 125) May, 1926 POPULAR SCIENCE MONTHLY 31 nly the Daring Work for Him A Single Slip Means Death 7 ] to Eddte Ward’s Pupils By Kart Cuarin May Miscalculation of a tenth of a second may mean a broken neck for the flier who accomplishes somer- saults, shown above, forty feet over the heads of circus crowds Fliers and Catchers A group of aerialists who flirt With gravity twice a day. Eddie Ward, their teacher, is second man from the left The Training School The rebuilt barn, right, in Bloomington, Ill., where Eddie Ward teaches his hazardous profession to boys and girls F YOU have witnessed a cireus perfor- mance in the last four years, you may * have seen the Flying Wards swinging, diving, and pirouetting in the air beneath the dome of the billowing big top, while the circus band played a lilting waltz and the towners on the blue seats gasped and applauded. If you have seen these young hen and women gliding gracefully from perch to trapeze bar, to catcher’s hands and back to perch again, and nonchalantly taking the chances on broken bones, you have witnessed the “flying return act,” feature of the big show. ; Eight of the Flying Wards are “work- hg” in a steel rigging suspended over one thg. Eight other Flying Wards are working” in a similar rigging, suspended Wer another ring. For twelve minutes ey have “stopped the show”: they have the tent to themselves. Finally, as they dive into the net stretched beneath each rigging, swing from the net to the ground, “line up” and “take their bow,” you may notice a heavy- set, blond young man with deep chest, thick arms, and broad shoulders glance with approval at the row of trim-built gymnasts in white tights who are sharing the plaudits. That’s Eddie Ward, chief of the Flying Wards. Eddie Ward has been a circus aerialist for twenty-seven of his thirty-eight years. He has “broken” more than fifty. boys and girls into his exalted branch of the circus profession. He has more than thirty “fliers” and “catchers” on_ his payroll. He is one of the master minds in the world of sawdust and spangles. He has earned, saved, and invested his money until he is worth $150,000. He has made his own way since he was seven years old. And he started on a homemade backyard trapeze! Above: Eddie Ward, a butcher boy at eleven, and today at 38 the teacher of America’s best circus aerialists. He taught himself as a boy on a backyard trapeze You see,” says Eddie, “‘I had to begin supporting my mother and sister when I was seven. I got a job in a meat market and sold newspapers on the side. But I was a healthy kid. Mother's uncle had been a circus performer in Europe. There was a thorn apple tree in our backyard at Bloomington, Illinois. My sister was two years younger than I, but husky, too. We rigged up a trapeze on the thorn apple tree and rehearsed an act. “We got our first professional job when I was eleven years old. It was at the Atlanta, Illinois, county fair. Our salary for the week's engagement was fifteen dollars. To increase our income, we passed the hat. We took in four hundred and fifty dollars that week. When I turned that fortune over to mother, she told me to quit the meat market and paper route and go into the circus business. I have never passed the hat since then,

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POPULAR SCIENCE MONTHLY May, 19% Lab eA. Nit lé 1 L The Greatest Thriller of All The most dangerous and spectacular of all aerial tricks—the triple back somersault from trapeze to catcher—is shown above. The flier, whose path is shown by the dotted line, can control his body during the first and second revolutions, but not during the third but the Flying Wards are the result.” Eddie Ward is one of the greatest utility men in the business, and is al- ways on the job to see that nothing untoward occurs. But, in between times, one gets Eddie’s dramatic story. “T’ve taken a good many falls in my time,” he says. “Sister and I took a lot of them doing our old double-trapeze act. There isn’t any net under a double- trapeze act. When any one lets go, the only thing to hit is the ground. “T got to studying these falls, generally from a hospital cot, and made up my mind there was no future in the straight trapeze business. The salary was limited, the act was old. Flying return acts were just coming on. I owned ten acres and a house and barn on the edge of Bloomington. I rebuilt the barn and started studying falls into a net. When I learned that there isn’t much to falling into a net when you light on your back or shoulders, I framed my first flying return act.” The secrets of success in the flying re- turn act, Eddie naively explains, are im- portant though few. All that is required of the fliers or leapers who do single, double, and triple somersaults from trapeze bar to the catcher’s hands is per- fect muscular control, perfect judgment of time and‘ distance, and the ability to figure on gravity. The requirements for the catchers—and Eddie is one of the catchers—are much the same. BOUT. the only apparent difference between fliers and catchers is in weight and agility. The fliers must be aerial contortionists who know no fear. But the catchers do the timing. They say “Go” to the fliers. Each catcher, hanging head downward from a swinging trapeze, tells a flier when to leave the perch and when to cast loose from the trapeze bar and fly toward the catcher’s outstretched hands. If a flier, after whirling over and over through the air, is just able to touch his catcher’s fingers, that flier is out of luck. Gravity gets him. He keeps on flying and falling until he hits the net—or the ground. That’s where Eddie’s fine work comes in. He starts his boys and girls right, when they join his kindergarten class, Even the stars of the flying return act, who are the stars of the gymnastic world, begin professional life as “carpet acro- bats,” learning back bends, handstands, handsprings, and round-offs. are handsprings started facing backward and ended facing forward. They learn backward somersaults on the ground, with a safety belt or “mechanic” strapped around the waist and held by two old- . timers. Then they are taken into the rigging and learn to fall into the net and to. do flying tricks and fancy dives, still with the protecting belt attached to a block and tackle, keeping them from breaking arms, legs, or necks. Eddie Ward, student of gravity since he ceased to be a butcher’s boy, was one of the first, if not the first, among teachers of circus fliers to rehearse aerial stunts with a safety belt around each flier. “When I learned the business,” he told me, “fliers took long chances when they tried aerial stuff. If they were diving or falling into the net, they might not strike face forward and break their neck, and again they might. If they missed a catcher’s hands, they might land in the net on their shoulders and get only a few welts from the ropes, or they might hit it before they had completed a turn, and so break a leg or worse. I don’t care who it is, if he gets all jammed up while trying to master a trick his nerve isn’t so good after that. The last™ ‘A Triple Back Somersault Thus it is up to the catcher, swinging upside down, to calculate exactly just when the flier’s body will meet his, for the flier must clasp his wrists while going forty miles an hour. The circular picture shows Eddie Ward, seated on a crapeze, in the act of coaching two acrobats “When I take the safety belt off, my fliers haven’t any fear. They know their business. If they do miss a catch, they usually are clever enough to land right—unless luck is against them.” The catcher is the flier’s only insur- ance, for the flier is regarded as a poor risk by casualty companies. As the catcher swings backward and forward on his trapeze, forty feet from the flier’s perch, he must know, although he is upside down, when to say “Go” to the flier. He must calculate to a nicety just when and where the flier’s revolving body will meet his, for the flier’s hands must clasp his wrists while the flier is going forty miles an hour. HERE are many varying conditions to be considered. It may be a bitter cold spring day with snow on the big top. That slows up the gymnast. It may bea terrifically hot day with a temperature of 135 degrees in the dome of the tent. That means perspiration and_ slippery hands and wrists, in spite of extra resining and wrist wrapping. Eddie lost the best flier he ever trained because perspiration interfered with a perfect performance, and because the flier was attempting the most desired and dangerous of all fliers’ tricks —the triple back somersault from trapeze to catcher. The flier was Ernest Lane, who had done the “triple back” in circus tents and on fair grounds a hundred times. He had everything to make a flier—splendid control, perfect nerve, ideal weight, ex- treme agility. But while rehearsing for the spring opening at Chicago in 1920, Ernest let go the trapeze a little before he intended to—-slipped off, in fact. A flier can control his body during the first and second revolutions, but not during the third. Lane’s groping hands, as he flew along, missed Eddie’s outstretched hands. Eddie, resorting to an old trick of the trade, struck at (Continued on page 133) May, 1 b H. — wr De OetlOr

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May, 1926 POPULAR SCIENCE MONTHLY 33 Hungry Moths Cost Us Millions How to Save Your Clothes from Mies a> pica 3 W ool-Eating Pests

e Ten Ways to Fight Moths 1. Before putting clothes away for the sum- , Clothes moths (above) and larvae or mer, unspect thoroughly f or moth esss. worms (below). The worms do the 2. Hang the clothes in the hot sunshine for A damage by eating the garment. Com- a day or two; or press them with a hot Se parison with the button, which is %e-in. iron; or soak them in boiling water. in diameter, gives an idea of their size 3. Keep the lid of ‘your cedar chest shut. 4. Hang clothes where it is light. Brush ; and shake them twice a month. ise a as a single B y G. B. SEYBOLD 5. If possible, use air-tight containers such 4 pia : Pressing with a hot Moth balls or flakes packed with ciothes your fur coat, because it can teat. Its iron kills any moth in a tight container will kill all the pests mouth is imperfect so that it cannot chew. larvae in garments

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34 Americans PI cede ace SPEED 100 MPH HP 4800 bag SRRtan IRC onatew Ty yg ee cute ener meee CAPACITY HP 1500 SPEED €5 M.RH. POPULAR SCIENCE MONTHLY ~ To Europe and Back in a Week The proposed giant dirigible, hovering over a dreadnaught of the sea. This artist’s drawing is based on actual plans for the super-Zeppelin that is to be the EAR the village of Ava, O., lay « storm-shattered mass of wreck- age—the ghastly corpse of what had been the world’s finest dirigible air- ship. Torn asunder in the grip of the winds, the $3,000,000 Shenandoah had crashed to earth, carrying fourteen officers and men to death. In the wreckage, it seemed, lay the dreams of those of us who had placed in this proud ship our faith in the future of dirigible travel. For in the torn and broken hulk we saw but another repeti- tion of the disasters that had befallen the greatest of the Shenandoah’s predecessors. We recalled how the ZR-2, on its trial flight near London in 1921, crumpled and burst into flames, killing all but six of the British-American crew of sixty-six; how the Italian-built Roma exploded above Hampton Roads the next year, killing thirty-four; how the great French diri- gible, Dixmude, vanished somewhere over the Mediterranean in 1923 with fifty souls aboard. We remembered, too, the almost mirac- ulous escape of the Shenandoah on that wild January night in 1924 when the gale tore her from her mooring mast at Lake- hurst, N. J., and the equally dramatic runaway of the British R-33 which bat- tled a terrific storm in the North Sea for thirty hours. A record of tragedy and near-tragedy to discourage even the most optimistic be- lievers in lighter-than-air craft! Yet in the face of it we are told now that in Akron, O., builders are preparing to lay the keel for the greatest airship the world world’s greatest as well as safest airship has ever known—a mammoth of the skies nearly three times as large as the Shenandoah! ‘ How can such a ship be practical or even possible? How can its designers pre- vent another disaster even more terrible than those that have gone before? For an answer to these questions I went to Akron, and there I found a little group of German experts at work under the di- rection of P. W. Litchfield, one of Ameri- ca’s foremost air- an the World’s May, 19% By Joun K. Martin E. A. Lehmann, the German authority op airship operation and first officer of the Los Angeles on its historic trans-Atlantic flight. Working side by side with a score of American engineers and designers, these successors of Count Zeppelin, I found, are contributing their expert knowledge gained through: long experience in diri- gible construction and operation. And all— Americans and Germans alike—are in- tensely bent on fashioning the super. airship—a ship to be not only the great- est but the safest ever devised, and to be known as the GZ-1. OR do they intend to stop there, Although the GZ-1 far overshadows any previous airship project, it 1s no se- cret that these experts already are con- sidering plans for other ships even larger. And before many years, if their plans carry through, we may see whole fleets of aerial merchantmen transporting freight to every port in the world. Every man at Akron is certain it can be done. And their confidence, as I soon dis- covered, finds expression in Litchfield himself, an almost boyish-looking man, whose vigorous frame and clear, searching eyes radiate healthy energy, tremendous enthusiasm, and undiscouraged optimism. As general manager of the new American Zeppelin plant, he is the forceful per- sonality which is projecting the super- airship, and which purposes to make America lead the world in developing lighter-than-air craft for commerce. He is the Count Zeppelin of America. “Tt is entirely possible,” he told me, “to build dirigibles of the Zeppelin type ship authorities, making of this Ohio manufactur- ing city the Fried- richshafen of America. There I found Dr. Hugo Eckener, former head of the famous German Zeppelin plant at Fried- richshafen and commander of the Los Angeles (ZR- 3) when she was delivered across , the ocean to Uncle Sam. There, too, is Dr. Karl Arn- stein, once chief engineer of the German plant, builder of the Los Angeles and nearly 100 other Zeppe- > 3 Photos lins. And with Goodyear . Zeppelin them Captain Company Preparing the gold beater skins for the gas cells of a Zeppelin in the Zeppelin factory at Akron, O. Varnish is applied to the skins to stiffen them and make them more gas-tight, Observe the size of thes¢

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% mn he Ie Se re, Ws se- yn en elr ole ing be lis- eld all, ing ous sm. can per- per- ake ving He me, ype —= May, 1926 Largest Airship The New Dirigible Is to Be Three Times Size of Shenandoah many times larger than any yet produced; and it is possible to build them so that they will be absolutely safe. Engineers know that the larger an airship is, the greater is its efficiency in lifting power and cruising range. It is because of this that we have designed the new wonder of the air to eclipse even the two gigantic British ships whose keels will be laid this year. “PTHE GZ-1 will be solely a commer- cial ship. It will be able to circle the globe in any direction. Although it will be nearly three times as large as any previous airship, it will be easier to navi- gate. As for its safety, our engineering staff, which includes some of the world’s leading authorities on the subject, have worked out the details so thoroughly as to exclude every possibility of a serious accident that might destroy it. In fact, we are so convinced of this that we would give a gold bond as assurance of its safety. — “Here is what the new ship will be like,” he added, spreading on a table a number of plans and drawings. If you were fortunate enough to have seen the Shenandoah before her fatal crash, shimmering majestically overhead, perhaps you may gain, by comparison, some idea of the tremendous proportions of the GZ-1. Imagine these two ships sailing side by side, rudder to rudder. POPULAR SCIENCE MONTHLY The Zeppelin of America P,. W. Litchfield, one of America’s foremost airship authorities, planning to build a diri- gible three times as large as the Shenandoah. “Airships can be absolutely safe,’ he says The nose of the 860-foot GZ-1 would ex- tend beyond the other the length of a city block. If both ships were resting on the ground, the top of the Shenandoah would reach only halfway up the side of the GZ-1, which will be 150 feet high. If placed on end, the GZ-1 would over- shadow the world’s tallest skyscraper. This new aerial giant will hold 7,000,- 000 cubic feet of helium, compared with the Shenandoah’s 2,148,000. It will carry enough fuel for. a non-stop cruise of 6,000 miles. It ‘will be driven at a maxi- mum speed of more than 100 miles an hour, or eighty-five > miles an hour against a strong head wind, by eight motors developing 4,800 horsepower— more than three times the. power of the Shenandoah and sufficient, the designers say, to buck through the fiercest storm or to make a safe land- ing in the severest weather. In shape and general appear- ance, the GZ-1 will resemble the bags and the care used in this process to prevent injury to them. The Varnish is put on and spread with big soft wads, and the girls working on the job wear soft padded shoes so as not to stretch or tear the fabric American dirigible Los Angeles and the two 5,000,000 35 The Smallest Blimp The Pilgrim, P. W. Litchfield’s private air- ship, is only 110 feet long. It carries two Passengers and is used mainly for research cubic foot ships which the British govern- ment is constructing, except that it will be somewhat slenderer in lines. This feature, it is believed, will make it easier to handle, for the ship will present less surface to a head wind. “But why,” I asked Mr. Litchfield, “are you so sure that this magnificent ship will be any safer than preceding ones, or less likely to end in catastrophe?” “Tl let Dr. Arnstein answer that,” he replied. This German technician is the chief engineer of the Akron Zeppelin plant,— exactly the same position he held at Friedrichshafen. He has every detail of design and construction at his finger tips, and he speaks to the point. “TAIRST of all?’ said Dr. Arnstein, re- plying to my query, “we will use a new and improved duralumin metal which will give greater rigidity and strength to the superstructure of the ship. And, in the second place, the structural design of the GZ-1 will be radically different from that of any other yet built. Along the bottom, two corridors of lattice work construction will run the entire length of the ship. Into these ‘backbones’ will be built the circular ribs, also of latticed con- struction, which will support the enve- lope. Between the ribs will be interwoven steel wire bracing, forming a network of fine wires which will add to the ship’s rigidity and hold the ribs in place. * An advantage of this corridor arrange- ment will be that it will make the interior of the bag accessible from almost any point. Thus if anything should go wrong or any break should occur while the ship was in flight, it could be remedied in- stantly, preventing the possible develop- ment of a serious weakness in the structure.” But probably the greatest factor for safety, he pointed out, lies in the fact that the control cabs all will be built as integral parts of the superstructure, mak- ing it impossible for one of them to tear loose from the ship and cause disaster, as happened in the wreck of the Shenandoah. “Engineers now are able to figure stresses so (Continued on page 128)

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36 ( Jan Yo POPULAR SCIENCE MONTHLY u Beat Them? They Star in Unusual Stunts May, 1926 Six Bull’s-Eyes a Minute Plugging the bull’s-eye 2,499 times out of 2,500 shots—and all in six and a half hours—this seventeen-year-old young: ster of Newtonville, Mass., recently hung up a new speed record for marks- manship on a fifty foot range. His name is L. Samuel Moore, and he is a cham- He Holds Six Matches on His Eyelashes In the roster of movie queens, not one has yet been found whose languorous lashes can equal those of James Strana- han, nine-year-old boy of Brookline, Mass. His eye- lashes are so long that he can hold six matches on them easily. Twelve is his record. His nearest rival is Violq Dana, the popular movie star, whose best performance is six. “That’s a cinch,” says James pion with a 22-caliber rifle. A single doubtful bull’s-eye robbed him of a per- fect score. So rapidly did he fire that his overheated rifle blistered his hands Swims with Champion at Six This little six-year-old speed marvel, Dorothy Wihr, of Chicago, can outdis- tance most women when it comes to swimming. Johnny Weissmuller, world champion, who is seen here coaching Dorothy in the crawl stroke, predicts she will break more than one world record The Highest Tee Anyone who wants to equal Theol Nelson’s thrilling stunt is welcome to try. Just stand on your hands on the edge of \ the Hotel McAlpin roof in an New York, an let Jack er Rodmond, a golfer, drive a ball off the back of your head > A Wizard Typist If you use the “‘hunt-and- peck”’ system of type- writing, you can marvel at the little nineteen-year-old English typist, Elinor Mitchell (below), who, ina recent contest, tore off 142 words a minute. She is the champion of Europe Champion Whittler at 75 At 75, Edward P. Britt, of Mattapan, Mass., defies any owner of a pocket- knife to whittle from a single pine board a longer chain, with more links in it, than he can. He claims the whittling title of New England. Some of the things he has made out of plain pine blocks include an egg in a crate, three balls in a frame, and a traffic station with a police- man inside. He is still going strong

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19% May, 1926 POPULAR SCIENCE MONTHLY 37 here Movies Get Their “‘Props” One Secret of the Films’ Realism LL the “props” the motion-picture producer needs, to make his newest picture realistic to the smallest detail, he calls upon great costume companies to supply. In their huge warehouses, they have everything that anyone might want to give a film a per- fect setting. Whether it be the elaborate costumes and gorgeous trappings for a wonderful historical production or the simple accessories of slapstick comedies, these companies have them in reserve. The pictures on this page were taken in the twelve-story building belonging to one of the great costume companies of Los Angeles. Here are some of the Indian feather head- pieces that are so necessary for the pop- ular western pictures Masks for all occasions are in great demand, and a large supply, like the one pictured above, is generally kept on hand The wonderful dis- play, above, of Ori- ental goods of all descriptions occupies a whole floor a city block in area. It contains a priceless collection ranging from Chinese idols, vases and bric-a-brac to magnificent Per- sian rugs and silken draperies. It is typi- cal of the great col- lections on which the movies may draw An enormous stock of bottles, The gruesome is also repre- with labels more or less sented in the “prop”? room. Skulls are frequently called for in medical and ghost stories, and various types are in stock .” Every prop must be exact in every detail. The picture at the right shows an expert at work closely inspecting hel- met plates for a new picture familiar in pre-Volstead days, is kept constantly replenished. They are needed especially for barroom scenes in old-time pic- tures. The attendant, seen in the above picture picking out some popular brands, is one of the busiest persons in this comprehensive establishment

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38 POPULAR SCIENCE MONTHI.Y May, 19% Odd Bits from the Records Nitrates. from Air, and Other Discovertes The contents of ten of the cars would be enough, it is said, to fill a dirigible the size of the ill-fated Shen. andoah. Should we ever have another war, these he. lium trains would become a common sight. They need careful guarding, for the gas exerts an extremely high pressure, and a heavy shock or jar would cause a terrific explosion. Chemists Solve War Mystery URING the war, the United States seized a German patent on a method of extracting nitrogen from. the air. The Muscle Shoals plant was built to make use of it ona huge scale. Nitro- Tutankhamen’s Coffin, World’s Finest Work of Ancient Art gen and hydrogen passing over hot iron prepared ina certain way, the formula MEE HE are two views of the magnificent gold coffin which actually contained the mummy of the Egyptian boy-king, Tutankhamen. Above, Howard Carter, discoverer of the tomb of the Pharaoh, is seen removing the ceremonial oils which had formed into a gummy, pitch- like substance. At the left is the coffin in all its pristine splendor after having been thoroughly cleansed. This splendid work of the ancient goldsmiths’ art was the innermost of three human-shaped coffins which fitted tightly into one another. It is more than six feet in length and is beaten out of about $250,000 worth of the finest gold bullion. It is wonderfully engraved; its filleted surface of intricate designs is inlaid with turquoise, lapis lazuli, and carnelian. Observe the neatness of design, the perfection of form that reveal the highly developed art of the ancient goldsmiths. The coffin represents the youthful king in the form of Osiris, judge of the dead, holding in his hands the whip and the crook, his body protected by the vulture deities, and his legs by the wings of the Egyptian patron goddesses. It has aroused the admi- ration of artists as well as the interest of scientists the world over said, would give ammonia. But the process didn’t work. Something had been left out of the formula by the German chemists, pur- posely. The amount of am- monia derived was too small to be worth-while. American chemists went to work to discover the missing factor. Now, after years of painstaking re- search, the Palmer Labora- tory of Princeton University POPULAR SCIENCE MONTHLY presents on these pages a symposium of some of the most recent ideas and achieve- ments of scientists that bear especially on our everyday lives. Our World Fifty Years Hence ~ ALL like to speculate about the world of the future, how we will be living fifty years from now, and how our children will live aftei we are gone. If population keeps on increasing in the United States as it has increased in the last fifty vears, there will be at the beginning of the next century 255 million people here, according to Professor Howard B. Woolston of the University of Washington. When this condition exists, people may have to be centent with tabloid flats like those being built in Vienna. With built-in, disappearing furniture, one piece of which vanishes as another comes into view, a young archi- tect there has just succeeded in putting within forty square vards a hall, .a kitchen, a sitting room, and veranda. A Canadian expert in city planning, Noulan Cauchon, gives us his idea of the city of the future. He sees city blocks of those days six-cornered instead of square. Hexagonal blocks, he says, will mean more light and air, and the zigzag streets will reduce automobile accidents. An ingenious idea for heating the houses of the future by radio has been advanced recently by Professor S. E. Dibble of the Carnegie Institute of Tech- nology. Pittsburgh, Pa. He hopes to trans- mit heat by waves just as sound is sent now. The time may come in our own lifetime, he feels. when heat for an entire city or even a whole state will be broad- cast from one great central plant. Outdoor recreation enthusiasts are ad- vocating that the government plant big forests encircling our great cities. These would provide wood, and also playgrounds for people of the cities. New Tank Car for Helium Gas HE United States Bureau of Explo- sives has recently approved a new type of tank for use on railroads in trans- ferring helium gas, one of the most valu- able substances in the world, from one base to another. The new tank has a dis- tinctive cylindrical shape, painted black. announces that if small amounts of alkaline oxides, such as sodium, potassium, and calcium, are added to the iron, the yield of ammonia is increased enough to make the process commercially valuable. Glass That Can Be Bent A glass that bends and bounces without breaking is a new Austrian invention. The photo, showing a slender rod being bent, gives an idea of the flexibility of this glass

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ed ‘a- ity all es, m, he to le. of Science May, 1926 Calculator Forecasts Success This machine, called a “‘success calculator,’”’ does involved mathematical calculations both quickly and accurately. It was invented by Stuart C. Dodd, of Princeton University. Dr. Howard McClenahan, of POPULAR SCIENCE MONTHLY Tired Metal Detected by X-Ray to Prevent Accidents “Fatigue of metals” is the cause of thousands of serious accidents every year. The metal becomes actually tired out from the constant strain, and finally snaps. To detect this strain in time to prevent trouble, X-ray photography is now employed. The picture shows Professor John T. Norton of the Massachusetts Institute of Tech- nology about to photograph through a crankcase to determine if its parts are tired of gasoline. Clearly distinguished in this way, you will use it only for fuel and not buy the lead-treated gas- oline for cleaning, in which case you might run a risk of poisoning by ab- sorbing lead through the skin. Franklin Institute, Philadelphia, shown inspecting it It is a discovery important to every citi- zen of the United States. It not only will make us independent of the nitrate fields of South America in manufacturing am- munition in time of war, but will lower the cost of foodstuffs. If nitrates can be obtained from the air on a large scale, the farmer will be able to obtain fertilizer at much lower prices than at present. Leaded Gasoline Safe ETRAETHYL leaded anti- knock fuel may now be used with perfect safety in your auto- mobile. Consternation created afew months ago, when reports of its poisonous effects caused it to be withdrawn from the mar- ket, is allayed by a report of a special committee of the United States Public Health Service which has been investigating the compound and its consequences. Two hundred and fifty two Men were examined, most of them car owners and users and garage employees in Dayton, O., some of them handling gasoline treated with the lead, and some of them untreated gasoline. The conclusions reached were that the anti-knock compound itself is dangerous in concentrated form and must be handled with great caution, but the treated gasoline is safe to handle and use as fuel. When the lead compound is again put on the market, it will be labeled ‘‘ motor fuel” instead Anti-knock fuel is the result of years of labor of American engineers and chemists. It is good to know that this im- proved fuel can be used without injury. To Study Gorillas in Africa Mr. and Mrs. Carl Akeley, noted explorers, photographed just before they sailed on their latest expedition to Africa to spend eleven months in the study of human characteristics of gorillas Total Eclipse Here in 1932 F YOU missed seeing the last total eclipse of the sun, in only six years you may have another chance. Last vear in January, when the sun’s darkening was witnessed by millions of people in the United States, we were told that the path of totality would not fall across our coun- try again for a century. Now, new cal- culations based on the most recent lunar tables show that an eclipse in 1932 will cross Canada from the northwest and go down through the New Eng- land states, passing out to the Atlantic through Massachusetts. Observations made by the ex- peditions to Sumatra recently, on the total solar eclipse, on the whole were reported satisfac- tory. Good photographs were obtained, but it will take months of study before definite results can be announced. The corona, the astronomers report, was the regular round shape. and some very large prominences were said to be visible. Why Chicks Can Walk T TAKES a baby months to learn to walk. But watch a chicken! The minute it pops out of its shell, it struts about, managing its legs without the least effort. This does not mean that new- born chickens are more intelli- gent than new-born babies. It merely indicates that balancing and standing are automatic in the chicken and not in the Baby. The latter has to use its brain to control its legs. Recent ex- periments at the University of Chicago show that the chicken’s balancing is governed by reflex action, needing no brain at all.

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40 POPULAR SCIENCE MONTHLY May, 1926 Yale Professor Clothes Ancient Fossils with Life Forms Strange Animals of the Past The ‘dire wolf” of the Stone Age, reconstructed by a remarkable new process, is shown at left as it prob- ably looked when alive; at right, in the skeleton form ECONSTRUCTED skel- etons of dinosaurs and other prehistoric ani- mals in museums give an awe- inspiring idea of size, but little else. A new and ingenious method of mounting such skeletons, devised recently by Pro- fessor Richard S. Lull of Yale University, shows how the beasts actually looked. Professor Lull’s. method makes use of incomplete fossil skeletons and defective bones. Hitherto, museums have simply imbedded these in plaster and mounted them on slabs. Professor Lull thought this wasteful, and in- vented a new way of mounting these bones, that shows on one side the skeleton structure and on the other how scientists think the animal looked in life. Since color- ing in animals varies little from one century to another, the skin is painted according to type. Skill and care are required for this restoration work. Expert knowledge is needed of the functions of the muscles and bones, in order to build up the flesh correctly. While help may be gained from study of modern animals, yet the skeletons show certain differences. An interesting example of this novel reconstruction is the “dire wolf” in the Peabody Museum at Yale in New Haven, Conn. The skeleton of this “dire wolf,” a giant relative of the modern timber wolf, was found in the Rancho la Brea tar pits, Los Angeles, Calif. In these asphalt pools animals of prehistoric days were engulfed, and died, their bones remaining to tell their fate and give a picture of their day. In the new Peabody Museum, re- cently opened to the public, is one of the finest fossil collections in the world. It has been used in an exhibition of Skeleton of a three and a half ton turtle, the largest known. evolution, in living things from one- On exhibition in the Peabody Museum of Yale University celled animals to man himself, New Powerful Swiss Narcotic Is Entirely Harmless HE invention of efficient and harm- less narcotics for anesthesia and pain alleviation is one of the most important tasks of modern medicine. Recently, Dr. Maurice Sandoz, of the University of Lausanne, Switzerland, suc- ceeded, it is claimed, in produc- ing a substance termed “‘tri- ‘aine”’ which is remarkable for its rapid narcotic effects. On cold-blooded creatures, such as fish, frogs or salamanders, two to six minutes in a one tenth percent solution of tricaine in- duces total insensibility. In this condition, the animal can be examined through the micro- scope, and the fascinating spec- tacle of the blood’s circulation watclted in all its phases. If the animal is left a few minutes longer in the narcotic solution, it becomes perfectly immovable, apparently lifeless. Wrapped up in moist cotton wool, it can be conveyed from one place to another. Immersion in ordinary water revives it imme- diately. The new nar- cotic is important in biological work in that its use permits the study of animals with- out vivisection. A solution of tricaine aga ER a diluted beyond ten per- University, examining a fish cent exerts no soporific el- which is under the influence of = fect. An injection of one cu- his mew narcotic. Above, the bic centimeter of one percent fish wrapped in gauze for Ss ; = ‘ ee handling more conveniently tricaine solution insures suffi- cient insensibility to render | minor surgical operations of one to two #/ minutes’ duration entirely painless. Tricaine, which, unlike cocaine, is said to be entirely harmless, can be adminis- tered internally in large doses to alleviate intense pain. It has also been used with success, it is said, in dentistry, a mere ex- ternal application being sufficient to make the gums so insensitive that, for instance, crowns can be fitted without any pain. ing end tall. quic ably part Nev mal port just nee! mer scie gan

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May, 1926 POPULAR SCIENCE MONTHLY Huge Girders Test Ingenuity of the Skyscraper Builders IGHT stories above New York’s busiest thoroughfare a gigantic steel girder, weighing 144 tons, swayed gently in the grip of two enormous mechanical arms. While strain- ing engines snorted, the huge metal beam slowly settled until its ends rested on the tops of two slender steel columns 120 feet tall. There, fitting perfectly to the smallest rivet hole, it was quickly bolted fast. The first of eight massive trusses—prob- ably the largest ever lifted to such a height—thus became a vital part of the steel skeleton for the Paramount building, one of New York City’s newest skyscrapers. This spectacular feat. employing a mammoth traveling platform sup- porting two towering derricks, was just one of a number of recent engi- neering and architectural achieve- ments which have add- ed new wonders to the science of erecting gi- gantic steel structures. 41 Giant Cranes in Record Feats Arms Stronger Than a Thousand Men Lifting the first of eight 144-ton steel girders into its place 120 feet high on the Paramount building. This is probably the heaviest girder ever lifted to such a height. To accomplish this extraordinary feat, two huge derricks mounted on a traveling platform were used for the work A Dome of Steel An enormous domed roof 108 feet in diameter presented a new problem of steel construc- tion which builders solved suc- cessfully in erecting the new Mecca Temple in New York Within the last year, novel departures in design have presented new problems that have taxed the resourceful- ness of engineers. In the case of the Paramount build- ing, the auditorium will be without central supporting columns. Beams and trusses must span 120 feet and at the same time support a roof and gallery. O MEET this need, the great 144-ton trusses, ach sixteen feet high, were constructed. To get an idea of the lifting power of the derricks which hoisted these trusses, consider that it would take 1,000 men, each capable of lifting 300 pounds above his head, to budge one. An equally difficult prob- lem was presented in the con- struction of the Mecca Tem- ple in New York City. In it there is a columnless auditori- um seating 5,000 persons, and also a steel domed roof 108 feet in diameter and thirty-seven feet high. Supporting this dome areasixteen steel arch ribs. Other projects include the new Madison Square Garden, with an auditorium capac- ity of 19,000, and the Level Club, which is to have an auditorium 135 feet wide four stories above the ground, supporting twelve stories above it.

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POPULAR SCIENCE MONTHLY May, 19% Stormproof Three-in-One Dirigible Invented by German NEW type of super-airship which js composed of three units, a parent ship and two smaller ships, one at each side, has been designed by Baron Boris von Loutzkov, of Berlin, a noted German aircraft and motor engineer. Its inven. tor claims that it will be absolutely storm. proof. He bases this claim on its peculiar shape, which he believes will make it lésg easily buffeted about by the elements, Its shape, he says, will also make it more manageable than a single unit. This great ship is to be fitted with powerful engines, will be capable of terrific speed, and have an enormous carrying capacity. Baron von Loutzkov’s ship is actually three ships, for each unit is separate and complete in itself, and is joined to the . others with steel cables. In case of a he ee 20 accident to one or even to two units, the inventor declares, all hands can be trans- ferred to the undamaged part by mears oe of gangplanks that run between the units, and the defective ones can be cut loose, This feature, he says, makes his ship three times as safe and _ trustworthy as an ordinary dirigible. Flying over the Top of the World Unharmed by Icy Winds In this picture the artist gives his conception, based on plans, of the new German three- unit dirigible cruising placidly and safely over the frozen stretches near the North Pole Marimba Vibrato Produced by Electric Fans OMETHING new for the _ busiest man in the orchestra—the drummer —is a steel marimba with an electrically operated vibrato. The instrument, just produced by a manufacturer of drums and percussion instruments, is being introduced in the modern orchestra and on radio programs. It is said to be easy to master, and its vibrato makes it un- necessary to roll with the hammers. Chords, arpeggios and octaves create beautiful effects, and the tone produced compares with the pipe organ, it is claimed. It has great volume and carrying power. The vibrato of the steel bars is produced by electrically con- trolled rotating fans, one in each resonator. The speed control lever on the motor enables the per- former to set the vibrato to suit George W. Marsh, drummer of Paul Whiteman’s orches- tra, playing the new type of marimba which makes it un- a necessary for the performer to roll A Storm Door froma Screen Door with hammers to pro- duce a singing tone A NEW use for snaps has beet found by a manufacturer who has applied the idea to convert screen doors . into storm doors. For the winter, a spe- cially treated covering is snapped on and the result is an excellent storm door. When spring comes, the cover- ing is removed, and the screen doot reappears. In this way the screen door caf remain up all year and at all times be protected from the weather. A small window in the storm covering allows the person inside to see who is calling before opening the door. The coyer may be attached to any screen door. the character of the number played—producing a true vor hu- mana effect in the steel marimba. The new instrument is espe- cially designed for use in accom- paniments or obbligatos in songs and modern lyric music. Vesuvius seldom sends lava flows ovet the rim of its crater; the hot liquid usually break out on its sides. ha he gi er ch m he lor cu gi po se] fai ne

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1 S 1 \- r Door been o has doors a spe- ed on storm cover- 1 door yr can nes be small allows calling : cover door. vs over liquid May, 1926 POPULAR SCIENCE MONTHLY Huge Dam to Form Mountain Lake for Water and Power REAT tracts of land in California have hitherto been unworked _ be- cause water has been lacking. This handicap of nature is being overcome, however, by irrigation from great water basins in the nearby mountains. The picture at the right shows the gigantic dam of one of these now being erected in the High Sierra mountains of California. It is called the Great Ex- chequer dam. When completed it will measure 950 feet in length and 326 feet in height, and will form a lake twelve miles long. Three hundred and eighty thousand cubic feet of concrete will go into this gigantic barrier. The water stored in this lofty reservoir will be used not only for irrigation pur- poses, but also to provide the territory it serves with electric power and _ light. Water and electricity entering the new farm lands at the same time will open a new chapter in the history of reclamation. New Oars Let Rower Face Bow O KEEP a rowboat headed for a certain point as one rows with one’s back to the bow, requires skill and con- stant turning of the head. The newly invented reversible oars, shown in the picture above, enable a rower to face the bow and row ahead as if his back were to it, or to face the stern as with ordinary oars, it is claimed. The oars will fit in any’standard oarlocks, or the device that makes them reversible may be attached to ordinary oars. A Painless Tooth Drill HE nerve-racking, painful drill that the dentist uses to bore into a throb- bing tooth will cause patients no further worry when a new type of drill récently invented in Germany comes into general use, It is asserted. The new instrument has a cocaine needle combined with a drill. The cocaine, under pressure from the dentist’s finger, flows into the hole, | a deadening the pain as the dentist drills in. The new drill has received many tests, all said to have been successful. My ony objection is that Popunar ScieNcE Monruty isn’t a weekly.—O. E. G., Durham, N. C. This Machine Cuts and Loads Corn Stalks New tractor clearing field of shocked corn r THIS mechani- cal age practically all the work in the fields can be done from the seat of a tractor or other mo- tor-driven machine. The photograph at the left shows one of the latest additions to the farmer’s machin- ery, aremarkable mo- tor contrivance that goes through a field of shocked corn, cut- ting the stalks into pieces for feed, and also loading them on the wagon. Dirty-Facep stone buildings now can be steam cleaned so that they look almost as good as new. In a series of tests recently conducted by the United States Bureau of Standards, live steam cleaning was first tried successfully on dirty stones in the laboratory, and then on a twenty- year-old accumulation of dirt on an old bank building in Baltimore. How Much Do YOU Know About Science? OW many of the following questions can you answer? Here is a real test of what you actually know about the phe- nomena of nature vou are witness- ing every day. None of the ques- tions is hard, and all concern things you ought to know. Try off- hand to answer them, and then turn to page.143 for the correct answers to see how near right you were. 1. Why does fast music make you feel more active? 2. How did ancient surgeons produce anaesthesia for operations? What is distilled water? How do we know that the sun rotates on its axis? Does the sun affect the tides? 6. Why can you beat up white of egg into a froth though you cannot do this with water? 7. What makes the undertow at the sea beach? 8. How does a caterpillar turn into a butterfly? 9. How do bacteria assist in the manufacture of linen? Why does salt make us thirsty? rm Ww on 10.

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POPULAR SCIENCE MONTHLY May, 192% Mai The Tippiest Grand Stand The oddest way yet devised for “‘seeing New York” is to balance yourself on two legs of a chair atop a skyscraper. Johnny Reynolds, noted daredevil, recently did that very thing on this dizzy roof, proving himself to be a decidedly weli-balanced gentleman A Hard-Wear Dress Miss Mary Tidwell of Tampa, Fla., has set the most unusual fashion. She wears a dress of screen wire fringed with bottle brushes. Skirt decorations are pot racks, while locket and necklace are a padlock and dog chain. The hat is a strainer, trimmed to mode » The Curious Unusual People, Odd Sights, Where Old Cars End One of the strangest things about the nineteen-odd mil- lion automobiles in the United States is where they all go when worn out. One answer is found in the re. markable picture at the left, This huge “bone heap” of old cars was photographed at Salt Lake City, Utah. The metal is salvaged, and the rest goes up in smoke They’re All Birds The island of San Martin, off southern Peru, has the most extraordinary popu- lation on earth. It con- sists chiefly of Guanayes birds—hundreds of thou- sands of them. Man and animal have hardly elbow room, as you can _ see Dog Locomotives The only railroad operated entirely by dog power runs northward from Nome for ninety miles. It is known as the Dogmobile Road. Eight dogs can haul a quarter of a ton of freight from forty to fifty miles a day, and seemingly enjoy it

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926 May, 1926 Side of Lhings POPULAR SCIENCE MONTHLY and Out-of-the-Way Places Crash! Anyone can dive through a plate glass window—if he wishes. But! how many could make the plunge at sixty miles an hour and come through with only two small scratch- es? Such is the re- markable feat of Harry Lorraine, English daredevil motorcyclist. The upper picture has him at the moment he crashed through the glass obstacle * Z After the crash—the glass smasher and his motorcycle. Notice that his only head protection was the felt hat shown They Roll through ‘Here Comes School’’ That’s what children of Oakland, Calif., say as they see a strange schoolhouse on wheels towed down the street by a motor truck and anchored on a vacant lot Life in a Barrel Never was there a stranger home, nor one quite so upsetting, as that of the brothers Feldgren, who are rolling their way around Ger- ee ge 46 many ina barrel to pay a bet. This picture shows them making their morning toilet in Berlin, where the police arrested them, then let them roll away in their unique car Living Fireworks An unusual Fourth of July novelty promised for this year is animated fireworks. Spectators, will see human figures, illumined in fire, stage boxing matches and per- form other antics. The actors wear asbestos suits (left) filled with fireworks, producing the spectacular effect below XN World’s Largest Checkerboard Now the time-honored game of checkers as- sumes its place with golf as a mild form of exercise in Clearwater, Fla., where the huge squared “board” shown at the left has been laid out in black and white cement on the pavement. Here old-timers match their wits, playing cham- pionship matches with large flat disks which they push about with rods. Whose move is it?

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POPULAR SCIENCE MONTHLY “Cold Light” Obtained with Liquid Lens IGHT without heat, or “cold light,” is obtained with a “liquid lens,” by three Massachu- setts inventors. Light that un- filtered would burn the skin or ruin the eyesight, now can be approached without injury, it is claimed. Various _ liquids are used for the lens, but the commonest is copper sulphate glycerine. It has been adapted to ul- tra-violet ray treat- ~ The inventors of the “liquid lens,’ holding and gazing into a powerful light made “‘cold,”’ and consequently safe, by their device ments and motion- picture apparatus. Women Skilful at Electrical Work EFT fingers that handle del- icate objects with skill and speed have helped women to get unusual jobs in many electrical manufacturing plants. In the Western Electric Company, scores of women are employed in making, inspecting, and assembling parts. Some make the diamond-dies used in drawing the finer sizes of wire. Others attach the filaments in tiny lamps used on telephone switchboards. These filaments are about one sixteenth the diam- eter of a human hair, and the work on them has to be done under microscopes. Splitting sheets of mica to .0008 of an inch thick, or flimsier than the thinnest gold leaf, is another job that has been entrusted to the light touch of women’s fingers. Women are also employed to wind coils and op- erate presses. At the right, a girl expert is shown as- sembling cables on a local switchboard. Door Knob Turned by Foot F YOU have ever tried to open a door while your arms” or hands were full, you will look with favor on a new in- vention that en- ables one to open a door without grasping the knob. Stepping on a foot trip automatically turns the knob, and a slight push opens the door. The device, which fits on any door, consists of a chain attached from the door knob to a small foot trip fastened on the bottom of the door. When this trip is pressed down with the foot, the chain turns the door knob. The new device, in making the opening of the door easier, will also put an end to kicking and denting the bottom of the door to call someone inside. Chain Turns the Knob Her light fingers make it possible for this girl to as- semble switchboard cables May, 19% Lock Has 1024 Combinations HIS new lock has no key, but is said to fasten more securely than one with a key. That means the owner, who knows the combination, need have no worry about his key. As long as he remembers the combination, which he has chosen himself, he can open the lock. The combination is controlled by a series of ten rings contained within the pad- lock and capable of 1024 combinations, of which the owner may take his choice, The combination may be changed at any time. Since it is worked by touch, the lock after a little practice may be opened quickly in the dark. Tailors’ Dummies Move Heads UMMIES that move their heads, lips, and eyes by means of electric motors concealed within them, have been devised by Paris tailors to make their models lifelike. The faces of the dummies are made of a new substance called staff. This is a mixture of fiber and plaster that is said to be far less brittle than the usual wax and to make possible more natural coloring. Discarded Grindstones Make Fine Walls Trwad use for old, worn-out grind- stones has been discovered by a large Philadelphia hardware manufacturing concern. They ‘make excellent wails, either in their original shape or cut into blocks. Broken up, they are excellent for road-beds. ° A wall several blocks long, around two sides of the 65-acre tract occupied by this factory, is built of these stones. A third side, along the Delaware river, has a massive retaining wall also of grindstones. Still more grindstones were used to build a large church nearby. More than 2,500 of the grindstones were used in build- ing the church, while many thousands went into the wall around the plant and the retaining wall on the river front. In the retaining wall, the stones were used just as they were discarded from the factory, but for the wall around the plant and for the church the stones were care- fully squared. No one looking at church or wall ever would imagine that they were built of grindstones. Old grindstones also have been used as the foundation for roads about the factory. Looking at the wall above, one would mever suspect it is made of grindstones cut up into blocks as shown at the left Pe sand tl ec DI

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nt May, 1926 A Swing That Children Can Push Themselves NEW push-yourself swing is de- lighting small children who want to swing when there aren’t any grown-ups or other children around to give them a boost. Children as young as two and one half years can use it. It has a seat like a kiddie car, a handlebar, and a rest for the feet. Pushing alternately with the feet and hands makes it go. The swing may be attached on the porch or indoors in attic or basement, wherever the ropes can be fastened in- dependently. For the lawn, the frame shown in the photograph above is used. SELF-STARTING foghorns that begin to blow whenever a thick mist gathers have been invented in France. The device is set in motion by the action of the damp air on calcium carbide. It has been suc- cessfully tested, it is said, in several French ports where fogs are frequent. . POPULAR SCIENCE MONTHLY times a nuisance. Besides this, the new instru- ment amplifies the voice of the speaker at the other end of the line, thus helping to relieve the strain of listening, and also allow- ing a third party to listen in on a conversation, if it is so desired. Its greatest benefit, perhaps, is that it allows a person to keep on with his work while he is holding the wire for his connection. A great amount of time can thus be saved in business hours. The audiophone is at- tached to the inverted receiver, and requires no change in the telephone. The receiver hook is controlled by a lever, which is clamped around the post and raises the hook and _ receiver for an incoming or outgoing call. Free Shade Provided for Automobilists UTOMOBILE gasoline and _ service stations have been giving free air these many years. But now comes a considerate gas station proprietor who is providing free shade for tired, sweltering motorists. Out in the West, where trees are few and far between, this service is sure to be appreciated. The shed, with its sign of invitation, shown in the picture below, was erected in Bradley, Calif., and is giving relief daily to hundreds of grateful, jaded patrons. PRES OE eee i: (27 x uct eae ae This ‘‘free shade’’ station offers welcome relief to motorists on sun-baked roads Work While You Telephone OLDING the receiver close to the ear while using the telephone is often tiresome, and at A new telephone device, known as the audiophone, eliminates the necessity of holding the receiver during telephone conver- sations, and leaves both hands entirely free. 47 Your telephone receiver stays on the hook while the telephone ‘is in use with this new device Measures High Temperatures a. recording 1800 degrees, or nearly twice as many as can be registered on any mercury ther- mometer, has been devised. The tube is of clear fused quartz and is filled with gallium, a rare metal with high boiling point which has never before had any practical application. Thermo-couples, up to the present, had to be used to measure temperatures higher than those recorded by mercury thermom- eters, but it took an engineer or a chemist to operate these. The new instrument, developed by the research laboratory of the General Electric Company, can be used by anyone. It is shown at the left. A reEcorp for comets discovered was made in 1925, during which eleven were noted by astronomers in various parts of the world. Some were hitherto unknown, while others were historic visitors return- ing for their periodic appearances. The nearest approach to this record in recent years was in 1921, when seven were found. Grass Catcher Fills Evenly O GIVE the cutting effect of a scis- sors, the revolving knives of lawn- mowers are set at an angle of about 20° with the fixed blade. This re- sults in the cut- tings all being thrown to one side or the other of thegrass catch- er, instead of be- ing evenly dis- tributed. The grass catcher illustrat- ed here is pitched at an angle, and lies directly in the path of the falling grass. None is spilled, and the catcher is filled uniform- ly. A partition inclined toward the front keeps grass from push- ing out again after it is once caught.

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He stands seven icet four in his stockings Young Giant Engineer Runs Miniature Train HE interesting photograph above shows the youngest and tallest loco- motive engineer, Jack Farl, of Venice, Calif., and the smallest engine on the Pacific coast. Jack and the en- gine which he runs are among the principal attractions of Venice. The contrast, as seen in the picture, is / amusing. ©. Jack, who is only fifteen years old, “~~ stands seven feet four inches in his stocking feet and weighs 237 pounds. He is still growing. The longest over- alls he could find were more than a foot too short, so he had to have pieces added to the bottoms of the legs. If you look closely at the pic- ture you can see the seam in them. POPULAR SCIENCE MONTHLY May, 1926 Interesting People: America’s Youngest Pilot HE youngest licensed air pilot in the United States is said to be Farman Parker, fourteen years old, of Anderson, Ind., who recently passed the necessary tests with dis- tinction. He has been flying for many years with his father, who is a pioneer aviator, and had no difficulty in obtaining a license. Farman was born in St. Paul, Minn., but has lived most of his life in Indiana. The picture at the right shows the young avia- tor standing in front of the plane that he uses in making his flights. AN ELEPHANT’S tusk filled with gold was discovered recently by a group of explor- ers in Alaska. During the centuries the tusk became buried and fossilized and_ gold nuggets were imbed- ded in the ivory. The tusk weighed 250 Ibs. **Red’’? Smith turning a bat handle detail. Yet for all the care in Fine Violins Made in Home Workshops ARGE factories turn out every year as the one seen in the picture below. thousands of violins made of the There all the parts are fashioned and finest woods, thorough!y seasoned, exact put together by hand with all the patience replicas of the old masterpieces in every and care of the old masters. Old Baseball Star Makes His Own Bats AST year “Red” (J. Carlisle) Smith, former National League baseball star, led the Southern League in batting. This year he hopes to repeat with bats of his own making. In the picture at the left he is turning a bat handle on a lathe under the guidance of C. M. Hughes, a noted bat maker of the South, at Atlanta, Ga. “Red” was the star third baseman of the sensational Boston Braves in 1914 when they walked off with the World’s Series four games straight. He has been out of the major leagues for some years, but is still going strong in the minors. Grafts New Eyes on Animals ee several years’ experiments, Professor E. Guyenot of the Uni- versity of Geneva has succeeded in creat- ing sight in animals and hopes soon to extend his work to human beings. He chose tritons as the subjects their manufacture, they fail to approach in quality the fine old instruments of Strad- ivarius, Amati, Guarnerius, and the other great masters of the Cremona school. When the old masters died, the secrets for the production of these wonderful violins died with them, but certain of the traditions of fine violin mak- ing have lived on and still flourish at Mirecourt, France, which is now the violin cen- ter of. the world. The Mirecourt violins, which are the nearest rivals of the old master instruments, are made not in large factories of his important experiments. The optic nerves of the tritons were cut and the eyes extracted. Then, after a certain period, he grafted new eyes iri the orbits of the original ones. In eighty-four cases he has worked on dur- ing the past eleven months, only three have been com- plete successes, but these three prove conclusively, he claims, that he is on the right track. oe Grafting eyes on inierlor vertebrates, he says, is not more difficult than grafting heads, tails or Iegs on them, since it is possible to renew but in home workshops such Making violins in a home workshop at Mirecourt, France a connection with the brain. ee a ee rs

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h, all 2. of at on . he in he it. ng Sy Li- t- to Te at he es & A. ur r- n- se he he May, 1926 Their Unusual Jobs He Made This Tractor Himself HOMEMADE tractor of novel con- struction is the proud possession of G. F. Erikson, a pumping station engi- neer of Bowdle, S. Dak. With the excep- tion of the engine and the transmission, it is entirely his own work. The power for the tractor is furnished by two Model T Ford engines which he has connected tandem fashion, so that the single crankshaft receives two im- pulses on each revolution. The wheels, frame, drive pinion, ring gear, and all the other parts of the tractor Erikson made himself in his home workshop, where he works evenings, when his day’s work at the pumping station is over. In the picture at the right, Erikson is seen proudly driving his odd-looking but efficient tractor out of the shed. y Music Lesson atop a Bridge AKING chances is not confined to any one class of workers. The pic- ture above shows Ross Gorman, a New York saxophone teacher, giving at the risk of his life a lesson to August Sarentino, a painter, high up on Brook- lyn Bridge, New York City, where Sarentino is working. _ Perched high on the sway- ing cables, Sarentino runs his scales while the teacher holds music for him. The lessons are given during the pupil’s lunch hour, and to save time the teacher climbs up the rigging to the place where Sarentino is painting. Apartment house dwellers who have to suffer from be- ginners’ efforts on musical in- struments will approve heart- ily of the idea. If one must learn to play a saxophone, it is hard to imagine a better place to practice, say they, than on a high bridge. POPULAR SCIENCE MONTHLY 49 Noted Potter Fires Kiln Only Once a Year HAT Wedgwood is to chinaware, that Delaherche is to pottery, the finest of its kind. The French pottery is remarkable for its wonderful glaze, its perfect shape, and its exquisite coloring. Comparatively rare, it is much sought after by collectors, and is and the master potter of the world. But he is something of a philosopher, too, and many visitors seek him out to listen to his shrewd remarks, based upon years of observation and sound thinking. accordingly high priced. While many know and admire this pottery, few know anything of its maker and its manufacture. It is made by Auguste Delaherche, an old Frenchman who lives at Armentiéres near the town of Beauvais, famous for its tapes- tries. All his pottery is made from clay that he digs in his own gar- den. And he has ideas of his own about his: work. Throughout the year he makes a considerable number of objects, each unique in its way, but he fires only once a year. At this time he stands by the kiln for thirty hours without sleep, to be sure of an even heat. Even heat, he says, is the secret of the won- derful glaze that makes his work stand out from all others. Delaherche is shown in the pic- ture at the right sitting in front of his kiln. Because of his high proficiency, he has been called the Della Robbia of the century, J. C. Pakin making a speaker's gavel Capitol Gavel Maker Busy When Con¢gress Meets OR twenty years, J. C. Pakin has been official gavel maker of the Capitol at Washington. During that period he has made all the wooden mallets used by the presiding officers of the Senate and the House of Representatives. Although the gavels are made of the most durable wood obtainable, in the excitement of debate they frequently are broken in the speaker’s endeavors to re- store order, and the gavel maker is usually pretty busy keeping a sufficient reserve supply on hand. In the photo- graph Pakin is shown working on a new gavel head, which he is turning on his lathe.

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POPULAR SCIENCE MONTHLY May, 192% Making History in the Art | To London in 18 Hours in New Plane Above is an artist’s conception of a great passenger and freight airplane whizzing past an ocean liner as it speeds across the ocean. Yet it is not a mere product of the artist’s imagination. It is inspired by plans for a monster monotriplane, capable, it is claimed, of flying from New York to London in eighteen hours, designed by Dr. Armin de Muth, a German inventor. Models of the plane have been tested by Professor Edward P. Warner of the Massachusetts Institute of Technology. Dr. de Muth’s plane, which is soon to be constructed, will be all metal and The small bombs, above, unsinkable. Its length will be 147 feet, and it will have a are carried under the catrying capacity of fifty passengers and two tons of freight planes and are released by springs when desired C2... ee Army Tests Its Bombers At the recent target practice at Mather Field, Calif., army bombing planes made some marvelously accurate shots from very great heights. Perfect hits, such as the one shown above, were made with surprising frequency Ship a Complete Flying Field The queer-looking ship at the left is the giant aircraft carrier, H. M. S. Furious, mother ship of the scout planes of the British Atlantic fleet. It has a high and very wide deck that forms a large flying field, and beneath this are hangars where planes are stored and repaired. The vessel has a crew of 890 officers and men

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1926 eld, yme eat wn ncy raft out and and and May, 1926 of Aeronautics Lester P. Barlow, of Connecticut, with the two types of bombs he has invented >, POPULAR SCIENCE MONTHLY Novel Air Bombs of Huge Size A new torpedo for bomb- ing planes, said to have a capacity of two tons of explosives and a range of 1,000 miles, has been in- vented by Lester P. Bar- low of Stamford, Conn., who specializes in air bombs. He has of- fered Congress a torpedo in which gas for the carrier plane may be stored withsafety Uncle Sam’s New Bombers Made for Speed A dozen new, light, bombing planes, embodying features far in advance of those now in use, are being built for the United States by the Huff- Deland Airplane Company, at Bristol, Pa. These planes will have a speed of more than 135 miles an hour and have been given the class name of “Pe- gasus.”’ The pilot’s cockpit of one of these new bombers is shown below, without the outer housing that will hide its metal frame and complicated system of controls when it is finally completed Builder of New Speed Planes 51 She Changes Planes in Air for Thrill Miss Gladys Engle, Don MacDougall, and Art Go- bel, who do aerial stunts for the thrill of it, recently had all Los Angeles gazing up into the sky spellbound, as they performed their daring feats high above the city. Miss Engle made the spectators gasp as she coolly climbed from one plane to another. The pic- ture above shows the two planes and Miss Engle as she was about to make her thrilling change. At the left, a close-up shows the daring flier poised to catch hold of the second plane Thomas H. Huff, whose picture appears above, is the president of the Huff-Deland Airplane Company of Bristol, Pa., to which Uncle Sam has entrusted the construction of all the new light bombers of the speedy ‘‘Pegasus”’ type

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ree James R. Gillen with an eagle captured in the Pennsylvania mountains after a storm FTER arecent storm James R. Gillen, of Ambler, Pa., found an American golden eagle near Fort Washington, al- most dead of exhaustion from battling the elements. It was too weak to resist, and Gillen took it home. The bird has now fully recovered but is still in captivity. It is not yet full grown, but it has a total wing spread of fully six feet four inches. POPULAR SCIENCE MONTHLY May, 192% When the American Eagle Is Captured Two fine specimens of American eagles, and the four Utah National Guard officers who caught them in the mountains of Utah. Note especially the magnificent spread of their great wings Officers of the Utah National Guard tramping through the mountains near Bountiful, Utah, discovered two American eagles on a ledge. Stealing up on them, they seized the great birds before they could get away. The struggle that en- sued was lengthy and fierce. The eagles fought with beaks and talons and were subdued only when completely exhausted. The officers were bitten and scratched, and their clothes were in rib- bons when the battle was over. Although captives, there is still fight in the birds, as the picture shows. Strawberry Patch in a Barrel TRAWBERRIES enough to supply a family for a season can be grown in a barrel. This has been demonstrated by Delavan D. Johnson, of California, as shown at the right. A barrel in which holes of sufficient size for a strawberry plant have been bored, is filled with dirt. In each of the holes a vine is set, and under each vine is built a screen platform to sup- port it as it grows and bears fruit. The barrel is set on a platform some dis- tance from the ground, to make stoop- ing unnecessary. As many as sixty vines can be raised in one barrel. By this method hundreds of vines can be cultivated in a restricted area. The berries are said to be better, too, because they get more sun and air and are not so cramped as when they grow on the ground. A highly productive bed of strawberries is grown in this strange barrel garden Three of These Texas Lemons an Armful GALLON of juice to a lemon! That is the way they figure for lemonade in the lower Rio Grande valley, Tex- as. This is, of course, an exaggeration. But you may not think it very much out of the way when you note the size of the lemons. Three of them make an armful, as may be observed in the picture. These lemons were part of a display of Texas agricultural products held recently in Kansas City, Mo. The name of the fruit is “Pondero- Lemons as big as grapefruit, called “‘Ponderosas,’”’ as shown above, are raised in the lower Rio Grande valley in Texas sa,” or, translated into plain English, ponderous. Blame Snails’ Sweet Tooth SMALL snail causes the root- rot disease, which has almost wrecked the sugar growing industry of Louisiana, the United States Depart- ment of Agriculture has announced. As many as 150 of these little snails have been counted about the roots of a single plant. In their attack they leave cavities which are invaded by micro-organisms from the soil. **13”’ His-Lucky Number ‘ IVE me the thirteen every time,” says B. A. McGoldrick, lumber manufacturer, of Spokane, Wash., who deciares this number the luckiest he ever had. If he failed to get an auto license without a 13 in it, he would be greatly disappointed. For the last six years he has had the number 13,000, and in all that time he hasn’t been arrested or had an accident. He carries the six numbers in a special frame in front of his radiator. ‘ 1 € 13000 ce The hood of the automobile of B. A. McGoldrick, who believes in number 13

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> 19% ilons etely and rib- ht in Ith root- nost ry of yart- ced. nails oots tack ided i iber who ever ense atly ; he all had bers tor. May, 1926 Miss Nellie Isaac making mosaics from egg shells by her newly discovered process KILLED workers, notably of China, Japan, Germany, and Italy, for cen- turies have employed sea shells in making odd and intricate ornaments. But for the first time, it is believed, hen’s egg shells have been successfully used for a similar purpose. After examining some specimens of the older shell work, Miss Nellie Isaac, a New York artist, was struck with the possi- bilities of the humble egg shell. She tried out her idea, and the result is a new craft —egg shell mosaics for the backs of brushes, for combs, powder boxes, pin trays, and mirror frames. POPULAR SCIENCE MONTHLY Girl Artist Fashions Mosaics from Eg¢ Shells 53 i How the selected pieces of shell are arranged according to a chosen design and are glued to an article by skilful hands. The shells are broken into small pieces which are carefully fitted together ac- cording to the desired design, and are then glued on to the article to be deco- Cleaning and breaking up the shells, the first step in the making of egg shell mosaics rated. The utmost care is necessary in the handling. When the glue has dried, the shells are painted in various colors. The surface of the finished egg mosaic is smooth and does not chip easily, making it almost as serviceable as the sea shell mosaic. Srx CABLEs are to be strung across a span of 6,240 feet, or nearly a mile and a quar- ter, to carry power across an arm of Puget sound into the city of Tacoma. How You Can Grow a Pearl - IS possible for anyone to grow pearls such as the Japanese have succeeded inproducing. Charles L. Edwards showed his nature study classes in the Los An- ‘geles public schools how to do it. He put a hard bead in an abalone shell and then left the mollusk alone. When he opened the shell, the bead was not to be seen. Instead, stuck to one wall of the shell was a pearl that the abalone had formed by covering the irritating bead with layers of pearl film, its own protec- tive secretions. A pearl stuck to the shell in this way is called a blister pearl. It is generally set in jewelry with one side flat, but it can be peeled like an onion to make it round. In doing this, however, its size is some- what reduced. ; The peari on the shell, pointed out in the Picture, was formed around a small bead Postage Stamps Make Colorful Bedroom Set ANCELED postage stamps have been put to many uses in the past, but Mrs. Josephine Farrell, of Winthrop, Mass., now has found a way of employing them that is both novel and artistic. She has used them to decorate a set of wooden bedroom furniture. Thousands of stamps of all denominations went into the clever and greatly varied designs, and the gay colors of the stamps produce a striking effect, as seen in the photograph. Collectors have shown much interest in the furniture and have made many tempting offers for it. Henry Ford is reported to be one of those who have tried to purchase it. Two Missouri farmers were startled re- cently by a meteor that landed only 300 yards from them. The meteor made a hole in the ground four feet in diameter. Ideal Optical Glass Produced PERFECT optical glass, free from all flaws that are sometimes found in optical glasses, has been produced at the United States Bureau of Standards where it is now on exhibition. The watch in the illustration was photographed through four inches of this glass, but every detail is as perfect as if there were no glass be- tween it and the camera. There are none of the usual distortions caused by flaws or scratches. In the original photograph, even the smallest divisions of the dial stand out with absolute distinctness. The piece of glass, through which the watch was photographed as shown above, is four inches thick and absolutely clear and perfect

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54 POPULAR SCIENCE MONTHLY How a Great City Protects Its HOOD HE AMOUNT of food consumed in New York City in a single year would fill a freight train extending from Havana, Cuba, to Alaska! With its population of nearly 6,000,- 000 residents and—to follow a very conservative estimate—of 1,000,000 commuters, every day at lunch time 7,000,000 persons are eating in the largest city in’ our country. Fifteen thousand restaurants serve 3,000,000 persons daily.. These figures give but a slight idea of the vast May, 1926 May, quantities of food New York City needs, and the ( herculean task it faces to safeguard that supply. In a greater or lesser degree the same problems confront every city in the country. From the time it gets to the terminals until it reaches the table, food in the giant metropolis is closely scrutinized by an army of inspectors. | They board the trains at the stations and the ships at the piers. They follow it through from the wholesale markets, to retail éstablishments, pushcarts, bakeries and restaurants. For some foods, such as milk, and some kinds of shell fish, the inspection begins outside the city. A net of inspectors is spread through nearby states, examining foods at their sources. Last year these inspectors condemned food enough to fill a train of cars four miles long. Spoiled, adulterated, and poisonous foods are quickly discovered by the keen-eyed, vigilant health guardians. All doubtful foodstuffs are analyzed in two municipal laboratories, one for detecting im- purities and adulteration, the other for ex- amining milk. Both are maintained by the city under its bureau of food and drugs. He Guards the Milk of New York’s Millions Determining the percentage of fat in a milk sample in the fig milk laboratory of the New & York bureau of food and drugs. Protecting the people from impure milk is perhaps the city’s biggest task. About 3,500,000 quarts of milk are consumed daily in New York Wood Alcohol Menace The photograph above, taken in the chemical laboratory of New York’s health department, shows a chemist testing liq- uors for wood alcohol | ae a with an immersion i — refractometer. In é 4 %s these days wood al- 71s £ cohol has become a . } , 2 constant menace,and £ a rp | every effort is made to guard against it Tasting Butter * The purity of butter is decided by taste and odor. Dr. M. A. Herzog of the health depart- ment, above, is tasting butter before printing and wrapping Eggs Must Be Candled New York consumes 55,000,- 000 dozens of fresh and storage eggs yearly. Be- sides these, other millions of frozen and powdered eggs are used for baking. More than a million pounds of frozen yolks and whites come into the city every year from China alone. These are tested by smell and taste, while the whole eggs are carefully candled. The pic- ture above gives an idea of how eggs are candled Ice-Cream Weighed New Yorkers eat 15,000,000 gallons of ice-cream a year, Or two and a half gallons per person. The fat content for all this ice-cream must be at least eight percent. At left, an assistant in the municipal milk laboratory is shown weigh- ing a sample of ice-cream

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y, 1926 ) New ill a ‘uba, 00,- itive y at the sand vast the ply. lems sil it is is ors. the rom nts, »yme hell .A rby ood ng. are ant WO m- eX- the a SOY May, 1926 POPULAR SCIENCE MONTHLY Boats for Land and Water Hailf-a- Dozen Ingenious New Travel Ideas a * Takes Visitors Out to Big Boats This motor boat, called the Walrus, is equipped with a Ford engine and is equally at home on land or in the water. It carries passengers from the beach at Scar- borough, England, to larger boats in the harbor that take excursionists for a sail 55 Sightseeing Motor Launch The large motor boat coming up the beach, above, with a party of sightseers, is one of the attractions of Skegness, England. It runs onits own power on land and in water, and takes visitors along the beach and out on the sea Complete Boat on Auto Chassis The boat, on the right, beginning to ascend the shore, is an in- genious combination of a specially designed boat body and the chassis of a low priced automobile. A _ lever changes from propeller to automobile trans- mission. It was de- signed by an Austrian A Tricycle Boat Dashing into the water, below, is a novel Ger- man tricycle boat that tuns as well on land as in water. It is pro- pelled by foot power, and is sufficiently large to carry four passen- gers besides the driver JF 4 ¢ ee 4 f OL \ e /i ‘ keg é fof : enh / H ode. sect : see — oo f :; ni’ A Bicycle Runs This French Boat The small boat above is built around a bicycle which furnishes propelling power for both land and water. Its inventor, Marius Handy Combination for Campers The sidecar of the motorcycle above is a complete motor Gallee, a French tourist, can be seen here starting on a jaunt in it from Paris to Amsterdam, Holland boat that can be detached easily from the motorcycle. It was recently put on exhibition at the Motorcycle Show held in the new Madison Square Garden, in New York City

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POPULAR SCIENCE MONTHLY hought Messages Stir A Thousand Persons May Hear Man’s Heartbeats with New Device It is possible, it is claimed, for as many as a thousand persons to listen to a man’s heartbeats trans- mitted by a stethoscope, with a new device recently invented by engineers of the Bell Telephone Lab- oratories, New York. The photograph shows H. Clyde Snook, of the Bell laboratories, holding the stethoscope transmitter to a subject while three New York radio and electrical engineers listen in Knowledge of the latest advances of science is one of the greatest assets of the mind. It develops depth of thought and breadth of vision. In its applica- tion to daily life, it is of immense value. In these columns we endeavor to give you each month brief accounts of the latest scientific discoveries that may be of practical service to you. ELEPATHY soon may be added to radio, telephone, and telegraph as a means of communication with daily. In Paris, the distant persons. Notable progress has powerful light is be- been reported by Professor Vladimir ing used now to Behterev of Leningrad Academy of Sci- _ bring out texts that ences, Russia, who, by capturing the have been erased electromagnetic waves thrown off by from old _parch- people, claims to have succeeded in trans- ments, Even though mitting thoughts. the parchment has Dr. Ivan Chakhovsky, a Moscow phy- been written over sician who took part in Professor Behte- again, it is said, the rev’s experiments, substantiates this original letters will claim, and declares that in seventy per- come out. Very in- cent of the cases Behterev was successful. _ teresting discoveries Professor Behterev’s is the third an- _ of old classics are ex- nouncement from Russia recently on pected to be made telepathy. In 1925, Professor Skripsky under this _ treat- of the Leningrad Electro-Technical Insti- ment. tute told of an invention to determine The Maine Agri- everybody’s “electric characteristics” by cultural Experiment recording human electromagnetic waves. Station recently has Early this year, Dr. Koshinsky of Mos- been giving cows a cow claimed .to have transferred human daily bath of ultra- thoughts from one person to another. violet light from ar- American psychologists are for the most _ tificial lights. The part skeptical of these claims. Some reject milk that these cows them entirely. Dr. J. McKeen Cattell, give, it has been formerly of Columbia University, and found,prevents rick- received $800,000 for psychic research, recently declared, after 10,000 attempts, that telepathy is impossible. New Uses for Ultra-Violet Rays EW uses for ultra-violet light, that invisible part of sunlight whose magic effects on health were discovered only recently, are being found almost May, 1926 Contro VErsy Progress of Science at Home and Abroad In the summertime, cows out in the pas- ture get their doses of ultra-violet light from sunshine, but in winter stables this is denied them. The time appears near at hand when every stable will be provided with artificial sunlight for the long, cheerless winter days. A Lead Cancer Cure EW hope has been given recently to sufferers from cancer. A distin- guished English surgeon, Dr. W. Blair Bell, claims that he has been able to cure the dreaded’ disease with injections of lead.. A professor at the University of Liverpool, Dr. Bell has been testing out this method for seventeen years. The metal is injected into the veins near the cancerous growth. Out of about 200 cases treated, most of them thought hopeless, Dr. Bell declares that almost fifty are now believed to be entirely and permanently cured. A Novel Way of Keeping Fruit N ENTIRELY new way of keeping fruit from spoiling has been found by Professor John McLean Thompson of the University of Liverpool, England. He puts the fruit to sleep, he declares, in which state they breathe very slightly and keep perfectly for a long time. The fruit is put in a room and kept at a steady temperature and degree of Dr. Edward L. Thorndike of Teachers College, New York, doubt the success of the Russian experiments. Professor Cou- vel, head of the psychology department of Stanford University, which 'six years ago ets in babies, while milk from cows not getting treatment is useless in pre- venting the disease. Vibrations to Be Firemen of the Future? Fires in the future will be put out by tone vibrations, according to Charles Kellogg, a California naturalist, who is showing New York firemen how it can be done. Each building, he says, will have its own pitch, and the vibrations produced by a “tuning-in” process will extinguish the fire wo ~~ oO

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it yf May, 1926 Relics of Ancient Babylon Above, Miss Grace Stockman, of the Smith- sonian Institution, Washington, D. C., is ex- amining three inscribed clay disks dug up in ancient Erech, Babylon. The largest contains a schoolboy’s exercise; the small ones are bills of sales for goats. They are about 4,000 years old humidity until it becomes dormant. Then it can be kept anywhere. The method has been tried on oranges, nuts, grapefruit, lemons, and apples. If further tests prove successful, we may see on our fruitstands strange trop- ical and oriental fruit that never reached our country before on account of the pro- hibitive cost of cold storage shipping. Blackbird Best Singer of Tribe N A singing contest between birds, the blackbird would win, said Professor C. J. Patten of the Royal Institution, London. For the blackbird keeps the best time and rhythm, and his song has the best tune. A thrush, however, could beat him in endurance, some thrushes being able to sing sixteen hours a day. Birds have three kinds of language,. the professor says—alarm notes, call notes, and song. Alarm notes are for trouble, while call notes are used by young birds crying for their parents or by older birds when mating. Songs that we think are expressing joy, this bird specialist says, actually are not. Most birds really are saying, “Look at me—how big I am — how beautiful I am—I’m a very fine fel- low”; in short, the songs are expressions of pride. In tHE laboratories of Princeton University, a new way has been found to make hydrogen peroxide by combining hydrogen and oxygen directly. Shortening the process will mean cheap- er antiseptics and _ per- haps cheaper dress goods, Since hydrogen peroxide 18 one of the most impor- tant bleaching agents. POPULAR SCIENCE MONTHLY France Leads in Flying Records RANCE leads the world in aviation, having forty-five world’s records. The United States comes next with thirty-three, with Italy third and Den- mark and Holland tying for fourth place. These figures are given in a new chart published by the French air ministry. Lucien Boussoutrot, a French airplane pilot, recently made a world’s record for altitude and duration of flight with heavy loads. Carrying a weight of over six tons, equal to that of sixty passengers and baggage, he rose 11,482 feet in fifty-five minutes and remained up one_ hour, twelve minutes and twenty-one seconds. In this flight Boussoutrot broke eight previous records, seven of which he him- self had made previously. Men Think Better under Strain OUR easy-going, pleasant fellow isn’t going to get there as fast as the man who grits his teeth, knits his brows and holds his’ muscles tense. A series of psychological tests was tried on persons while they were gripping a dynamometer, a pair of hand grips with meter attached, and then repeated when the subjects were sitting in relaxed positions. The results showed that the per- sons: could think much better and faster when their muscles were under tension. A Rockefeller Gift to Egypt GIFT of $10,000,000 for the erection and maintenance of a vast museum and for the establishment of an archaeo- logical institute in connection with it at Cairo was recently offered to King Fuad and the people of Egypt by John D. Rockefeller, Jr. This sum, believed to be the largest ever devoted to archaeological studies and research, was proffered as an expression of the friendship and respect America, the newest of lands, holds for Egypt, the oldest nation in history. Egypt’s wealth of ancient monuments and marvelous pieces of art has increased in late years beyond the capacity of the present museum of Cairo. A research in- stitute in connection with a new museum X-Ray Used in Treating Animals The Ellin Prince Speyer Hospital for Animals, New York, which treats thousands of ailing animals daily, is said to be one of the finest of its kind in the world. The picture, taker in the X-ray laboratory of the hospital, shows a surgeon X-raying a dog Cure Found for X-Ray Burns A cure for X-ray burns, that have claimed so many victims among doctors, has just been announced by Professor d’Arsonval, the noted French scientist, shown above. With high- frequency currents, d’Arsonval recently effected a complete cure for Dr. Debedat, a Bordeaux radiologist. D’Arsonval, whose special field is electricity, after years of research recently de- clared that death by electric shock is prevent- able, and efforts to induce respiration immedi- ately following a shock should be continued at least two hours. In the photograph, Professor d’Arsonval is standing at the high-frequency machine used to effect his remarkable cures will be of untold service to scholars from all parts of the world in following out their studies of early Egyptian history. It will also provide the best scientific training for students from Egypt itself. Building Material Made of Straw A NEW fireproof building material called solomite is a recent French invention. It is made of straw, and is cheap, light, durable, and soundproof. The straw is pressed into large panels nine feet long by six feet wide and two inches thick, bound together lengthwise by wires six inches apart. The heavy pressure to which it is submitted and the min- eral content of the straw combine to make it thoroughly fireproof. The material has been found to be excellent for side walls, ceilings, and partitions, and makes a fine surface for plaster and stucco. It has been used extensively recent- ly for summer cottages and for the soundproof booths in phonograph and radio stores. To FIND a serum for pneumonia, one of the nation’s most deadly dis- eases, Lucius N. Littauer of Gloversville, N. Y., a former congressman,who lost his wife from this deadly disease, has given $10.000 a year to New York University.

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A Useful Long Fork At last the elusive olive or pickle at the bottom of the tall bottle is beaten. The fork, below, will get it. It is just a long wire with a handle, and a crook at the end, but it will often prevent exasperation at your picnic It Mixes, Beats, Polishes and Grinds— All with One Motor A servant is scarcely needed in the kitchen equipped with so versatile a machine as that shown above. It does all sorts of kitchen tasks. It does mixing and beating, polishes silverware and cutlery, grinds meat and coffee, slices vegetables, crushes ice, turns the ice- cream freezer and sharpens knives. The remarkable thing about this kitchen unit is that only one small motor is used to do all of these kitchen jobs. The grind- er, beater, and so on, are separate attachments, which can be quickly clamped on or taken off the device For the Nightly ‘‘100 Strokes”’ The maker of this hair brush had a new idea. He put its handle on the side instead of on the end and made it half as long as the ordinary brush handle, so that it can be packed in less space. The brush may be cleaned in boiling water without harming or loosening the bristles Five Tools in One A most useful article around the kitchen and the house is the compact handy combination tool, illustrated at the right, that will sharpen knives with a few strokes, remove milk bottle caps, turn screws, remove fruit jar Eg¢ Cutter Prevents Waste Opening boiled eggs served in egg cupsis usually _ lids, and open bottle tops a mussy and wasteful performance. The little scissors pictured just above does a clean job, cutting the top of the shell quickly and evenly POPULAR SCIENCE MONTHLY May, 19% Novel Devices Lighten Cracks Open Clamshells Somewhat like a nutcracker but far more powerful is this tool (above), that will break open clams for you. The rough sides grip the clamshell firmly, and pressure does the rest If You Like Your Pepper Hot— If you like your pepper with its full flavor, you will get one of these little pepper grinders, made of glass and metal, to use at the dinner table. You can grind the exact quantity you need, and see it as you grind Unique Vegetable Mincer Sharp revolving knives in the single tool, shown above, mince cabbage and other vegetables in half the time it takes with an ordinary chopper. To work it, you simply push the device back and forth A Hook that Folds Up When not in use, the gar- ment hook at the left springs back into its recessed holder so that it is entirely out of the way. The weight of a cap or any garment hanging on it holds the hook down, but when it is taken off, the hook snaps back to its re- cess. It is easily screwed to a door or to a closet wall A New Way to Cook For the bachelor girl who has no grill, here is a capital idea. Turn your electric iron upside down, slip it into this metal device that clamps, as see in the picture above, on the edge of @ table, and there you have a cooking plate. The holder will support any size of iron you may happen to have. Careful cooking won’t spoil the iron May, 1926 This hand on tl in us MR | |

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wee S MB wPe Vv

May, 1926 Tasks of the Household ¢ Save Time and Energy for the Busy Woman POPULAR SCIENCE MONTHLY

—_—<—<—<—<—<——

below insures proper mixing

Toothbrush Carries Its Paste This toothbrush carries its paste in the handle. Pressure on the tube forces paste on the bristles. The brush can be replaced. A metal cover slips on the brush when not in use, and the handle folds over the tube An Apple Corer with a Spring The particular ad- corer at the left is that the core can be removed just as far as is wanted. The bottom can be left in the apple to retain the juices and sugar in baking. A spring cuts the apple clean.

vantage of the apple # Removes Corn from the Cob Corn slitter and creamer is the name of the little tool below, at the right, that helps in preparing sweet corn. Little teeth slit the kernels open while a flat edge scrapes out the con- tents as the device is pushed down the corncob

Library Table Hides Complete Electric Kitchenette For Quick Pastry Making A pie that is made in a hurry will be just as good as any other pie, if the crust is properly mixed. The device minutes. It is boat-shaped, and made of fine crossed wires which blend the flour and fat together in record time Apparently a Queen Anne table, when dinner time comes this attractive piece of furni- ture discloses itself to be a complete kitchenette and din- ing table combined. When you lift the top up you find not only an electric grill and toaster, but the electrical out- lets as well, right in the table. : One master cord connects the table with the usual wall outlet A Brush for Cleaning Combs

59

in a few

New Mop Is Self-Wringing A twist of the plunger in the handle of this mop wrings the mop dry. The mop fabric is removed very easily and, having a firm crosspiece at the bottom of the mop, it can be used to rub hard on spots on the floor

é

This Drainer Doesn’t Drip One disadvantage of the ordinary sink drainer is that it drips water as its contents are being carried to the garbage pail. This new drainer, above, has a tray that slips under it, giving it a watertight bottom while being carried

You can clean your comb in a jiffy with this new brush, made especially for that purpose. The brush rotates as it is pulled across the teeth of the comb

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60 Radio Builders Win Judges Announce Cash Awards an Our Unusual Construction Contest— How to Build a Set Like the First Prize W’inner’s This Receiver Wins First Prize—$150 Francis Carter Turner, of Middleburg, Va., who designed and built this remarkably fine set, is shown in the oval By occupation a farmer and stockman, he has Complete, detailed in- structions telling you how to build this prize winning set efficiently and economically are given on these pages above. made radio a hobby for years. parts of this country, Canada and the Philippines, the officials of the Popular Science Institute of Standards acting as judges have selected the prize winners in our Radio Construction Contest, which was announced last December. This contest, which was open to radio fans everywhere, called for in- genuity and careful workmanship. From a given number of instruments and parts, and from a specified wiring diagram, contestants were asked to build a complete radio receiver—the very best \ROM hundreds of entries from all possible. Entries were made in the form’ of photographs of the completed re- ceiver, from which the judges selected those which gave evidence of the best workmanship. ‘These, then, were put through actual working tests in the laboratory of the Popular Science Insti- tute of Standards. , Five receivers were chosen for the final elimination, and when they had been received at the Institute’s radio labora- tory, they were put through the same tests applied to all the commercial re- ceivers which are sent in for approval. The three prize winning sets are all excellent examples of radio design and construction, the judges declare. All three tune sharply and bring in stations in a way to satisfy the most exacting radio fan. Their makers have reason to be proud of them. The prize winners are as follows: First Prize, $150—Francis C. Turner, Middleburg, Va. Second Prize, $50 — B. O. Burgin, Albany, N.Y. Third Prize, $25— Raymond Hoffman, St. Mary’s, Pa. POPULAR SCIENCE MONTHLY Third Prize Winner—$25 Raymond Hoffman, of St. Mary’s, Pa., built this neat and efficient receiver. He used a glass panel mounted in a cabinet with sloping front Honorable Mention—Robert Black, East- hampton, Mass., and A. Thomas Nieman, Chicago, IIl. : Mr. Turner’s receiver is, in the opinion of the judges, one of the finest three-tube regenerative sets they ever have exam- ined. The design not only is unusually attractive, but is almost perfect from a theoretical point of view. The mechanical construction is equally excellent. The cabinet in which the prize winning set is housed is odd and original, for it is in the form of a sea chest. Since, how- ever, cabinet construction was not to be considered in awarding prizes, the judges noted only that the receiver was fitted properly into the space provided for it and that the complete set was pleasing in appearance. Because of the dimensions of the front panel, you will find, if you build this set, that it will not fit in any of the standard sizes of radio cabinets. It will be up to you, therefore, to decide whether to build a sloping front cabinet or a square cabinet for a vertical panel. The only May, 19% Prizes The Winner of the Second Prize—$50 The builder of this set is B. O. Burgin, of Albany, N. Y. (above), head of the science department of the Albany High School. sign embodies novel ideas in cushioned socket construction. Each tube socket is supported by live rubber so that jarring the table cannot cause ringing noises. tions to the socket terminals are made by flexible leads His workmanship is faultless, and the de- All the connec- change necessary in making the pane vertical will be to alter the angle of the brackets holding the sub-panel to the front panel. The winner of the first prize is an old-timer at the radio game. Although his regular business is farming and stock raising, he tells us that radio has been an absorbing hobby of his since away back in 1909—before _broad- casting was even thought of. “After making a selection of parts to build my contest entry,” he writes, “I provided myself with several sheets of paper, a ruler, square, pencil, and plenty of elbow room. Then there began what closely resembled a chess game. The radio parts took the place of men, and after I had moved them about until I secured an arrangement that looked promising, I marked their posi- tions on the paper and started in all over again witha fresh sheet. Eventually Ihit on the arrangement that was _ incorpo- rated in the radio receiver that I built for the contest.” O BUILD a radio receiver like Tur- ner’s, first decide on the parts you will use. Almost any standard parts will do, and you can be sure.of their efficiency if you purchase only parts approved by the Popular Science Institute of Standards. These are the parts you will need: A, B, and C—Any standard _three- circuit tuning unit. D—Variable condenser (straight line frequency or plain type with capacity to suit coil B of the tuning unit). E—Fixed grid condenser, .00025 mfd. F—Fixed condenser, .0005 mfd. G—Fixed or variable grid leak. H, J, and K—Rheostats. L, M, and N—Vacuum tube sockets. May, ! 0- transf a forme /.. s— 7 inches U- posts. B, an and b Foi wind ABC. catiol coils inche doub ten tl two ¢ Tickl of wi half i ona at th Fig. unit, able mum Ke you tione for a can with faste winn tube sudd cond or e' T disk wire into ther stat: SIX-( dry ohm reql hect

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926 nel the the igh nd has nce ad- rts ral cil, ere ess of out hat )si- ver hit p0- for ur- vill May, 1926 0—Medium ratio audio transformer. ; p—Low ratio atidio trans- former. Le xen a Q—Double circuit jack. R—Single circuit jack. s—Filament switch. T—Front panel, 9 by 14 inches. U—Sub-panel, 6 by 13 inches. V and W—Sub-panel brackets. Two dials, 9 binding posts, 8 vacuum tubes, A, B.and C batteries, cabinet, and bus wire as needed. For those who wish to POPULAR SCIENCE MONTHLY " 97> 8 7 ~~ 4 S~ 4% 3-*” * 6 — ~~ - - 61 pends the quality of the music and speech from your loudspeaker. The front panel 7 in the prize set is one fourth inch thick and the sub-panel U is of the same thickness. You will note that the brackets V and W that hold the sub- panel U to the front panel T are fitted with screws fastened into blind holes in the back of the panel T. With this construction, the thick front panel really is necessary. Unless you are handy at this sort of me- chanical work, use the con- wind their own tuning unit Fig. 1. Rear view of first prize winning set. Note how sockets and trans- ventional — three - sixteenth ABC, the following specifi- formers are mounted so that the grid connections are extremely short inch panel material and bore cations are correct. Wind coils A and B on tubing two and one half inches outside diameter with No. 22 double cotton cvered wire. Coil A has ten turns and coil B fifty turns, and these two coils are one eighth of an inch apart. Tickler coil C consists of thirty-four turns of wire wound on a coil form one and one half inches in diameter. It should rotate on a shaft just inside the end of coil B at the upper end as shown in Fig. 1. With such a tuning unit, you will need one vari- able condenser D with a maxi- mum capacity of .0005 mfd. For the grid condenser EF, you can use one of the conven- tional type with clips attached for a fixed grid leak G, or you can use a variable grid leak G with the grid condenser FE fastened to it, as in the prize winning set. If you find the tube goes into oscillation too suddenly, try a smaller fixed condenser at I’, of .00025 mfd. or even .0001 mfd. HE rheostats H, J, and K should be of the graphite disk or of the very compact wire wound type in order to fit into the space allotted to them. Use twenty-ohm rheo- stats for storage battery tubes, six-ohm rheostats for the one dry cell type tube, and thirty- ohm rheostats for the tubes that require three dry cells con- Fig. 2. The vacuum tube sockets Z, M, and N in the prize set are of the new UX type. They will take any of the storage battery or dry cell tubes fitted with this base. If you prefer a socket that will take all types of tubes, there are a number avail- able that will fit into this arrangement. Buy high-grade audio transformers for use at O and JP, for on them largely de- This pictorial wiring diagram shows the various instruments the holes for the supporting screws clear through; then use counter- sunk flat-head machine screws with the regular brass nuts at the back. Fig. 7 shows the dimensions for bending up the brass brackets V and W. They are made out of strip brass one eighth inch by one half. inch in cross-section, and you will need two pieces about twenty-one and one half inches long each. The most logical way to get started on the construction of the receiver is to cut the front panel 7 and the sub-panel U to the right size, then bend up the brackets and fit the panels together. Next construct the cabinet and fit the panel to it. OW you are ready to drill the panel 7 and the sub- panel U according to the lay- outs in Figs. 5 and 6. Note that only the center holes for the various instruments have been given, since the actual mounting holes vary with different makes of instruments. Next mount all of the instru- ments. Before you start wiring, study the various illustrations, particularly Figs. 2 and 8, the theoretical and picture wiring diagrams respectively. The first wiring job is to connect the lower end of coil A with binding post No. 1. Then run a wire from binding nected in series. in almost the exact positions they will occupy in the finished set post (Continued on page 139) Fig. 3. The set as seen from the top. Make sure before you start that the parts you expect to use will fit into this arrangement. Straight line and right angle wiring combine for best efficiency Fig. 4. The view from the bottom. Set the transformers and sockets so that all the grid connections will be made as short as possible. Two rheostats and the adjustable grid leak are sub-panel mounted

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62 POPULAR SCIENCE MONTHLY Radio — Here and There Some New Ideas and Devices WJZ’s Giant Apparatus Handling fifty kilowatts of power at WJZ’s high power station at Bound Brook, N. J., is quite a problem. Extraordinary means have to be taken to operate the controls because of the high voltages and the enormous amount of current carried in the various cir- cuits. Above is shown a pair of vernier condensers used for tuning the antenna circuit. A small electric motor drives through a gear cut from an insulating compound to change the adjustment. At the right is one of the huge, motor operated oil switches. Practically all of these powerful switches are con- trolled by relays from the control room i. cha y, 3) Oe 3 7. ” acm siemens SS oe ee eee ee mee The Tubes at Hillmorton Here are the tubes that furnish the power for the new English broadcasting station at Hill- morton, England. When the station is actually in operation, a gate and railing pre- vent anyone from approaching as closely to the powerful vacuum tubes as is the radio engineer above. Tubes are water-cooled after the manner employed in high-powered stations Wii wae \) Bb vex reece +1 ® }., RADIV-SiVte FS, Tee ru Forte Rb 5: Sete. "What 7 HILAL 9g, V¥sne mmm i eT ee A Cylinder Loudspeaker Dr. Lee De Forest has just invented a new type of radio loudspeaker that is shaped like a cylinder. The surface is made of thin material, and the sound is sent out in every direction with equal intensity. It is claimed that the construc- tion of the loudspeaker is such that it is almost entirely free from blasting and distortion on the extremely loud signals Novel Loudspeaker Test In order to test the quality of reproduc- tion of various types of loudspeakers, J. D. R. Freed of New York, above, arranged thirty-two of them in rows on shelves and connected them to a master control switch so that he could shift instantly from one to another. A tiny electric light bulb is mounted in front of each of the loudspeakers and con- nected in such a way that it lights up when the particular loudspeaker in front of which it stands is being used Drop a Nickel in the Slot and Tune-in! After sixteen months’ work, Joseph Pinto has completed the unique slot machine shown at the left. When you drop a nickel in, the machine is set in operation so that you can tune-in and listen to your favorite radio station for alimited time. It operates equally 4s well on either batteries or houst current, and a red warning light flashes up one minute before the time 18 up ful life sound your electr wire show! agains the d out t hold verti

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6 is is d eof. aw In drilling a panel, rest May, 1926 POPULAR SCIENCE MONTHLY Hints for Novices in Radio How to Test Your B Battery Other Helps to Better Radio Results least ninety percent of the trouble calls are caused by dead batteries. Frequently it is the B battery that has be- come exhausted. The first indication that a B battery is nearing the end of its use- ful life is a slight decrease in the volume of sound, accompanied by noises that often strongly resemble static. A voltmeter is the best instrument for use in testing B batteries, but if you have no voltmeter it is a simple matter to test your batteries with the aid of a ten watt electric light bulb. Connect a piece of wire to one terminal of the battery as shown in the illustration and hold it against the metal screw threads on the side of the base while you touch the metal button on the end of the base to the other Rive service men agree that at terminal of the battery. LD DRILL e . The bulb should VERTICALLY |g E light to about half of its normal bril- liancy. If it shows only a very dull red or entirely fails to light, you may be sure that a new battery is needed. RILLING the panel for a radio receiver is simple if you use care and do not try to rush the job. Be sure to rest the panel flat on a piece of hard wood so that the point of the drill will not break through and tear out the material around the hole. In drilling large holes, itis a good idea first to drill the hole with a small drill—say one sixteenth inch. Then when you use the larger drill it will follow the small hole and will not drift to one side or the other. Take special care to hold the drill in a Vertical position. it on a block of hard wood to prevent bad edges around opening | BOTTLE ||| INSULATOR - A bottle with a heavy [JF You are put- rim fitted over a pole ting up a tempo- makes fine insulation for experimental or rary antenna f y antenna for amateur-built antenna experimental — pur- poses, here is an ingenious way to insu- late the wire from the supporting pole. Any size or shape of bottle will do, pro- vided the mouth is sufficiently large to fit over the end of the pole and there is a fairly heavy rim which will prevent the Wire from slipping off the bottle. An antenna of this type is particularly good An easy way to test your B battery with a piece of wire and a_= small electric bulb in rainy weather, as the overhanging bottle prevents the leakage ordinarily produced by the continuous path of moisture between the antenna wire and the ground under pole. OST new radio fans are under the impression that a storage battery is simply a box in which electrical energy can be stored like water in a tank. And the consequence is that they treat the storage battery as they would a water tank. In other words, they use it till the tubes will not light any more, and then they recharge it or have it recharged at the nearest service station. This conception of the function of a storage battery is responsible for the short life of many batteries. The storage battery is not a place where electrical energy is stored. What actually happens when you pass direct current through a storage battery is that a chemical change takes place in the material in the plates. Then when you draw current out of the battery another chemical action goes on which results in the production of an AB C’s of Radio ANY beginners puzzle over the kind of wire to use in wiring up a set. For electrical efficiency, it makes no difference whether you use insulated or plain bare wire. Nor is it neces- sary to use heavy bus wire. Any wire down to size 24 will do as well from an electrical stand- point but, of course, the bus wire is better because it is not likely to sag out of place. Re- member these points, for a good job: 1. Make each wire as short and direct as possible. 2. Solder or tightly clamp every connection. 3. Space all wires as much as possible, considering the arrangement of the instru- ments. electrical current. But this chemical ac- tion only takes place properly when con- ditions are right, and that means that you must not mistreat the battery by letting it stand in a discharged condition. When a storage battery is allowed to stand in a discharged condition, another and very in- jurious chemical reaction sets in and grad- ually renders the plates incapable of per- forming their proper functions. There is only one way to treat a storage battery, and that is to test it regularly with a hydrometer: and whenever the little float inside the syringe sinks down in the solution that you draw up in the syringe by means of the bulb at the top until the figure 1200 or at worst 1150 shows even with the surface of the solu- tion in the syringe of the hydrometer, connect up the weak battery with the charger at once. ANY of the latest types of vacuum tube sockets have both filament terminals marked F instead of F—and F-+, be- cause it does not make any differ- ence which way the current flows through the _fila- ment. What you must watch out for, however, is that the other wires in the hook- up are connected Your should be tested regu- larly with a hydrometer and always kept clean and charged close to 1280 storage battery with the right filament terminal. In other words, it makes no difference which terminal you make positive or neg- ative, so long as the wires to be connected +OR= When filament ter- minals are’not marked + or —, be sure to connect wires correctly to the ter- minals you select as positive and negative to the minus fila- ment terminal ac- tually are con- nected to the fila- ment terminal you have decided shall be minus. Take the detec- tor tube socket in any radio set, for instance. if you in- tend to use an amplifier type of tube in this socket as is the regular practice today, you will find that there is a wire from the tuning condenser that is connected with one end of the tuning coil and which is also connected to the positive filament terminal of the socket. To simplify your wiring. you may find it worth-while to connect the positive battery wire to the terminal of the socket that is actually marked minus instead of plus, and vice versa.

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64 POPULAR SCIENCE MONTHLY May, 19%, May, I You Can Now “Turn on the Ice”} U _ Electricity or JH, eetnan. An threatens the iceman. And all because modern science has made marvelous strides in perfecting small ice making machines for the home or apartment house. With one of these outfits, your wife need not stay in half the day waiting for the iceman. There will be no more muddy footprints over the kitchen floor, nor ice boxes smashed by slipshod handling of ice. You can go away for a week, leave the house or apartment completely locked up, and yet find your butter, eggs, and cream in perfect condition when you re- turn. Several types of refrigerating plants for the average home now can be purchased at from $275 up, depending, of course, on the size of the ice box. Or, if you already own a really good ice box, a refrig- erating unit easily can be installed with a special tank taking the place of the usual chunk of ice. Oneof the importantadvantages of the home refrigerating plant lies in the uniformly cold tem- perature maintained in every part of the box regardless of out- side temperature. And the char- acter of the atmosphere inside is also better for the preservation of food- stuffs because of the difference in the amount of moisture in the air. As ice melts, the air inside an ice box is ex- tremely damp. With artificial refrigera- tion moisture is extracted from the air and collects in the form of frost on the surface of the cooling unit that is installed in the standard ice COOLING chamber. FINS LL home refrigerat- ing outfits operate on the same general prin- ciple. In fact, they are simply highly refined models in miniature of the huge machines used in the artificial ice manu- facturing plants. An electric motor drives a pump that compresses the gaseous freezing agent, either sulphur dioxide or methyl chlo- ride. These gases, com- pressed and cooled to ordinary room tempera- tures, become liquid, and when the pressure is gradually released in the cooling unit inside the ice box, they turn into gas again. In doing so, they absorb heat. In other words, they cool the tank in the ice chamber to below the freezing point of water. This cycle is repeated over and over until the automatic control stops the motor when the temperature in the ice gas or Gas Operates New A Novel Type At the right is one of the latest types of electric refrigerating plants. Its parts are hermetically sealed, and it is operated by electricity. Above is a diagram of its principal parts A Complete Ice Making Plant One of the new motor-operated refrigerators for small houses or apart- ments, that provide even, dry cold for food, and clean ice for beverages box has been reduced sufficiently. The same control mechanism starts the motor again as soon as the ice box temperature rises to a predetermined point. The apparatus is automatic and requires no attention except oiling the electric motor at infrequent intervals. And even this small amount of attention has been eliminated by a new invention of two Swedish engineers. “Turn on the ice!” may become a common house- hold expression if this new invention works as well as ex- Say THERMOSTATIC CONTRO WUtbi tt Utttitii+bhiyy Home Refrigerators periments seem to indicate it will, The housewife has only to tun an electric switch or light a gas | flame to put it into operation, | ‘There are no moving parts. The proper amount of hydrogen, am. monia and water are in the her. metically sealed steel piping of the apparatus, _ The heat from the electric heat. ing element or the gas flame in the Swedish apparatus continuously drives off ammonia gas from the water in which it is absorbed in one compartment. The gaseous am- monia is liquefied by the cooling effect of water from the regular house supply flowing © slowly through a cooling jacket. Then the ammonia turns into gas again in the cooling tank inside the ice box, where it mixes with the hydrogen gas and is drawn by gravity into another chamber where it is reabsorbed by the water. The water containing the ammonia is pumped by thermo- syphon action into the first tank, and the process repeats itself as long as the heat is turned on. The cost of operation for any of the modern refrigerating sys- tems depends, of course, on the ; size of your ice box, on the out- side temperature, and on the care taken to see that the doors do not remain open longer than necessary. In many parts of the country, electric power for a home refrigerating plant can be obtained for five cents or less a kilowatt hour, and when current is obtainable at these low rates, you can keep your ice box cold by means of a home refrigerating plant for less than you would have to pay for ice. UT the great advantage of the appa- ratus is in the lack of attention required and the uniformly even cold maintained, which results in less food spoiled, together with the satisfaction of knowing that you are no longer depend- ent on messy icemen or any outside and possibly uncertain supply of ice. But before you place an order for either a complete new refriger- ator with an ice mak- ing apparatus built into it or simply the ice making machine to be Z applied to your own re- Y | frigerator, be sure that bz} -" a y you investigate — the #| standing of the concern manufacturing the out- fit so that you cai bank on adequate serv- ice if anything goes wrong. EXPANSION VALVE Compression Freezet At the left is a diagram of ae L/| compressor | MOTOR the working parts of the CONDENSER electric refrigerator shown COIL at the top of the page “ wn eee mupeme a oe a ee

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95 S/S a ew oS ee E «6h! QS a May, 1926 | Useful Additions to Your Car ge Ne, Full-Length Bed for Auto Campers Although this bed is made entirely of metal, it is arranged so that it folds up out of the way when not in use. Sagless springs are built into it. A unique feature is the method of support. A strong metal column is bolted to the floor boards back of the front seat. This column takes most of the weight Auto Notebook Salesmen, doctors, and real estate dealers will find this handy device useful for making memoranda or keep- ing addresses where they can be referred to while the car is in motion. Two remova- ble spools with a strip of starched cloth are arranged within the compact case so that any portion of the cloth may be brought opposite the opening and locked in place Shoulder Rests Promote Comfort Because the average road is curved from side to side with the center higher than the sides, the passenger on the left side of the back seat is constantly slip- ping over toward the right side of the car. The strain produced by attempting to re- main at the left end of the seat spoils the pleasure of motoring. These new shoulder rests (left) eliminate this trouble by keep- ing the left-hand pas- senger always in a very comfortable position POPULAR SCIENCE MONTHLY Novel Visors Cut Down Headlight G This new anti-glare device consists of elliptical visors so arranged that the light rays which normally would be thrown into the eyes of the approaching driver are de- flected instead onto the road surface in front of the car. The frame is made of metal and is fitted by removing the front lens and attaching clips lare Lifts Both Wheels In order to eliminate the need for a separate jack and the difficulty of oper- * ating it against the back axle especially, an English firm has brought out a pair of jacks designed to be at- tached permanently to the car. The stem of the jack is threaded and the nut is geared to the handle so that a very low reduction allows the car to be lifted with little effort (above) New Rim Keeps Ford Fan Working This simple rim is bolted on over the pulley on the Ford crankshaft. The rim is said to keep the belt from slipping off. It is easily applied Bumper and Luggage Carrier When folded up, this device looks like the ordi- nary full-length rear bumper, but it can be un- folded to carry extra luggage that would other- wise clutter up the tonneau and be in the way Tow Line Has Spring Buffer The spring buffer at the right incorporated in the tow line above prevents snapping the cable when the tow car takes up the slack in the line. Another feature is the peculiar shape of hook at each end of the line that permits quick attachment with- out tying knots, a big item in its favor

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Gus Stresses Importance of Simplicity and Strength of Mechanism By Martin Bunn OW,” said Gus Wilson to his _ nephew, Henry, as they passed through the gate at the Milbury Auto Show, “the first thing for you and Grace to decide is how much you can afford to pay for a car. Then we'll see what looks like the best buy in that class.” Henry had just been handed another raise in salary and felt that at last he could afford to yield to his bride’s plead- ing that he buy a car. He had persuaded his uncle and Joe Clark, proprietors of the Model Garage, to help him make a selection. ** And don’t forget,” warned Gus, “that buying your car on time gives you no excuse for spending too much for it.” **A thousand is about the limit,” said Henry. “I’m sure I can swing that much.” ; “That means not over nine hundred for the list price,” broke in Joe Clark, “because freight, taxes, license and the rest of the incidentals will certainly run it up to the thousand mark.” “T’d like to get one of those sporty- looking roadster types,” said Henry a few moments later, as he gazed longingly at a flashy job finished in pale green with lots — of nickel fittings. “Why, Henry,” chimed in his wife, ‘you promised me a sedan. I don’t want a car that will hold only two people.” RACE is right, son,” Gus said. “If you can have only one car, the best buy is a closed model, but I'd recommend a coach. You get a lot more for your money than you do in a sedan. Roadsters are all right for rich people who can afford to keep more than one car. I'll admit that it’s a lot of fun to drive a fast roadster, but it’s a nuisance when you want to take along some of your friends. * And,” continued Gus, “if you'll take my advice, you'll lay off any car that is painted in very light colors. Dust and the tar they put on the roads will make one of POPULAR SCIENCE MONTHLY How to Pick the BEST those pale pink babies look like the dick- ens in short order. Stick to a dark blue or green unless you want to spend all your spare time washing it.” “T wouldn’t give a fig for all the closed cars in the world,” peevishly. “Then why not compromise on a tour- ing car?” suggested Gus with a wink at Joe. “Humph!” exclaimed Henry. “And have about a million curtains to put up growled Henry Know Your Car HOCK absorbers or rebound snubbers properly applied and kept in good working order improve the riding of any automo- bile. The ideal shock absorber should permit free compression of the springs on a bump and then the friction mechanism should take hold immediately to prevent the usual jolt. The maximum shock absorbing effect is obtained only if absorbers or snubbers are de- signed for the car to which they are fitted or built so they can bé adjusted to give proper friction. To get the best riding comfort in driving, follow these rules: 1. Get high-grade shock ab- sorbers and see that they are correctly adjusted. 2. Keep your springs well lu- bricated and protected from mud and ¢grit by some form of covering. 3. See that your tires are pumped up to exactly the right pressure. Too much air makes the car hard riding, too little shortens the life of the tires. May, 192% Car in Its Class Bee Al, right, Hen- ry,” agreed Gus, “let her have the disk wheels if she thinks they’re so classy. You can take the extra amount out of her allowance.” “That’s not fair,” said Grace, pouting. **Get your old wood wheels if you think they’re just as good.” every time it rains! Nothing doing! If we don’t get a roadster, we might as well go the limit and get a coach.” “T’m so glad that’s settled at any rate,” observed Grace. “Can’t we get one of those eight-cylinder things? You know Agnes’ husband bought her one, and it’s just too smooth for anything!” “There's the woman of it!” grunted Gus. “Always trying to keep up with the Jones’s. You couldn’t possibly get an eight-cylinder car for the price Henry mentioned. You can get a good six, though.” EEMS to me a four-cylinder car would be a lot easier to repair *han a six,” said Henry as they passed a shiny new four-cylinder model. “You're dead right, son,” stated Gus emphatically. . “Just fifty percent. less work when it comes to grinding valves or putting in new rings or tightening up con- necting rod bearings. And it’s a whole lot easier to locate trouble in a four-cylinder engine, too. There was a time when the four-cylinder cars were a whole lot rough- er running than the sixes, but what with light pistons and good stiff crankshafts, the four-cylinder cars of today are pretty durn smooth. If you look at it from the standpoint of expense for repairs and the amount of work you will have to do your- self, the four-cylinder car is certainly the best bet. “Outside of work on the motor itself, a light six won’t require any more attention than a four. Changing tires or overhaul- ing the rear end or anything like that is the same on both. Are you going to drive the car too, Grace?” } “You bet I’m going to drive!” said Grace emphatically. “Then don't forget, Henry, that a six- cylinder car needs less gear shifting than a four. Grace would get along better with a six on that account. Whatever car (Continued on page 142) you buy, though, Ma}

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May, 1926 POPULAR SCIENCE MONTHLY Sal right off in a specialized line of work that will give you steady profit, without dull seasons, without “‘lay-offs,’’ and put you beyond any boss’s whim. Go into EXPERT FLOOR FINISHING. Master overnight this well-paid trade, eagerly in de- mand everywhere today ... because the service it offers is advertised monthly to millions! And com- petition won’t worry you! Many Earn $15 to $20 a Day Men no abler than you get from $2.50 an hour up for WAX- POLISHING floors by the Johnson Electric method, for which we fully equip you. And this big-paying work is WAITING for you right where you live, NOW. Every home, club, hotel, restau- rant, almost every store, should have its floors and linoleum pol- ished regularly. You can do it perfectly, be paid spot-cash for it, and never have to go home tired—for the machine does ALL the hard work. JOHNSON'S WAX Electric floor Polisher This wonderful, new, swift, easily-managed machine BUR- NISHES ANY FLOOR to a beautiful, gleaming lustre. It runs itself. You merely guide it along. You need not bend nor stoop nor strain to doa perfect job. Ten times quicker than hand- methods it DEEP-WAXES wood, linoleum, tile, marble and all other floor-surfaces to the finest polish imaginable. Investment Less Than $50 You get into this well-paid vocation for an outlay under $50. This fits you out with the wonderful Johnson Electric Floor Pol- isher, a Lamb’s-wool Mop for applying the wax and a generous supply of JOHNSON’S LIQUID WAX. You pay not one cent for the training which qualifies you as a Floor Expert. We con- tribute that FREE OF ALL CHARGE to you. And you are actually SET UP IN BUSINESS IMMEDIATELY, right in your own town. Don’t Delay Act NOW Just as a starter, send the coupon and get the details. It doesn’t obligate you in the least and it may be the starting point of a big, successful, prosperous business of your own. Look into this! tired of working for someone else = = here is your Opportunity iA ye li you’re "Be your OWN Boss" Ite UIA Clip This Coupon Out and USE it S.C. JOHNSON & SON, Dept. P.S.5, RACINE, WIS. “The Floor Finishing Authorities” Johnson Electric Floor Waxing Service. a Please tell me how I can realize $110.00 a week giving expert Samu cco w ceca c ame e mee allllMNNNNNNNNNUNUNNUNNUNININININNINN NUNN ININUNiNNNMNN ‘(S) This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6.

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POPULAR SCIENCE MONTHLY May, 1926 Newest Aids for the Autoist An Arm Rest for Closed Cars, and Other Useful Ideas HILE the driver of a touring car or runabout usually finds that the side of the body is low enough so that he can rest ‘his left arm comfort- ably along the edge of the body beside the seat, the owner of a closed car is not so fortunate, especially when the window is partly closed in cold weather. A simple arm rest can be constructed out of sheet metal and screwed to the side of the body at a convenient height. Figs. 1 and 2 show a typical example. The galvanized or sheet iron framework is covered with upholstery fabric to match the interior trim of the car. On long drives, an arm rest of this type will add greatly to the comfort of the driver. Fairly heavy pad- ding is desirable to promote comfort. N SOME makes of cars, the choker rod is fitted with a spring to pull it back into position when the knob is released. This construction is used to make it im- possible for the motorist to forget to throw off the choker after the motor is warmed up, but it is a nuisance in very cold weather when it is necessary to hold the choker out for some time because the motor heats up so slowly. A piece of sheet iron bent up and slotted as shown in Fig. 3 will eliminate this trouble. The motorist will have to bend and shape the device to suit the construction of his own choker rod, and it will be a good idea to fix it so that it will hold the choker in approximately the position required for warming up rather than for starting. In order to make sure that the device will always be handy when needed, get in the habit of tucking it down at the end of the seat cushion when not in use. ITH many of the oil-regulat- ing types of piston rings, it is necessary to drill holes in the piston ring slots to allow the excess oil that is scraped off the cylinder walls to flow back into the crankcase by way of holes through the pistons. Great care must be taken in drilling these holes to make sure that they are does not cut into the side of the slot and cause the gas to leak past the piston rings. A simple way to avoid these difficulties is to make a drill jig out of a piece of one of the old piston rings. Fig. 4 shows how this can be done. Drill TIRE. VALVE. NOZZLE ~~~ _ the hole in the : piece of old piston ring a trifle larger than ordinarily. . IMPLE way to make a satisfactory bumper for your ry car is shown in Fig. 7. A tire pump will Fig. 5. It consists prove useful in cleaning e tw brackets out bolt holes that have 0 wo rackets become filled withcarbon made,of heav y HOSE FROM' TIRE PUMP closed car. Fig. Figs. land 2. Acon- venient arm rest for a shows its simple con- struction at a glance Fig. 3. A piece of a a oe DRILLING viIG- S AND SPACER OIL CONTROL RING sheet iron bent and slotted makes handy choker rod_ holder Fig. 4. To prevent cut- ting into piston ring slots, use a drill jig made from an old ring U- BOLTS spaced properly and that the drill Yo’ 4 STEEL BRACKETS Fig. 5. A homemade bump- er can be constructed from a three-inch iron pipe and pieces of heavy strap iron ——— —— XN PIPE FROM BREATHER Ten Dollars for an Idea! HARLES S. JONES, of Philadel- phia, Pa., wins the $10 prize this month for his homemade bumper, which is shown in Fig. 5. Each month POPULAR SCIENCE MONTHLY awards $10 in addition to regular space rates for the best idea for motorists. Other published contribu- tions will be paid for at usual rates. strap iron, some U-bolts, and a section of three-inch iron pipe with caps screwed on the ends. A coat of enamel can be ap- plied to match the car or the bumper bar can be nickel plated. NE source of discomfort in the closed motor car that is annoying and un- healthful is the burnt gas that gets into the body from the breather pipe by way of the pedal slots and the other openings in the floor boards and dash. Even in a motor that is in perfect working order, more or less of the exploding gas leaks past the piston rings into the crankcase. The breather pipe in the crankcase allows this escaped gas to flow out of the crank- case, otherwise the accumulated pressure would cause loss of power and consider- able oil leakage. One simple way to get rid of these noxious gases is to fit a tight cap over the top of the breather pipe and also fit a branch pipe that is run back far enough under the body so that the gases will be discharged to the rear of the car, as shown in Fig. 6. The size of pipe is not important, although it is not a good idea to use smaller than 14-inch inside diameter. Copper tubing will do very nicely. pear ser at rr a large number of cylinder head bolts are stripped each year simply because the hole in the cylin- der block into which the bolts were screwed filled up with carbon when the tops of the pistons were scraped and the extra force applied in an attempt to force the bolts up tight proved too much for the threads. It isa mighty good idea to insert the bolts loosely in the holes nearest the piston being scraped, but if carbon does get into them, it can be removed very easily by screwing a tire pump hose to a spare valve stem and blowing the carbon out of the holes. The end of the valve stem that goes inside the tube is made regularly with a small hole that will do nicely as a nozzle. The flange can be sawed off, if‘de- sired, as shown in Fig. 7. Use a pointed instrument to loosen up the carbon if it caked hard. Fig. 6. A branch from the breather pipe run back under the car will divert the noxious breather fumes to rear of car INING up the hole in the spring bushing with holes in the shackle is no simple job. Fre- quently the threads of the stacmie gout, shackle bolt are fl: (Sr battered in forcing 9. \YAc> it into place. A simple remedy is a pointed cap nut in place of the reg- ular shackle bolt nut, which can be driven into place with a hammer. (Fig.8). An ordi- Tis 8,4 vlate ap nary nut can be : spring bushing and shackle filed this shape. holes together for the bolt

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POPULAR SCIENCE MONTHLY Feige as Se SEES SEB. isiipe., eeeeeee> Le? os SS, as Soo SA = Latite Shingles’ The greatest problem in the manufacture of asphalt products solved by Tycos Instruments fj Says M. S. Darrow, Manager Barber Asphalt Co., Madison Plant, Madison, IIL. “Keeping our materials at the proper temperature—the greatest prob- .em in the manufacture of asphalt products—has been easy since we installed Seoe Index and Recording Thermometers throughout our plant in 1916. We are the largest manufacturers in the world of asphalt products, especially roofing. } 2 A isa | | Tycos " Home Tycos Office Thermometers An aid in promoting human efficiency. Tycos Bath Thermometers . ; i 4 To enable you co get the most good from. “In making roofing we combine several different asphalt materials at the high | your bath. melting point of 350°F. Air passed through causes oxidation; and the higher the iq Fycos Wall Thermometer temperature and the faster the air goes through, the quicker the oxidation. However, To help you to maintain a temperature in your : : ‘ : sae : ele house conducive to good health. the air sets up a chemical reaction which produces additional heat, and if this is SiestaliCemenee not controlled we have an explosion. In regulating the fires under our 19 conver- 2 ty poe ‘ : | an 16 Lenten to is To show you the right way in unfamiliar country. efs, we rely upon ayior ermometefs. Tyeos Hygrometer To enable you to keep the humidity of the at- mosphere in your home correct at all times. Fos Home Set Bake Oven Thermometer, Candy Thermometer, Sugar Meter. The secret of accurate results in | cooking. tyeos Fever Thermometers A necessity in every home. Beos Stormoguide Forecasts the weather twenty-four hours ahead with dependable accuracy. “The four saturating tanks, in which roofing felt is impregnated with asphalt from the converters, must be kept at a temperature of 360-400°F. A Zecos record- ing thermometer on each gives us an accurate check and record. The saturating tanks are heated to the proper temperature by circulating heated oil around them. On each of three absorbers we have double registering Jeos recording both out- going and incoming temperatures. “Four flue gas thermometers show whether we are operating at an efficient tem- perature. The proper temperature for our boiler feed water is indicated by a Taylor. Some 30 other Taylors are used as testing thermometers, in laboratories, etc. Your dealer will show them to you. Ask us, “We have used other makes of thermometers, but none are as satisfactory as Cones tn tasiie f the ab on stat, for $ on any of the above On our converters we can go to within 5° of the flash point and feel safe with Zycos. TO MANUFACTURERS If your manufacturing processes require the indicating, recording or control- _ling of Temperature, there is a type and style of instruments in the Zeos Line of 8000 varieties that will help you. Informative literature on any type of instru- ihoet x ment will be sent you promptly on request, or our engineer will consult with you oo ee Y on the application of Jos to your particular manufacturing problem. ; % ae * lycos' faylor /nstrument Companies for the Medical Profession Main Office and Factory Sphygmomanomeeer, Pocket & Office types i ROCHESTER,N.Y. - - U.S.A. Fever Thermometers, Urinalysis Glassware Canadian Plant: feos BUILDING, TORONTO a tenet SHORT & MASON, Ltd., Manufacturing Distributors in Great Britain ) sons THE SIXTH SENSE OF INDUSTRY Tycos Temperature Instruments INDICATING + "RECORDING + CONTROLLING © This seal on a radic or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. ‘See page 6.

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POPULAR SCIENCE MONTHLY

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& AZ May, 1926 POPULAR SCIENCE MONTHLY 0 ome Works Arthur Wakeling, Editor 7 You Can Make This Spanish Galleon A Superbly Decorative Ship Model Simplified for Beginners— The Design Is Genuinely Authentic and Can Be Copied at Small Cost By Carrain E. Armitace McCann ITH stately tread El Senor Ca- \ \ ballero Juan Flores de Sidonia walks the high poop of his great- ship or galleon, the Nuestra Senora Afortunado, one of the finest of His Most Catholic Majesty’s Armada from Spain and other Mediterranean ports. His ship, though neither speedy nor weatherly, is heavily armed and gaily decorated as becomes so noble a vessel. She is bent upon the vengeful task of sub- jugating Britain’s might. She did not accomplish this, being badly stung by Drake in his wasp of a ship, - but, luckily for us, she escaped destruction and later carried un- told treasure from the Spanish Main. Thus, with a little skill and a lot of patience, we are able to reproduce in mini- ature this magnificent galleon. The model depicted is not really intended to be any particular galleon, but it is a good sketch . model of this type of ship as it actually existed. Every depart- ment store is flooded with so-called galleon models; they are not models at all, but merely decorations with a ship-model mo- The essential tools are merely the usual home workshop or carpenters’ tools, with, in addition, some pin twist drills; a very small hammer; and, of course, a sharp pocket-knife. A few special tools will be needed for the rigging later, but nothing unusual or expensive. First of all, a full-sized working draw- ing of every part should be made. You (that is, three or five thin sheets of wood glued together to form a board) is spec- ified, solid wood, or, in some places, even wallboard or cardboard may be used; and wherever cardboard is mentioned wood may be substituted. Always look in your own lumber pile and junk box first, as the chances are that you will be able to find almost everything you need to make this model, provided you use a little ingenuity in utilizing the available materials. The center piece A, Figs. 2, 3, and 5, is cut from a piece of 14-in. three-ply (or solid) wood 8 by 25 in. Use the full-size view at the bottom of Blue- print No. 46 as a tem- plet, or transfer the out- line to the board by first drawing 1-in. squares to serve as guide lines. The shape of this piece represents the outside profile of the hull, as seen in Fig. 5, except along the top, where the line has been made heavier to enable you to follow the shape more easily. HE division be- tween the rudder and the stern is merely a V-cut on either side. Round the edges of the centerboard a tri- fle and cut out the scrolls in the bow. Then o tif, and bear but little resemblance to any ship that ever floated. ERE, however, is a model designed from contemporary plans, engravings by Vroom, with other reliable data. It is somewhat simplified and every detail is not embodied, but in general line and in such detail as appears, it is, I believe, a good replica, well pro- portioned and sufficiently ornate. Those who wish can simplify still further, or, on the other hand, substitute real carving for pasteboard and beads,,. The size over all is 30 by 30 in., the scale being approximately 1 in. to 1 ft. Fig. 1. Captain McCann, one of the world’s leading authorities on ship models, at work on the Poputar SciENCE Montnuty galleon. If you asked him what he was doing, he would tell you in three words, in the language of a navigator — “‘frapping the gammoning” can save most of the work of making your own drawings by sending 50 cents to the Blueprint Service Department of PopuLar SCIENCE Monta ty, 250 Fourth avenue, New York, for Blueprints Nos. 46 and 47. Use the coupon on page 89. Where any particular material is men- tioned, that is the kind the writer has found the best adapted to the purpose when primary consideration is given to ease in working. Other materials may be substituted; for example, where plywood mark the construction lines II to VII on both sides. For the body of the hull B, Fig. 2, white pine is best. It can be obtained 13¢ in. thick (planed). Glue together, in pairs, four pieces 34% in. wide and 18 in. long. Mark the construction lines all around each piece (Figs. 2 and 5). On the deck (upper side) mark the deck outline from part A and cut away to this. Then cut the profiles at the bow and stern (Fig. 5). Make cardboard templets to corre- spond to the six section lines given in Fig. 2, or trace them directly from Blueprint No. 46. Cut (Continued on page 88)

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72 POPULAR SCIENCE MONTHLY May, 192% You Can Be Your Own Decorator How to Apply the Popular Mottled or *‘ Tiffany’’ Finish on Painted Walls—The Secret of Blending the Colors By BERTON E Lior, Painting and Decorating Expert “PT LOOKS slike © tapestry.”— “Wonderful!”—“‘I never had any idea painted walls could look like that.” These were some of the remarks made by our neighbors when we re- decorated our downstairs rooms, a few years ago, in the now very popular “Tiffany” finish—a paint stippling treatment. Friends and neighbors had watched this little decorative operation with much interest, mingled with wonder- ment, knowing that I was a “paint man” and decorative counsellor. I had promised to show them something fine in painted wall decoration, but they did not visualize what it would be like, as paint stippled walls were not then so usual. A brief account of just how the work was done—it was the handiwork of Friend Wife and myself—will be helpful to others who wish to try this simple yet exceptionally ef- fective method of decoration. The rooms, a large living room and an average sized dining room, had previously been papered. Wifey and I put in a couple of evenings taking off the old paper. At- tired in a raincoat and work- ing ahead of me around the room, she saturated the paper with warm water, applied with a large whitewash brush. I came along behind with a large putty knife, ploughing the loosened paper off in furrows with a quick-starting, upward motion. The secret of removing wallpaper, by the way, is to have it well saturated. Much of it, when thoroughly soaked, may be pulled off by the yard. If the plaster, by any chance, is damaged in the process, it can be fixed with patching plaster. tie-up between two adjoining rooms, yet each room would have distinct individuality of its own. The ceilings in both rooms were Caen stone wall paint in plain color—this delightful pinkish shade toning in with the side walls. In doing the foundation coating, two coats of Caen stone were applied with a 4-in. wall brush, the first coat being mixed with an equal part of varnish size (mixing size) to seal the porous plaster, which otherwise would absorb the paint like a blotter and make a sat- isfactory finish impossible, no matter how many coats were applied. Two coats are sufficient for a “Tif- fany”’ foundation coating, although in applying wall paint in plain colors, especially delicate shades as for the ceiling, three coats ordinarily are re- quired for a first-class job. N APPLYING wall paint it is better to use ¢riss-cross or zigzag strokes, Hit-and-Miss Painting The glazing colors are applied in irregular spots of varying sizes and later stippled with a cloth. At the left, Mr. Elliot is seen mixing the colors The paper off, we were ready to apply the decora- tion. We had de- cided on a “ Tif- fany”’ effect for both rooms, We had no precedents to guide us in selecting colors, but now paint manufac- turers furnish sheets prepared from the actual materials to show various “Tif- fany”’ effects, with specifications for pro- ducing them. This type of decoration is produced by applying a foundation of flat wall paint, over which is stippled or mottled a coat of “glaze colors.”’ These are transparent oil colors of great clearness and brilliance, which permit the underbody color of the flat foundation coats to show through to a considerable extent, producing a rich, luminous depth of color. The stippling is usually done with a cloth or crumpled newspaper. The effects we decided on were: For the living room: Foundation coat, Caen stone (flat wall paint). Mottling (glaze) colors, ivory drop black and burnt sienna. For the dining room: Foundation coat, Caen stone (flat wall paint). Mottling (glaze) colors, cobalt blue and Japanese brown. Typical stippling shown half size—raw umber glazing color over a straw-colored foundation These two effects would insure similar- ity in tone to provide the desirable color which tend to keep the brush marks from showing. The paint should al- ways be stirred thoroughly before using, and if it should spread a little hard and drag under the brush, a small amount of turpentine will make it work easily. Twenty-four hours should be allowed for drying between coats. If there are any broken places or cracks in. the plaster, they should be filled with patch- ing plaster (see page 98) before the paint- ing is started. As soon as the foundation coating was thoroughly dry, we were ready for the stipple coat. A little ivory drop black was squeezed from a small tube of “glaze color” into a receptacle of “glazing liquid,” a prepa- ration sold for the purpose by nearly all first-class paint stores. Proportions were experimented with until the desired shade was obtained. (Continued on page 97) Mr. Elliot shows how the glazing colors are stippled or mottled with a clean, crumpled cloth May, 1926 a | A Ro th ‘OR ¢ | J does! drawn smoothit seed bec garden 1 practical may be casing, The hart rotates it is pul bolt, s¢ | pieces « | The: | the stre | that m | will mé | Hole | blocks | throug | angle, | heads | the int | heads as rei | Befc | casing, with f part o | REINFC | BOLT La cas sand | Alloy oe: boar thim 8 pi arm, with * es

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May, 1926

ie Home Workshop! | A Rotating. Harrow Lightens the Work of Gardening '- garden patches where the space does not permit the operation of horse- drawn implements, the leveling and

smoothing of the ground in preparing a | seed bed usually has to be done with a garden rake—a slow and tedious job. A practical tool for performing this work may be made from an old auto or truck casing, four pounds of 30-penny spikes, a The harrow rotates as it is pulled |bolt, some cement and sand, and two | pieces of timber. The size of the casing to use depends on the strength of the operator or the power that may be available. One 30 by 31% in. will make a one-man tool. Hold the casing open with sticks or blocks and drive the 30-penny spikes through as shown at about a 45-deg. jangle, staggered 4 in. apart. Allow the | heads of the spikes to remain ¥ in. above the inner surface of the casing. Bind the heads with a few pieces of wire to serve as reinforcement for the cement. Before pouring the cement into the casing, fasten a 1 by 6 in. board across with four bolts, as indicated. Mix one part of cement and three parts coarse | REINFORCING WIRES

| N 4 | 30d. SPIKES AT . | 45° ANGLE THIMBLE © Large spikes are driven through an old auto casing, which is then filled with concrete sand or gravel and pour into the casing. ‘Allow the cement to set for several days. A l-in. hole then is bored through the board at the center of the casing; a thimble cut from a 34-in. pipe, 1 in. long, 8 provided; and the tongue or pulling am, 2 by 2 in. by 8 ft., is pivoted in place with a 3¢-in, (Continued on page 85) src

POPULAR SCIENCE MONTHLY 73 WELDERS

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® This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6.

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74 POPULAR SCIENCE MONTHLY May, 19% | Wanted a Hand Planing Machine So [ Made One—It Has Easy Running HIS jointer, or hand planer, as it is often called, was first designed for use in a home workshop. It was so efficient that a second one was constructed on the same plan for use in a school shop. While it. is not designed to carry a heavy, continuous load, each of these machines is reasonably accurate and on occasion will surface the face of a 10-in. board. The same general plan might be followed for a machine for lighter service. To run out a machine for heavy service, the head would have to be made more substantial and the size of the motor increased. In most cities, a half-horsepower elec- tric motor is about as large as is permis- sible on the regular lighting circuit. That is the size used in this instance. The speed of the head is held to about 3500 revolutions a minute. A 2-in. belt is used to drive the jointer. The motor is mounted directly on the machine and the ad- justment on the glued belt is made by sliding the motor down in slots provided for that purpose in the board used for mounting the motor. Equal-leg angle irons, 14 by 3 in., are used for the legs and for the top of the frame sup- porting the head and the tables. The braces E are made from % by 2-in. angle iron. The frames made up from the parts J, M and E are first put together. If the shop is equipped to do welding, the corners are welded. The legs K next are worked to size and riveted to the two frames. Welding could be re- sorted to instead of riveting for this work, but the danger of the parts being warped out of square is considerable. Plates made from short lengths of the 3-in. angle iron are riveted into the lower corners of the legs to make feet, and they serve as anchors for fastening the machine to =a = = EVAN ENTOTEVY ON ATT NYRTITY | Materials for this jointer can be ob- tained easily. The ball bearings are from a junked auto. Note the cutter head and the ad- justing ways for the forward table in the view below the floor. One-half inch holes are drilled for the lag screws or bolts before fastening these feet in place. Particular care should be used to see that the top of the frame is fairly level, otherwise trouble will be experienced. in fitting the tables and head to it. With the frame in good condition, the work on the tables and the head may proceed. It wilt be noted that a good part of the head frame and table sup- Ball Bearings, and It Cost Me Very Little to Build By Ray F. Kuns, Principal Automotive Trades School, Cincinnati, 0, ports is made from 1 by 3-in. cold rolled steel. The rear table rests L are two 15-in. lengths of this material. Cap screws fasten them to the frame. Inasmuch as the rear table does not require a great deal of adjusting, the plan of allowing the table to rest on four cap screws was adopted. These screws may be turned to any necessary height; then the table is laid in place and clamped securely by means of the other cap screws arranged to come just 1 in. inside each of the first four on which the table is resting. All cap screws used to fasten the tables are ¥-in., and have the tops of the heads dressed off until they are nested in countersunk holes. The rear table could be adjusted more conveniently if it were provided with sliding ways as is the front. That is optional with the builder. The front table must be provided with easy means of adjusting the depth of the cut. To avoid complications, blocks of cold rolled bar are cut as indicated at F. The cut is at 45 degrees. In order to prevent the ways that are screwed to the forward table from slipping off their companion ways bolted to the frame, a cap screw and washer arrangement is used. Each of the four lower ways is drilled and tapped as near to the 45 degree edge as possible (Continued on page 93) Aap em = ; : r rk _ vse ~ rel q @: D oD il 4 ‘ a al © UT: + QOQ_ roe ) - | =, ' a i ut A a... 3 se il ir litte @ e 5 10" —e Sis REAR TABLE REST le si K - +t. —_sag : PT eae pe aip"ab sar’ ° ° ° ° ° oO oO ° \ ==+3) = - od lke Top, front and end views of the jointer and details of the rear table rest and the cutter head. The cut- ters are made from strips of tool steel. The same general design can be followed for a lighter machine May, 1926 You keyboz the exy withou cost yt Our and sz The and N to spe just c every spark

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May, 1926 Own a Typewriter ! A Bargain You Can’t \ GET YOUR typewriter now. A tf} genuine Shipman-Ward rebuilt ! Underwood is the one you want i —“‘the machine you will even- tually buy!” Everyoneneeds it; now anyone can afford it. Don’t send a cent—but do get our big special offer —our valuable book on typewriters and typewriting —free. You can learn to write on thig standard- keyboard machine in one day. A week after the expressman has brought it, you’d feel lost without it. A trial will prove it—and doesn’t cost you a penny! A New Plan Our rebuilt plan gives you the best machine and saves you a lot of money. The Underwood is so famous a make, and No. 5so popular a model, you'll have tospeak up if you want one of the lot we are just completing now! We rebuild from top to bottom; replace

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St.or R.F.D | LC), ened ean Renee Mapa gS. "Eee sneer Lo EE ATER ET ee IRE Sania © This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6.

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76 Detter POPULAR SCIENCE MONTHLY How Expert boca im Jime and Labor Old Bill Repairs a Machine Bed How to Draw Broken Parts Together with Red-Hot Keys shop watching the traffic go by, thought the day, with the first real marks of spring in the air, was glori- ous. It was wonderful to have a moment of leisure to look at the people driving by, and to see the first sprouts of green on a tree down the street. : Even so energetic a man as Old Bill seems to feel a certain lassitude in the spring sun- shine, and he reveled in the thought that he had nothing in particular to do on such a delightful morning. “You are wanted on the phone,” came a call from inside—a pin to burst his bub- ble of revery. He went into the office. “This is he,” he said into the transmitter. “Yes, I can come right away.” The smile that passed with the summons was back, or, rather, another smile took its place. Before, he had been glad just to be living; now he was happy because he was again in his element. He straightened the shoulders that had carried so many burdens— straightened them to receive another; and, once more the efficient man of machinery, he walked briskly through the shop before getting his flivver for a short trip to a furniture factory on the edge of the town. Modern industry demands machinery that will perform superhuman tasks. To this end designers and inventors have gathered machine elements together into a compact and complicated mass that they call an automatic machine. Almost human, an automatic machine! With many tools hogging, snarling, ripping and boring their way into the work at the same time! Moving parts that start, carry and stop with the delicacy and precision of human fingers! Gigantic frames that stand firm as granite! ()*: BILL, standing in front of the T WAS such a machine Old Bill had been called to doctor. A 20-ft. length of line shaft had been dropped on it and had cracked the bed. To Old Bill’s eye, the gathering around the machine had the semblance of a family gazing at the ruin of a home destroyed by fire. The whole factory force, with the possible exception of the fireman, was standing around the crippled machine. The accident had stopped production By James E tis Machine Shop Superintendent Old Bill supervised the placing of the heated steel keys, which pulled the two parts of the cracked table firmly together as the keys cooled and shrunk entirely for, as is often the case, the one machine played a part in everything that went through the plant. These things did not tarry long in Old Bill’s mind. He was studying the damage. A big overhanging section of the frame had been broken off. The casting was about an inch thick and formed a sort of extension of the main bed of the machine; and carried two spindles. The operators had‘taken off everything removable. BREAK IN eta a \ ™) CASTING SX i FINISH LINE An electric drill and chipping chisels were used in preparing the T-slots for the keys “Could you weld it?” the company asked. Old Bill slowly shook his head. ke appeared not to hear several other ques. tions. He was ransacking his mind for ideas. First he looked at the top of the break, and at the bottom; then stood off and looked at the sides. Finally he said: “Get it cleaned up, and | will be back in a little while.” “What are you going to do, =~ and how long will it take?” “Fix it—and by tomorrow morning,” Old Bill replied, and grinned. the president of HE head of the firm started to speak, thought better of it, and shook his head doubtfully as Old Bil hurried out of the plant. The ruts in the road seemed but creases in velvet to Old Bill as he drove the flivver to the shop. Only long training in driving enabled him to dodge the cars that darted in front. His mind was on something else. In the shop he sought Bob Laten first and told him to gather up some tools. Then he went to the blacksmith shop and drew a little sketch. “Leave some stock so that we cai machine these keys to fit,” he said, and hurried off to find Laten with the tools in a bag and an electric drill beside it. At the plant, Old Bill and Bob Laten began to lay off some holes. The appret- tice whom they had brought along con- nected the drill. In a few minutes chips were flying. Old Bill’s method of repairing the break was apparent to the factory superinter- dent, who stood beside the president. “He is going to cut tee slots in the edges of the broken casting,” he said, “and then shrink keys in to hold the parts together. The same w ay that the flywheel on our engine is made.” “Will it be strong?” asked. “Just about as strong as anything else could be,” Old Bill said, as he stood back and watched the work. “It is the best thing to do in (Continued on page 108) the president MANY time-saving shop ideas are contained in the continuation the Better Shop Methods Department, which you will find on pages 102 to 112 May, 1926 a]

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ant of . He ques. d for of the ttomn; ed at said: nd | hile,” to do, ike?” orrow plied, firm ought k his 1 Bill emed » Old livver long abled that mind t Bob im to nt to little > cal , and ols in Laten pren- con. chips preak nten- dent. 1 the said, parts wheel ident z else back best 2 108) ; are yn of nent, y 112. vay, 1926 POPULAR SCIENCE MONTHLY 77 ze Use this and F save your skin p _ “See that universal joint in the head of the " scraper? It certainly beats tying rags on a flock of sore knuckles.” A turn of the handle locks the blade of a Starrett Scraper at any desired angle. It’s about the handiest tool for tight corners you ever picked up. Has eight sharp edges— any of ’em can be put into action in an in- stant —a comfortable hand rest and a hard- wood ball and handle. If you’ve been using an ordinary scraper ask your dealer to show Floor, Bench and Cabinet Scraper No. 181 you a Starrett — and you'll see the difference. Write us for free copy of catalog No. 23 ‘‘W” rs THE L. S. STARRETT CO. World’s Greatest Toolmakers Manufacturers of Hacksaws Unexcelled Steel Tapes — Standard for Accuracy ATHOL, MASS. me 90 e Starrett Tools © This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6.

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POPULAR SCIENCE MONTHLY “Be sure you send us STAR HACKSAW BLADES Weknowwhatthey’lldo” The shop foreman will never buy any other hack saw blade when he can save great waste from breakage by the use of Star Special Flexible Blades. Star blades have been recognized for their su- nerior qualities for a great reany years, and this new | c.ade is the supreme eznaievement of the oldest he ck saw makers. WRITE FOR FREE SAMPLE BLADES Clemson Bros., Inc. Middletown, N. Y. MAKERS SINCE 1883 STAR HACK SAWS | £A ie We Overhaul Our i titateaall and Make It Cut Like New By Lawrence B. Rossins SMOOTH RUNNING, clean cutting lawnmower gives zest to trimming the lawn, just as a freshly stropped razor does to shaving. It makes you feel like clipping the grass, in- stead of looking on it as merely another job. Ordinarily, the lawn- mower is @ much abused implement. It is sometimes a wonder that it goes at all. Dust and dead grass frequently choke the bearings; the blades are dulled and nicked by stones, tin cans and pieces of wire; and even the handle wobbles on its trunnions, Well, let’s give it a real overhauling this year and make the’ lawn cutting game q. joy instead of a task, | First, let’s give ita! bath of kerosene by! taking off each whed, and washing out every | bearing with an oll’ brush saturated with kerosene. Now you can see the parts of the machine. The blades are sup. ported on a_ frame called the cylinder, This runs on two cone bearings, one at each (Continued on page %9) = “HRA First thoroughly clean the lawnmower, especially bearings and movable parts, with kerosene and a stiff bristle brush If revolving blades are too loose, | the bearings at each end should be tightened, but not too much The _ stationary blade next should be adjusted (above) so that each re- volving blade will just touch it. This is usually accom- plished by loosen- ing one screwa fraction of a turn and tightening an- other one alongside it a similar degree The internal or pinion shaft and other parts should be well greased (above) Carborundum and oil or a valve- grinding com pound is smeared over stationary blade (at left) as the first steP in sharpening rS} This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6. | | | | | | | We end, al revolv any lo setscre der, or up the type 0 The the sta it just along | bind, | as the lower | the cy should ing ble Tur behind that t replace powde smoot! statior chine | Kee until ¢ chine hess b the st they a tevoly carbor station hecess the ex points Cle: Place and Parts maini nzit An help |

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Ys 1%, ich May, 1926 tie hiome Workshop We Overhaul Our Lawnmower (Continued from page 78) end, and should turn just freely enough to ‘revolve without any play. To take up ‘any looseness, turn up or down the two 'getscrews found at each end of the cylin- ‘der, or loosen the single setscrew and turn up the cone with a nail, according to the type of bearing. Then, by means of adjusting screws, set the stationary blade at the bottom so that it just touches ‘the revolving blades all along their length—not tightly enough to bind, but enough to cause slight friction as they pass by. It is good practice to | lower this bar before testing and adjusting the cylinder bearings, but in any case, it should be raised now to meet the revolv- ing blades. Turning on a short shaft on the disk behind each drive wheel is a small gear called the pinion. Back of the pinion is a small bit of steel called a pawl. This engages the blades when the mower is pushed. The points of the revolving blades, if too long, should be filed down on a slight bevel Pull off the pinions and clean the pawls. If they are badly worn, either buy new ones or make them from a piece of tool steel, hardening them afterward. Then put back the pinions, after oiling the pawls thoroughly. Smear the gear teeth and pinion shafts with petrolatum. A good method of home sharpening is to reverse the pinions, side for side, so that the blades will run backward, and replace the wheels. Mix fine carborundum powder with machine oil, work into a smooth paste, spread evenly over the stationary blade, and then push the ma- chine upside down along the floor. Keep pushing forward and backward until the blades will spin when the ma- thine is brought to rest. Test for sharp- tess by inserting bits of paper between the stationary and revolving blades. If they are not cut clean when the blades are revolved, repeat the process with more carborundum compound and adjust the slationary blade closer to the cylinder, if hecessary. A file can be used for beveling the extreme end of each blade where the Ponts are apt to be left too high. Clean off all grinding compound, re- Place the pinions in their proper order, and reassemble. All exposed movable Parts should be oiled thoroughly; the re- maining surfaces should be wiped with nzine or gasoline and painted. 4n occasional oiling will, of course, help to keep the mower running quietly. eo POPULAR SCIENCE MONTHLY 79 Men are quittin —by the millions—old-type shaving preparations for this unique creation. Accept, please, a 10-day tube to try GENTLEMEN: Five years ago Palmolive Shaving Cream was un- known. Today it is leader in its field. It is a unique creation. It differs immeasurably from any shaving soap you have ever tried. Eighty per cent of its users once were wedded to rival makes of shaving soaps. It is based on the four require- ments 1000 men named as their ideals of a shaving cream, plus a fifth . . . strong bubbles . . . which we ourselves added. We think you will like it. Sixty years of soap study stand behind it. The same careful study that made Palmolive Soap the leading toilet soap of the world. To add the final touch to shaving luxury, we have created Palm- olive After Shaving Talc—especially for men. Doesn't show. Leaves the skin smooth and fresh, and gives that well-groomed look. Try the sample we are sending free with the tube of Shaving Cream. There are new delights here for every man who shaves. Please let us prove them to you. Clip coupon now. © This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. May we ask you, then, the cour- tesy of trying it, both in your in- terest and in ours? These 5 Advantages 1—Multiplies itself in lather 250 times. 2—Softens the beard in one minute. 3—Maintains its creamy fullness for 10 minutes on the face. 4—Strong bubbles hold the hairs erect for cutting. 5—Fine after-effects due to palm and olive oil content. We think we have done a great job. You may agree, or you may not. But in fairness to us both, please give it a fair trial. Send the coupon. Do this today. THE PALMOLIVE COMPANY (Del. Corp.) CHICAGO ILLINOIS |10 SHAVES FREE| | and a can of Palmolive After Shaving Talc Simply insert your name and address and mail to Dept. B-1166, |] The Palmolive Company (Del. Cerp.), 3702 Iron Chicago, Illinois. Residents of Wisconsin Street, jf | | | | | should address The Palmolive Com- jj | pany (Wis. Corp.), Milwaukee, Wis. i See page 6.

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A one-pipe smoker finds his tobacco The problem of keeping an only pipe sweet, cool, and soothing has been solved by a Long Island haberdasher. On the chance that a number of pipe smoking readers of this magazine may be in the same predicament that Mr. Lilen- feld found himself two years ago, we pub- lish his letter for what it is worth: Richmond Hill, L. I. Larus & Bro. Co. Richmond, Va. Gentlemen: I am sorry I cannot compete with the gentleman who is the proud possessor of 45 pipes of all shapes, forms and makes. I am the owner of one poor solitary pipe. This pipe I have carried many long years. _At times it has been a good pal, soothing me with its cool, mellow smoke; but at other times—Lord, how it could bite! I was at a loss to ascertain the rea- son why. Every time I changed the brand I would imagine that I had discovered a new find; but when another new tin was bought it was never the same. Somehow or other I ran across Edge- worth. I believe it was recommended me at some cigar store. Since I was always ready to take a crack at anything I bought some. What a relief was the first pipeful! The old briar pipe became soothing again. Here surely was a find. I thought to my- self ‘Will it last?”’ Strange or otherwise it has lasted. I have now smoked Edge- worth for the past 2 years and believe me someone will have to step some to make me switch. Yours truly, 2 S. Z. Lilenfeld. Let us send you free samples of Edge- worth so that you may put it to the pipe test. If you like the sam- ples, you'll like Edge- worth wherever and whenever you buy it, for it never changes in quality. Write your name and address to Larus& Brother Company, 10 Q. S. 21st Street, Richmond, Va. We'll be grate- : ful for the name and address of your tobacco dealer, too, if you care to add them. Edgeworth is sold in various sizes to suit the needs and means of all purchasers. Both Edgeworth Plug Slice and Edgeworth Ready-Rubbed are packed in small, pocket- size packages, in handsome humidors hold- ing a pound, and also in several handy in- between sizes. To Retail Tobacco Merchants: If your jobber cannot supply you with Edgeworth, Larus & Brother Company will gladly send you prepaid by parcel post a one- or two- dozen carton of any size of Edgeworth Plug Slice or Edgeworth Ready-Rubbed for the same price you would pay the jobber. -4 On your radto—tune in on WRV A, Richmond, Va. - | —the Edgeworth station. Wave length 256 meters. POPULAR SCIENCE MONTHLY A Simple Way to Modernize an Old-Fashioned Fireplace design favor the projection of the chimney into the room. It should rise straight up from the front and ‘sides to the ceiling, or slope from the sides, or incline from the front and sides as well. If you have one of the old-style mantels in your living- or dining- room with a flat-topped mantelshelf, you can re- model it easily to con- form to one of the other designs, and in that way bring the room more in harmony with the mod- ern trend in interior decoration. For the design illus- trated, carefully remove the shelf by prying off the moldings with a chisel - and lifting the shelf upward. Make two brackets of 3 by 4 in. stock 12 in. long, and cut on the front edge of each a cove with a radius of 234 in. Cut a notch in the upper edge 434 in. back from the front end to receive a 2 by 4 in. plate, as shown in the sectional drawing. Locate the positions of the brackets near each end, say 12 in. to the inner faces, and with a small chisel chip out the face tile or brick to receive the brackets. Start near the center and chip very carefully to avoid cracking the tile or loosening it. The backing brick can be attacked more boldly. Nail the plate to the brackets and place the latter in the notches in the brickwork. Pitesien favor modes in fireplace SECTION THROUGH HTN) | H ine nia 4 | ‘ » i / /, Interior decorators favor fireplaces | built so as to give a lofty appearance | Return the plate to the wall at each end | by butting short pieces against the front plate, and secure the ends by nailing them to a strip nailed on the wall. This ground- work should be well leveled and flush with the faces of the fireplace. Plumb up on the wall to the picture mold from each end of the fireplace, and measure in at the top for a slope equal to the slope of the front. About 16 in. below the mold nail a 1 by 4 in. ribbon horizontally across the studs, ending at the slope lines, and nail 1 by 4 in. backing strips between the ends and the mantel plates. Cut three front studs to fit the slope against the wall, notching them around the ribbon and fitting the lower ends to the plates, and run up corner studs to slope both from the front and ends. Tack’up and test for alinement with a straightedge, and after any necessary alter- ations, nail up solidly. Where the light brack- ets are to come, cut pieces x4 RIBBON ]|NAILED TO WALL tween the outer studs, keeping them flush with MANTELSHELF WALLBOARD Sa ff A 2x4 STUD MA SHELF Ho i 2” * { fii 1z HALF acer i - a ly } = ot a Ee Mr), Le wR 4 NES SOD et (JOA sb ARh A CR = 8 false Alp ies p= vue 7 AE PN 34 BRACKET Cor G- Z'COVE Y ZL. RACKET YU. : TUD LA 2«4 PLATE ~ LL WY A | eeenaned COVE BACKING COVE ae SHELF 2x4" the outside. Bore accu- rately placed holes through which to bring in the wi- ing, which may be ex tended through loom from BACKING Brock. the wiring of the old on - brackets, or, in the ab- | JOINING OF sence of these, wires can of 1 by 6 in. boards be- | be tapped from the ceiling ' hei | MITER SHELF the built-out flue. HALF ROUND>4 frame should now reset The upper view shows a section through the shelf and upper framework. The lower detail is a plan of the shelf corner ble that in photograph. (Continued on page 81) © This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6. and brought down _ e| The | |

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V [= you and spring are thrilling to the first ball game of the year—and your favorite player drives out a homer—when the stands rise, roaring with cheers —have a Camel! Camels contain the very choicest tobaccos grown in all the world. Camels are blended by the world’s most expert blenders. Nothing is too good for Camels. In the making of this one brand we concentrate the tobacco knowledge and skill of the largest organization of tobacco experts in the world. No other cigarette made is like Camels. They are the overwhelming choice of experienced smokers. WHEN sspring’s first ball game is here. And a heavy hitter cracks the ball, shriek- ing into center-field for a home run—oh, happy mortal, as the stands roar with glee—have a Camel! For Camel adds the magic of its own fragrance to life’s most festive days. Camels are of such choice tobaccos that they never tire the taste. Camels are so skilfully made that they never leavea cigaretty after-taste. Spend what you ia get more pleasure out of Camels than any other cigarette you ever put a match to. So this fair spring day as the bases fill and a hefty batter lofts out one that it seems will never stop flying —oh, then, taste the smoke that means completed en- chantment. Know then the mellowest flavor that ever came from a cigarette. Have a Camel! Our highest wish, if you do not yet know Camel quality, is that you try them. We invite you to compare Camels with any other cigarette made at any price. R. J. Reynolds Tobacco Company

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If you like “Popular Science” you will like this Here is a practical service for practical home decorators: Sher- win-Williams, who originated the now famous Household Paint- ing Guide which gives authoritative information on correct finishes, have added a color service. You can now skilfully select a harmonious color treatment for anything, from a piece of furniture to a whole house. This, in effect, brings to any work you may do the full abilities of the experts in the Sherwin- Williams Decorative Studios. These color recommendations are reproduced in beautiful pic- tures and, like the Household Painting Guide, may be seen at “Paint Headquarters,” the live paint store in your community. Look for this store—you will recognize it by the sign. For a beautiful and valuable Sherwin-Williams brochure on home decorating send the coupon printed below. Write the Sherwin-Williams Company, Dept. E, 659 Canal Road, Cleve- land, Ohio. HOUSEHOLD PAINTING GUIDE STOPS MISTAKES IN PAINTING SURFACE TO PAINT USE PRODUCT NAMED BELOW TO VARNISH USE PRODUCT NAMED BELOW TO STAIN USE PRODUCT NAMED BELOW TO ENAMEL USE PRODUCT NAMED BELOW AUTOMOBILES... S-W Auto Enamel S-W Auto Enamel Clear S-W Auto Enamel AND SEATS AUTOMOBILE TOPS S-W Auto Top and S-W Auto Seat Dressing SWP House Paint S-W Concrete Wall Finish Old Dutch Enamel CEILINGS, Interior. . . Flat-Tone Scar-Not Varnish S-W Handcraft Stain Floorlac Enameloid Exterior SWP House Paint Rexpar Varnish S-W Oil Stain Old Dutch Enamel CONCRETE S-W Concrete Wall Finish DOORS, Interior... . || SWP House Paint Scar-Not Varnish Velvet Finish No. 1044 Floorlac S-W Handcraft Stain Enameloid Exterior SWP House Paint Rexpar Varnish S-W Oil Stain Old Dutch Enamel FENCES ......000.0. SWP House Paint . |} Metalistic S-W Roof and Bridge Paint S-W Preservative Shingle Stain FLOORS, Interior (wood)... S-W Inside Floor Paint Mar-Not Varnish Floorlac S-W Inside Floor Paint Concrete. . . S-W Concrete Floor Finish S-W Concrete Floor Finish re S-W Porch and Deck Paint FURNITURE, Indoors Enameloid Scar-Not Varnish Floorlac Old Dutch Enamel Porch . |} Enameloid Rexpar Varnish S-W Oil Stain Enameloid HOUSE = SWP House Paint Rexpar Varnish ye Old Dutch Enamel LINOLEUM......... S-W Inside Floor Paint Mar-Not Varnish S-W Inside Floor Paint RADIATORS........ Flat-Tone S-W Aluminum or Gold Paint Enameloid ROOFS, Shingle...... Metal -..... Composition S-W Roof and Bridge Paint Metalistic Ebonol S-W Preservative Shingle Stain SCREENS....... S-W Screen Enamel S-W Screen Enamel S-W Family Paint Rexpar Varnish Floorlac Enameloid WALLS, Interior (Plaster or Wallboard) Flat-Tone | SWP House Paint Old Dutch Enamel Enameloi IE 6 5 oh bon os otic Enameloid Rexpar Varnish Floorlac Old Dutch Enamel WOODWORK ee SWP House Paint Flat-Tone Scar-Not Varnish Velvet Finish No. 1044 S-W Handcraft Stain S-W Oil Stain Floorlac Old Dutch Enamel Enameloi For removing paint and varnish use Taxite. For cleaning painted and varnished surfaces use Flaxoap. SHERWIN-; PAINTS AND \ ©1926 S-W. Co. WILLIAMS VARNISHES Beautiful and Preserved S W P is the highest-quality house paint it is possible to manufacture. If quality pays anywhere it is in house paint. It costs as much for labor, with short-lived paint, as with S W P, which goes farther, covers better, holds its color and wears so much longer that it pays many times over. “There is no substitute for quality.” BEAUTIFUL COLOR IDEAS Send this Coupon Give us your name and address and receive, en- tirely free, a very special art brochure for lovers of beautiful homes. Lovely interiors and exteriors 1n colors. Samples of many popular shades—each correct Sherwin-Williams product, as specified on the Household Painting Guide. Send the coupon today, to the Sherwin-Williams Co., Dept. E, 659 Canal Road, Cleveland, Ohio. NAME, ADDRESS. surf retu scr arol of | side side an

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Miniature Kitchen Cabinet WO prizes—a blue and a red ribbon— were awarded at a coun- ty and a community fair Foie to the minia- _..- ~+«ture kitchen ft | cabinet _ illus- af E trated. I made : , this by follow- ing an article in the Janu- ary, 1924, is- sue of Poprv- LAR SCIENCE MonrTHuLiy. The cabinet was construct- ed of yellow pine with wall- board panels. It was given one coat of flat white and a thin coat of white furniture enamel. The ornamental design and _ initials were drawn outside the glass doors with a pencil-shaped piece of laundry soap and then painted on the inside with gold enamel.—Roy C. BRADBURY.

Remodeling a Mantelshelf (Continued from page 80) For the shelf, use 1 by 8 in. stock, well surfaced. Miter the corners, butt the returns at the ends against the wall by scribing them to the plaster, and notch around the false studs to give a projection of 114 in. beyond the bracket ends. Flush with the face edge on the under side nail a 2 by 4 in. piece, surfaced four sides. Miter the corners for 1% in., and shoulder the rest of the joint, as shown in the plan view. Glue this joint to the miter of the shelf, and further reinforce the miter joint by gluing and nailing under it a triangular “scab,” as indicated. So treated, the miter in the shelf should open very little through shrinkage. To support the rear edge of the shelf, nail a block against each stud, bearing on the plate and against the 2 by 4 in. piece on the under side of the shelf. Between the brackets nail a 114 by 11% in. strip flat against the under edges of the blocks and against the plate, and miter a 2-in. cove around under the shelf with this strip as a backing. Miter a 114-in. half- round molding to the shelf edge, showing a margin of 4 in. above. Cover the false studs with wallboard, carefully fitting the end pieces against the wall and mitering the corners. Decorate to match the room, and put up the light- ing fixtures. If it is desired to run the face of the flue plumb from the mantel face, nail suitable cure the upper ends of the studs. Where the fireplace itself is boxed in and the removal of the shelf would be likely to damage the woodwork, the up- per frame may be erected above the old shelf without further alterations, or a wider shelf can be built over the old.— Epwin M. Love.

cleats to the ceiling against which to se-,

© This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS, See page 6. POPULAR SCIENCE MONTHLY Just what does a ~YALE- _ Door Closer do ?

L

—=<=. eneck YZ ® THEN CLOSES IT QUIETLY y ‘2 Mr ° AND CLICKS THE LATCH DP

The Yale Door Closer is a door-closing power plant: perfect in action; made with the precision of a smooth-running en- gine; every part co-ordinated to the quiet closing of a door. As the door is opened the power of a highly tempered steel spring is stored up waiting for release. As the hand leaves the knob the spring unwinds, promptly starting the closing action, and at the right moment, controlled by a piston working within its cylinder against hydraulic pres- sure, the door gradually loses momentum and comes to a quiet stop as the latchbolt clicks in the jamb. Put Yale Door Closers on those Screen Doors this summer. No more noisy annoyance from slamming screen doors. No more half-shutting of the door, with flies entering in spite of the screen.

The Yale & Towne Mfg. Co., Stamford, Conn., U.S.A. Canadian Branch at St. Catharines, Ont. YALE MARKED IS YALE MADE

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82 POPULAR SCIENCE MONTHLY May, 19% May, W ood Turni th Lath » 6 . By Rurus E. DEERING yagi’ America’s Leading al . 9 — you believe W —W that you can make 7] Pipe rench hy? graceful, spirally turned legs for homemade furniture with <s the commonest of hand tools, th and do it more easily than ' you could shape almost any ke of the much commoner types of posts? Most beginners in woodwork would say it is TI impossible, yet the process is th really simple. The steps in shaping the spirals, which = can be made any size de- sired, are shown below. Ri 1 Cut a long strip of paper as wide as the y pitch desired, wrap it around the wood as shown at the left; then mark the spiral with a pencil 0! n ] Shape the part fi You can see with the ound with draw- c naked eye why the knife, pocket-knife, b TRIMO is America’s or a wood rasp. It si leading Pipe Wrench, need not be smooth having strength, dur- but should be round ability, economy and . convenience built into “ig t its whole make-up. Good ; i tools are the cheapest in dl the long run. V Three features make the s TRIMO America’s lead- l ing Pipe Wrench (1) INSERT JAW in the 3 Carefully saw a 4 , handle, replaceable when inch deep groove about worn (2) NUT GUARDS the length of the spiral that keep the wrench . adjusted in close quar- ters and (3) STEEL FRAME that will NOT break. Eight steel han- ; dle sizes from 6 to 48 4 Use the edge of a half ins. Four wood handle round wood rasp to sizes: 6, 8, 10 and 14 ins. deepen and widen the _ = narrow groove previously : THE TRIMO made with a hand saw § (Above) Fin- ish shaping the Monkey Wrench spirals with a rasp Is simple, strong and all | drop forged; has only Smooth very | four parts. Bhat guar- carefully with | nih ay a pend ame — dealer for these TRIMO aroun TOOLS—accept & (At left) Work no other. out knobs, balls, octagons and other _ TRIMONT MFG. CO. Hold a piece of sandpaper in shapes _ wood the palm of one hand and rasps and_ coarse pen eee. rotate the work to finish smooth- bastard files, finish- 303 ing the continuous spiral surfaces ing with sandpaper I el — IS] This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6.

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POPULAR SCIENCE MONTHLY 83 2 Tlome Workshop How I Improved My Cellar by Making a Coal Vault By Evucene L. Giese O KEEP costs down, the builders of many homes plan for small base- ments. In my home, this defect was remedied by building a coal bin outside the foundation wall. Besides affording more room, it allows the basement to be kept cleaner and to be put to more uses. The concrete bin holds six tons and has a manhole conveniently located for filling. The bottom slants rather steeply toward the coal opening in the basement. The forms for the concrete are placed in the excavation somewhat in the shape f = ARCHED TOP 6'THICK, REINFORCED | An excavation is made outside the cellar and a concrete vault or bin is constructed of a V, so that the top of the bin is noticeably wider than the bottom.. This facilitates the feeding of the coal to the coal opening in the cellar. The top of the bin is a foot or more below the ground so that it will not interfere with planting. Not until after the concrete walls have set for several days are the forms for the roof of the bin placed in position. The top is in the shape of a flat arch and is made of concrete at least 6 in. thick, with reinforcing, so that the roof will support a reasonable weight. The writer used steel lath for reinforcing the roof. A sliding coal door in the basement was found to be the most satisfactory. The frame was made from 2 by 8 in. material, grooved to hold a stout door. Have You a Good Idea? N CONNECTION with William Draper Brinckloe’s article, “How to Utilize Your Cellar,” published last month, we asked readers who have worked out good ways of using their cellars to send letters describ- ing their ideas to the Editor. Pay- ment will be made for letters suitable for reproduction. he suggestion in the above ar- ticle is of special timeliness, as many householders ran out of coal during the strike last winter and suffered great expense and inconvenience simply because their coal bins were too small to hold a winter’s supply. No. Bench Lathe Complete as Illustrated . Price $40 L rst is bench lathe makes your home shop “132 iLL “130 This lathe has the same construction as the No. 125 above, but is slightly larger. a real workshop co a jing j ei x Slide Rest Price $17.50 Counter Shaft Price $12 HERE are many turning and boring jobs you could do yourself if you had a bench lathe. Make your workshop more complete by adding to it this Goodell-Pratt Lathe. It enables you to do professional- looking work. Over-all length of this bench lathe is 25 inches; height, 1114 inches; swing, 7 inches; extreme distance be- tween centers, 12 inches. It weighs only 30 pounds. This lathe has a milled bed and a tail stock with milled base. Live spindle has a cone bearing to take up wear. The tail stock has both screw and lever feed. Cone pulley has 3 steps—14, 214, 3% inches in diameter. The lathe is finished with black and red enamel. All working parts are beautifully polished. A complete line of attachments is available to fit this lathe. Among them are a slide rest, lathe tools, com- pression check and collets, milling attachments, turret attachments, Bench Lathe No. 494 Length over all, 31 inches; height, 1114 inches; swing, 7 inches; extreme distance between centers, 18 inches. Net weight, 36 pounds, price 400-page Book of Tools FREE A postcard will bring you the 400-page pocket-size book of all the famous $44. 1500 Goodell-Pratt tools. In this book are shown and described many tools you will want to outfit your workshops completely. Every tool shown is _ beautifully made and finished by skilled toolmakers. Just let us know where to send your copy of the book. It is FREE. GOODELL-PRATT COMPANY - GREENFIELD, MASS., U. S. A. IS) Makers of Mr. Punch GOODELL PRA 1500 GOOD TOOLS — © This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS, See page 6.

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$4 POPULAR SCIENCE MONTHLY M ay, 19% May, Q - . e 4 How to Make a Rabbeted Joint By EmanvueEt E. Ericson, Noted Manual Training Authority & MATEUR ma mechanics 2 who nailand ] After face-marking = screw together the pieces, place one ; their woodwork member on the other nig without any pre- and even at the end wo tense at joinery and edges, and make a spi are missing haif mark in the inner cor- the fan of wead- ner as shown at left. 3Y working. Te Both pieces, it might de’ moke a workeee- be well to remind the ta] like joint gives real amateur, should have ste duliatt., This and carefully squared ends Tt similar articles to 1S] come will show 7 you the secrets of d : cabinetmaking. 0 You will find : many uses for rabbeted joints in th H b making furniture, and, indeed, in .. ere S all sorts of woodwork. Drawer = fronts, for instance, are often rab- F b beted to take the side pieces, in- x , Our best bet! stead of being dovetailed. Some- E see y * times this-is called an end-lap joint. . saa ee OOo o LEN __ é ; Ch h ‘ eney hammers ? STEEY Remove the vertical member and place the knife in the mark previously made. Then move a 1 When you pick a Cheney you try-square against the knife and Fe we beaseion draw a line across the surface. PICK a WI ° Continue the line halfway down each th 4 ‘ edge. On rough work a pencil is used ° 1 = oa ones mec a instead of a knife, but it is easier ‘” ot OF wear a = ven apuse. | k tel i i It’s a hammer that will be right on ee ee . the job long after most other ham- 3 (Above) Bet 0 4 es : mers have been put in the junk marking gage the piece in a vise a pile. for whatever and cut down on the | s amount of end gage lines with a rip- ti The first time you use a Cheney grain is to re- saw, beginning the you'll be tickled with the “hang” — ge in the cut on ne nearer 2 “ Shin” : rabbeted mem- corner. As you pro- ~~ he or lip ‘pie o ber—this may be ceed with the cutting, gi you ll recognize the real value O one half the thick- bring the saw level rc heads whose ends are tempered | ness, but usually ° g1 differently—each according to the |_ isless. vo fone a work it is to do, of wax-finished | the end and down b second growth hickory handles,| agiong the edges | and a system of wedging that keeps h the head tight. : That’s why for 90 years men v have been asking for the Cheney : Hammer. They’ve wanted the t hammer made of the stuff that stand the gaff. And there’s a real guarantee that it will stand the , gaff—even stand abuse—back of t every Cheney Hammer. s c 5 Lay the piece flat on a bench hook or fasten it in the vise and cut ‘ away the surplus wood with a cross- 1 * cut or back-saw. Beginners usually 6 Glue the joint and fasten with find it best, and it is always safest, to plenty of finishing nails or screws, cut a V-groove with a knife or chisel ) at the same time testing for squareness before making a saw cut of this kind © This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6.

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May, 1926 POPULAR SCIENCE MONTHLY 85 Wie Home Workshop Easy Way to Make Small Cupboard Doors By Donatp A. PRICE MALL cupboard doors with dovetail battens running the full width can be made quite easily. For instance, if a door 92 by 26 in. is required, cut the tongue- and-groove material approximately the right size. Nail it down lightly on the workbench or any other flat working space. The size of the cross cleats, in this case 3144 in. wide at the wider end, should be determined, and they should be given a taper of 14 in. to the foot, or, in this in- stance, made 21% in. at the narrow end. They should be about 2 in. longer than the finished width of the door. Both edges should be beveled as shown by the dotted lines. Nail the finished cleats temporarily on the door on their proper center lines so The cleats are tacked temporarily on the door as a guide in making the dovetail saw cuts that they will serve as templets for cut- ting the grooves. The small end should be placed a short distance inside the edge of the door, as illustrated, to allow for the thickness of the saw kerfs. This distance will vary from 1 to 2 in., accord- ing to the thickness of the saw. The saw can be guided by holding it tightly against the beveled edges of the cleat. Make the saw cuts 4 in. deep on both sides, remove the cleat and rout the groove to a depth of in. over all. Then round the top of the cleat, coat the groove with glue, and drive the cleat in as far as it will go. Cut off the ends and bevel them to give a neat finish. It is necessary, of course, to attach the hinges to the cleats. Variations of this method can be used for other work, such as making a shop drawing-board that will stay flat, in which case, however, glue the cleats only at the center to allow the board to expand and contract. A Rotating Harrow (Continued from page 73) bolt. Do not overlook the two washers that prevent the cramping of the parts. A handle, made from a piece of broom- stick, extends about 16 in. on each side of the tongue. As the harrow is pulled along, the spikes at one side stick into the ground while those on the other side slide over the surface, causing the harrow to re- volve, thus breaking up and leveling the clods.—Grorce G. McVickEr. ” the World of your door by the turn of a dial- because of Good Tools / When you hear the sweet, clear music from a concert over a thou- er? sand miles away you do not, perhaps, { think of the tools which have brought about this marvel. Wire, tubes, storage batteries, motors, generators, and microphones must be made i accurately. In their manufacture, ~ \ you would find hundreds of Brown IN & Sharpe wire gauges, screw pitch or gauges, micrometers and many other 2 ee tools for the accurate measurement oo of thousands of small parts.—You’ll Catalog No. 30 lists the com- f/ plete line of Brown & Sharpe i / | Tools and Cutters. Ask your dealer for a copy or mail a post card direct to us. Combination Squares and Wire Gauges are but part of the complete line of over 2, Broun & Sharpe {tf} Tools, There are hun- ai - dreds of these tools in daily i edi use both by manufacturers ~' of tadio equipment and by amateurs. BROWN & SHARPE TOOLS BROWN & SHARPE MEG. CO. Providence, R. 1. U. S. A. find Brown & Sharpe Tools on all an jobs where tools of the highest qual- i : ity are required. ee ee © This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6.

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UPSON-BOARD for WALLS Do you need extra rooms? Do you want to install extra partitions—make your attic livable? Try Upson Board on just one cracked or falling ceiling. Light in weight—easy to apply. Cannot crack. You’ll agree there’s nothing better. Is your house hardto heat? You can cut your fuel bill 20% to 30%—add needed rooms at the same time—by lining your attic with Upson Board. Identify genuine Upson Board by the Blue Center in panel edges. Eg] Bien LA Laboratory tests prove Upson Board 25% to 200% stronger than ordinary sheathings. Strengthens—insulates—enhances invest- ment. You are sure to have at least one use for Upson Board about your home. Why not try it onjust oneceiling? You’lllike it! Send 10c for samples and full-size detail blue int specifying use desired. Address The pson Company, 527 Upson Pt., Lockport, New York. WRITE FOR SAMPLES POPULAR SCIENCE MONTHLY May, 19% HE OLD game of solitaire will fur- nish a great fund of amusement for all members of the family in reward for a few hours’ work in making the board. It opens up a wide field for those of an inventive mind, who may delight in de- vising new forms of the game. Those of a mathematical turn of mind will find pleasure in discovering the underlying law that governs the position of the count- ers, making a solution either possible or impossible. Boards. may be made of any suitable material and embellished to suit the taste of the constructor. The simplest way is to draw on a board about 10 in. square any FIG.3 FIG4 FIG.5 Unusual variations of standard solitaire. game boards (Figs. 1, 2) are shown in Figs. 3, 4and 5 one of the designs illustrated, or an origi- nal one. Holes are drilled or punched at all the intersections. They are best if tapered, and the writer has used a center punch in making them, after grinding it to the taper desired. There is little danger of splitting the board if care is taken. To make the pegs, a handful of wooden skewers may be obtained from a butcher. A point is ground on the end of one with a pencil sharpener and the peg cut off to the proper length, about 1 in. A suf- ficient number of pegs can be made by this method in a short time. After the pegs are inserted, the problem consists of jumping them out, as in the game of checkers. A true solution is reach- ed when all the pegs are taken but the last, which should land in the central hole whenever the design permits it. If preferred, counters or checkers may be used instead of pegs, and round or square spots painted on the board in place of holes. Figs. 1 and 2 are the standard games of solitaire mentioned in dictionaries and encyclopedias. Fig. 3 is an old checker Five Curious Puzzle Boards By Artuur L. Smita puzzle adapted to the peg board. Figs, 4 and 5 are designs to show how new games may be devised. In Figs. 1, 2 and 5, pegs are put into all the holes and the player has the choice of removing any one in order that the jumping process may begin. In Fig. 1, a true solution is possible if the central peg is removed. In Fig. 2 it is doubtful, though it is left as an open question for the reader to decide, Solutions are given that leave pegs standing in all the circumferential holes while the last one lands in the center, but this does not seem to be bona fide. If a corner peg (indicated in the drawing by a circle) is removed, the pegs can be jumped out, but the last one will be most con- trary about landing in the center. In Fig. 5, the case is similar to that of Fig. 2. The pegs may be jumped out if the peg indicated in the drawing by a circle is removed instead of the central one. Twenty-four pegs are employed in Fig. 3. They occupy the two outer rows, while eight holes are left vacant in the center of the board. As it stands, a solu- tion is probably impossible, but it be- comes possible if, at the beginning of the game, one peg may be removed, or if one peg may be added in one of the two cen- tral holes, or if one of the inner pegs not in the lines connecting the double corners may be moved one space in. The player who tries to work the puzzle as it stands usually becomes confused after intense mental effort and uncon- sciously inserts or removes a peg and is delighted when all are jumped. In Fig. 4, a similar design is offered in which seven inner holes are left vacant. A true solution can be effected here, and you will be delighted to see the last man land obligingly in the center. The third article in this series by one of the foremost authorities on puzzles will appear in an early issue. A Quick Way to Make Rings RECENTLY devised t he method illustrated for making a num- ber of wire rings out of a_ closely coiled spring. After boring a hole slightly larger than the coiled spring through a_ block of wood, I made a saw cut to serve as a guide for a hacksaw and then placed the block and spring 1n the vise. Cutting through one side of the spring resulted in a series of rings, each of which could be closed and flattened with a few taps of a hammer.—W. J. E. SAW SLOT; 4 \ “SPRING Eas Sup © This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6. r l . V s ae = dx ne

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POPULAR SCIENCE MONTHLY

fie Home WorkShop Easiest Way to Wire Lamp By Grorce A. WILLoUGHBY Supervisor of Electric Work, Arthur Hill Trade School, Saginaw, Mich. ROM the shelf above his cellar work- bench, Fred Andrews, one of my neighbors, lifted carefully a pair of silver and blue candlesticks. “What do you think of them?” he asked. Before I could tell him how much I liked them, he went on: “You know I found them knocking around the attic. They must have belonged to my grand- mother. All I did was to wash off the dust and soot of forty years, give them a coat of gesso, and polychrome them. What I want you to tell me, though, is how to wire them for electric light.” “That’s easy,” I said, “‘but you'll need a hole all the way through for the wire.” “That was the first thing I did,” Fred said—‘‘bored a hole all the way through.” “Then you will need two short pieces of one eighth inch pipe, each threaded at

How to perform the six simple operations necessary in wiring a single electric lamp one end; two sockets, and some silk lamp cord. All you have to do is to en- large the hole in the top of the candle- stick—the same method, by the way, will do for any kind of small lamp you happen to be wiring—so that the short length of gas pipe can be pushed firmly into it. Now then, take the socket apart by press- ing the shell at the point marked ‘press.’ Screw the cap of the socket onto the small pipe, and push the cord through the candlestick, pipe, and cap. If it is too tight a fit, push a stiff wire through first and draw the cord after it. “Next, split the cord carefully, without removing the rubber covering, tie an Underwriters’ knot in it, scrape the in- sulation from the very ends, attach the wires to the socket terminals, and as- semble the socket in place.” Fred thought this was an easy way of doing it, as, indeed, it is. Frames for bed lamps, in particular, often are sold with a small piece of pipe in place, so that it is necessary only to cover the frame with suitable cloth and connect up the socket. It is essential not to omit tying the Underwriters’ knot. Mr. Willoughby told how on page 108 of March issue.

take hold / “The beaver,” says the encyclopedia, “builds his dam of stems and boughs cut down by his powerful teeth.” Beaver-like in their ability to take hold and finish their job are the teeth of NICHOLSON Files. Whether made for rough machine work, the home repair shop, or the super-fine filing of the jewelry craftsmen, these teeth are cut tn right to meet the particular nee They are tested again cro so and again —rigidly —be- » S<— 4 Ie fore they are sent to work. NICHOLSON FILE CO. IS) U.S.A. __ Providenoe, R. I., U.S. A. (TRADE MARK)

~a File for Every Purpose

1S) This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6.

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Whets your Appetite for Boring Holes “Yankee” Ratchet Brace No. 2100 Made for the man who values his time and labor, wants accuracy and efh- ciency, and sees the econ- omy of paying a little more for the finest tool of its kind. The charm which this wonderful “ Yankee” Ratchet Brace has for mechanics is easily un- derstood: It has a silent smoothness of action to which they have not been accustomed. For No. 2100 is made and finished like a pre- cision tool. The famous “Yankee” Ratchet works like the stem-wind of a watch. And the new “Yankee” Chuck is the most efficient ever made. Ball bearing, quick centering, and accurate. Slip into it any shape bit (round, square, any taper) and the bit is held in a vise-like grip. Yet chuck releases bit at a turn of wrist. Handles are hard rubber and indestruct- ible. Finished beautifully in keeping with its perfect mechanism. Some Other “‘Yankee’”’ Tools Ratchet Breast and . Automatic Feed Hand Drills Bench Drills Ratchet Screw-drivers Automatic Push Drills Push Braces Vises, Removable Base Dealers Everywhere Sell “ Yankee” Tools “Yankee” on the tool you buy means the utmost in quality, efficiency, and durability. Write for FREE “ Yankee” Tool Book. TOOLS Make Betliv Mechanica POPULAR SCIENCE MONTHLY May, 1925 You Can Make This Galleon (Continued from page 71) away the sides of the hull pieces B until use heavy cardboard, several thicknesses they fit the templets at the six construc- of thin cardboard glued together, or, tion lines II to VII. Hold the two pieces _ better still, glue together five thicknesses together and see that they match. If you of thin wood veneer with casein (water- deviate from the actual section lines, it is _ proof) glue. of no particular importance; the main Take a piece 51% in. wide and 18 in, thing is to see that pieces B are approx- long and cut it approximately to the imately alike. shape of the main deck D, Fig. 2. This, Glue and lightly nail pieces B to the as well as two of the other decks, will Nortu Bros. Mec. Co., Philadelphia, U. S. A. "YANKEE" IS} This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6. center piece, so that the construction need a slot at the ends to fit around the | lines on all three correspond. center piece, which makes the whole To lighten the model it is desirable, but rigid. Glue and nail the main deck in not at all necessary, to scoop out a lot of _ place (after noting the suggestions given the inside wood, leaving at least 34 in. later on in regard to fastening the bitts), at the edges. and trim the edges to agree with the side Bore the nine 3¢-in. holes for the can- _ pieces. non about in. below the edge, so that Cut two bulwarks from the same mate- the guns will point slightly up, and for- rial to the shape shown at C, Fig. 2, and ward and aft at the ends. (See Fig. 1.) in them cut the 14 in. square gun ports Obtain, if possible, a piece of Y-in. and the 4-in. round hawse hole. Bevel three-ply wood (airplane or waterproof the forward edge so that it fits snugly stock), which can be had from some veneer against the center piece. Leave 4 in. dealers in 2-ft. square pieces. Otherwise extra length at (Continued on page 90) ae ae ae SIDE BLOCK-B 256x32xI8" XN y -= --—=— — CENTER sles Ys, PLYWOOD 8x24 SIDEBLOCK __..-- 2% x3% x16 \ wo « y OT TO TAKE A NAIL WITH SQUARED END HATCH COVER’P. wxi%'x 12 ZX Ye SQUARES th Ue I LARGE FORE BITTS-U ee ree SIDE STERN *s07-= = STERN GALLERY GUN PORTS BITTS-T AND GARLAND OVERLAY OF GALLERY DECK : eels Fig. 2. The center board, the two side pieces and their six section lines, the five decks, the bulwarks and bulkheads, the hatch, gallery brackets, bitts, and gun ports are shown above our &¢ clined thing not at An and 7 mode idea make make Iti clear ready Nos. is for half | appe: 47 81 the s next send Po: cer sw toc ne Gem Gan Gad Eee Cod Od Ged 06 OD OD

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May, 1926 POPULAR SCIENCE MONTHLY (me Home Workshop, Blueprints to Help You Build the Galleon on Our Cover O MAGNIFICENT in line and color is the Spanish galleon ship model on our cover, that many readers may bt in- clined to say: “I never could make any- thing as intricate as that.” But this is not at all true. Anyone who can wield a pocket-knife and paintbrush can make this particular model. It has been designed with that idea in mind—a model beginners can make, yet one the most experienced model maker would recognize as authentic. It is necessary, of course, to have large, clear drawings, and these you can obtain ready-made by sending for blueprints Nos. 46 and 47 in the list below. No. 46 is for use in connection with the first half of Captain McCann’s article, which appears in this issue (page 71), and No. 47 supplements both the first half and the second half, which will be published next month. It will save time if you send for both blueprints at once. Nemington PORTABLE 3 M3 Remi nh For Home Writing! RITING by hand is out of date. The Remington Portable Typewriter has made it so. The Remington Portable is ever so much faster, and enables you to make copies of your personal writing without extra effort. It is a necessity of modern, fast-moving life. Graduation time will soon be here. What finer or more helpful commencement gift than a Remington Portable for the boy or girl who has college or business days ahead! It is the handiest, fastest, simplest to oper- ate, and most dependable of all portables— and it is the smallest, lightest, most com- pact portable with standard keyboard. Give yourself more leisure by saving time with a Remington Portable. You can pur- chase it on terms as low as $10 down and $5 monthly from Remington branches and dealers everywhere. Write today for our illustrated booklet, ‘““For You—For Every- body.” Address Department 67. REMINGTON TYPEWRITER CO. 374 Broadway New York Branches Everywhere Remington Typewriter Co. of Canada, Ltd. 68 King Street West, Toronto Complete List of Blueprints a ONE of the blueprints listed below can be obtained from Poputar Science Montuty for 25 cents. The Editor will be glad to an- swer any specific questions relative to tools, material, or equipment. Blueprint Service Dept. Popular Science Monthly 250 Fourth Avenue, New York GENTLEMEN: Send me the blueprint, or blue- prints, I have underlined below for which I inclose.............:. cents: No. Title Published Price 1. Sewing Table Feb., ’22 25c 2. Smoking Cabinet . Mier., °22 25c 3. End Table Age.,. °22 ~25e 5. Kitchen Cabinet May, °22 © 25¢ 8. Shaving Cabinet June, ’22 25¢ 9. Arbor, Gate and Seats July, ’22 25c 10. Porch Swing Aug., °22 25c 11. Bench and Tilt Table Sept., °22 25c 12. Electric Washer Get,, 7°22 25c 13. Tea Wagon Nov., ’22 25c¢ 14. Christmas Toys Dec., °22 25c 15. Workshop Bench Jan., “23 ‘'25c 16. Inlaid Radio Cabinet Feb., ’23 25c 17. Cedar Chest Mar., ’23 25c 18. Phone Table and Stool Mar., ’23 25c 19. Grandfather’s Clock Apr., °23 . 25¢ 20. Flat-Top Desk Apr., ’23 25c 21. Colonial Desk Apr., ’23 25c 22. Cabinet and Desk Apr., ’23 25c 23. Pergola Garage May, ’23 25c 24. Gateleg Table June, °23 25c¢ 25. Canoe Sailing Outfit july, °23 25c 26. Baby’s Crib and Pen Sept., ’23 25c 27. Kitchen-Cabinet Table Oct., ’23 25c 28. Pullman Play Table Nov., °23 25c 29. Toy Tea Cart, etc. BDec., °23 25c 30. Tool Cabinet, etc. Yan.,. °24 25c 31. Sewing Cabinets Feb., °24 25c¢ 32. Chinese Game Table Mar., ’24 25c 33. Dining Alcove Apr., ’24 25c 34. Garden Trellises May, ’24 25c 35. Simple Radio Cabinet Oct., “24 25c 36. Rush-Bottom Chair Nov., ’24 25c 37. Simplified Bookcase Dec., °24 25c 38. Sheraton Table Jan., ’25 25c 39. Salem Chest Feb., °25 25c 40. Desk in Sheraton Style Mar., ’25 25c 41. One-Tube Radio Set May, ’25 25c 42. Three-Stage Amplifier June, ’25 25c 43. Four-Tube Receiver July, °25 25c 44. Pirate Ship Model—Hull Feb., °26 25c 45. Pirate Ship—Details Mar., ’26 25c 46. Galleon Model—Hull May, ’26 25c 47. Galleon Model—Details May, ’26 25c NOE NES SOR Oa fas Se (Please Print) CED SAE Ane ee RR Ae Poem A [City and State Calta sha tkel shale od ice kee eee Eni ease TYPEWRITERS Remington made Paragon Ribbons and Red Seal Carbon Papers always make good impressions IS] This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6. st STANDARO NOISELESS TYPEWRITERS TYPEWRITER f QRTABLE ACCOUNTING TYPEWRITER MACHINES A MACHINE FOR EVERY PURPOSE

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Pexto Samson Ratchet Bit Brace OR the mechanic and for general home use, the Pex- to Samson Ratchet Bit Brace, illustrated above, will give a lifetime of dependable service and stand up under the severest ‘roughing. Its ball- bearing chuck gives the Pexto Brace a grip that never lets go. It will hold round, square or taper-shank drills. ‘The Samson is the kind for you—it’s a boon to the ‘“ home mechanic.”’ PEXTO TOOLS are carried by prac- tically all progressive dealers. The Peck, Stow & Wilcox Co. Southington, Conn., U.S.A. Worth While TOOLS POPULAR SCIENCE MONTHLY You Can Make This Galleon (Continued from pagé 88) | the after end, to be trimmed when in position. Steam the forward 6 in. of these pieces (unless cardboard is used) and glue and nail them to the hull, overlapping it 14 in. A rough block of scrap wood glued in the stern (Fig. 3) is helpful for nailing into. Note how this bulwark follows the “tumble-home” or inward slope the hull started. On the deck erect the bulkheads K and L (Fig. 5) of 14-in. plywood. K stands 14% in. high and slants forward a trifle; L is 13¢ in. high and leans aft. Cut both to fit between the bulwarks and bevel to meet the slope to the deck. Cut the decks E and F (Fig. 2) from *the 1%-in. plywood and glue on so as to overlap the sides about \% in. If the tops of the bulkheads are rounded to about % in. higher in the center than at the ends, that will give the decks a slope or camber, which is realistic and looks well. When in position the poop sides should leave a promenade deck about %% jin, wide on either side of deck F. As a protection for this promenade we shall need a handrail (Fig. 8). This isa strip of wood about 4 by 3 by 61% in. Bore fine holes along it at }4-in. intervals, drive small bank pins through these, and on each drop three or four beads, with a touch of glue to keep them in place. Then bore holes in the deck to correspond. Fig. 3. (At left) Center piece, side blocks, one bul- wark, and two bulkheads in place, with filler blocks in the stern. Fig. 4. (Above) The high stern with orna- mental overlay and Admiral’s gallery Erect bulkhead M, deck G, bulkhead N, and deck H, similarly. The overlays which cover the exposed faces of the bulkheads are of very thin wood (veneer), or cardboard painted to look like it. Doors and windows are cut in these. Door paneling is painted on and the windows are filled with celluloid, or silver paper. Sides are needed to enclose these high poop decks. Cut them from thin three- ply stock, with gun ports and windows pierced, as shown in Fig. 6. These pieces also require an ornate overlay. Fig. 5. Diagram showing the hull construc- . thing. Invert the handrail and tap into position. Cut the projecting pin ends off under- neath, or cut them before inserting. Small glass headed pins may be used at intervals. The rail is to be stained and the beads painted silver, but do not put these in position until almost the last Two similar but much shorter rails will be wanted for the forecastle. Cut or bend them to suit the curve of the bow. The stern board (Fig. 7), 314 in. wide and 3% in. high, is fretsawed from a piece of thin wood, (Continued on page 91) . . T i a tion on squares, each of which represents 1 sq. --BULWARKS C - | : ‘ OVERLAY- NN, _jpeck H. in., and a cross section. The heavy line repre- CENTERBOARD A sents the upper boundary of the center board ZZ = = ye peotes: od SIDE BLOCK }/ OVERLAY- MMM, = S Sf, 4 r | TERN aS ae YW ry ~ eee Bs LKHE OM | LLLLZ, / nece| F- ti : UH AD 4 J | Pret | d OVERLAY-LUZ | i 1.4 BULWARK-C SECTION ON LINE WV 1 bebop. : by ‘ : r{ ste Ve 1 STERN a eo x is f i e | purwiac SS a GALLERY] | ¥ DARK 2 -* > ff 0} eh ‘0 | 7: | BRACKETS | = : hi —— \i QANDR “etait to] r Se } ER nace ee AN ae Hi “¢ 8 HEA K: "| MAIN } OvERLAPOF | Ott FOR, GuN TSS | | KK! } DECKD’ BuLWARK¢ —)~ GUNS WHIT hfe -|-v-curs _| “1 |MOLDING & SQUARE | os jams | | | | DARK BROWN i 1 | | 1 or — a pit] WV V Vl vw a © This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6. suck dow cary pict you ma} ciga you any 34. j will wor fro beil dov line tha can awi T =AT

Page 95

er so en — © OD eo Hlome Workclhiojs You Can Make This Galleon (Continued from page 90) such as the lid of a cigar box. The win- dows are pierced and the whole lightly carved. In the center space, put a little picture of something symbolic, which you may paint yourself, or find ready. It may be a sacred picture, a device from a cigar box, or what you please. Perhaps you can touch it up with oil paints; in any case, varnish it well. The board is glued and nailed on with in. No. 21 wire brads, a box of which will be found invaluable all through the work. The figurehead shown in Fig. 7 is cut from a piece of 14-in. soft wood. Before being outlined with the fretsaw, it is cut down lengthwise as far as to where the line of the stem (piece A) crosses it, so that a 14-in. slot can be taken out and it can be fitted over A. Lightly carve it, cut away the center with a chisel, and fit it on the cutwater. Just behind this come the head boards (Figs. 1 and 6). These are cut from %-in. POOP SIDES STERN GALLERY 1h SQUARES” 5 er DECK GLU N BRACKET GALLERY DETAIL HEAD BOARDS Fig 6. The sides of the high stern and their ornamental overlays, the pattern for the Admiral’s gallery, and the design of head boards, which are bent as shown in Fig. 1 waterproof three-ply stock. The ends are beveled to fit above and below the body of the lion and to suit the cutwater, and the other ends to meet the bulwark. They will need steaming until they can be bent to the right position. Then they are glued and nailed. Other material may be used, as previously indicated. Across these and lying on them, comes a4 by \% by 3% in. spar (an early form of cathead), over which the anchor cable passes, The spar fits close under the bow- sprit, so do not place it until you try the latter. Before placing the head boards, bore two 4-in. holes through the cutwater, one under the lion’s tail, the other behind it (Fig. 7). Cut a piece of stiff, flexible cardboard to the shape of the overlay OO (Fig. 2), Pierce the gun ports and windows, paint it to look like wood, then glue and nail it on the under part of the stern, to follow the lines of the after part of the bulwarks and preferably inside them. Cut it in the first place a bit (Continued on page 92) POPULAR SCIENCE MONTHLY t Lowest Cost “Power Travel 80) SAFE, quick, comfortable miles to a gal- lon of gasoline; 800 miles to a gallon of oil; 12,000 miles from a pair of inexpensive tires — that’s low-cost power-travel! — that’s average performance for the Harley- Davidson Single [the new-type motorcycle]! Many people who own cars use this lowest-cost personal transportation to and from work, for quick errands and individual pleasure jaunts. No parking or garaging difficulties. Come and go quickly. Any 2 x 8 space will park or house it. Ample power for any road or hill. Safely balanced at all speeds. Easy to ride [learn in the length of a city block], and easy to pay for. Your Harley-Davidson dealer has a “Pay-As-You-Ride” plan for your convenience. See him. Hartey-Davipson Motor Co., Dept. PS Milwaukee, Wis. We want a live dealer in every locality. A money-making opportunity for real workers. If interested, check the coupon. he FIARLEY-DAVIDSON Movreveie | Single - amner ee os Milwaukee P NY, Deve! ot Sin ae R Che 2 Mi! e ab rion- 2 YDAVIDSON me free Et os aaa wee Ul eer =" Felt ee ee ee. ae cance Na Address ee eee IS) This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS, See page 6.

Page 96

MILLERS FALLS AUTO JACKS Nos. 130&14§ This is No. 130 Price = Balloon Tires? —Then here’s your jack! eet balloon tire is awfully flat, and only a special jack will go under the axle. Here it is— Millers Falls Balloon Tire Jack No. 130. It’s short—but what a reach! Double action gives it 1014" lift. Small—but it will pick up its share of any car. Two ton capacity—but your wife or daughter can operate it easily. Extension handle keeps user out from under the car. At hardware, auto accessory stores and garages—look it over—and ask about it. MILLERS FALLS COMPANY Millers Falls, Mass. 28 Warren St., New York 9 So. Clinton St., Chicago i ‘ Manufacturers of Mechanics’ Tools, Hack Saws and Automobile Tools This is No. 145— for regular tires. Easyand convenient operationisa feature. Extension hane dle, quick release device, adjustable base—strength and power—and only $5. Tubular extensionhandle is shown at right of jack (greatly reduced). 36” long when fully extended. MILLERS FALLS TOOLS SINCE POPULAR SCIENCE MONTHLY May, 19% You Can Make This Galleon (Continued from page 91) large and trim to fit; this is a good rule to follow in most cases. The lower edge of the stern board overlaps it. The Admiral’s gallery round the stern is cut from thin pressboard, heavy Bristol board, or other good cardboard. It is rather tricky to cut, but should be approx- imately as shown in Fig. 6. Try out the center cut until it fits snugly round the stern, when lying on the brackets, of which one is the extreme stern projection of center board A, and the others, Q and R (Fig. 2), are glued and nailed in position, two on either side and two on the stern. When the gallery fits, cut out the fretted parts with a sharp knife, bend up as indicated, bend in the forward ends, glue the flaps, place it on the glued brackets, glue the top edges, and spring them under the edge of deck F. Note the small sectional view in Fig. 6. The stern lantern is cut from a square piece of soft wood, as shown in Fig. 8. The windows are recessed and filled with silver paper, colored a transparent blue, and painted with diagonal bars. The corner ornaments are belt pins; the cen- ter staff is a large pin, which is threaded on a button mold, passed through the lantern, through another round mold, ----STERN BOARD GLASS-HEAD PIN; BEADS ee SS + ak = i a ae MP a \ peck-F-* 4 AFTER HANDRAIL Y"-3-PLY: -BANK PINS y~ cy - ren] a a i FORWARD DECK HANDRAIL O“GLASS-HEAD LADDERS PINS “PIN or ” Yara STICKS LANTERN DETAIL CAPSTIAN DETAIL Fig. 8. Details of handrails, ladders, cap- stan, and lantern. Note the ingenious use of pins and beads all through the design and then into the top of the stern board. The capstan (Fig. 8) is wood about 3, in. in diameter and % in. long, cut to the shape indicated. Drill %-in. holes through the head at right angles to each other and pass 114-in. long sticks through them for the capstan bars. A long pin or thin nail is driven right through the capstan into the deck. The main hatch (P, Fig. 2) is a block of soft wood, 34 by 14 by 14% in. The top is punched with the squared point of a large nail so as to represent a grating. The holes later are painted black, as is the lower half of the hatch; the upper part 1s stained a dark oak color. The six ladders are made from strips of very thin cigar-box wood glued together. The steps of each ladder must be exactly the same length. The lengths of the lad- Yy SQUARES Ye SQuarEs - STERN BOARD FIGUREHEAD Fig. 7. Half the stern board, and the figurehead, slotted to fit over the cutwater ders vary with the height of the various decks. You can attach thin brass wire handrails to them, if you wish. The bitts, one large (U) on the foreside of the foremast, one (T) on either side of the mainmast, and one (T) before the mizzenmast, are made from _ square sticks either 3% or 1% in. square as shown in Fig. 2. The cross pieces are recessed into the uprights and glued. The best way to attach the bitts is to glue them to the deck and fasten them with tiny screws from underneath, but that neces- sitates placing them before the decks are laid down. Another method is to cut holes in the deck, and glue the bitts very firmly into them. In that case, leave the vertical members of the bitts long enough to project into the deck. At the lower edge of the orlop (lower) deck, there should be fastened a -in. molding, glued and lightly nailed. Another molding about 1% in. square should be glued in line with the top of the open part of the bulwark, from the stem to the gallery. Some decorations may be painted between this and the top of the bulwark, forward and aft. Below the lower molding, give the hull two coats of white paint; above it, two coats of light blue, as shown on the cover. The center piece and bulwarks are stained dark oak and all the woodwork then is |. given one coat of varnish. The surface should not be glossy. Next month the rest of the fittings and the rigging will be described. Those readers who live in New York City and the vicinity will have an opportunity to see the original model of the Spanish galleon made by Captain McCann in the window of an art gal- lery at the corner of Fifth Avenue and 54th Street. The exhibition will be held from April 19 to April 24 and possibly longer. Other models to be shown by Captain McCann will be the pirate model ship of our Blueprints Nos. and 45; the Torrens, which was Con- rad’s last ship; the Wanderer, the last American whaler, and two 17th century decorative models. ne A © This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6. the se deflec or fal Tw and f Betwe 1 in. down upper bar t! the ¥ screw Unde adju: bar, 1 screw the t plainl As centel This i with » The ¥-in. neces: and t: grind: the s grind! abras As faster of %- flush top fc to us true Wher true furth | lower

Page 97

Bled heal eae | Se ee I<.

Ul ( =m Co CD i eo lS i ee, ed

May, 1926

ie Home Worlkslo A Hand Planing Machine (Continued from page 74)

and then a cut washer is clamped under the head of the cap screw. The screw G has a handwheel, which ig used to advance the table. The block His screwed to the table and the hole for the screw is a free fit to allow for the deflection that occurs as the table rises or falls when the handwheel is turned. Two blocks, marked I, are made up and fastened to the frame at either side. Between these two blocks is a steel bar lin. square, with the ends turned down to fit the 44-in. holes drilled in the upper ends of the blocks I. This cross- bar then is tapped at the center to take the 4-in. U.S. S. thread provided on the srew G. This arrangement allows the

Under view of the forward table showing the adjusting ways and spring for taking up play bar, which acts as a nut, to turn as the screw is deflected with the rise and fall of the table. The construction is shown plainly in the photographs on page 74. A stiff spring N is arranged to pull the center of the forward table downward. This insures its remaining in close contact with the ways at all times. The tables, A and B, were made up of ¥-in. plates of machinery steel. It was necessary to place them on the planer and take a light cut. Blocks of wood and grinding compound were used to polish the surface. Emery and oil or a valve grinding compound may be used for the abrasive. As described previously, the tables are fastened to the ways and rests by means of -in. cap screws. ‘The heads are sunk flush in holes counterbored in the table- top for this purpose. It may be necessary to use shims in order to bring the tables true with the head and knife edges. When the front table is finally brought true with the head, it will require no further shimming, as the raising and lowering of it will not throw it out of parallel. The construction of the ball bearing head is the feature requiring most care. The bearings used in this instance were salvaged from an automobile: transmis- sion. They are approximately 2% in. in outside diameter and lin. in_ inside diameter. The exact measurements of the bearings must be known before the end plates, or bearing carriers of the head frame, may be bored out. Likewise, conform to the actual measurement of the inner cone of the bearings. It may necessary to change the general plan of Mounting the (Continued on page 94) An article on Simple Pocket Knife

Carving will appear in an early issue. ———

the shaft will have to be turned to |

POPULAR SCIENCE MONTHLY 93

In love affairs always second best She had been explaining palm- istry to both of them; but when it came to a demonsttra- tion she held his rival’s hand, not his. “Nothing to worry about,” he thought bitterly to himself, “except that I can’t understand why it is a/qways like this.” Always in love affairs, he came off second best. — A great many young men are in- clined to have a grimy-looking skin, spotted with blackheads and dull in appearance. Few realize that this hinders their success in life. Pom- peian Massage Cream helps you overcome this handicap by giving you a clear, ruddy complexion. SPECIAL INTRODUCTORY OFFER V3 of 60c jar for 10c For 10c we send a special Trial Jar containing one- third of regular 60c con- tents. Contains sufficient Pompeian Massage Cream totestthoroughly its wonderful benefits. Positively only one jar to a family on this excep- tional offer. assenne tre aM

Clears the Skin. Pompeian Massage Cream thoroughly cleanses the pores. It helps clear up blackheads and pimples by stimulating healthy cir- culation, and by keeping the skin clean and the pores open. Easy to Use. Afier shaving or wash- ing, rub it in gently. Continue rubbing and it rolls out, bringing with it all the dirt and skin impurities. Result —a clean, healthy skin with clear, glowing color.

Use Pompeian Massage Cream regularly at home —then you'll get the full benefit. At all druggists.

| THE POMPEIAN CO., Cleveland, O., Dept. 47 : 60c jar of Pompeian Massage Cream.

Gentlemen: I enclose a dime (10c) for 4of a : : Street SET SCC CCR TERE eT

IS} This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6.

Page 98

aa “ATKINS” —A “Lifetime” of Saving! AVE time—save labor—save ma- terial—save money in YOUR home >} with an ATKINS No. 53 Home Saw! “Silver Steel” makes it outlast two or three ‘‘cheap”’ saws. ‘* Taper Grind- ing’ makes it cut faster and easier. 3 RAIA IE RARE AAP ARRAN ATONE ONION ON OLN Ask for our inter- esting folder ‘‘Saws in the Home’”’ or in- formation on better saws for every use. E.C. ATKINS & CO. Established 1857 Leading Manufacturers of highest Grade Saws for Every Use; Saw Tools, Saw Specialties, Plastering Trowels, and Ma- chine knives INDIANAPOLIS, U. S. A. Le: =a CAA sTeELOAWS i ie 3 o POV LAO LEV PLEI WV PIIA EF FEV FP OPI PPP ALIS LALE OLE PPFD EEA IGP AILS AIS SPIELE POPPY SA AAP AAA ow POPULAR SCIENCE MONTHLY [Gee Hone Workanap, A Hand Planing Machine (Continued from page 93) bearings. The simplest possible idea is indicated in the drawing. It is a good plan to arrange the construction to ex- clude all dust and dirt. This is usually a matter of providing felt and dust washers of thin metal on each side of the bearings. These appear in the finished machine, but not in the drawing. The head and the shaft were con- structed from one piece of 3-in. machinery steel, After the bearings were on hand, the ends were turned to the proper diameter and shouldered as in- dicated in the drawing. The knives were made from tool steel. This was purchased in strips % by 1 in. and cut to length. It was hardened be- tween steel plates which kept it in a plane. The temper of the blades was drawn to between a straw and purple. The knives were finished to about % in. wide by grinding. It might be possible to obtain the tool steel already hardened and tempered. HE chip breakers are sheet steel !% in. thick. The grooves, which are 34 in. wide, are provided with a rake of 15 degrees, which seems to be about the angle generally given jointer knives. Chip breakers and knives are held in position by means of safety head setscrews. The head may be grooved in the shaper, miller, or planer. When set up for this operation the cylinder is slightly relieved just ahead of the chip breaker. The construction of a square head would have been easier, but the one shown conforms to safety head practice. The rear table is provided with a groove or rabbet. This is to facilitate the cutting of rabbets in lumber. One end of the head carries the belt pulley, and the other end is left long, in case it is desired to mount a special cutter knife or a small grinding wheel. If this is definitely planned, it would be well to turn on threads and provide collars for mounting a 3% by 6 in. stone. A simple fence, C, may be made from a piece of 4% by 4 in. cold rolled steel mounted on short blocks, D, of the 1 by table allows the fence to be moved. Sliding Rest for Hand Grinder O MAKE it easier to sharpen plane bits and chisels on my hand grinder, I bored a hole’ end- wise through the tool rest and then made a clamp to slide over the wheel as illustrated. The plane iron or chisel may be clamped on this sliding rest to get | any bevel desired. It is also possible to | tip the tool back to inspect the edge | without removing it.—A. C. BruNDAGE. 3 in. stock. These are clamped to the rear | table and a row of holes drilled across the | © FN BO), A PATCH AND LIGHT THE FUEL NO GASOLINE You Need This! It’s the Easiest Way to Fix Punctures You can’t help but make a perfect pune. ture repair with this handy little Shaler 5-Minute Vulcanizer — it’s so simple and easy to use. In an emergency, when you get stuck on the road with a “flat,” you can depend on it to make a heat-vulcanized repair that will last, in just a few minutes, The Shaler costs so little that you should carry it in your car—always. After you use it once you'll know why motorists used fifty million Shaler patches last year. Complete outfit includes vulcanizer and 12 Patch-&-Heat Units. You can get it wherever auto supplies are sold for only $1.50. Slightly higher in Canada and far West. C. A. SHALER CO. , Waupun, Wis., U.S.A or choice of 44 ‘ Lace gt sizes in the famous Mead Wi o uld | d use a month as your own, whe agree to show your bicycle EF to ten or more of your friends and Ww — ld You: low factory price, easy terms, unusual conditions and compton offers we would make, all of which we will explain to you if —— ten — of see- ing this you will say ina letter or ona postal rticu- lars of Bicycle Offer” and address your coer card or letter to MEAD CYCLE CO. Dept. D250 Mead Block, Chicago (“Uh aeliiaeum SAVE ae GRADEA coon : y handy man can ine , atalr his own plumbing = ‘heating by our new, method. Free installing pleas show youhow. You save waste and high labor cost with our cut-to-fit system. Fifty years of economy service to home owners, farmers, builders and mechanics. Million dollar plants behind our guarantee E BOOK ae everythin in plumbing and heating fixtures and supplies. rite today for copy. HARDIN-LAVIN COMPA 106-16 West Pershing Road, cae: Ti. BLISHED ESTAS 70 WADE BENCH LATHE| 4in } ragth, Lin, dia. x a entire length. of bed. 8. No. 2 Lathe, back-geared headstock Vary pa line of ee at nn eR Catalog 8e3 Dept. P. S. 11, 120 Liberty Soest. New Yo rIS} This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6. screw the s this | end ¢ the e ing 1 the |

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———— Ss | ad m, cle nd 03, ce, > ‘u- to J E K POPULAR SCIENCE MONTHLY Cheaply Improvised W ood-Lathe By Owen Lovejoy OW I made a serviceable little wood- turning lathe at an expenditure of $3 is shown in Fig. 1. The only thing pur- chased was the small polishing head; the motor was taken from a discarded vac- uum cleaner. The lathe has proved to be powerful enough, nevertheless, to turn out any job within the scope of my home workshop. The first part to be made was a sliding member of wood. This is clamped in a Inexpensive polishing head converted into a lathe for turning work between centers Fig. 1. vise at the left of the polishing head and allows different lengths of wood to be turned. To this tailstock was fitted a vertical foot, which determines the height of the dead spindle on which the work rotates. For this spindle a long, stout wood screw was set right through the vertical block, after its tip had been pointed smoothly on a stone. A short piece of broom handle then was sawed off and bored so that it could be screwed on the live spindle. The end of the spindle projected far enough beyond this piece to fit into a central hole in the end of the work to be turned. To engage the end of the work positively, two finish- ing nails were inserted in the section of the broom handle and cut off with a hacksaw about 1% in. beyond the end of the broomstick. An upright member to support the turning tool was clamped ‘to the edge of Fig. 2. for turning relatively flat work on a faceplate The same homemade lathe set up the bench with a large C-clamp. A hand- screw, of course, could be used instead. When the work is set up in the lathe, the screw that forms the dead spindle is tightened into the wood by means of a Screwdriver. Thus vibration is practically eliminated. (Continued on page 96) The Telephone and Better Living Pictures of pre-telephonic times seem quaint today. In the streets were horses and mud-splashed bug- gies, but no automobiles and no smooth pavements. Fifty years ago homes were heated by stoves and lighted by gas or kero- sene lamps. There was no domestic steam heating or electric lighting, nor were there electric motors in the home. Not only were there no tele- phones, but there were no phono- graphs, no radio and no motion pictures. The telephone permitted the sep- aration of business office from fac- tory and made possible the effec- tive co-ordination of widespread activities by a centralized organ- ization. It changed the business habits of the Nation. The amazing growth of the coun- try in the past fifty years could not have come had not science and in- vention supplied the farmer, manu- facturer, business man and family with many new inventions, great and small, for saving time and labor. During this period of marvelous in- dustrial progress, the telephone had its part. It has established its own usefulness and greatly accelerated the development of the industrial arts which have contributed so much to better living conditions and to the advancement of civilization. AMERICAN TELEPHONE AND TELEGRAPH COMPANY AND AssocIATED ComPANIES GEAR ¥ BELL ( SYSTEM a IN ITS SEMI-CENTENNIAL YEAR THE BELL SYSTEM LOOKS FOR} WARD TO CONTINUED PROGRESS IN TELEPHONE COMMUNICATION Make Read the Money Making Opportunities on pages 116 to 142 of this issue. kore O0u00 8B} & This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6. Handiest Calculator” More Mone ~ World's SUBTRACTS”” NEW 08 $11 do, the work of a large $300 onthe naan =, ity 9 9,99. Total visible at all times. Clears with pull of the Bossy Nor A TOY, but an indestructible portable ma- chine GUARANTEED five years. So compact that it fits in vest pocket. Accurate. So simple a child can operate it. Instructions with every machine. Everybody should carry one for figuring as it is suitable for any use where numerals are dealt with. REE TRIA " NO MONE d and give your a an On delivery pay AGENTS: ($3.50 - outside U.5.). Just write ‘‘Send me a Baby “Calculator” address. We will ship Calculator immediately. en $2.50 plus few cents —. af not sorties qitet 10-day trial, you get your money back. THOU- ANDS OFS ISFIED USERS. This is lowest priced practica portable cainedianer made. onl any more for inferior imita- sight. tions?’ Order from this ad toda BABY CALCULATOR SALES co. P. O. Box 1118, Chicago, III. Every business firm, man or woman will 1 buy this machine on BIG COMMISSIONS. Dept. 50.

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Make big money from repair work Practically every household spends at least $10.00 to $50.00 each year and many spend several times that much on simple repairs that can be made quickly, easily and well with Smooth-On No. 1 By keeping a can of Smooth-On handy, you can save this money in your own home—and by doing similar repair work for others, you can make money. - No skill is required to make re- pairs, and the amount of Smooth-On used on any one job seldom costs more than a few cents. Typical repairs that can be made perfectly wtth Smooth-On:— Stopping leaks in steam, water, gas, oil or stove pipes, mending cracks, breaks or leaks in furnaces and boilers, radiators, tanks, sinks, pots and pails, making loose handles tight on umbrellas, knives, hammers, brushes, drawers, etc., tightening loose screws, hooks, locks, door knobs, etc. On the _Automobile:—Making bursted water jackets and pumps good as new, stopping leaks in radiator, hose connections, gas tank and gas, oil and exhaust lines, mak- ing a fume-proof joint between exhaust pipe and tonneau heater, tightening loose head- =emeg light posts, keeping grease cups, hub caps, and nuts from loosening and falling off, etc. To get perfect re- sults, write to us for and use the Smooth-On Re- pair Book. Free if you return the coupon. Get Smooth-On No. 1 in 7 oz., I-lb. or 5-lb. tins at any hardware store or if necessary direct from us. Smooth-On Mfg.Co. Dept. 58, 574 Communipaw Ave. JERSEY CITY, N. J. Band” SMOOTH-ON > Band for L/, | forcing- > s: y) SmoorH-ON AA into leak Leak at radiator joint stopped with Smooth-On Write for FREE BOOK SMOOTH-ON MFG. CO., Dept. 58, 574 Communipaw Ave., Jersey City, N. J. Please send the free Smooth-On Repair Book. SOOO OOOOH HHO HEH HEH ee ees eee eeee eee seeee® Return this coupon for a FREE copy of Booklet POPULAR SCIENCE MONTHLY Cheaply Improvised Wood Lathe (Continued from page 95) Fig. 2 shows the operation of a simple faceplate for flat work, such as small trays. It was made by drilling an octag- onal block of hard wood to screw on the spindle of the polishing head, so that the spindle projects about \% in. beyond it to center the piece being turned. Through this block were set two rather heavy wood screws, long enough to project into the work about 14 in. In use, this plate is screwed first to the piece for turning, after a small hole has been made in the latter to center it on the spindle. For a tool rest with this device, the adjustable sliding member of the first illustration is turned on its side in the vise. It is really surprising what can be done in the way of turning small novelties and furniture ornaments by these simple means. In Fig. 3 is illustrated an improvised drill chuck that the writer has used in drilling both woods and metals. It saves a vast amount of tiresome hand work. A section of broomstick was drilled out to screw on the opposite end of the polish- ing head from the lathe. Then, by means of a 4-in. wood chisel, the other end of the broomstick was turned hollow and tapering while the spindle was rotating. The chisel was rested on a suitable sup- Fig. 3. How the polishing head is fitted with a broomstick chuck to serve as a drill port while this was being done. Into this tapering hole, which was, of course, precisely in line with the axis of the spindle, the square base of a bit-stock twist drill was driven firmly, care being taken not to split the broom handle. With a little care the bit was centered nicely, and by it the writer has drilled as large as a \4-in. hole in strap steel. Since the piece drilled was held in the hand as shown, a precautionary measure was used not indicated in the illustration. A stout wire was looped to form a ring around the drill bit, and bent sharply so as to fit through a small hole drilled through the middle of the section of broom handle. Though the bit never showed a tendency to fly out of its chuck, this wire guard made such an eventuality impossible. It is evident that with this drill, a hole to be drilled in iron must first be marked by a sharp blow with a punch. Mr. Lovejoy uses the same polishing head for sawing. Next month he will describe the homemade saw table he made to aid in doing accurate and speedy ripping and cross-cutting. May, 19% this Year-Make ita Real Vacation UST an ordinary rowboat — and the Super Elto! Then you have a power. ful launch — giving you thrilling, foaming speed — taking you where the big fish wait — furnishing the finest sport in the world for the entire family, The Super Elto is compact — carries snugly on the running board of any car. Light—merely a “one-hand” carry, EASY STARTING! Even a child can start the Elto. Starts on the quarter-turn flip of the fly wheel! Genuine easy starting — the most vital single quality ever built into an outboard motor. RELIABLE! New Super model gives /3 more power— same weight and price. rite for new 1926 catalog— intensely interesting! ELTO OUTBOARD MOTOR COMPANY Ole Evinrude, President Dept. W Mfr's Home Bldg,, Milwaukee, Wis. “Starts on @ quarter turn* Super ? SEND NO MONEY Genuine Fall Cut Diamonds -*°, Terms If Desired—6 Months No. 6132 — Solid to Pay. Outside U.S. Gold Men’s Initial $ 2 S = with Order or Emblem Ring. 2 Genuine Wy, Diamonds 20 Cash 14-Kt. White Gold Top. Gold Emblem (any Lodge) or an initial(Old English’ yellow or white Gold, inlaid in Gen- uine HOPE RUBY Also, in Black Onyx New No. 6133 Reg. Trade Mark This Suarantecs you genuine diamonds. Neo. 6598. Any initial (raised gold) or Eastern Star, Rebecca, Mason, Shrine, Q K. of C. emblem instead of initial if \ desired. Send number of ring, size of finger, initial or emblem desired and No. 6598 — ting will be sent for inspection, Ladies’ Ring tak Ask for Free Catalog Genuin p15 Black Onyx with Bete Xanoner tower Genuine Full Cut Dept. A Diamond. 14-Kt. 601 Washington St., | Buffalo, N. Y. White Gold. ADDING MACHINE Fits Vest Pocket/senp No A marvelous calculator. Does the work] MONEY accurately and quickly as a $300 machine. In- > d mone valuable to anyone whe uses fi jures. ont Don’t sen dat) uy carry and pencil. s 8 invention will a. all problems ina minute. Business —_ few cents postage students, fessiona i] this HANDY HELPER. fem enor 10 devs. Counts HTH Your money p= To | ion if not satis’ Results i sight E a the tines chears "Ss G5 steel ay ‘in handsome eigh 7 \ case, fits vest it; we t iM, only 30z. Send for yoursnow 4 -you’llsave time and money. Reliable AddingMachine Corp., Dept. 155 1 0, til. 84 W. Washington St., —— é dy chance to e@_money. AGEN Ts et BE one. Fine profit. Write fot new offer. 7 fran SS Ae te Eels, Min 'Muskrats ~ Catch Fish stnstinisre: nunben wi our new folding galvanized ST EEL WIRE anil It catches them like a fly trap catches flies.. Write tor OF, FREE TRAP OFFER, Bargain Catalog of Fishing Supe sb. & Formula on best Bait known for catching all kinds o ‘WALTON SUPPLY CO. Dep. 19 St.Louis, ther ando' ae © This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6. In anot sienna ' liquid t In sti was to ] thin co | about a /a time, ‘liquid » | NTE | l and | simulta | for eac’ | predon | larger : | in at in | In app | somew | that o | softly. | The | crump | consta | face of | The kind i: | old gi | cheese | it doe | some | prefer i and | | produ vany s effect | move | patte | Th | way, | cil be | off tl | S° | VO ¢ light towa | sider iby t | tone | off a | cont clea effec ie | abo mix way | ligh | are | and | Wot | yf | hoe | wil | for a tio pl on eze

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it =e OS |e

May, 1926

i Tome Workshop] Be Your Own Decorator (Continued from page 72)

In another container a little of the burnt sienna was also mixed with the glazing liquid to the desired tone. In starting the stippling, the first step was to prime the undercoated wall with a thin coat of clear glazing liquid, doing about a yard and a half width of wall at a time, from ceiling to floor. The tinting liquid then was brushed on generously.

JN THE living room. the ivory drop black | I and the burnt sienna were applied | | simultaneously, using a different brush | for each color—the black, which was the _ predominating color, being applied to a | larger area, and the sienna being spotted in at intervals and in varying sized spots. | In applying, the colors were run together somewhat and blended with the brush s» that one color would go into the other softly. The stippling was done with a cloth, crumpled and held loosely in the hand and | constantly changed to present a clean sur- ‘face of the cloth to the paint. | The texture of the effect in work of this kind is governed by the cloth used. Soft old gingham is usually desirable, while cheesecloth is generally undesirable, as it does not have sufficient body. With some effects, where a coarse texture is preferred, burlap is used. By a twisting and lifting motion, beautiful scrolls are produced. By twisting the hand without /any side motion, a rosette or flowerlike effect is obtained, while a sweeping side movement produces a more branching pattern. The dining room was done in the same | way, with the colors selected, and a sten- | cil border design was applied later to set | off the effect. | QOMETIMES a “blended ” effect is pro- | duced so that the walls will be very ‘light at the top, growing gradually darker toward the bottom, where there is con- siderable depth of color. This is produced by tinting a batch of glazing liquid to the tone desired at the bottom, then pouring off about half of the mixture into another container and adding an equal part of dear glazing liquid, to give the light effect desired at the top. The light mixture is brushed down |about two thirds of the way; the dark mixture brushed up about one third of the way, carrying the color well up into the lighter color. The light and dark mixtures i blended together by brushing back and forth. Stippling is started at the top. | Working down into the darker color. | A few experiments on a piece of wall- | board or even on heavy wrapping paper will reveal the many possibilities. It will be seen that there is much room for working out individual effects in “Tiffany” decoration, through modifica- tion of tone and texture, so that the com- pleted effect may be made to represent one’s individual taste.

Sponge stippling, which is another fasy method for the home decorator, Will be described by Mr. Elliot in an early issue. You'll want to try it, too. eet

POPULAR SCIENCE MONTHLY 97 Only the Auto-Set has _ |i this time-saving feature HERE is a Sargent feature found in no other plane. The cutter of the Auto-Set may be removed, sharpened and replaced without changing original adjustment. If you are now using any other plane, you can imagine how much time and trouble this saves. Furthermore, despite the simplicity of its arrange- ment, the cutter of the Auto- Set never chatters, even when you are planing across or against the grain or over knotty surfaces. For the smaller jobs, you need the Sargent Steel Block Plane. This is as carefully made and finished as the Auto-Set. Its cutter, as in every Sargent plane, is of durable chromium steel. Both of these planes should be on every school and home work-bench. They are professional tools through and through—yet they are most moderately priced. See them at your hardware dealer’s and write us for descriptive booklets. SARGENT & COMPANY, Manufacturers 50 Water Street New Haven, Conn.

Sargent Steel Block Plane No. 5206

Sargent Auto-Set Block Plane No. 714 ARGENT

! PLANES a

IS} This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6. $100 DOLLARS IN CASH PRIZES © See Page 4 in front of book for details | Let Boice Help You Build It! No matter what you want to build, Boice can help — >? an Fe. <a)

you. He’l! send you the Boice-Crane Handisaw or any other Boice-Crane machine on Monthly payments. He gives you un- surpassed prices and values with a pos- itive money-back guarantee. Machine shown will saw, sani, grind, miter, rabbet, tenon, ete Sturdy, accurate, economical. Saws 1!s-inech stock. Sold with or without motor.

Write today, for Descriptive Catalog of Bench Saws, Drills, Jointers and Band Saws and the Boice E-Z Pay Plan. W. B. & J. E. BOICE Dept. P. S. 5-B, Toledo, Ohio

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98 CARPENTER Knows hammers He says: “No job is too tough for a Maydole. It’ll stand any amount of pun- ishment. And it’s got a ‘hang’ that helps you get the most out of every stroke with- out tiring your arm. ““You never see a Maydole with a loose head, a chipped face or a broken claw. That’s because it’s made right. No trick ‘features.’—Just a real hammer.” The Maydole Hammer is backed by eighty-four years of specialization in fine hammers. Head is press-forged of tool steel tempered separately at each end. Handle is of clear second growth hickory, air-dried for years. . Your dealer will gladly show you the genuine Maydole Hammer in any of the following types: Nail Hammers Ripping Hammers Machinists’ Ball Pein Hammers Automobile Hammers Brad Hammers Farriers’ Hammers Engineers’ Hammers Riveting Hammers Tinners’ Hammers Patternmakers’ Hammers Bricklayers’ Hammers, etc. Write for Catalog and useful Pocket Hand- book 23-B. POPULAR SCIENCE MONTHLY May, 19% THE DAVID MAYDOLE HAMMER CoO. NORWICH NEW YORK 9045 ; Cut out the broken plaster (upper view) and moisten edges thoroughly with water (lower) By F. E. Tustison and O. P. ScHELLINGER RACKS and holes are common blemishes in the average plastered wall. These do not always indicate that the plaster is old and worn, for even new work is likely to have ugly cracks at the corners if the house settles unevenly. A nail, picture hook, or the continual bumping of chairs, toys and other objects often cause unsightly holes. These small defects are easily repaired by one who takes pride in keeping his home shipshape. All loose material should be removed before any patching is attempted. With a broad knife or putty knife, scrape out the broken plaster until a solid foundation has been obtained. Cut any small cracks a little deeper so as to provide ample opportunity for the new plaster to adhere to and interlock with the old material. If the edges are un- dercut, the patches will hold better. With a small brush or sponge, wet the surrounding plaster. How to Patch Damaged Plaster Easy Way to Conceal Cracks and Blemishes in Walls ~ The patching plaster is mixed with water (upper yiew) and then applied with a trowel hardware or paint stores. They do not set rapidly, will not shrink to any cea- siderable degree, and often contain the sizing that otherwise would have to be applied separately before any decorating could be done. Plaster of paris alone is used extensive- ly by the trade for patching small defects. The mechanic mixes a small amount with water and then proceeds to work it off his hands into the crack with a small trowel or putty knife, wetting the surface in or- der to trowel it perfectly smooth for deco- rating. The objection to plaster of paris is that it sets rapidly and shrinks away from the old plaster at the edges. A bet- ter mixture is two parts of plaster of paris and one part of hy- This is to help the newly applied ma- terial to stick and to keep it from set- ting too rapidly. A second wetting im- mediately before applying the plaster is desirable. Special patching plasters are recom- mended for the am- ateur. These plasters drated lime, mixed with thin glue or decorators siz. Cement colors may be mixed readily with plaster for re- pairing a color wall. The plaster can be mixed in a dis or, better, on a flat pallet of some kind. can be obtained in small packages at If a trowel is not at hand, a kitchen knife, spatula or an ordinary putty knife will serve The plasterer woul probably mix 4 (Continued on page 99) SS el © This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6. ‘if la ih \t | it | | | | plaste May, 1926 small : A sir | few ml part of dle or W hile t mucl | to be ¢ | the cr num | of plas ave t If | ‘cial p | ter 1 | water | spoon. | trowel ure is Wit | flush | acle « | the ex For water _ a rol piece into moti \ foun App alm toh whic rous Wol "hee | ver | sue | wh

Page 103

u- is small amount quickly on his “hawk.” | 4 simple hawk can be constructed in a ‘few minutes from thin box material and ‘part of a broken hammer or hatchet han- ‘dle or a broomstick. It is well worth- | ghile to make one such as that illustrated ifmuch patching has ‘to be done, as when the cracks between a number of sheets ‘of plaster wallboard have to be filled. If the commer- cial patching plas- ter is used, adc water slowly and mix with a large spoon, or work the mixture with a small trowel or table knife, until a stiff mix- | ture is obtained. With a small trowel or table knife, plaster the mixture into the hole until it is flush with the surface. Hold the recep- tacle or hawk below the opening to keep the excess from dropping to the floor. For a smooth finish, dip the trowel into water and stroke to an even surface. For “HAWK” OF THIN BOX MATERIAL For holding plaster 14"x 14" ee | To match the various rough plaster finishes, tub the patch with a carpet-covered block arough finish, use a block covered with a piece of old velvet carpet. Dip the block into water and rub down with a rotary motion. With extremely large breaks, it will be found better to make a two-coat job. Apply the first coat over the lath and fill almost flush with the surface Allow this to harden, and finish with a second coat, which may be troweled smooth or rubbed tough, as desired. FOR LAYING cinder beds for concrete walks and in doing various kinds of work with cement, the home owner often needs a heavy tamper. One can be made | Very easily from heavy wooden blocks, |such as the cuttings from floor joists, Which can be obtained for the asking almost anywhere from a frame build- ing under construc- tion. Select a straight-grained piece of hard wood for the handle and nail the blocks on as_ illus- trated, so that each block runs at right angles to the one above. Use plenty of large nails. Tamper for Cement Wooden tamper for leveling a cinder bed POPULAR SCIENCE MONTHLY 99 SIMONDS CIRCULAR SAWS PLANER KNIVES a q GOOD TOOLS STOP WASTE Continuous production is dependent upon good tools —tools that last—tools that do not lose their cutting edges in hard service. The name Simonds on cutting tools is a guarantee of dependability— of quality born of a near century’s experience in making cutting tools of specially treated steel. Next time- -specify Simonds E. i Ee ar a 6 i = & : os lg ig **The Saw Makers” _ SIMONDS SAW AND STEEL COMPA FITCHBURG, MASS. Branch Stores and Service Shops in Principal Cities wien 1832 Cabinet Shop Specia No. 10 a © You ought to have this handy Parks in your shop! A compact, complete machine designed just like a big production outfit at one-fifth the cost. Nothing extra to buy. Motor is in- cluded, operating from any light socket. Fits in a corner of your basement. Does any kind of cabinet and joinery work. Cir- cular saw, jointer and bandsaw on per- manent all-steel frame. Add lathe, shaper and other attachments at small cost. You can make money with this Parks! Write for circular. The Parks Ball Bearing Machine Co. 1547 Knowlton St., Cincinnati, Ohio Canadian Factory: 200 Notre Dame East, Montreal, Canada ARK | ; | | | WORKING) brett (| willie Makes a Man Wish He Had Two Chins Barbasol produces such a silky shave. And easy—well! No brush. No rub-in. Just the blade and Barbasol. You try it —three times — ac- cording to directions. 35c and 65c tubes. . The @. Barbasol a Co. # Indianapolis 4 Ind. I enclose 10c. Please send trial be. tu I MMIN ck o ciewh eer aee % POMIOEB oss ies hi ee ex 4’ a Coo eer eerecercccceeeeeeesese 4 P-S-M-5-26 2) oo | | | | MACHINES a For Modern Shaving 1S} This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6.

Page 104

* He flepusits $500 a month” “CQEE that man at the receiving teller’s window? That’s ‘Billy’ King, Sales Manager for The Browning Company. Every month he comes in and deposits $500. “Three years ago he started at Browning’s at $25 a week. Married, had one child, couldn’t save a cent. One day he came in here desperate—wanted to borrow a hundred dollars—wife was sick. “T said, ‘Billy, I’m going to give you something worth more than a loan—some good advice—and if you'll follow it I’ll let you have the hundred too. Take up a course with the International Correspon- dence Schools and put in some of your evenings get- ting special training. The schools will do wonders for you, I know. We’ve got several I. C. S. men right here in the bank.’ “That very night Billy wrote to Scranton, and a few days later he had started studying at home. Why, in a few months he had doubled his salary! Next thing I knew he was put in charge of his de- partment and two months ago they made him Sales Manager. It just shows what a man can do in a little spare time.” * * Employers are begging for men with ambition—men who really want to get ahead in the world and are will- ing to prove it by training themselves in spare time to do some one thing well. Prove that you are that kind of man! tional Correspondence Schools are ready and anxious to help you prepare for something better if you will only make the start. Do it now! At least find out what the I. C. S. can do for you. Mail the coupon for Free Booklet INTERNATIONAL CORRESPONDENCE SCHOOLS Box 7691-D, Scranton, Penna. Oldest and largest correspondence schools in the world Without cost, please tell me how I can qualify for the position or in the subject before which I have marked an X; BUSINESS TRAINING COURSES The Interna- POPULAR SCIENCE MONTHLY

Industrial Management Personnel Organization Better Letters Business Management Salesmanship Advertising Show Card Lettering Business Law Stenography and Typing Banking and Banking Law Business English Accountancy (including C.P.A.) UO Civil Service Nicholson Cost Accounting Railway Mail Clerk Traffic Management Bookkeeping Common School Subjects Private Secretary High School Subjects Spanish OOF rench Illustrating TECHNICAL AND INDUSTRIAL COURSES Electrical Engineering Architect 1Architects’ Blueprints Contractor and Builder Architectural Draftsman Concrete Builder Structural Engineer Chemistry (€ Pharmacy Automobile Work Surveying and Mapping Airplane Engines a ep ed 0D Mining Agriculture and Poultry Steam Engineering () Radio (J Mathematics Electric Lighting || Mechanical Engineer | |} Mechanical Draftsman [| |Machine Shop Practice |) Railroad Positions [JGas Engine Operating Civil Engineer

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Any handy man cap install his own plumbing and heating a | cur new, easy method. ree installing plans show you how. You save waste and high labor cost with our cut-to-fit system. Fifty years of economy service to home owners, farmers. builders and mechanics. Million dollar plants behind our guarantee. FREE BOOK shows everything in plumbing and heating fixtures and supplies. Write today for copy. DIN-LAVIN COMPANY 106-16 West Pershing Road, Chicago, II.

ESTABLISHED 1876

Shipshape Tome] (Continued from page 99)

IcE BOXES and

I mproving refrigerators usu- Your Ice Box ally have such short legs that only a shallow pan can be placed under- neath to catch the drip. In hot weather the pan may require to be emptied sev- eral times a day. To provide space for a deeper drip pan or a good sized bucket and also to reduce the amount of stooping the housekeeper has to do in using the refrigerator, we

Stand for ice box designed to allow a large pan or bucket to be placed under the drip pipe have made it a practice for many years to build a solid frame or pedestal from 8 to 10 in. high upon which to set our ice box. The legs of the frame are 4 by 4 in. yel- low pine; the platform and girts of 34-in. pine strips. Casters may be put in the legs to make it easier to move platform and box when the floor or wall has to be cleaned. It may be thought that raising the ice box higher above the floor would make the ice inside melt faster, but no appre- ciable effect of ‘this kind has been ob- served.—HEnry JERVEY.

SOMETIMES when one is repairing furniture, working with veneered wood, or scraping a veneered surface for refinishing, a piece of veneer will be chipped loose from its base. If the piece is replaced in its original position, then steamed a few seconds by placing a fairly damp cloth over it and pressing down with a hot iron, it will be re-glued firmly in place again. After the damp cloth has been removed, set the hot iron directly on the veneer. It will soon be thoroughly dry. Should there not be enough glue re- maining on the veneer to stick, apply a little liquid glue and try again. After the glue is dry, sandpaper the — surface Replacing Loose Veneer

smooth.—R. E. D.

Oe I atways keep my Painting paintbrushes in Rough Work cans partly filled with raw oil, as suggested in an old issue of PopuLar Science Montutiy, and from time to time have to change the oil as it becomes thickened with paint. Instead of throw- ing it away. I pour the oil and any edds

and ends of paint I have left, in one | large can and use = (Continued on page 101)

a) " ° Qa. = 8 ° Pr =] e Was SSS iN i} < o 2 a ise] x a] © " z 5 8

Hear this creation of the originators and oldest makers of loud speaking devices, Alfred Graham & Co., Eng- land. Clear, life-like tone, supreme sensitivity and broad musical range explain its world-wide leadership in popularity. Six models, including pho- nograph units, with cordsand panel plugs, at$l2up. Write for “Amplion Pedigree,” THE AMPLION CORPORATION OF AMERICA: Suite M, 280 Madison Avenue, New York Chicago Branch: 27-29 North Morgan St, Burndept of Canada, Ltd., Toronto

&

“THE MOORE PEN CO. BOSTON: MASS. yap where you can try a pen~at the pen counter - Where writing qualities are apparent: -

Moore pens are not on sale at every store ~ at better stores everywhere: -

PricesReduced On All Standard Make TYPEWRITERS LowestpricesinYears « <q AEs Wewillshipanymake "3 eee you choose for one @(z airy week’strial. Underwood, yt Royal, L. C. Smith, Rem- ington, Woodstock, etc. Easy Terms f2¥

anteed as good as new. Perfectly re - manufactured by experts — the famous Fouss Process.’’ Send for our free trial offer and low prices now. WRITE TODAY. AGENTS WANTED EVERYWHERE. SPECIAL OFFER NOW. YOUNG TYPEWRITER CO. 654 W. Randolph St., Dept. 1425, Chicago

Direct from Factory 00 buys_ this ) OE A BOL r torpedo body in gray prime = your Ford. put cial hood and but let nose shell. Wrtte for Catalogue AMERICAN TOP & BODY CO.

the cons chie It is woo pen! roug Al ond wor ticu han use plas lade mat as | ace lust ; pie tog rari out wer The sep the por are sere in | sho or,

Lake St. Delphi, Ind._ |

© This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6.

fro. the the sta gro | the | anc hol wit

Page 105

a 3 i bl POPULAR SCIENCE MONTHLY (Continued from page 100) the resulting paint to weatherproof in- conspicuous woodwork around my lot, chiefly my homemade wooden sidewalks. It is excellent for coating joints in outside woodwork and, when thinned with tur- pentine, as a ground or priming coat for rough woodwork.—Eric B. Roperts. : ALTHOUGH there is A Quickly Made a stepladder in al- Stepladder most every house, frequently a sec- ond ladder would save a good deal of work if one were to be had. This is par- ticularly true when ceiling work or paper hanging is to be done and it is desired to use two stepladders to support a long plank. In such cases, or when no step- | ladder at all is available, it is a simple matter to make one from scraps of wood as shown in the accompanying il- lustration. The two side pieces are nailed together tempo- rarily and cut out as if they were one piece. Then they are separated and the steps, sup- ports and braces are nailed or screwed securely in their place as ' shown.—R. M.S. For light repair work AN OLD auto tire serves very well as a means of pre- venting stray dogs, or, for that matter, mischievous boys, from tipping over the garbage can. Nail the tire in a horizontal position against Holder for Garbage Can the fence, post or wall near which the can | stands, placing it at a distance from the ground equal to about half the height of the can. Lift up the garbage container _and set it bodily within this useful holder.—C. L. MELLER. A COMBINED anti- rattling device and window lock may be made from a common auto door and window anti- rattler, which usually can be obtained for ten cents. Saw off the rubber disk and grind the end of the screw to a point. Fasten in place on the sill or against side of window and screw the point in- to the sash far enough to make a mark. Then coun- tersink the head of a flat-head wood screw and screw it in place to serve ba : as a socket for re- — (eae ceiving the point- WOOD SCREW ed end of the anti- rattler.—F. J. WILHELM. Stops Windows from Rattling \ An anti-rattler in use ‘eee “B.V.D.” From its special- ly treated nain- Unior Suit (Patented Features) Men’s $1.50 the suit Youths, 85c SVE." Shirts and Drawers 85c the garment It always bears this red-woven label—-> OR the matchless comfort, fit and wear, that have given “B.V.D.”a generation of world-leading pop- ularity— sook, woven in our own mills, to the last detail of its scientific construction “B. V. D2 is: an underwear with differences that count. They give “B.V. D.” a qual- itv as unique as the fame of its trade-mark. Be sure to SEE it’s “B.V.D.” MADE FOR THE (BV. DI! - eee meee ees come enene BEST RETAIL TRADE ? ‘wade Mark Bag, US.Pat. Off, and Foreign Countries TheB.V.D. Co.,Inc.,N.Y. Sole Makers “B.V. D.”? Underwear © 1926 The B.V.D. Co.,Inc. (E NA ( ( iit LAA Mn I EE OT ETE Tee = IAM 16 inch x 8 foot Quick Change Gear he h | | TT Screw Cutting Lat “aa New Lathe © Soe Catalog Free! Shows 96 styles and sizes from the smallest Bench Lathe to the largest Factory Production other Lathe made. The New South Bend Lathe sells at attractive prices—each one a remarkable value. Write for Free Catalog. Easy Payments if Desired South Bend Lathe Works $22 East Madison St., South Bend, Ind. iA a Lathe. Describes— The NewSouth Bend Lathe New York aheavier, stronger Latheof greater belt pow- : Write for er—equal in accuracy and precision to any illustrated circular “(SS hi © This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS, See page 6. tively boxed. You can’t imagine how smooth and pleasant your morning shave can be until youtry the new Vibro-Shave Electric Safety Razor. Its electric- ally operated blade, vibrating 7200times a minute, is the secret of this new, scientific method of perfect shaving. Send us $10.00 today, and we will send youthe § complete outfit, including face and scalp massage attachments, five blades, cord and plug, attrac- f | Your money refunded without question within five days if you are not satisfied. J | Vibro-Shave blades last three times | _as long as ordinary blades y | For Use With 110 Volts Alternating Current Only | RAZOR PRODUCTS CORP. | 1440 Broadway h Dept.-A —— A VIBRO

Page 106

102 FRANK SIEGRIST, bril- liant young trumpet soloist, three seasons with White- man, uses a Conn. You-t6o, can. win success in Music IEGRIST earns a princely salary for his brilliant solos. His mastery of the highest register amazes his hearers. He uses a Conn trumpet because, he says: “the intonation, valve action, and im- mediate response give added confidence in my playing.” There’s profit and pleasure in music. You can fit yourself for it quickly. Start now to cultivate your musical bump witha Conn trumpet, saxophone, trombone, any band or orchestra instrument. Brief, pleasant practice enables you to win pleasure and profit. Send now for free book and details of Free Trial, Easy Payments on Any Conn Instrument: INSTRUMENTS ‘WORLD'S LARGEST MANUFACTURERS OS Ve ee ee Rome me Po. G. CONN, LID. S2Conn Bula, A OB Bl Elkhart, Ind.’ Please serid, free, “*Success | in Music’’ and details of trial offer on Powel Crosley, Jr., has developed in CRESCENDON a device that gives this LL TUBE RADIO performance expected in sets of muc eennes: COSt ««aaae 4-29 Write Dept. 17 for booklet THE CROSLEY RADIO CORP. Cincinnati, Ohio West of the Rockies add 10 per cent toall prices Dealers sell Crosley Radios from $975 10 $75. and the Musicone Loudspeaker at $1475 POPULAR SCIENCE MONTHLY May, 19% Old Bill Says— ONG attention to small details, hard study, patient waiting, and usually a good many reverses and dis- appointments are a part of the game of learning to be a good mechanic. Half of the job is setting it up. Use lard oil when available for taps and dies; it saves the tools and does better work. When bolting down a job on the planer and screw jacks are used, always place a hard block of wood, cardboard or paper under them, so they hold better. The best mechanics need the least supervision. Old Bill, machine shop foreman Mistakes need not be looked for if you keep the words vigilance and cau- tion ever before your mind. Every mechanic should have a fairly good knowledge of shop mathematics if he hopes to make progress. When using a square-nose planing tool for finishing cast-iron, be sure to chamfer the rear edge so that the tool will not dig in; and chamfer the front edge so that it will not break off and leave a rough surface on the work. The machinist who has traveled about a little and worked in several shops is usually more resourceful than one who has not. Why does one grind a twist drill fre- quently, yet seldom ever think of grind- ing a tap? How to Make Accurate Shoulder Measurements on Large Work AKING measurements of distances beyond the capacity of ordinary measuring tools is a part of the day’s work for the man operating a big lathe MEASURING ROD _ 19°. 6%, | =_er DETAIL OF cite 4152 66 A steel rod is a convenient and reliable means of checking the measurements on heavy work or planer. There are several ways in which this is accomplished, that is, with the use of steel tapes, measuring sticks, two-foot rules, or steel rods. The method depends on degree of refinement required, If the work is to be duplicated o, repeated in the future, a steel measuring rod is by far the most convenient and reliable means of checking the measure. ment, and it forms a permanent record, It is especially necessary on those classes of work that require the distances to be held within fairly close limits, say !/¢4 in, in a length of from 15 to 20 ft. To make a measuring rod, select a piece of cold rolled steel from 14 to 3% in, in diameter, cut it 144 in. longer than the length to be measured, and point one end as shown. The next step is to lay off the distance on some flat surface such as a large surface plate, a planer table, or a lathe bed. Clamp a parallel block squarely in place for a starting point and measure from this with a scale, scribing a line at each step until the final distance is marked off, Then clamp a second parallel at this point. The two parallels will serve as a gage for checking the rod. Try the rod, note the surplus length, and turn it back until the rod will go between the blocks. If the rod should be only slightly long, it may be filed on the ends until it goes. If, on the other hand, it is slightly short, it‘can be stretched by peening the middle. File a flat spot near one end, stamp the size, and the rod will be ready for use. It is manipulated in the same manner as calipers or an inside micrometer.—L. H. How to Prevent Blueprints from Curling in a Drawer LUEPRINTS and tracings that are kept flat in filing-cabinet drawers have a tendency to wrinkle and curl up at the edges. When a drawer is being closed, the sheets often catch and are torn or wrinkled. This is especially apt to occur when the drawer is well filled with the prints, and is annoying to any- one who prides himself on his neat work. A simple way to prevent the prints from catching is to drive three 2-in. fin- ishing nails through the back of the drawer about in. from the top. When the back edges of the sheets are slipped under these nails, there is no danger of their becoming curled. The sheets are held under nails at the back Tue PRACTICE of resharpening files is sel- dom if ever economical. Some of the larger may be recut by factories making a specialty of such work, but resharpened or recut files do not give as satisfactory service as new files. It is doubtful if any economy is effected by their use owing to their shorter life. As a rule the saving }5 not sufficient to offset the difference 1 the cost of a new file. © This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6. May, 1926

Page 107

POPULAR SCIENCE MONTHLY

103

Make Your Watches, Clocks, Etc., Visible by Night The very latest discovery in the scientific world. Hitherto tically unobtainable except at ri exorbitant price, we have monte last in producing this remarkable LUMINOUS P . which, applied to surface 7 a art am emits of wh white | a rancor rit jectly vii ARKER THE NIGHT, THE wor RILLIANT SHINES. Quite a > ne—you c: ttlen to the dial of your imp! an do it. watch or clock will enable you to tell the time ie night. a can coat the push buttons or switch plates of your electr match boxes, and inner are Re eteining euficheut oi uminass I small ‘srtisise, Priee 28e° Lance’ je containi' ien several sma leg 5 eh figes SOc and $1 postpaid. Johnson Smith & Co..Dont. 522 Racine. Wis. Microphone Transmitter Button

You can easily make a highly sensitive detectophone by using this Transmitter Button to collect tle sound waves. ou can build your own outfit without buying expensive ® equipment. It is simple and inexpensive. You can install BA an outfit in your home and hear conversations being held all ma over the house. u can connect up different rooms of a hotel. This outfit was used by secret service operatives = fis ing the war. It is being used on the etase. It is ultra-sensi- ive and is the greatest invention in micro-phones. You can 4mount the button almost anywhere—card board boxes, etove a pipes, stiff calendars, on the wall behind a picture frame, cte. utton is so lisht and small it cannot be detected. Persons can be overheard without suspecting it. You can listen in on conversations in another room, leaf pereon in the audience can hear the epeaker. Connected to phones us piano or other musical instrument, music can d hundreds of feet away. Button may be used to renew telep! none trans- aes often makes an old line “talk-up” when nothing se will. The ideal microphone for radio use; carries heavy current and is exieganale Pannitive, Amplifies radio signals. Countless other similar Experimenters find the Button useful fap hundreds of hones, amplifiers, loud speakers, ete. Many fasci- as holding the button against the throat or chest i v . $5.00 is given to anyone who sends in new suggestion for the use ch the! Button providing the a find it suitable for use in their literature. ICE $1.00 POSTPAID ae JOHNSON SMITH&CO..De 522: Racine 2g S. BABY Y TANK © —_— Yankee

Pep—by its own power Most remarkable Toy ever in- vented. By drawing the Tan# backward, either with the hand or over the floor or table and then placing it down, it wl al in th overcoming wil Cc gall obstacles, in the same Lon pan to wind up as is usually lerstood with mechanical slong ten times longer, isp wil oxcinaey = most wonderful stunts; it wi - ackwar Price only 25 cents p' INVISIBLE INK The most confidential can be writ- fon with this this Ink, for MAKES NO we get this tank will keep ploddi Veta 4 eal I per form dozens of will, 2% inches long. yy SOOK on Egos SPLICING

inj all ithe most use-

ful knots, hitches the writ: rigging splices, ete MARK, not be pats Over 100 illustra- anless you know the tions. All about cret. Invaluable for many wire rope attach- Keep your post- ns. als and other Private — orandums away fro rying eyes. Great fun for or playing Di jokes. Only 150 Gott! ET BIBLE T CURIOSITY Smallest =— in the world. Size of a postage stamp. 200 Pages. Said to ring good luck to the owner. uine work of art. Must be seen to be appreciated. Make good money selling them to friends, church acquaintances, ete.’ PRICE 15¢ each, 3 for 40c, 12 ———v for $1.35, 100 for $7.50. Also obtainable in Leather Binding, with gold edges. Price 50c each, 3 for $1.25, $4.50 per doz. Magnifving Glass for use with * a et Bibl le, 1S¢. ws Boy His Own Toy Make enero rane Greatest boys’ book written. Tells how to make a Pinhole Cam- era, a Canoe, model allroad, a Telephone, 30omerang, Telegraph Instrument, Box Kite, alking "Machine, Microscope, E leoteio Motor, Electric

Look just ‘tike ordinary Matches. Put 10¢' » in boxes just up like regi.ar Safety $4:

Door Bell, Water Wheel, Paddle| Matches. As the victim tries Raft, a pair of Skis, a Dog Sled,| to light ne he gets quite a Bird House, Rabbit Yard, ote. 64| Surprise. es, 150 a PRICE, Price 1‘*c per box, 3 boxes for

Postpaid; 3 for 25c, 25c¢ postpaid, 12 for 75 cents, MAGICIAN’S OUTFIT PRiysten and Directions for a Number ysterious Tricks Enough for an Entire Evening’s Entertainment Oe" ANYONE CAN DO ain On U 5¢ It is great fun mystify i ing your friends. this Conjurer’s Cabinet, an you will be the Cleverest fellow in your district. It contains the apparatus for seven firstrate tricks, in= cluding Lhe Disappearing Rose, that, when on the lapel of your coat, Aire es from sisht at will; the Magic Vase and Ball ‘Lrick placi 2 in

Pp neone else’s pocket); ‘ihe Masic NES vith ae h you Soe area eee ae ee most in two; the Wonderful Card ‘irick (a card is placed in an envelo and wh open an entirely dificrent card altogether is found); ‘lhe Disappearing Coin rhea coin is placed in the little wooden barrel, and, when opened aga.n, is found to have Tanihed entirely, or can mude to change into a ccin of another denomination); he Famous Tiseslving Penny ‘1 tices ‘Lhe Glass Goblet and Vanishing Coin Trick (a coin is dropped into a glass of water, Tae yal en ace ere is pour po se nits the tricks described abo d full printed instructions for perfor: ach trick, so that anyone can reedity peta all the tricks to the great amusement ae their friends or the public, ny boy of ordinary intelligence, with this ‘abinet of Tricks in his cessesion, can give a parlor entertainment not inferior to tome regular magicians. sides the tricke ecntained in the Cabinet, there are many — feats and illusions fully explained with full printed instructions, for which you fisily make or procure the necessary annaratus. This unexcelled Cabinet of Tricka

be all that you can seo w your fingers, t! terior opening A finish, mM Very, aasars r wearing. JUST. LIKE GARETTES. BUT SUCH REAL STARTLERS! The bor contains ten genuine cigarettes of excellent quality. loud entirely harm! novel. Fitte Maca es etre

than half. bacco. ickel-plated. is no fi

Kissing Per

for ONLY 75 CENTS POSTPAID TO ANY ADDRESS. A DeLure Kdition of our new 1925 CATALOG

10c, — doz. 10+ t similar illusions. been able to satisf ectoctl 3 for2Se, I dozen 75c. Johnson Smith & Co. size, weighs 34 02. ~r all done o! a and ea ay When played asan accompaniment yar or any other musical instrument is as 9 eurprising. can be des insti ed vill Ls Withabunch of these bills; itis easy for , 8 ropes time and peeling off a genuine bill or two from the outside of the roll, the effect creat: ‘| found to Prices, postpaid: 40 Bills 20c. ros for 50c. or $3.50 thousand postpaid. Wonderful X-Ray Tube erful — rument ducing opt cal illusions both sur ng ‘ion ina oe stem, ystery

ce, i prising and oe startling. pn. appare ie ead tneaesl the ine and many other hat no one has explain. Price noes VERY etriking and uncommon ring. Silver skull and crossbone design, with two brilliant, flashing gems tng Good out of the id by gros eo bets Goo a me the in anaes a will Gaee a ye NLY 25 CENTS. ORDINARY Exploding Cigarettes

cl They appear so real, but when each cigarette isabout one-third smoked, the victim gets a very great surprise as it gocs off with a ateat mirth provoker yet less. : Price 25¢

per box. Popular Watch Charms ... ONLY 8 for 40c; $1.35 doz, Very, pretty fittle curtosities and decidedly d w Magnifying Lenses Govt exes, Views © etc. rd’s Prayer in type, ¢! CIGARETTE MAKER GoARE

Te

Roll y own and save Makes them boner and quicker besides saving more your Neat useful and handy. Made entirely of stpa Price 25¢ po pee pix ayed with n

it whic MAKER Bose combined. oe rge the Sakice a avery surprising Ges deg: 5 fact, it scems almost incredible that a leat picture could be possib!e in such a small com- harp and diatinct they show up Come in asso ‘anama money. favorite brand of Pocket — MAGIC FLUTE Wonderfully Sweet Toned and Musical The Magic Flute, or Humane @ unique and novel hat is outh just playing h, - Bs ones ace d after a little prace charming as it is Novelty a. mit 10¢ ‘wo very novel metal plated, that you can wear, giving you fun out of all i psobo ras to their trifling cost. badge, 3 for 25c, or 75c¢ Garter Inspector 10e badges, nickel mailed f Rain Orly Broking "480 rages of ADDRESS ORDERS FOR ALL GOODS ON THIS PAGE TO Postage ties, vdras oe yi ny ovade pabeeaee Pome Scmaenee. Le] JOHNSON SMITH & CO. vert. 522, RACINE, WIS. BLANK seth omg PISTOL

the ttern i the latest — Poste paid , is enough to acareab lar, whilst, when loaded, it will probably prove just as effective as a revolver with real bul- lets, we eaous the nol oe ars to life. It kes the standa’ Calibre Blank C. es, that are obtainable most everywhere ven the most timid women can use it with perfect a and frighten a thief with- out risk to herself or anyone else. Bursilars, Tramps and id Metal. ostpaid. Elark Cartria es 22-ca}.. shinned press only, 50c ger 100. Johnson Smith & Con Dept. 522, Racine, Sneezing Powder | Place a very ema!lamount exe is, Mystic Skeleton A jointed figure’ of a skeleton 720 pd. in. in height, will dance to music and perform vari- ous gyrations and movements while je room =< carwillbegin Serpent’s Eggs Box contains 12 eggs. When lit with a match, each one srecoally hatches itself into to sne why. ‘Itis most amusing to 8, a8 they never suspect the real gource, but think they have caught it one fromm the other. Between the laughing and sneezing you poorsest will be bavinig the t'me of F mage ur life. For parties, politi- » car rides, or any place at all where there is a gathering of people, it is ae greatest joke out. Price10cor; 3 for about in a most life- like manner. Price per box 10c ppd. BOYS! BOYS! BOYS! THROW YOUR VOICE Into a trunk, under the 4 bedor anywhere, Lots of J, fun fooling the teacher, * policeman or friends. THE VENTRILO a little instrument, fits in the mouth out of sight, used with above for Bird Calls, etc. Any- one can use it. Never Fails. A 32-page book on ventriloquism, and the Ventrilo, ALL FOR 10¢c postpaid. ITCHING POWDER This is another good practical joke; the intense discomfiture of your victims to everyone but ‘themselves is thoroughly enjoyable. All that is necessary to start the ball rolling is to de- posit a little of the powder on a person's hand and the powder can be relied upon to do the et The result is a vigorous scratch, then ome more scratch, and still some more. 10c box, 3 Boxes for : 25c or 75Sc per doz boxes postpaid. Great Fire Eater | SQUIRT ROSE Most Sensational Trick ofthe Day! With the Fire Eater] - in his possession any| * person can become aj * perfect salamander, apparently bres athing fire and ejecting thousands of brilliant sparks from his mouth, to the horror and consternation of all beholders. Harmless fun for all times, seasons and places. If you w ish’ to pro- duce a decided sensation in your neighborhood don't fil to procure one. Wesend the Fire Eater with] ment to press the bu Geen biliske 1 all the materials, in a handsome} Don’t they jump? There is a very long box, the veg er of phen is highly Aome ae tube = at easily reaches to the ornamented wit ustrations in| pocket of your coat or trou epi adie Ben various colors. Pelee of all coml- Bulb is large enough to makes dozen J eze without Stee | mee reason ear eir re-

curls rand twists

A REA L STARTLER. This © most popular of all squirt tricks. flower in your coat looks so fresh eweet that everyone is tempted to ir ie the The d

the delizitful perfume. Then i shots with one loading each, or 3 for 6Se postpaid, Wonderful tment.

Instrue Greatest thing yet. Nine sep- arate articles in one. Everybody delighted with it. , curious and interesting. Lots of pleasure as well as very useful. It is a double Microscope for examining the wonders of nature. It is also an Opera Glass, a Stereoscope, a Burning Lens, a Reading Glass, a Tele- scope, a Compass, a Pocket Mirror, and a Laryngascope ¢|——lor examining eye, ear, nose and throat. It is worth all the cost to locate even one painful cinder in the eye. Folds flat and fits the pocket. Something great—you_n one. Don’t miss it. Sent by mail, pos a Price, only 35c¢ or 3 for $1.00 postpaid. ESE ROSE BUSHES The Wonder of the World ¥ Japanese Rose Bushes bloom all the year found. Just think of it. Six weeks after planting the seed, the plants che be in full bloom, It may not seem possible, but we posi- ~ tively guarantee it to be so. They will bloom every ten weeks, Summer or Winter, and when three years old the bush will be a mass of roses, bearing from five hundred to a thousand roses on each bush. The flowers are in three shades —white, pink, and crimson. The plants will do well both in and out doors. We guarantee at least three bushes to grow from each packet of seed. ic@, 10 packet, 3 pkts. for postpaid.

Cts.

© This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6.

Page 108

POPULAR SCIENCE MONTHLY May, 19% How Much Life Do They Show? There's one sure sign of life ata machine. That is its record of output ona Veeder Counter. There’s one sure sign that designer and operator are alive to their op- portunities. TJ hat’s a mounting pro- duction-record on the Counter. The push behind development work; the drive behind the opera- tor’s work:—these show in the “Veeder” record. Plenty of signs of life on the job, when it has to register on a RR COUNTER The small Revolution Counter be- low registers one for a revolution of a shaft, recording a machine operation, or product. Though small, this counter is very durable; its mechanism will stand a very high rate of speed, making it especially _suit- able for light, fast-running ma- chines and most adaptable to ex- perimental work. If run backward the counter sub- tracts. Price $2.00. (Cut 4 5 size.) Small Rotary Ratchet Counter, to register reciprocating movements of small ma- chines, also $2.00. The Revolution Set-Back Counter below records the output of the larger machines where a shaft-revolution indi- cates an operation. Sets back to zero from any figure by turning knob once around. Supplied with from four to ten figure-wheels, as re- quired. Price with four figure-wheels as illustrated, $10.00—subject to dis- count. Cut less than one-half size. Set- Back Rotary Ratchet Counter, to record reciprocating movements as on punch presses, $11.50 (list). The Veeder booklet shows in- struments that ‘‘count every - thing on earth.”’ See them, by sending for the booklet. The Veeder Mfg. Co. 44 Sargeant St. Hartford, Conn. | Detter Shop Methods: Mounting a Heavy Chuck on a Turret Lathe By Avsert A. Down EY, Tom!” yelled Frank to another workman just across the aisle. “Come over here and help me put this | chuck on, will you?” “Sure,” said Tom. “Ill be there.” He found Frank struggling with a heavy 15-in. chuck on the floor beside a turret lathe. The chuck and adapter weighed at least 250 pounds. The two men set it on the ways of the machine, but lifted, tugged and tried in vain to get it started on the threaded end of the spindle. If you right The chuck is lifted and clamped firmly on a boring bar which is mounted in the tur- ret; then it is threaded on the lathe spindle have ever tried it, you know how difficult a job it is. As they were hard at work on it, along came one of the ‘‘old-timers.’” He watched for a few moments and then said: “ Wait a minute, boys, and I'll show you an easier way to do that.” He picked up a 3-in. boring bar lying on a nearby bench, put it in one of the turret holes, and clamped it there. “Now, fellows.” he drawled, “just lift the chuck up and slide it onto the bar and tighten the jaws on the bar. Then all you've got to do is move the turret up toward “the spindle and pull the belt around by hand until you catch the thread in the adapter and get it w ell started. After that just twist it on the rest of the way and the job is done.” And the Old-Timer grinned and passed on down the aisle. Ladder Shoes Prevent Mishaps LIPPING ladders cause so many industrial accidents that every precaution should be taken in connection with their use. The simple safety de- vice illustrated is well worth the cost of installation. It consists of a pair ladder. hole for bolt or pin. useful on wet or oily floors.—H. L. W. of cast-iron shoes, one for each leg of the The only machining is drilling a Shoes are especially A canoe of outstanding beauty You’Ltt admire the “Old Town Canoe’ the first time you see it. The trim, graceful lines and the jaunty way it rests upon the water will win you at a glance. But, you must actually paddle an “Old Town” to fully appreciate the advantages of this canoe. ‘Old Town Canoes?’ are light in weight and remarkably easy to handle. They respond instantly to every dip of the blade. They are steady canoes too—perfectly balanced. “Old Town Canoes” are patterned after ac- tual Indian models. Of course, we have im- proved and strengthened the red man’s craft. but the original lines have been retained. “Old Town Canoes” are low in price too. $64 up. From dealer or factory. The 1926 catalog is beautifully illustrated. with all models in ‘full colors. It gives prices and complete information. Send for your free copy today. Otp Town Canoe Company, 1€95 Middle Street, Old Town, Maine. ‘Old Town Canoes pias EAR, aa *“B” POWER Storage “B” Battery © 24Veits Lasts Indefinitely—Pays for Itself Economy and performance unheard of before. Recharged at a negli- gible cost. Delivers unfailing power that is clear, pure an Approved ¢ ani wh oe ted as Standard by lead ye ading Radio Authorities, includ- ing P. aboratories, Pop. Inst. Sta: Se io News Lab. oy Inc., and other a cae ee Equip uipped with with Solid Rubber Case, an insurence See acid and lea! heavy class jars. Heavy rugged plate rder yours today! SEND NO MONEY Sst, state number of batteries and we will ship day — is received. Extra offer: 4 batteries in series (96 volts), $10 exp essman after examining Sans 5 per cent discount = with order. Mail RLD order n RLD BATTERY COMPANY 1219 So. Wabash Av Ave., Dept, 8 t, 80 Chicago, IIL Prices: 6-volt, 1 199 Amp. #1 re 25; en tg0,amp.& $13. Se Ber 1h Amp. Sh World STORAGE BATTERIES Set your Radio Dials ae a raeters for the new watt World Storage 2 cr Station, WSBC, Chicago. Watch for announcements. In Your Own Home You may now have any musical instrument for a week’s free trial in your own home. Ex- amine it, show_it to your friends, play it as much as you wish. No obligation to buy — ne expense for the trial. Easy Payments If you decide y buy, payments Bre arranged in convenient small monthly su A few cents a day will pay y for your ‘instrament. Bpecial offers on complete outfits. he exceptional tone quality of Wurlitzer fin- struments Is the result of 200 years’ experi- ence in musical instrument building. Used by leadi ng professional musicians, prominent bands and orchestras. Usually easy to play. SEND ror New Catalog Describes and iilustrates every known musical instrument—many shown in full colors. Special factory prices direct to you. All details of free trial easy payment plan. All sent free — no obligation. Write today ! Rudolph Wurlitzer Co., Depts’ 1785 © This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6. 320 w. 42nd St., New vivo omen 34 Bone Gatgave Cincinnati Golden Gate A ra ‘ancisco wal 9 S. Wabash Ave Copyright 1924, Rigchae if bei freee Co. whi! pan belc me

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POPULAR SCIENCE MONTHLY Metter Shop Methods | Expanding Arbor Holds Side Cutting Mills for Fluting By O. S. MarsHaty O PERMIT a clean sweep across the face of blank side cutting mills while fluting them on the sides, the ex- panding mandrel shown in the drawing below was designed. Its operation is How the blank side cutting mill is held on the expanding arbor for the fluting process made clear in the photographic illustra- tion above. The taper shank of the arbor is made to fit the dividing-head spindle, in this case a Brown and Sharpe No. 10 taper. There are four parts to the complete arbor; the main arbor, an inner split bushing, an expanding screw for the latter, and the retaining nut, which holds the expanding bushing within the main arbor. The expanding bushing has a taper at its forward end, which is to fill the mating taper within the main arbor, thus center- ing the blank when the closing-in nut has forced the bushing in contact with the main arbor. The blank is finally tapped against the closing-in nut, against which it rests while being fluted. The blank preferably is fluted on its periphery first, and, in case of large-sized 3" 106 Y6'PIN ENGAGES KEYWAY al 14 ~“12-USF AND PREVENTS EXPANDER ° 3. r— APE 56USS| Nl oe ANN ‘w nS Hi AY AN l ile NN aa {on Sa UNAS PS = NU ed NAT ANNANANN Z 1 et tu NO-I0 B&S.TAPER KIER VA 7 LENGTH OF SCREW a “G . Pcl CH LENGTH OF BUSHING Details of the expanding mandrel, which can be made in several sizes as the work requires FROM TURNING blanks, a steadying pin may be used, located in the face of the retaining nut at a convenient position to enter one of the spaces. This insures against any possible slipping of the blank. Only two or three sizes of such man- drels need be made, since split rings may be set on the nose of the taper bushing to accommodate holes of varying sizes. Light and Power : for Twenty Years | At = No poustT you remem- | ber the first automobile you ever saw. Perhaps you'll remember, too, that it bore a shiny little tank marked “Prest-O-Lite” . . . for Prest-O-Lite gave the motor-car its first dependable eyes. This same company, which has served the | automotiveindustry so | successfully for more than twenty years, to- day serves radio witha dependable, long-lived battery, of special de- sign, that brings out the best in any set. You can rest assured that Prest-O-Lite Bat- teries are correctly rat- ed and deliver full power at all times. They are attractive- ly priced from $4.75 up. \A Tue Prest-O-Lite Co., Inc. INDIANAPOLIS, IND. New York San Francisco In Canada: Prest-O-Lite Company of Canada, Ltd., Toronto, Ontario Send for this free booklet “What every owner of a radio should know about storage batteries. Designed especially for radio © Srest-O Lite STORAGE BATTERIES FOR MOTOR-CARS AND RADIO “LIGHTING FIXTURES” Ready to hang. Direct from the manufacturer. Completely wired, including glassware. Send for New Catalogue No. 27 (Just reduced prices) Special proposition to Dealers ERIE FIXTURE SUPPLY CO. Desk A, Erie, Pa. Owna CORONA, ; —— The portable typewriter built like an office ma- chine. Has four-row key- board and big- machine features throughout, Write to Corona Typewriter Co ,Inc., 112 Main Street, Groton, New York Putty Useful in Babbitting UTTY is superior to clay for closing the ends of bearings that are to be bab- bitted. With clay there is always some risk arising from the moisture, which may cause an explosion and sometimes serious injury. This danger is eliminated by the use of putty. Bodies of Rare Beauty for Fords at Factory Prices This Model in Grey Prime. $39.50 Sport Body Works, Aurora, Illinois © This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6. Write for circular 2 A-10 showing this De Luxe Model and others. $22.75: EA

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For Economy MAICO AMATCO HOME-CAMP. No center pole. Maximum head room. Four steel corner poles collapsible to 2% feet. Always rig'd, erect, convenient and roomy. OLIVE SHOWER-PR OF fabric. AMATCO BACTISH. A modernized wall tent. Ideal for the tourist camper. Gen- erous base size. Big cot room. The sensible tent at a sensible price. AMATCO BOSTON AUTO TOURING TENT. The De Luxe Auto Touring Tent. Convenient. Comfortable. Two roll-up doors. Two bobbinet windows for ventilation. For further detai's on “ these and other tents write for com- bination cata'og—instruction book, 1 HINTS FOR TOURISTS AND CAMPERS. AMATCO TENTS represent true econ- omy. Their sturdy construction and quality materials insure long life. At 4 your dealer’s or sent direct to you, r carrying charges prepaid. { : AMERICAN TENT & AWNING CO. Manufacturers 100 Cummington St., Boston, Mass. : D I~ 4 LET US SEND THIS VALUABLE BOOKLET **Hints for Tourists and Campers” by The Old Timer --combined with complete in- formation on AMATCO TENTS and accessories. Every pros- pective auto tourist or camper should have this little boc}:'ct. Sent Absolutely Free. 1...1L THIS COUPON TODAY. Please send me above booklet 1 by return mail. Ee | POPULAR SCIENCE MONTHLY rertier Shop Mietinods | Revolving Stand Keeps Tools Together in School Shop OR keeping tools with the machine to which they belong, the fixture illus- trated below has proved useful and eco- nomical in the machine shop of the Kern County (Calif.) Union High School. One of these fixtures was built for each of the lathes and other machines in the shop. It consists of a gaspipe screwed into a cast-iron base. A revolving wheel is fastened to the top of the pipe, and to it The small tools needed for each machine are chained to the stand near it are attached steel chains, which carry the various small tools needed for each ma- chine. The chains are welded to the tools so that they cannot become separated. These fixtures, all of which were made in the high school foundry and machine shop, have more than paid for them- selves by saving time and eliminating the loss of tools.—G. W. Garrarp. Electrical Way of Measuring the Velocity of Water SIMPLE and yet very exact method of measuring the velocity of the flow of water in pipes makes use of a well- known electrical principle. At the point where the water from the reservoir flows into the pipe, which may have a diameter of from 12 to 16 in., a bag containing about 1 |b. of salt is introduced. The rushing water destroys the bag quickly as it is carried along, and the salt dis- solves. At a distance of 500 or 1000 feet from the intake, two electrodes, one of copper, the other of zinc, have been introduced previously into the pipe; they are in- sulated from the pipe, but in contact with the flowing water. The electrodes form a galvanic element with a tension of 0.2 volt, as shown by a voltmeter. When the water holding the salt in solution reaches the electrodes, the indicator of the volt- meter immediately registers a tension of 0.5 volt. The difference in time between the moment when the salt was introduced in the pipe and the moment when the hand of the voltmeter jumped to 0.5, represents the time taken by the flow of water for the measured or test distance.— Ernest WELLECK. May, 192 The sensation of the VBOA TS ir. Offerin new advanced features in Power, Speed, Control, Weight and Perform: ance. For example— NEW— Super-Power Twin Motor- At normal speed develops 3.85 H. P. [Brake > Test]. In racing trim develops 4.65 H. P NEW— Under-water Stream-Line Design ‘ —Cuts the water like a knife a ae ey once | —Gives flashing s ee Propeller” — Protec oat, Boaters and NEW — Super-cherged hata Pomp eed ——Insures a cool motor always at al! : EW — Combination Fro “yer and dewey poiemtnnneete —Steers i i DER ee — Costes! Seater . —One easy a ustment for all speeds an weather: NEW— Top-Span” asy Starter with big Kinoman Moe aol —Gets you away in a flash NEW—Comiination : cing aoe, Vesting Control —One throttle lever for peed EW — Lees Sperentes en J — Against all defects in material i NEW—Five Days’ Trial Offer raphe mened ——Gives you a chance to match with any other Motor WRITE FOR FREE CATALOG FOLDER TODAY Ny JOCKWOOD-ASH “617 Jackson St. Jackson, Mich. # X You can play this easy fingering Buescher Saxophone. Most wonderful music. 3 lessons given on request with each new BuescherTrue-Tone. Teach yourself. Many play scales right off- easy tunes first week. You can. Easy to Play, Easyto Pay a Try any Buescher Instrument for 6 days. Satisfaction or no sale. Easy terms arranged. Send postal for cat- alog and details of trialand payment plans. Mention instrument preferred. No obligation. Send today. BUESCHER BAND INSTRUMENT CoO. 1515 Buescher Block Elkhart, Indiana ROSS GORMAN Saxophone Wizard Earl Carroll Vanities Orchestra Magnified 225 Diameters This is what the tip of a fly’s leg.is like when seen through the ULTRALENS MICROSCOPE sa At last a high powered microscope is within the means of all who wish to , observe 'and experiment with st world of minute objects in- Such fun it a8 ble to the naked eye. quired, yet hundreds of scientists and teachers are using this ment, Gives enormous magni fica- tion and per- fect defini- tion Send $7.50 for co ete SCIENTIFIC APPARATUS CORP. $7.50 for a Dept. 207 Milton, Pa. IS] This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6.

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petier Shop Methods How to Make a Floating Holder for Reamers By H. L. WHEELER LOATING reamer holders of many designs are made for use on turret lathe work. For the most part they are only semi-floating because they are rigid in one direction. Consequently the bene- fit of the floating effect is not available. The design illustrated has a full floating joint, which overcomes many of the de- fects found in the semi- floating type. It prevents the reamer from binding i in any direction and insures perfect alinement even in long holes. The holder is made in three sections of machine steel, carbonized, hardened and ground. The first section (1) is solid, The parts of the holder and how they are assembled to insure alinement in reaming with a taper shank to fit the machine, or it may be made with a straight shank to fit a chuck. A floating plate (2) between the shank and the nose has a central hole about 4% in. larger than the body of the holding screw. It is provided with keys on one side and recess on the other to fit corresponding seats in the shank and nose (3). There should be about .010 in. side play between projections and slots. The nose is held in place by a screw (4) passing through a central hole and into a tapped hole in the shank. The screw must be tight against its shoulder, leaving enough room under the head to prevent the whole assembly from binding. There should be about .010 in. clearance on each side of the plate when the screw is up tight. A taper pin is used to drive the reamer. This passes through a hole drilled in the reamer shank and is tight in the nose of the holder. The hole in the reamer shank should be large enough to give plenty of freedom, but not large enough to weaken the shank unnecessarily at this point. Making Grinding Wheels Last HE rate of wear on grinding wheels is increased as the diameter of the wheel is reduced by frequent truing with adiamond. When a wheel is running con- tinuously on production work, very light cuts with a diamond about every twenty minutes will keep the wheel sharp and conserve the working life of the wheel. Vip ikl a dl y ne POPULAR SCIENCE MONTHLY your tubes— 4 good radio can be obtained Give your radio set a spring-tonic by in- vigorating the tubes the Sterling way, you will find that the quality of your recep- tion is practically winter—always enjoyable for porch danc- | ing, baseball scores, concerts, | entertainment to more enjoyable. | | { | | | with the Sterling Tube Reactivator. meter on this device shows you when tubes ed reactivation and proves their increased efficiency after treatment. strument, easy to operate, and no guess- work in its results. For your complete radio home servicing equip- ment also use Battery Chargers oon Sterling Pocket Aerti 107 Don't neglect all summer long! and as good as you got in and musical make warm evenings KEEP YOUR TUBES FULL OF VIGOR The A high class in- Price $12.50 (50-60 cycle) $14.00 (25-40 cycle) Sterling Tube Testers, Meters. Ask your dealer ! The Sterling Mfg. Company Cleveland, Ohio, Dept. V arling, EACTIVATOR, | | | | | | | Sterling | | | | Build and Fly It q Yourself ae Blue Prints and Material now read =} for Builders! Send 25c for illus- trated book. IT TELLS YOU HOW wale 0 STANDARD AIRCRAFT CO De H. Lincoin, Nebraska New Flying School Opens June Ist. our Way Through Eara Just think! Through our amazing new plan you can get this $2409 bungalow for only $1606—a clear cut sav- ing to you of $803 or actually one third! We furnish you with the finest materials cut to fit direct from our mill— saving you big money on your lumber, mill-work and labor. Satisfaction guaranteed or your money back. Buy Direct From Mill Save 4 Profits You positively save four big profits by buying direct | from our mill. We give you every thing complet e— all lumber cut-to-fit. windows, doors, flooring. shingles. lath, glass, paints, varnish, putty. hardware, nails, “molding. cupboards— all plainly marked and easily assembled ac- cording to drawings and directions we furnish. We pay the freight. Write now for our beautiful book of homes which shows you a large number of lovely homes. Priced from $478 up. Send for it at once—no obligation. INTERNATIONAL MILL & LUMBER CO., E-1 South Wenona Ave., © This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6 } | OnThisHtome' Bay City, Michigan | FREE Catalog of 17, popwar styles including new “Joy-Boy”’ square-stern sponson outboard motor canoe, boats, equipment. Staunch, dependable. Popular prices. Write KENNEBEC BOAT & CANOE CO DEPT. G-12, WATERVILLE, MAINE °* your muscles limber / ORK the stiffness out of lame, sore mus. cles with applications of Absorbine, Jr. The magic bottle quickly takes the ache away from tired muscles — makes them feel new again. Absorbine, Jr. wakes up the circulation. It combats congestion. Before you know it you are fit again for work or play. Absorbine, Jr. is equally effective for tired feet — blisters — callouses—cuts and bruises. At all druggists’, $1.25, or postpaid Send for free trial bottle W. F. YOUNG, Inc., Springfield, Mass. Absorbine J THE ANTISEPTIC LINIMENT 4

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108 It's Easy toBuild a Powerful Set Using the New and Improved FRESHMAN TRF Low Loss Kit Straight Line Wave Length Condensers With Low Loss Self Balanced Coils - -: - These are the iden- tical units which have made the O FRESHMAN —_—— MASTERPIECE factory built Receivers thé“World’s Greatest Radio Sets.” Complete instructions for building this powerful five tube receiver, written in plain everyday English, together with actual size schematic wiring diagram, are furnished with every FRESHMAN “TRF” Kit Sold by Authorized © ye a Reciteay? CHAS. FRESHMAN C0O., Inc. Freshman Building, New York 2626 W. Washington Bivd., Chicago © No guessing, less wiring and—no grief—with AMPERITE. Eliminates hand rheostats. AMPERITE is the only perfect filament control. “pecifiedin all popular construction sets. Price $1.10. Aeadiall Company Dept. P.S.-1 50 Franklin Street, New York City 4 2 Write for RES US PAT OFF The “SELF-ADJUSTING” Rhcostat POPULAR SCIENCE MONTHLY Ldetter Shop Methods Old Bill Repairs a Machine (Continued from page 76) these circumstances. If we were to weld the break, we would have to dismantle the machine, and it would be a week before you could have it running again.” “We surely don’t want that,” the president exclaimed. “And if we were to bolt a patch on,” Old Bill continued, ‘there would always be the possibility that the screws would come loose, and that would mean that the machine would not be accurate. As for strength, most of that iron is to make the machine rigid; about a tenth of it would do for strength alone, so we are amply strong in our repair.” He turned to Bob Laten. “Just as soon as you have one of the slots chipped out so that you can measure it, phone the length of the key to me, and I will have it planed and sent out at once. Do not chip corners of the slots square but | leave them round, as the drill made them.” T THE shop Old Bill made a little computation. He would heat the key about a thousand degrees, and steel would expand six millionths of an inch for each degree; his key was to be six inches long between the heads—that would be an ex- pansion of thirty-six thousandths. Then, he thought, Laten could not get the seats for the head perfectly flat, and the casting would not fit together as tightly as it ought, so he decided he would plane the heads \% in. closer together than the measurement which Laten presently gave him over the phone. r The red-hot key would have to be driven in place, whereupon the shrinking would pull the partstogether; and the key would still be under a considerable load when it was cool, insuring its tightness. It was just after lunch when the first key went out, and the other four followed promptly, so that not much later than the usual quitting time, the keys had all been shrunk in place, and the mill opera- tives were reassembling the machine. It was not until the next morning that the president of the firm came out. He had the machine stopped to look at the repair. “*T can’t feel the crack, and can barely see it.” he said smilingly, pleased with himself at the stroke of fortune that had led him to send for Old Bill. Curving Light Sheet Metal N THE absence of forming rolls, a mechanic en- gaged in experi- mental work used a unique method for curving sheet metal. A pulley of somewhat smaller diameter than the shell desired was selected, and the sheet (A) fed in between the pulley and the belt while the latter was pulled by hand.—S. W. Brown. Pulley and belt can be used as forming rolls | 250 Fourth Avenue IS} This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6. May, 19% Here’s why thousands use Soldering Kester Metal Mender. Booklet Simple—* Requires Only ica: eat’ Anyone can useit- C1 bat o afe—No mess ts or iad — Solder” Sure — Genuine Solder Upon makes firm mctal joints. Request Satisfactory — W orks equally well on light or heavy, old or new work. Economical—Saves many times its price. Your Dealer Can Supply You CHICAGO SOLDER COMPANY 4201-318 Wrightwood Ave.,Chicago, U.S.A. a In the best kits ) . CARTER Radio Parts are specified by the Manufacturers Bremer Tully Hammev-lund Roberts Si:ver-Marshall Samson and others Your dealer can show you why In Canada—Carter Radio Co., Limited, Toronto “Experiments With 110-Volt Alternating Current’”’ HERE at last is a book that gives a practical working knowledge of the alternating current The only way to gain a thorough understanding of electricity is by direct personal experiment. How a practical knowledge of the alternating current can be gained in an interesting and inexpensive way is shown. The knowledge that comes from experiment is of vastly more value than that acquired from the performance of the stereotyped series of battery experiments usually described in books on Alter- nating Current. The book ‘Experiments with 110-Volt Alternat- ing Current” is needed by every man experimenting with alternating current. 256 pages, 135 illustrations. Price, postpaid, $1.75 POPULAR SCIENCE MONTHLY New York City AND MINTS to T 6 I will put you in business as my Direct Facto Agent and Jobber, to take orders for my ful! line of candies, chocolate bars, mints and chew- ing gum. Unlimited opportunities for hustlers. No experience needed. furnish everything. Every stvre and everybody buys. Work spare time or full time. Write today for catalog. selling plan, Free Samples and Free Ford Offer. Ex- clusive territory. ACT QUICK. MILTON GORDON, 1416 Vine St., Cin’ti, 0. Dept. 1060 >F~\ BRAND NEW CATALOG No. 26 9 Bigger than ever: 40 s kinds and sizes of Small Steam, Gas & Gasoline En- gines, % H.P. up. Smal Boilers, Pumps, Toy Engines, Model Air-Plane Motors, 4 H. P. Marine Engines, Mode! Locomotive Drive Wheels & Blue Prints. Small Lathes, Drill Presses. Gears, Pul- leys, Belting & Moiel Makers’ Supplies. Engine Cast- ings & Blue Prints. Sent anywhere 25c Stamps or silver (Preferred) e & Supply Co., Inc. ‘Reor- t., Chicago, ill., U. S. A. Refunded first order. Modern En: ganized) 514 C West Van Buren A ‘ ian i. tiie

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May, 1926 140-page Book full of life- size ruled forms, each one completely filled in. The an- swer to problems of account- ing and record keeping for any business or profession. Send for this FREE Book today John C. Moore Corporation (Established 1839) 3080 Stone St., Rochester, N. Y. Makes people and objects miles away sem close. Brings new pleasures to 4 hume, farm, camp, travel, s = See moon and stars as never befo New_ Ferry “‘Wonder’’ aaa has 5 sections — over 3 “3 long open, 12 in. closed. Fully brass hound. Powerful lenses. GIVEN! With Every Telescope! Handsome leatherette cov- , ered Carrying Case, light. strong, complete with strap. Handy for a Buto pouriats and hikers. 5 Sections 8-Power Lenses Thousands Delighted ! ba | am delighted \ with the ‘Wonder’ tel- escope. Today I have been watching subma- S rines 3miles off the coast.’’ y. —Philip Brush. ‘‘I can see across the eo ag a 3 miles } and see people fi 3 ning. 7? —M. L.Thorn. “‘I am nearly 80 years old andif I = og not get another would not for it.”’-— ker. oy can tell time on the church clock 5 miles away.’ » Edward Foster. “Could t teh color of aeroplane 4 miles awa Yarbrough. “‘Isawa i ht House 18 miles away.’’—Clyde Scribner, { Send nameand address and Ferry Wonder3- {t. Telescope with Carrying Case given will come by return mail. Pay postman special : bargain price of $1.85 plus few cents post- age. atisfaction fenton ord or your money back. Supply limited, order today ! Ferry &Co.,Dept. 1785, Chicago ZIP- ZIP Here is a letter we received from a lady from a out west Gentlem My boys — rm delighted with the Zip- Zips shooters that they ordered from you that | am enclosing check for o dozen more, | want each of their sees to have one "also. soon as possible. Please send these a Thousands of boys are made ha with this wonderful Zip -Zip shoot- rom us or your dealer.Send stamps, coin or money order, PEWR s—Under- IP wood, od, Kemineton, hye om 2 and it’s yours / yy: All late models, comm hetaly | repuilt and re- Tased be brand new. GUAR FED fergen ate +g y free trial offer ime, international Typewriter Ex., 186 W. Lake St. Dept. 538 Soleus POPULAR SCIENCE MONTHLY _work stroke. Betier Shop Methods | | q; Pointers on How to Replace Piston Rings Properly IX FITTING piston rings, several things should be taken into con- sideration—the trueness of the cylinder, the fit of the piston, and also the condition of the piston ring grooves. Assuming that the cylinder is fairly true, that the piston fits reasonably well, and that the piston ring grooves are found to be square, then only an allowance for heat expansion need be considered. Great pains should be used in fitting the rings to the grooves. The ring grooves should be cleaned thoroughly before at- tempting to fit new rings. The rings should be fitted without oil to the groove; and, before they are placed in the cylinder, oil should be forced behind the rings to make certain that they will not stick when put in service. I find in practice that the staggered one- piece concentric ring is quite satisfactory when properly fitted. I also find that the greatest leak usually is behind the ring and not between the wall and the ring face. The top ring, which suffers the greatest heat expansion and wear, should have less clearance at the opening or split than the second and third rings, although this seemingly should be the reverse. The ring just above the wrist pin should be placed with the split on the side of the piston that tends to receive the angular thrust of the connecting rod during the A good way is to place this ring with the splits ct an angle of 90 deg. to the wrist pin ends. The splits of the other two rings should be placed 180 deg. apart and about 20 deg. either side of the wrist pin ends. What I have written here applies only to a motor needing rings fitted.—B. A. DuNn.ap. Center Square for Small Work OR marking the centers of lathe work and for use in various awkward posi- tions, a center square can be made quite easily as shown. The square is particularly handy for use in marking rings, as it can be applied either inside or outside of 08 A piece of sheet steel and two pins 3¢ in. in diameter and % in. long are needed. 2 STEEL PINS %' DIA.x Yig LONG .) ‘ SHEET STEEL leo J. Ye THICK aa. = A simple type of square for making centers, bisecting rings, and various awkward jobs The dimensions of the square may be varied, although those indicated on the drawing have proved satisfactory for ordinary work. The main precaution required is that the ruling edge of the square should be precisely at right angles to a line connect- ing the centers of the pins and exactly half- way between them.—L. M. © This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6. 109 Burgess Batteries ~ iY ate the receiving sets of radio~ Les 309° Zaye) Ze equipped mail planes > SS = An every-night adventure of Burgess Radio Batteries Ce of the reasons why you should always buy Burgess Radio Batteries is that the batteries used by air- mail pilots —battleships —ex- plorers—and the majority of recognized radio engineers — are evolved in the Burgess Laboratories and manufac- tured in the Burgess factory. These batteries are identi- cal with the batteries sold by your dealer and thousands of other good dealers every- where. Burcess BATTERY COMPANY GENERAL SALES Office: CHICAGO Canadian Factories and Offices: Niagara Falls and Winnipeg nes ea x Me zl) a : il cy leateeny 4 Cay Ga mM . Sere BATTER! ES POOKIE ORS

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Play Real Music in 10 Minutes on the HOHNER HARMONICA EE how easy it is! Take your instruction book — you can obtain one for the asking—read || the simple direc- “tions and look at the pictures. Then take your Harmonica, hold it as shown, place it to the mouth and blow—draw, blow — draw. In ten minutes you will have mastered the scale — and “when you can play the scale you can play all”. If you want to enjoy the satisfaction and popu- larity that comes to those who play the har- monica, get a Hohner today—50c up at all dealers — and ask for the Free Instruction Book. If your deale- is out of copies write cena Sats Dept. 182, 114 East 16th St., N. Y. The handle, ferrule, and labor in a cheap brush cost as much as ina good brush. The big difference is in the bristles, The life of a brush is in the quality of its bris- tles and the way they are fastened. Buy a good one! WHITING-ADAMS BRUSHES Send for Illustrated Literature & JOHN L. WHITING-J. J. ADAMS CO. BOSTON, U.S. A. Brush Manufacturers for Over 116 Years and the Largest in the World BURN YOUR NAME ON TOOLS ARKOGRAF (/ Tools FromTheft. write with elec- 6% tricity any name or design on the hard- est and finest tools and instruments,or any metal, like writing a Eee with en or pencil. Comp’ Outfit 50 Pre he —w ‘interest~ ing “illustrated ae r tree. to- ents wanted. ARKOGRAF PEN CO — 1171-A East Stark St., Portland, Oregon POPULAR SCIENCE MONTHLY May, 1926 Duplex Mill Does 15-Minute Turning Job in 3 Minutes By Aupert M. Tuomas N THE repair shops where I work as tool maker, we have to machine the pivot pins on hundreds of brackets used on the gates of elevated railway cars. They have to be turned to a 34-in. diam- eter at the top and 1 in. at the bottom. The peculiar shape of these brackets made the job a tedious one in the lathe. The best one could do was four an hour. Next we tried doing them with a hollow mill in the drill press and though time was saved in the output, we found that it was a hard job to get both sizes to come central with each other. After a little thought, I developed the _ duplex mill illustrated. The holder A has The parts of the duplex mil! and how they are assembled for turning awkward brackets | a No. 4 Morse taper shank to fit the drill- ing machine spindle. The end is bored a | perfect fit for the cutter C and has an in- _ serted key corresponding to the upper end of the keyway in C, and also a set- screw to hold it in place. The nut B is fitted on the threaded part of C and has an adjustment of )% in. to compensate for grinding. The cutter D that forms the 1-in. size is counterbored a perfect fit for the lower end of C. It also is provided with an in- serted key and a setscrew, while in the body four openings are milled to accom- | The cutters modate the cuttings from C. are made of good carbon steel, tempered and ground to size. The brackets are held in the drill press vise. By using this tool, which cuts both sizes at once, a bracket can be done easily ' in three minutes. Thousands have already been made. Calculating Drill Speeds N FIGURING the cutting speed of a twist drill, the circumference of the drill is measured or calculated on the largest or outside diameter and then is multiplied | by the number of revolutions a minute. Twist drills are made in approximately 570 different sizes, ranging from .004 to 3% in. Drills smaller than % in. in diameter are not regularly made of high speed steel. ~ You will never know how good your radio is until your loudspe MUSICONE Write Dept. 17 for Booklet West of the Rockies, add 10 per cent to all prices THE CROSLEY RADIO CORP. e Cincinnati, Ohio ITUBE STUBE Crosley Radios §975%375, | Stop Using a Truss ars PARTS PLAPAQ > PADS roaay’s fl rom the truss, Soing medicine aggre made self-adhesive vosely to hold the distended suscles securely in place. = straps, buckles or spring ttached— cannot slip, so pene chafe orpress against the pubic bone. Thousands have succesfully treated themselves at home without hindrance from work—most — ¢ranq Priz, obstinate cases conquered. perry to apply—Inexpensive. Awarded Fah) ‘Medal and Grand P; Process of recovery js natural, so afterwards no further use for trusses. prove it by sending Trial of P‘apao absolutely FREE Write name on Coupon and send TODAY. Plapao Co., 790 Stuart Bidg., St. Louis, Mo. Name....... eeeccccceoes: a 1 Fat-Sinile pees seccsecee Pececcccscesecessces Protect yourself rom ate ty and hold-up men. Most ama::- ing automatic 44% in. long; gun-metal tinish. Can’t tell from real atuomatic until you pull the = Fock ' and presto! you have a= et Mirror, Magnifying ass, icocopen . Rez 4i ing Gi ir- Sons Did). Com- pas etc. ads of ‘uny useful, yo A real’ protecto 1.48 — Sew nni ARTICLES $i: a4 deny Tae ny limited. Ord Big Catal t FREE. sak & CO., Dept. 9775, aie Ne sorgain, Ce St.r Chicago, lil. ., On arrival , Automatic’’ or with Postman TOOL CHEST right Case in our FREE CATALOG H. GERSTNER & SONS 529 Columbia St., Dayton, 0. FOR PARTICULAR MEN Toolmakers and Ma- chinists will find the Send for it TO-DAY. ® This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6. A 2c Stamp —will start you on the road to success. See Money Making Op- portunities on pages 116 to 142. May, | dril rad son like hac or litt tap sm tha it.

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May, 1926 Better Shop Mictinods | Adapter for Tapping Small Holes on a Large Drill SHOP building large oil engines found that it could do all of the drilling on an engine frame under a large radial drill, with the exception of tapping some small holes for cover plates and the like. For these holes the heavy casting had to be moved to a smaller machine or the holes tapped by hand, until the little device shown was made. This is a tap holder arranged so that the tap floats vertically. The entry of the small tap into the metal does not mean that the heavy spindle must come with As will be seen, the slot and pin pro- x PIN“, _ PRESSED FIT AND SOLOER a--’ - 7 - 24 THOS" f PIPES y THREAD FOR % PIPE CAP 3 |: Me DRILL: ie = ORILLFOR TAP: 4 _— 24"—+ 2 Lay i 7 Details of the tap holder, which is designed to allow the tap to float freely up and down vide a means for revolving the tap, while it is not restricted in its motion up and down. In use, the revolving tap is brought over the hole and started in by hand pressure on the tap holder. The tap can be run in the required depth and the machine re- versed to bring it out with no danger of breaking the tap. The 3¢-in. pipe is held in the drill chuck and has a cap on the end to retain the parts. The slot must be large enough ‘so that the pin and rod slide freely. The tap can be fixed in the rod by any desired means, although that shown has proved quite satisfactory.—J AMES GARDNER. Holder for Tempering Pins EVERAL dowels, pins, or small punches may be hard- ened and tempered at the same time if a holder made as illus- trated is used. It is \-in. sheet steel bent double and filed at the folded end so that a slot is formed for the pins to enter, The pins are gripped at their upper ends by Squeezing the upper end of the holder as shown.—H. Moore. Using holder to clip five pins at once To FrxisH holes in aluminum castings larger than 2 in. in diameter, a-bar fitted with cutters will generally produce a better hole than ordinary reamers. Reamers of large diameter when cutting aluminum have a tendency to clog up quickly and leave a rough hole or a poor finish. POPULAR SCIENCE MONTHLY V/, HP. 60 CYCLE 110 VOLT or money refunded less return charges. for transforming AC to DC. prices. MOTOR BARGAINS SGaesmlar. % inch thick. Emery wheel will sharpen tools quickly without burning. Shaft threaded to take a standard Jacobs Chuck for drilling purposes. Write for descriptive circulars and attractive price list on our complete line of Constant and Variable speed, single and three-phase Motors. Squirrel Cage and Slip Ring types with many exclusive features, We have a line of rebuilt motors of all makes and sizes at bargain Quantity discount on both new and rebuilt motors on request. Northwestern Electric Co. Dept. 5, 420 S. Hoyne Ave., Chicago 111 This Convenient and Compact | BUFFER AND GRINDER Complete as Illustrated ONLY $222 Motor has extra size bunting bronze bearings with grease cups and filling cap. A 10 ft. cord with plug to fit any lamp socket included. Emery wheel and buffer are 6 inches in CASH WITH == ORDER Guaranteed to give perfect satisfaction All sizes. also Martin Rotary Converters cAll Wave Receiver” ae: SILVER COCKADAY Single Control —4-Tube Receiver Designed by Silver, Cockaday and the engineering staffs of the seven manufacturers listed below. .. . Sponsored by Popular Radio Magazine. .. . Endorsed and described by Radio News, Radio Magazine, Radio Engineering, Christian Science Monitor and Newspapers throughout the country. . The new S-C Receiver is presented to the Set- Builder with an astounding introduction that is his best assurance of a performance that willlive up to promise. ... An in- troduction that compels attention and appreciation . that speaks volumes of praise... that has been accorded only to the S-C Receiver. New S-C Features Perfected Single Control—Unlimited Wavelength Range—Extraordinary Volume that equals that of many 6-tube receivers—Quality unsurpassed—Hair- line Selectivity that brought KFI through a blanket of powerful locals into New York City with ample loudspeaker volume. The S-C is adapted to any standard cabinets, tubes, batteries or eliminators, and to practically all installation conditions. Assembled Easily S-C assembled is a marvel of simplicity. A special, multi-color wiring harness eliminates soldering, unless desired, and prevents error. With only a screwdriver and a pair of pliers, even an absolute novice can assemble the S-C perfectly in a few hours. That parts made by the following reputable concerns are recommended = the S-C by the designers is proof its true worth: Belden Mfg. Co.—S-C Wiring Harness. Central Radio Laboratories— Centralab Resistance. Polymet Mfg. Corporation—Fixed Condensers, Leak and Leak Clips. Poster & Co.—Drilled and ced Front Panel and Drilled Sub-Panel. Silver-Marshall, Inc.—Variable Condensers, Coil Sock- ets, Coils, Tube Sockets, Vernier Dial, ounting Brackets. Thordarson Elec. Mfg. Co.—R200 Power Trans- formers. Yaxley Mfg. Co.—Rheostat, Jacks, Switch. Get the hand-book at your radio dealer's, or clip the coupon and send with 25 cents to S-C MERCHANDISING COMPANY 64-66 E. Jackson Blvd., Chicago. S-C MERCHANDISING COMPANY 1S) 64-66 E. Jackson Blvd., Chicago. Herewith please find 25 cents for which send me the hand-book of the new S-C Four-Tube Receiver. MRM RA yoo rae one rec ofan areata ile Sl aaae ew eleancteis © This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6. Rut | Sica Patchin Plaster that fills cracks and holes easily and permanently NYONE can use Rutland Patching Plaster and make a perfect patch. Comes in handy cartons, all ready to use. Just add water. Unlike plaster of paris, this remarkable ng A few of its many other uses plaster does not dry Mending outside or ‘set”’ instantly. stucco or cement That’s why it’s so easy walls. to use. The patch will Pointing brick not shrink, crack, work. crumble or fall out. Closing mouse or You can paint or rat holes. paper over it without Sealing small shellacing and the cracks where in- patch will not ‘‘spot’’ sects or vermin through. enter. Paint, wall-paper As a mortar to hold loose tiles in bathroom walls or and hardware stores sell Rutland Patching Plaster. If your dealer hasn’t it, mail cou- pon. Ww e will send you a 22 lb. carton and you can pay the post- man 30c plus postage upon delivery. Rut- land Fire Clay Co. Dept. R-3, Rutland, Vermont. Patching Plaster ee es es ee ee ee ee ee ee ee ee ee ee ee ee RUTLAND FIRE CLAY CO. i] Dept. R-3, Rutland, Vermont { | ] Send me 2% lb. carton of Rutland Plaster. | |W nay dealer's mame. ...-.--- ---ccetecensertes -

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Big Salaries Paid Automobile Experts Fastest growing industry in U. S. A. offers unusual opportunities to trained men HE automobile industry is one of the biggest and fastest growing industries in the United States. There are more than 18,000,000 cars registered in this country and the number is increasing every day. The best way to prepare for success in the auto- mobile field is to study, and there is no better way to do this than through a home-study course with the International Correspondence Schools. We say this because many of the leading figures in the automobile world today are former I. C. S. students. The list includes Jesse G. Vincent, Vice- President of the Packard Motor Car Co.; Walter P. a President of the Chrysler Motor Corpora- tion; E. V. (“Eddie”) Rickenbacker; Hiram Walker, Chief AS. of the Chandler Motor Car Co.; ]. V. Whitbeck, President of the Cleveland Auto- mobile Co., and other men equally as famous. Just donate and mail the coupon and we'll send you information about the I. C. S. Automobile Courses or any other course in which you are interested. INTERNATIONAL CORRESPONDENCE SCHOOLS Box 7692-D Scranton, Penna. Oldest and largest correspondence schools in world Without cost or obligation on my part, please tell me how I can qualify for the position or in the subject before which I have marked an X: (2 Cemplete Automobile Course ( Gas Engine Operating ~ Automobile Electric Equip- [) Complete Gas Engine ment Course [Electrical Engineering OArchitect { )Electrie Lighting (JArchitects’ Blueprints L)Mechanical Engineer (Contractor and Builder L}Mechanical Draftsman UJArchitectural Draftsman [\Machine Shop Practice (Concrete Builder Railroad Positions (Structural Engineer Civil Engineer OOChemistry Q Pharmacy Lisurveying and Mapping CJAirplane Engines )Metallurgy O Mining LjAgriculture and Poultry LSteam Engineering ( Radio ()Mathematics ‘BUSINESS TRAINING COURSES CiBusiness Management (CSalesmanship “Industrial Management _jJAdvertising jPersonnel Organization (Better Letters fraffic Management COShow Card Lettering jBusiness Law (JStenography and Typing Banking and Banking Law L)Business English Accountancy (including C.P.A.)()Civil Service [Nicholson Cost Accounting (JRailway Mail Clerk L: Bookkeeping (Common School Subjects Private Secretary (COHigh School Subjects Lispanish (© French Cilllustrating the Name Street Address EE ratio sascsich onaptonelislepieipnaninninentie RRR: 5c scctnireasesSpnenenen I inn ck gccsscccsseanlebeuctwipicktetsconnbassstexcctubevness 3f you reside in Canada, send. ‘this coupon to the Interne tional Correspondence Schools Canadian, Limited, Montreet Every man should wear a ‘JINX’? Patented Complete protection of watch against theft or dropping. Watch can be withdrawn only by wearer. If watch is forced the prongs on JINX grip in pocket, safeguarding watch. Sample JINX sent for 25cents. Write for special quantity prices. Novelty Invention Company B. & H. Posner 1072 Bryant Avenue New York City We need a few good men in our organization Getting Ahead? Read the advertisements on Pages 116 to 142 this issue if you want to get ahead! POPULAR SCIENCE MONTHLY Gas Furnace Used for Heating Tools at the Bench HE gas furnace illustrated was made by the tool man of a small shop and is intended to be kept close at hand on the bench. The shell is of pipe with the HINGED COVER FIRE CLAY LINING | This small bench gas or oil furnace is a clay- lined pipe with an old brake drum for a cover bottom and feet welded on. The cover is made from an old brake drum. The burners, flared bell-mouthed, are welded in, and are tilted slightly so the flame follows a spiral course upward. The furnace may be used for either gas or oil by providing the proper burners. The lining of the furnace and cover is fire-clay, carefully applied as dry as pos- sible-—Frank N. CoaKLey. Universal Boring Bar Joint WwW a large boring bar is held in rigid alinement with steel guide bushings, trouble is sometimes experi- enced from binding or chafing. This dif- ficulty is accentuated*if the bar has to pass three or more bushings, as is often the case in large jigs. The trouble frequently is traced to im- perfect alinement of the guide bushings with the machine spindle. A simple rem- edy is to use a universal joint for con- necting the bar with the spindle. This usually will overcome the difficulty and incidentally save time wasted in trying to, correct the fault. The idea applies to vertical or horizontal machines. Draftsman Uses Wedges to Aid in Drawing Threads Quickly EDGES to go between the head of the T-square and the drawing- board will save a draftsman’s time and insure uniform angles on threads, bevels of structural shapes, and the like. They can be made in a few minutes of hard wood planed to the desired angle. Two large thumbtacks prevent them from fall- ing out of place —W. UHLMAN. May, 1926 Makes Old Ford a Tracto; Handles Easily Turns in 1S’ Circle S We furnish everything for converting Ford Auto Chassis with engine into a handy Farm Tractor. Just right for truck growers, small farms, nurseries, etc. Pulls 16” Plow, Discs, Seeds, Cultivates; Runs Belt ‘Machinery. We also build Garden Tractors and Cutter Bar Mower Attachments. Writefor Free Particulars ShawMfg.Co.,Dept.P, Galesburg. Kan, Squab Book FREE Printed in COLORS. Enlarged. Much News. Squabs are raised in one month, they sell for high prices. Greatest market for 20 years. Make *. money breeding them. We ship everywhere on ». three months’ trial our famous breeding stock. All pigeon supplies. prices and — 7 ole. Established 25 years. For tal bartispisrs see our heautiful frea e Money with Squads with Kell J in = ak site for it today PLYMOUTH ROCK SQUAB CO. 16 H St., Melrose Highlands. Mass, SEND FOR THE INTERNATIONAL CATALOG Our net price list Full line of auto S- bodies and & © © @ ssories for Fords at Wholesale Prices. Save big money on eee 5 ve buying Jirec Pt FOR FORDS-— Prices from $27.8 yw bt de consumer direct—Pay:Only = Profit International Body Works, 914 W. Ohio St., Dept. 8, Chicago, Ill. ONE DAY 24kacint PAYS BIG Make $150 to $300 monthly profits with HB One Day Battery Charging. One Day Charging demanded by auto and radio owners. Only $35 brings complcte HB outfit. 30 days trial on moneyback guaran- tee. Write for free Bulletin 5. HOBART BROS. CO. Box P 5, Troy, Ohio. % Print YourOwn Cards, stationery, labels, paper, _.. circulars, tags, menus, book ete. Save money and time, cut cost in A\alf. Sold direct from factory. Pays for itself in a short time. Complete Outfits, $8.85 up. Job Press, $12, $353 Rotary $150. Print for Others Big Profits. All easy, rules sent. rite for catalog of presses, type, paper, ecards, envelopes, paper cutters. The Press Co., E-33, Meriden, Conn. BUCHSTEIN’S FIBRE LIMB is soothing to your stump— strong, cool; neat, light. Easy payments. Braces Guaranteed 5 Years For all Send for Catalog Today deformities P. BUCHSTEIN CO., 610-3rd Ave., So., Minneapolis, Minn "LESS THAN HALF COST , \ Ace se pet Cleveland, arley-Davidson,Hen- Tse Te a norteten and Vaan” Ma Sidecars, new, use aah HM rebuilt. Rider ! Wanted. Write for REE offer ent’s free outfit, and big areain bal- in.New American Bicycles J in different styles and colors. Write for illus- \ \ trated catalcg giving our money saving prices. \N AMERICAN MOTOR CYCLE CO. % 2047 W. Chicago Ave., Dept..534 Chicago The Midget “‘Five-in-One’’ Slide Rule is a combination Mannheim, Polymet- ric, Log- Log inary, Add and Sub- tract Slide Rule. It will instantly add, subtract, multiply and divide any com- bination of whole numbers, fractions, mixed numbers and decimals. Gives every root and power, also Logs, Sines and Tangents. Made of aluminum with scales on white celluloid. Size 4 in. Ap- proved and adopted by colleges. Price Sie ay yk $1. oe Lem: cane 50c extra, Sent if desir alogue Free. GILSON SLIDE RULE (Patented 1-17-22) CO.. Niles, Mich. $100 in Prizes See Cash Prize Offer on Page 4 in front advertising section © This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. ‘See page 6. Mays 19% gl

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say, 1926 POPULAR SCIENCE MONTHLY 113 Try thi asti rath ai MEASURE aX Bra n YOUR KNOWLEDGE Ae | ie ds ] with the ie POPULAR SCIENCE oe is talking about the famous “Popular Science QUESTIONNAIRE Questionnaire.” Doctors, Lawyers, Professors,College Grad- QY uates and thousands of others have tested themselves with this Questionnaire. In the panel is the list of questions of which the Questionnaire is composed. How many of them can you answer? 1. Why does radium continue to give out heat for thousands of years? ........ 2. Are the stars solid like the earth? 3. How was the earth formed? -........- 4. Why is glass transparent? --.....------- 5. How do we know that the earth is slowly shrinking? --..-.-..- = 6. What is an electric current? 7. How was petroleum formed?.......- 8 Do electrons really move through wire when an electric current is flowing through it?... 9. What physical changes in your body are produced by fear?...........- 10. How do muscles exert power? 11. What are X-rays? .....-..-.--..------2----- = 12. Can weseeatoms witha micro- scope? 13. Why does heat expand things and cold contract them?................ a 14. Why does the moon ap»ear to change its shape from time to time? 15. What is the brain made of?............ 16. Why is it possible that the in- side of the earth is growing hotter instead of colder? 17. Why is frost more likely on a clear night than on a cloudy one? 18. Does thinking use up the Like an Old-fashioned Examination May we ask you to make this test carefully, reading thequestions slowly and giving thought to each one? When you cannot answerone satisfactorily to yourself, put a zero (0) beside it. On the other hand, give yourself credit of four (4) for each satisfac- tory answer. Then when you are through, see how near you have come to making a mark of 100. This is like an old-fashioned exa- mination, but you will find it fas- cinating. The questions all have to do with the wonders of the world we live in. All can be given quick and straight forward answers by any person of education. All of the questions in the fa- mous “‘Popular Science Question- naire’ and many hundreds of others, have now been answered, for the first time, in one book— Tue Pocket GuIpDE To ScIENCE. All that you probably ever will want to know about science is told in this one 284-page book that will fit in your pocket or gracea library table. Curiosity-satisfying facts about the world we live in aremade instantly available to you in simple question-and-answer form in THE Pocket GuIDE To ScIENCE. You are assured of the ac- curacy of the answers in THE Pocket GuIDE To SciENcE be- cause it has been edited by 19. Which travels faster, electri- city or light? 20. What simple test will distin- 21. What makesthe noise of thun- der? 22. Why would men ultimately suffocate if all the green plants were killed? 23. Does the boiling of water re- move the impurities in it? 24. How do the living cells of the body gettheenergy with which todo ther Works —.................... 25. Howis the speed of light mea- sured? TOTAL PERCENTAGE...----------- Into this one brilliant book of 284 pages has been con- densed the outstanding facts about’ the world we live in. SEND NO MONEY : R SCIEN 34 and a 14 Send no money, just the cou- — Avenue, oan Gutpr TO — will pay the pon. If within 10 days after you L accept your © er of khan SCIENCR vers the Pore and e : ; prion n he f the DOO* ©. pose = — and magazine months’ suse" plus the postage wees MON poe them ae you decide that you are not sat- ae Go frst issue Of POPUL ory to me Twill payment. Fie - isfied in every particular, you nagezine are Ni fully sat tly refund my may return them, and your en- 10 days and you are 2 tire payment will be refunded stamp my name in & ve promptly and without ques- a = LS. 3 tion. Could any offer be fairer? Nameenene ern ee all ee POPULAR SCIENCE MONTHLY | 422% cial 250 FOURTH AVENUE = NEWYORK | jpy_--——y77sy prefer send $2.99 WT & This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS, See page 6. Dr. E. E. Free, who has remarkable genius for condensing the known facts about scientific questions in- to easily remembered paragraphs. SPECIAL OFFER Tue Pocket GuIDE TO SCIENCE is not for sale. It is offered to you without one penny extra cost with a 14 months’ subscription to Pop- ULAR SCIENCE MONTHLY. Poputar SciENcE Montuty “car- ties on” from where THE PockET Gu1pE To ScIENCE leaves off. THE Pocxer GuIpE gives you all that the scientists have discovered up to right now— PoPpuLaR SCIENCE Monty will give you all the im- portant, interesting and new dis- coveries of science for the next 14 months. It takes over 300 articles and pictures every month to tell the readers of PopuLAR SCIENCE Montnty all that has happened in the scientific, radio, mechanical and automotive fields. Your Name in Gold Tue Pocxet Guiwe To Science is bound in beautiful flexible fabrikoid. We will stamp your name in 22-carat gold on the cover of THe Pocket GuibE at no extra cost to you if you use the coupon below immediately. We extend to you the Special Offer of a 14 months’ subscription to Poputar Science MonTHLy (regular price by the month would be $3.50) with the Tue Poc- KET GuIDE TO SciENcE—all for $2.95, plus the postage. If you are already a subscri- ber to Poputar Science we will extend your subscription 14 months if you accept this offer. . S. 5-26 CE MONTHLY :

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POPULAR SCIENCE MONTHLY Therats A “Rapio” Bungalow In The Size You Want! "THESE now rooms with porch. NTRODUCED for the first time last sum- wonderful Summer bungalows are made in 6 sizes, varying from 3 to 5 mer, the Bossert ‘‘Radio” Bungalow sprang into instant popularity among vacationists everywhere. Whether for seashore or mountains, the “Radio” is the ideal type bungalow. [™ is easily erected by unskilled labor within a day and a half. Being really portable it can be taken down quickly and put up again without trouble. Sturdily built, lasts for years. Immediate shipment. Send 20c for our new 48 page catalog F. O. B. BROOKLYN $500 ~ *8720 “RADIO” Garage Only $2 td 5 ii. Brook: Handsomely sad Comes sectional-built; 12 ft. x 18 ft. inside measurements. Strongly con- structed. An at- tractive addition Can be erected by unskilled Carried in stock for imme- Priced from to any home or estate. labor in 8 or 10 hours. diate shipment. LOUIS BOSSERT & SONS, Inc. “Largest Lumber Plant in the East” 1310 Grand St. (House Dept.), Brooklyn, N. Y. LOFT! = The Old Reliable Original Credit Jewelers Dept. N-871 108 N. State St. Chicago, Ill. Stores in Leading Cities CASH or CREDIT It’s Easy te Own a Genuine Diamond Ring 5 Our immense stocks include thousands of the latest mountings in platinum and as polid gold, allset with bril- es Zz. liant blue white Dia- = monds of exceptional quality. Order today and get your ring at once. Pay 10”, , down—we ship oods i diatel y- weekly, semi-monthly, or Ally Wy monthly as convenient. \Z. Big Diamond Book FREE! Write for It Today! (soon: | The Greatest Sea Rescue (Continued from page 13) snapped the line! In desperation, the rescuers tried to send lines over by tying them to floating casks; but the breakers swept the casks out of reach. It was at this desperate point that Chief Engineer Turner, searching his mind, hit upon an idea from the experi- ences of his boyhood. He built a kite seven feet high and four feet wide, with two wooden crosspieces covered with oiled linen. For his string he found a ball of stay lace used for engine packing. E’LL fly the kite from the deck,” he told his men, “‘and when it is well up and beyond the Antinoe, we'll drop it by suddenly paying out the string. The string will fall on the An- tinoe’s deck, and her crew can haul it in.” That this idea was a thoroughly prac- tical one was vcucned for a few days ago by Dr. Miller Reese Hutchison, consult- ing engineer of the Naval Consulting Board, when he proposed a combination kite and breeches buoy device as a sub- stitute for the Lyle gun. Only instead of dropping the kite, as Turner proposed, Dr. Hutchison would pay out heavier and heavier line, making the kite drag it along until it touched the side of the derelict vessel. Then, with the aid of this line, it would be possible to pass from one vessel to the other the cable for an or- dinary breeches buoy strung between the | cargo masts of the two ships. URNER’S kite, however, was not flown during the rescue, although it was tried out later by a number of the passengers. In its place the engineer | hit upon another idea. It was apparent that the projectile, on leaving the gun, ‘did not speed away on an even keel, nose first, but turned end over end through the air. Would not the sudden jerking strain on the line be re- lieved if the length of the spindle were increased, thus making the projectile swing in a wider arc? And why not fur- ther relieve the jerk by means of a spring? It so happened that among the pas- sengers on the Roosevelt was an American artillery officer, Colonel Clint C. Hearn, an expert in the science of ballistics. With him Turner discussed his idea, and then turned again to his machine shop. This time he made the spindle four feet long instead of eighteen inches. He made a spring of brass eighth-inch wire which he wound into a spiral over a bar re- volving in the lathe. One end of the spring he fastened in the eye of the spindle. The other formed a loop for t1.e shot line. When the shot was fired, the spring eased the jerk, and the line held. And so out of the stress of grim necessity was born a worth-while invention. A few days after the return of the President Roosevelt, I visited the Brook- lvn home of the ship’s chief engineer. There I found him in the throes of building a radio set. Wires and solder and batteries were scattered about. He had burned a hole in therug withacid, and his good wife was scolding him roundly. “You see,” he chuckled, “I’m just getting in practice for another Antinoe.” rIS} This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6. May, 19% wn Boston Gar rter 7 om Lic / \ ke Dads Quality First é ty s WT Boys! Did You Know That you can get Boston Garters made specially for you? In every par- ticular, just the same as Dad’s, except that in size they are adapted to those of you beginning your first long trousers. Bostons are preferred by men who know good garters because they look a square the 14 The pu: blocks t | square, into re} fnal nu UDI! th world. | have s | \ recall i the fea the all ever W: | able, fe 15 are made | The ’eighti | world not a better, wear better and feel better. For those who wear knickers, ask for the Knicker Boston Garter. George Frost Company, Makers, Boston CNA [Amaze Your Friends With hemical Tricks “iON Minnnntnitii = The Write secret letters with invisible Bou’ 5 ink; pour blue, brown and _ black H liquid from a glass of water; makea ve Book | magic pitcher of bluing; make your o own magic writing paper, your own hemistry ink and dyes. It’s all easy if you have —. Chemcraft Junior—the pocket Chem- Pr ical outfit. Get yours now. Order ice] } cents right awxy and get a FREE Copy of pa ll The Boy’s Handbook of Chemistry: 100 p: of experiments, formulae, interesting coer ical information, money-mak ane suggestions and BOTH catalog of supplies. THE PORTER CHEMICAL CO. | 115 Washington St. Hagerstown, Md. EMCRAFT JUNIOR CHEMICAL OUTFIT price BS cents “DON'T SHOUT’’ “*T hear you. I can hear now & as well as any body. ‘HOW?’ With THE MORLEY PHONE. I've a pair in my ears now, but they are invisible. I would not know ad them in, myself, only that I hear all right.” The Morley Phone for the is to the ears what glasses are to the eyes. Invisible, comfortable, weight- Anyone can adjust {t. Over one hundred thow i ee ite for booklet and testimonials. THE MORLEY CO., Dept. 797, 10S. 18th Street, Philadelphia eens Coil Spring Moth Ball Holder A HANDY SPIRAL CONTAINER with removable cover. This simple device can be hung on clothes- hangers or behind the door-jambs, where its action is very effective in making the whole closet moth-proof. A box of moth balls will fill oR wy (8) holders. Price .50 per dozen. Discount g agents in gross lots. J. LEWERS 1888 cee “Ave. New York City What Could You Do with $50—? See the Cash Prize Offer on Page 4. DOWLYDDWY WAND DUT sisted | with ¢ | ings t were 1 ing th of th was d to ha’ | In \ ales, 1 | made | | the ] | doub | | is Te an ol with cut direc I an ¢ | cust well man Mid the the Kin den

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LM May, 1926 POPULAR SCIENCE MONTHLY asquare box in regular order, excepting the 14 and 15, which were transposed. The puzzle called for the moving of the blocks through the medium of the vacant square, with the object of bringing them into regular sequence, with the 15 the fnal number, as in the diagram. UDICROUS tales were told of the havoc this puzzle wrought in all parts of the world. Although thousands claimed to have solved the puzzle, no one could recall the sequence of moves whereby the feat was accomplished, and none of the alluring prizes offered for the solution ever was collected. The puzzle is unsolv- able, for the reason that when the 14 and 15 are reversed, compensation must be made by reversing two other blocks. The Pigs in Clover puzzle which in the eighties succeeded the “14-15” as a world disturber, was, strictly speaking, not a problem, or puzzle, at all. It con- sisted of a circular cardboard box filled with a series of partitions, having open- ings through which a number of marbles were made to pass by shaking and inclin- ing the box, the object being to drive all of the marbles into a central pen. It was designed as a child’s toy, but proved tohave such alluring qualities that grown- ups became absorbed in the pastime. In the sequence of world-famous puz- ales, my Missing Chinaman puzzle, which made its appearance in 1896, next caught the popular fancy. Many readers un- doubtedly will greet this puzzle, which is reproduced at the top of page 24, as _anold friend. Those who are not familiar with it, I am sure, will be repaid if they ‘cut it out of the magazine according to directions and attempt its solution. I introduced this puzzle primarily as an advertising novelty. My first large ‘customer was Carl Laemmle, now a well-known motion-picture producer, then manager of a department store in the Middle West. Among others who used the puzzle for advertising purposes was the campaign manager for William Mc- ‘Kinley in the latter’s race for the presi- dency against William Jennings Bryan in | 1896. A million of these puzzles were distributed that year in the interest of the Republican candidate. T MAY interest movie fans to know that when I showed this puzzle to Mary Pickford a few years ago, this sharp-wit- ted little lady, who, like her husband, Douglas Fairbanks, is a good puzzler, after a period of concentration on the shifting circle, proved herself a better solver than untold thousands of other puzzlers by correctly answering the ques- tion, “Which man disappears?”’ . Her re- ply to the puzzle’s secondary query, “Where does he go?” proved to be too complex for mental assimilation by any member of her gallery. See how well you can do with this puzzle. Another puzzle that attracted wide attention, which I first brought out in 1900, is that of the Three Houses and Three Wells. You'll find this puzzle on page 24. I unhesitatingly meaennee 8% my “best puzzle,” on the score of in- y p ~ Can You Solve the Greatest Puzzles? (Continued from page 24) genuity and its interest appeal to puzzlers. It seems to enjoy perennial popularity. Notwithstanding that it has a perfectly fair answer which I have published re- peatedly, seldom a day passes without somebody writing to ask if it can really be done. These requests have come from all parts of the world, and for years I have kept the solution in printed form to take care of the numerous inquiries. HE Clock Dial puzzle, which is repro- duced on page 24 is another whose popularity has never waned. Requests for the solution have reached me almost daily since I introduced it in 1909. See whether you can work it out. The arrangement of numbers in the form of squares so that they will add up to the same total in every column and row as well as in the two diagonals is without doubt the oldest of all mathe- matical puzzles. “Magic Squares,” as these arrangements are called, were held in veneration by the Egyptians, who im- puted to them real magical power, and to this day Chinese and Korean soldiers carry charms in the form of magic squares to protect their lives. An interesting puz- zle based on the magic square principle is presented on page 24. It is astonishing and amusing how fre- quently this puzzle is rediscovered by modern mathematicians. Scores of times this old puzzle has been offered to me for explcitation by sincere persons, who hap- pen to be several thousand years late with their inspiration. ROM time to time I have originated mathematical problems based on a complication of facts concerning ages. These usually can be solved best by alge- bra. The most popular of these was the following, which I present in its original wording: How Old Is Ann? Johnny had a working agreement with his sisters covering the suppres- sion of family history, so when the census man inquired as to the ages of Mary and Ann, Johnny clouded statistics m the following truthful statement: “The combined ages of Mary and Ann are 44 years, and Mary is twice as old as Ann was when Mary was half as old as Ann will be when Ann is three times as old as Mary was when Mary was three times as old as Ann.” How old is Ann? Can you figure it out? It’s really not so complicated as it sounds—if you go at it quietly and unhurriedly. Anyway, I am going to give you the answer, and the solutions to the other puzzles I have pre- sented here, and tell you some more about puzzling, in the next issue of PopuLAR SCIENCE MonTHLY. This is the first of two intriguing articles in which Sam Loyd relates the experiences of alifetime of “puzzling,” and presents for solution the puzzles which he regards as his best. The second will appear in our June 115 1 Jewel Burlington. em, Buss.ncron ‘i ‘if “ie Vi Pal wi al Al vii 5 wh LOOK ! Adjusted to the Second Adjusted to Temperature Adjusted to Isochronism Adjusted to Positions 21 Ruby and Sapphire Jewels 25 Year Gold Strata Case Your choice of Dials Including M v Railroad Dial) Hees Ideas in Thin Cases oJ OO ‘Down Only One Dollar Down will buy this masterpiece of watch manufacture. The balance you are allowed to pay in small, easy monthly payments. The Burlington — a 21-Jewel Watch — is sold to you at a price much lower than that of other high-grade watches. Besides, you have the selection of the finest thin model designs and latest styles in watch cases. Don’t delay! Write for the FREE Watch Book and our Special Offer today. Write While this Special Offer Lasts Get the Burlington Watch Book by sending this coupon. Find out about this great special offer which is being made for only a limited time. You will know a great deal more about watch buying when you read this book. You will be able to “‘steer clear’ of the over-priced watches which are no better. Remember, the Burlington is sent to you for only One Dollar down, balance in small monthly payments. Send the coupon for watch book and our special offer Today! Do not delay one minute! issue. © This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6. Burlington Watch Co., Dept. 13.65 19th St. and Marshall Blvd., Chicago, Illinois Canadian Address: 62 Albert St.,Winnipeg,Man. Please send me (without obligations and prepaid) your free book on watches with full explanation of your $1 down offer on the Burlington Watch. Print name and address plainly Name Address Penececcesesesscescscsecsescscsesssassande SPCCCRTSTCCSESCRCE STE ESReeeeeeeeeEee

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116 POPULAR SCIENCE MONTHLY May, 19% RAILROAD FARE TO CHICAGO Included Without Extra Cost‘ If You Act RIGHT AWAY! r . ‘ore yp SRT LOS ae >> asTaught in COYNE Shops Puts You In the Big-Pay Class Quickly! HUNDREDS OF COYNE-TRAINED MEN EARN : poe * Student Winding Stator at CO YNE : COMPLETE ELECTRICAL TRAINING RAILROAD FARE TO In 12 Happy Weeks at COYNE My newly enlarged Electrical Course is the result of 27 years of expe- gene solving ee needs 4 of young men and of the ONCE. Get full | ElectricalField, COYNE ae "thi ars be- | has been teaching Elec- fore this amaz- | tricity in a PRACTI- ing offeris with- | CAT, way since 1899. drawn. My course is thorough, easy to master, and fits men for BIG Electrical CHICAGO included wit h- out extra cost if you act AT Students Constructing Outdoor Substation at COYNE You Don’t Need Advanced Education or Experience to Learn at COYNE Every COYNE student jobs, the HIGH-SAL- pytuigent Ceone Students pro- 3 ducing pry. ARIED thrilling jobs. Electrical’ School icial light ine nino We Teach Electricity and great shops of a Nothing Else Coyne COYNE teaches only ONE thing— students ELECTRICITY. We are SPECIAL- operating STS. Our interests are not divided, larye switch- nor is Electricity a sideline or merely an ‘additional’ sub- ject with us. receives INDIVID- UAL and PERSONAL instruction, on COM- PLET Eelectrical appa- ratus, under EXPERT INSTRUCTORS, in the COYNE Shops at Chicago. Send for Big FREE Book! Send for a copy of my big, attractive Elec- trical Book. It is 12x15 in size. Contains 151 photos of electrical scenes, dynamos, radios .autos,airplanes, farm lighting and pre ete. Absolutely TREE. SEND COUPON NOW You Can Start Any Day of the Year at COYNE— No Classes or Seasons. Get the Coupon Mailed Right Away so that You May Read Full Particulars of My Course. My Big FREE Book will maze You! Tune in on COYNE Radio Station WGES Earn While You Learn at COYNE. My Employment Department will help you. H. C. LEWIS, President s COYNE ELECTRICAL SCHOOL ] d 1300-10 W. Harrison St. ' ‘ Dept. 1365, Chicago, Ilinois g , . oe nd _— Et ge =. a. mee big. é andsome FREE 2-color books, with 15 hotographs. Be sure to tell me all about 4 ELECTRICAL SCHOOL eee H. C. LEWIS, President Established 1899 ics ‘ 1300-10 W. Harrison St. Dept. 1365 Chicago DE ins chek Guean essed soe sonore we ° ° Traini 4 aS ee>> st There is no Substitute for Personal Training, in RN ur cksScusbstemhseauseusere ‘ Great Shops, on COMPLETE Apparatus Readers of POPULAR SCIENCE MONTHLY will find scores of oppor- tunities in this section (pages 116 to 142) for making more money. teacher’s salary. Do You Need a Self-Starter? (Continued from page 4) Dear Sir: Whenever I come to the advertisement in the. Money-Making Opportunities Section referring to the National Salesmen’s Train- ing. Association, I always pause to express my respect for that Institution. About a year ago I investigated the merits of the school to see what it could do for my step-brother, and was so pleased with the thorough manner in which a novice is drilled in the principles of the art of salesmanship that I immediately enrolled my brother, making the payments out of a meagre (Continued on page 117) *100 in CASH PRIZES For the best letter of 150 words or less answering the question— ‘‘What advertisement in the ‘Money-Making Op- portunities’ Section inter- ests you most—and why?” we will pay on June 10th the following— CASH PRIZES First Prize $50.00 Second Prize 25.00 Third Prize 10.00 Fifteen Prizes of $1.00 Each 15.00 First read every advertisement in the Money-Making Oppor- tunities Section on pages 116 to 142. Pick out the one that in- terests you most and then write a letter—not exceeding 150 words —telling us why you find the advertisement you have selected the most interesting. Entries for the contest will close on May Ist. The prize winners and their letters will be published in the July issue of POPULAR SCIENCE MONTHLY. Address your letter to Contest Editor MONEY-MAKING OPPORTUNITIES POPULAR SCIENCE MONTHLY 250 Fourth Ave., New York An tells 1 “Mon haps - refers Dear Ur an 0] those lette sell t As large ica Chic get @ poor servi Tl like cash ScIE who the s AY printi tory ¢ taugh instru of ma says" Con Sc Mor of F of sp beca as b Tuis teac Isnt scho and stud min inve atte the pate Clar Mar W in F big fees, stud atto fear as u the dire Mr. D. | e

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— O09 oe UO OO TD May, 1926 Do You Need a Self-Starter? (Continued from page 116) The ability to emphasize the merits of a product, to persuade, to convince, to be osst, straight-forward, and upright—in short, all the tools that go to make not only a good salesman but also a better citizen and home maker are now my brother's for the rest of his life. Little wonder, indeed, that I highly esteem the N.S. T. A Avueust P. HerptrELpeEr, Romney, West Va. A man, who is in a position to know, tells us what he thinks of one of the “Money-Making Opportunities.” _Per- haps you are one of the thousands he refers to in this letter: Dear Editor: Under “ Business Opportunities” I notice an opportunity which thousands need. A. Allard of Montreal, Canada, offers to those who are seeking a better position a letter of application and instructions how to sell their services—all for $1.00. As a supervisor, connected with one of the largest employment organizations in Amer- ica (The Western Electric Company, Chicago) I know that many persons fail to get a reply to their application because it is poorly worded and does not sell their services. There are many good correspondents who, like Mr. Allard, could turn their ability into cash by advertising their services in PopuLaR Science, and there are many good people who could secure better positions by using the services of people like Mr. Allard. G. H. BENNETT A very interesting letter, that we are printing below, comes from a Prepara- tory School Instructor who has not only taught English to his pupils but also instructed them as to the ways and means of making money. This is what Mr. Lyon says* Contest Editor: Some of the advertisements in your Money-Making Opportunities Department of PopuLAR ScrENcCE Montuiy have been of special interest to me. This is not so much because I have made money by them myself, as because I have enabled others to do so. Tunis seems to be the ironical lot of the teacher to tell others how to make money. Isn't it true! As English instructor in a large preparatory school in the heart of Pittsburgh’s industrial] and commercial district, I get a good many students of a decidedly mechanical turn of mind, some of whom are working on useful inventions. I have been able to call the attention of a number of these students to the advertisements of a number of reliable patent attorneys, such, for example, as Clarence A. O'Brien, page 143 of your March issue. We have plenty of good patent attorneys in Pittsburgh but many of them handle the big local cases with correspondingly big fees, so I have found that some of my students hesitate to approach _high- fee attorneys with their patentable ideas for fear the ideas may not be received favorably, as unlikely to promise big results. These are the students that I have been pleased to direct to such reliable patent attorneys as Mr. Clarence A. O’Brien of Washington, D GrorcE W. Lyon (Continued on page 118) We Mail % MONEY MAKING OPPORTUNITIES SECTION our of This Book-FREE 117 Copy Remarkable new book on Salesmanship just off the press will be mailed to you without cost or obligation T= contents of this amazing new book— just published by the National Sales- men’s Training Association—will prove a revelation to every man who is interested in making real money—and to those who realize the tremendous possibilities for high earnings in the selling field. Thirty thousand copies of this book will be mailed free without cost or he was arte $20 a week. N.S elected an officer of Postl’s, Chicago. TYPICAL EXAMPLES OF SUCCESS When A. H. Ward, Chicago, returned from the war He enrolled with the A. and last year earned $13,500 and was J. H. Cash, Atlanta, Ga., jumped from $25 a week to $500 a month. M. a week when he enrolled. he was earning $125 a week. V. Stephens, of Albany, Ky., earned $25 His last report showed O. H. Malfroot, Bos- ton, Mass., steoped into a $10,000 position as Sales Manager—so thorough 1s this training. obligation to those who send for it while the supply lasts. FULLY EXPLAINS NATIONAL DEMONSTRATION METHOD Thousands have wondered why N. S. T. A. Members invariably make good, in a big way, right from the start, even though they have had no former selling experience, or why salesmen who have just oo along with indifferent suc- cess quickly begin to outstrip their brother salesmen after becoming mem- bers of the Association. Among other things, this remarkable free book explains just why success comes rapidly and surely to those who enroll for this an:azing System of Sales- manship Training. sis and EMPLOYERS are invited to write to the Employment Dept. of the N. S. T. A. No charge for this service to you or our members. ployers are also cor- dially invited to re- quest details about the N. S.. T. A. Group Plan of In- struction for entire sales forces. charts sent without obligation. You will find hundreds of similar suc- cess stories in our Literature—successes you can easily duplicate. BIG DEMAND FOR TRAINED SALESMEN City and traveling sales positions are open in every line all over the North American continent. For years thousands of leading wholesalers, jobbers, and manu- facturers have called on the Association to supply them with salesmen. Employ- ment service is free to both employers and members, and thousands have secured po- sitions through this service. Surely this is a glowing tribute to the thoroughness and practicability of our System of Salesman- ship Training and Employment Service. JUST MAIL THE COUPON THE BOOK IS FREE To fill in and mail the coupon will not Em- Synop- QUICK SUCCESS THROUGH N. S. T. A TRAINING Whether you have had selling experience or not, it makes no difference. The N. 8. T. System of Salesmanship Training will enable you to become a Master Salesman in an amazingly short period of time. It will teach you, in your spare time, at home, the fundamental! rules and principles of selling—how to approach diiferent types of prospects to get their undivided attention—certain ways to stimulate keen interest—ways to overcome objections, batter down prejudices, outwit competition, and make the pros- pect act. Step by step this Training takes you through every phase of Salesmanship. Every underlying principle of the sales strategy is made as simple as A B C. Through the National Demonstration Method, you get actual experience on practically every type of siles problem that may ever present itself. And through the instruction in Character Analysis you will become an expert in reading character on sight— a valuable asset for any salesman. you the way to be a obligate you in any way, but it will show “star’’ salesman. It will pay you to let us send you this valuable and interesting book. Fill in and mail the coupon and get it into the mail sometime today. Dept. E-, N.S.T.A. Bldg., Chicago, Illinois National Salesmen’s Training Ass’n Dept. E-15, N. S. T. A. Bldg., Chicago, Ill. Without cost or obligation you may send me your free book, ‘‘Modern Salesmanship,’’ and details of your System of Training and Free Employment Service. Name.. Se ee re eee eee ere City.. a Ase. PM 5 65:55: 405 ee ee ee

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118 MONEY MAKING OPPORTUNITIES SECTION Your Own tu: Shop with a ‘‘ LITTLE SAVAGE GRINDER’’ One Man $ 1 000 Made Within a Few Weeks 3 R Under Our Wonderful New eports Big Profit Plan, Sent FREE! BE YOUR OWN BOSS! Know the joy of manly independence. BE FREE! Come and go as you please. SHARP- EN Lawn Mowers, Paper Cutter Knives, Planer Knives, Cutlery, Skates, Make Keys—every household, every store is your customer. Permanent, pleasant, easy business. And your own snug little shop! Write today for our Big Profit Plan—it’s FREE. Just ad- dress BROWN MACHINERY CO. GREENEVILLE, TENN. Sure, Steady Quick, Easy Profits COPY THIS SKETCH and let me see what you can do with Cartoonists trained by this school are earning from $50.00 to $200.00 or more Landon Picture Chart Method of teaching makes original drawing easy tolearnat home in sparetime. pend sketch with 6¢ in stamps for full information and sample chart to test your ability. Please state age. THE LANDON SCHOOL 1451 National Bldg. it. per week. The The University of Chicago Courses in English, History, Chemistry, Business, Mathematics, Education, Psychology, and 35 other subjects command credit toward a Bachelor degree. Begin any time. Address 25 Ellis Hall, University of Chi » Chi » Ill. CLEVELAND, 0. ae lee st = =? oo am Earn $2,000 to $10,000 a Year! Why work for small pay? Learn a good trade. Know autos—how to repair % them. Get a better job—Now! Or a business of your own. Learn in a few weeks here at the great auto-trade school in the heart of the auto industry. Think of the repair work on eighteen million cars! There are not nearly enough trained men to do this work. TRAINED Auto Men Are Wanted! You can be a skilled mechanic and auto electrician and Earn Big Money. Experience not necessary. If you are mechanically inclined come to Detroit now to the Old Reliable ‘‘Michigan State.” Learn Autos in Detroit T= BEART.CF THE INDUSTRY Here you have wonderful advantages. Study autos, trucks, engines, auto electricity, tractors. i All on best equipment, up-to-date. Many new cars including Packard “Straight Eight” with four wheel brakes, Buick Six (four wheel brakes), Oakland (four wheel brakes), new Oldsmobile, Hupp, Reo, Hudson, many others. Hundreds of engines and electrical systems. Expert instructors to teach you; a thorough course that slights nothing. Visit the great plants of Ford, Cadillac, Packard, Lincoln, Dodge, Hupp, Hudson, Studebaker, many others. These great companies endorse this School. Get factory endorsed training at Detroit, the Auto Center. Good Positions Open. Here’s your chance to be in- dependent. The demand for trained auto men is greater »% thanthesupply. Opportuni- ties every- where. Write * today for full in- formation about Detroit training to make the most money. Michigan State Automobile School 585 Auto Building Detroit, Michigan Get THe Facrs - Tooay / MICHIGAN STATE AUTOMOBILE SCHOOL, 585 Auto Building, Detroit, Mich. Send me FREE and without obligation complete infor- mation about Det roit-training to make the most money. ae Street or R. F.D.... AA ee ee ee eee RCT | | ae ees I am interested in (1 Resident Course at your school. 0 Home Study Course. May, 19% Do You Need a. Self-Starter? | (Continued from page 117) life. Decide now what you want to be in Read carefully all the: advertise. ments on pages 116 to 142. Then fill in the coupons or write the advertisers yoy select as being most interesting. These advertisers are ready and willing to help you. The booklets and other information they will send you will be extremely interesting and of great importance to your future. Complete List of PRIZE WINNERS In the March Contest FIRST PRIZE $50 Mrs..A. Lundeen, Forest Lake, Minn. : (Coyne Electrical School) SECOND PRIZE $25 Clarence M. Minott, Bangor, Maine (International Correspondence Schools) THIRD PRIZE $10 A. P. Herdtfelder, Romney, W. Va. (National Salesmen’s Training Assoc. ) PRIZE WINNERS who receive $1.00 each for their letters Harold W. Leath, Fort Collins, Colo. (Mokane Institute) G. H. Bennett, Milwaukee, Wis. (A. Allard) F. E. Rising, San Anselmo, Calif. (Coyne Electrical School) James A, Melton, Dixon, Ky. (Literary Bureau) J. D. Calvert, London, Ontario, Can. (Stephenson Laboratory) Earl C. Cooper, Athens, Ohio (American Technical Society) L. A. W. Johnson, Ashland, Wis. (Prof. Henry Dickson) Frank G. Davis, Harrisonburg, Va. (W. L. Evans School of Cartooning) Wallace Hamilton, California, Pa. (National Radio Institute) George W. Lyon, Pittsburgh, Pa. (Clarence A. O’Brien) Cono Puglisi, Tampa, Fla. (American School) Anna M. Dempsey, Los Angeles, Calif. (Sherwin Cody School of English) H. E. Howe, Glencoe, Minn. (North American Institute) N. H. Caskin, Marietta, Ohio (International Correspondence Schools) E. L. Maffitt, Oakville, Iowa (Clarence A. O’Brien) ansae- aearaaE. seeas BUREREESEECEERERATAIRRP RE EC CES | May, 192 $9,0 a ¥e os) eRe

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| SEE | By hSEUu 40 | Trained Men MONEY MAKING OPPORTUNITIES SECTION

$125 “Depend on meas a booster,” a s A. Schreck, Phoenix, Arizona. uF w make over $500 a month. Your ad- eek vertisement started me to success.” 800% Pay “I now make eight times what Slag, I earned when I enrolled. I used : to get $50.00 a month; now it’s $400.” Carroll Moeschler, Chaska, Minn. Get Ready NOW for a Big Pay Job in Electricity—Be An ELECTRICAL EXPERT I Will Train You AT HOME = In Your Spare Time Don’t you keep on working for only $25 or $35 a week. Get into Elec-

$9,000 coll non ae FN it a short time ago are now earning $70 to $200 a week as Electrical Experts—and a Year aycar. 58 men enrolled for this they don’t work half as hard as youdo. Why stick to your small pay job? Why raining on

tricity. Thousands of Cooke Trained Men who knew nothing about advice, stick to a line of work that offers no chance—no promotion—no big pay? Get into the world’s greatest business. Electricity needs you. I’llshow you how to doit. Get ready for the big pay job now.

Electrical Experts Are In Big Demand Even ordinary electricians—the “screw driver” kind—are making big money. but ined men—Electrical Experts who get the top salarics—are needed more now than ever before. Thousands of Cooke Trained Men easily earn $3,500 to $10,000 a year. That’s the kind of a job you want—where you can plan and boss and supervise the work of others or go into business for yourself. Get started towards one of these big-pay jobs now. Learn to earn $70 to $200 a week — you can do it with Cooke Trairirg — recommended by more than ten thousand successful uates. Just mail the coupon below. Age or Lack of Experience Bars No One You don’t need cxperience. You don’t have to be a College man. You don’t have to be even a high school graduate. As Chief Engineer of this big two million dollar institution which does a —— Consulting Engineering Business besides operating one of world’s great-

$700 in 24 Days

est Training Schools, I know just what training you need to make a big success in electricity. Let me give you that training with my simplified, complete [, L. COOKE, Chief Engineer home og yng —_ famous ‘‘Cooke a = lp my own 20 years of engineering experience wi o Employment nearly 60 other engineers. Learn to earn $70 to $200 a week—= This Big New Service — No | °y spare time needed. Electrical Book Extra Charge My Training Pays For Itself FREE! : 2 P You can start earning extra money a few weeks after The 1926 Edition of my big book — I will train you for a big you start my training. I give you special instruction for doin **The Vital Facts about Electricity,” pay job and then help you simple electrical jobs in yourspare time-—show you how to ge is just off the press! Clip coupon Ra get it without extra these jobs and tell you what to charge. Many of my students NOW for your copy —it’s FREE! Thanks to you, I made charge. Hundreds of Em- | make as high as $25 a weck extra this way while studying. 112 actual pictures of Electricity at poy 4 7s. in radio, piovers ioe to = my 9 the | My course more than pays its own way. Seek Geene ot ome a -G. ’ . clectrical men they hire. what you can do in the Big-Pay Pro- 16th St., Atlanta, Ga. Last year I placed over one Your Satisfaction Guaranteed bs fession — you’ll find it alfin my up- thousand men at big raises | JT am so sureI can make you a big success in Electri- to-the-minute electrical book. Send in pay. Hundreds of others city, just like I have done yor the men whose pictures you see for it today! were promoted by their here and thousands of others who now boost my training, that WON DE R FUL employers through the help I will guarantee your satisfaction with a signed, money-back of my Vocational Service ——— bond. If my training doesn’t satisfy you after = = a wo WORKING inte business for them- | million dollar institution stands back of this guarantee. OUTFITS~ special Business Trafaing. Get Started Now—Mail Cou G 1VEnW Wi t hou 6) ood which explains this ex tra laf) rE. / ‘ service and fourteen other men who recommend this training and whose names and addresses are Tet ourel AND EXPERI. Get the facts now — Mail Coupon at once for facts and my guarantee. iT. Comper: esting &* L. L. COOKE, Chief Engineer ” ourrIT CHICAGO a Inc. <p asian a iia elaine i id L. L. CSOKE, Chief Engineer, 2150 Lawrence Ave. 2° CHICAGO ENGINEERING WORKS, 0, Illinois 2 Dept. 35 “ of 2150 Lawrence Ave., Chicago, Ulinois

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Page 124

120 MONEY MAKING OPPORTUNITIES. SECTION May, 19% ADDING MACHINES FREE trial, marvelous new adding machine. subtracts, multiplies, divides automatically. equals $350.00 machine. Price only $15.00. Speedy. durable, handsome. Five-year guarantee. Used by largest corporations. Write today for catalog and free trial offer. Lightning Calculator Co., Dept. O, Grand Rapids. Michigan. ADVERTISING SERVICES ADVERTISE in 24 metropolitan dailies, 24 words, $15.00. Helpful Guide listing 1000 publications, 4c stamps. Wade Company, Baltimore Bldg., Chicago. 24 WORD ad 355 rural weeklies, $14.20. Ad-Meyer, 4112P Hartford, St. Louis. ADVERTISING in all magazines and newspapers at publisher’s lowest rates. Rate Book free. Taylor's Ad- vertising Service, Dept. 5, Freeport. Ill. ADVERTISE—Country papers. All publications. Lowest rates. Catalog free. Owl Agency, Times Build- ing. New York. ADVERTISE in 24 big Sunday Newspapers. 24 words $15.00. 300 Rural Newspapers 28 words $10.00. Big weekly newspapers 24 words $5.00. Service 1004. Consultation Free. National Advertising Service, Richmond Hill, New York. AUTHORS AND MANUSCRIPTS PHOTOPLAY—Story Ideas wanted. $25-$500 paid. Experience unnecessary; outline Free to anyone. Write Producers League, 312, St. Louis. SONG Poems wanted. Radio Publicity Bureau, 24 Times Square Station, New York. SONG Poem Writers send for proposition. Ray Hibbler, D10, 4040 Dickens Av., Chicago. I WANT song poems. Casper Nathan, J-3544 No. Racine, Chicago. SSS FOR IDEAS. Photoplay plots considered in any form. Write today for free booklet. Universal Scenario Corporation, 214 Security Bidg., Santa Monica & West- ern Ave., Hollywood, Calif. AUTOMOBILES AND ACCESSORIES CARBON-X will keep your engine “peppy” by keeping it free from carbon. Handy package and “Why Is Carbon ?"’ postpaid for dollar bill. Money back if you want it. Carbon-X, Box 1953, Chicago. BEAUTIFUL ornaments motor car mascots. for catalogue. United Auto Supply, 1922 Seattle, Wash. Adds, Work ,. Write Westlake, | Rates 30 Cents a Word. A 10% discount is allowed on all contracts for six consecutive insertions. Advertisements intended for the June, 1926 issue should be received by April 5th BLUE PRINTS BUSINESS SERVICES CHARTERS — Delaware; best, cheapest; granted day pean, Sone forms. Colonial Charter Co., Wilmington, el. (99) ‘ MAKE ’Em Pay—My system will make them their bills. Write for the acid test. Literature tree Burleigh L. Horr, Horr Omelia Block, Rhinelander, Wis. TO the man who has a Home Workshop and likes to work with tools, Popular Science Monthly offers the opportunity to purchase blueprints giving details of the construction of useful articles for the home. The follow- ing are a few of the blueprints available: No. 1, Sewing Table, No. 5, Kitchen Cabinet, No. 13, Tea Wagon, No. 15, Workshop Bench, No. 17, Cedar and Mahogany Chest, No. 41, One Tube Radio Set, No. 42, Radio Receiver with three stages of amplification, No. 43, Four Tube Radio Receiver. Send 25e for each blueprint that you wish to — Science Monthly, 242 Fourth Avenue, New York, BUSINESS Problems’ Solved—all kinds—buying Selling, financial, increasing business, advertising, get: ting men, getting positions, special formulas, processes ete. Long business experience, thorough research, com- plete files of information. Complete solution of problem $5, particulars free. Satisfaction guaranteed. All cop. fidential. National Information Bureau, 316J Shepard Building, Grand Ravids, Michigan. CHALK TALKS LAUGH producing program, $1.00. Cartoonist Balda, Oshkosh, Wisconsin. Catalog free. BUSINESS OPPORTUNITIES BUSINESS Guide with free legal service sells every- where. Wells cleared $1,185 in 35 days. Write for free outfit. Nichols Co., Naperville, Ill., Dept. 1B. USE£D correspondence schoo! courses. All kinds. Sold on re-purchase basis. Big saving. Money back guarantee. yn free. (Courses bought.) Lee Mountain, Pisgah, Alabama. LEAKN the collection business. Good income; quick results. Interesting booklet, ‘Skillful Collecting,” free. National Collector's Association, Science Building, New- ark, Ohio. BECOME a Foot Correctionist. not medical nor chiropody. All the trade you can attend to; many are making $3000 to $10,000 yearly, easy terms for training by mail, no further capital needed or goods to buy, no agency or soliciting. Address Stephenson Labora- tory, 10 Back Bay, Boston, Mass. START a factory. Employ agents and salesmen. Make big money. Our free booklet “125 Money Making Secrets’’ explains how you can manufacture chemical specialties, household goods, toilet articles, pe micrsnen' medicines, food products, etc. No experience required. Nelson Laboratories, Box 1217, San Francisco, Calif. STOP plodding! Be successful. Operate a tire repair shop. Make big profits in any locality. We teach you and furnish complete equipments, $100 up. Book of Oppor- : awa d free. Haywood's, 1306 South Oakley Avenue, ‘hicago. A New Profession PAINT your own Auto. Simple methods. Something New, Smooth Finish. Also Discussing Duco, $1.00 brings Instructions. C. Schroeder, West Webster, N.Y. 44 MILES on 1 gallon—Amazing, new Scientific Gas Saver. All autos. Free Demonstrator. Critchlow, T-120, Wheaton, Iil. DELIVERY bodies for Ford Model T. Chassis with inclosed cab, suitable for Contractors, Grocerymen and Farmers. Three styles. Price $42.60. Write Daniel Zimmerman, Craigville, Indiana. AVIATION AIRPLANES, Motors, aircraft supplies; LeRhone Rotary motor $125; 100 H.P. Gnome Rotary motor $100; 130 H.P. Clerget Rotary Motor $200; Lawrence 28 H.P. motor $100; Curtiss 200 H.P. $300; tan leather helmets $3.75 and $5. Wide-vision goggle $1.75. Nonshatterable goggles:—Oval $3.25, wide- vision $4.50; motometer with 12 ft. tubing $7. breeches $12; airplane cloth 65c yd.; dope compass $10; Aerial camera $100. Logan J 716 W. Superior, Cleveland. LEARN Aviation: Send 25c for large illustrated booklet which tells how. Varney Aircraft Co., Peoria, Ill. THE American School of Aviation announces a new correspondence course in mechanics of aviation. A thorough training in practical aeronautics. American School of Aviation, Dept. 6741, 3601 Michigan Ave., Chicago, Illinois. BOYS get a three foot model aeroplane free. Aero Shop, 3050 Hurlbut Ave., Detroit, Mich. AEROPLANE Motors 383,000.00; complete 165 Horse- power Gnome 9-cylinder engine, weight 292 pounds, air cooled. Immediate delivery $25.00: cash with order F.O.B. Dayton. 1,100 engines purchased from Air Service. Complete planes $500 up. Time payments. Nieuport model. 28 wings complete, $6.00: good con- dition—bargain for plane builders. Motors ideal for ice sleds, snow sleds, motor boats, wind wagons. Write for booklet. Marvin A. Northrop, 200 Builders Exchange, Minneapolis, Minn. MOTORS: Curtiss OXX-6 Class A (under Fifty Hours) for Plane, Sea-Sled, Motor boat, etc., 5.00. All Motor and Plane Spares at Best Prices. Send for Catalogue. Monumental Aircraft Co., 339 N. St. Paul Terrace, Baltimore, Md. AVIATION ‘lturnbuckles. For trueing up sagging gates and doors and many other uses. Large size, ?0 cents. Medium, 25 cents. Small, 20 cents. 3 samples, 65 cents prepaid. Johnson Airplane and Supply Co., Dayton, Ohio. BOATS AND LAUNCHES SPEEDY boat, Ford propelled, easily built. blueprint and directions: sixty cents. Marine cooler booklet free to Ford boat owners. C. C. Hubbell, 4D East Ave., Norwalk, Conn BUILD your own boat:—Newly designed Speedy . V-Bottom Out-Board motor, Runabouts, Cabin Cruisers, etc., 55 models KNOCK-DOWN or patterns. Send 25c for catalog. Brooks Boat Co., Inc., Salt Street, Saginaw West Side, Mich. CONVERT your Ford Motor into dependable marine power plant. Conversion outfit including propeller $75; reverse speed adapter $12.50; watercooled mani- fold $25. All parts for converting powerful airplane motors into marine motors; also converted and uncon- verted motors. Logan Aviation, 716 W. Superior, Cleveland. 80 H.P. 50 gal.; viation, Write to vA) ara | SUCCEED With Your Own Products—Make them yourself. Formulas, Processes, Trade-Secrets. Modern master methods. Catalog free. C. Thaxly Co., Wash- ington, D.C. RESPONSIBLE manufacturer wants competent men to manage office and salesmen. $300 to $1500 necessary; will allow expenses to Trenton if you qualify. Address Manager, 536 Forst Richey Bldg., Trenton, N. J. DISTRICT MANAGERS AND REPRESENTATIVES WANTED WORLD'S fastest selling auto accessory. distributors wanted; write to-day. G. Oiler Co., San Diego, California. _ County L. W., Spring DOGS BEAUTIFUL registered bull pups cheap. Bulldogs. 501 Rockwood, Dallas, Texas. a , _ EDUCATION AND INSTRUCTION USED correspondence school courses save over half. Bargain catalogue 1000 courses free. Used courses bought. Students’ Exchange, Dept. A, 47 West 42d Street, New York. “DOUBLE entry bookkeeping mastered in 60 hours with 8 keys; guaranteed; diploma.”” International Book- keeping Institute, Desk 10, Springfield, Mo. BOOKKEEPING in a week, $2 complete. Dukes, 640 West 153d Street, New York. FOR “‘Free Scholarship”’ (Mail Course) write Carnegie College, Rogers, Ohio. CORRESPONDENCE Courses sold complete: 1-3 usual prices because slightly used; easy terms; money back guarantee. All schools and subjects. Write for special Free catalog. Courses bought for cash. Economy I:ducator Service, 202-N. West 49th St., New York. BECOME Patent Lawyer. Full information. Patent Law, 301 Hennepin Ave., Minneapolis, Minn. CARTOONING and Commercial Art, 25 lessons, 300 Illustrations, 2 clothbound volumes and drawing outfit $5 postpaid. Catalog Free. Nu-Way Art School, 220 Graham Ave., Brooklyn, N. Y. FINANCING AND INVESTMENTS BUSINESS of your own. Clean rugs. Same method I use. Plan and formula $1.00. Good for $10.00 daily. Fink, 1050 Curtis, Toledo, Ohio. WANT more money” Start little Mail Order Busi- ness. Samples and Plan Free. Stamp please, Suydamp, 10748—112th Street, Richmond Hill, New York. FOREIGN Bonds, stocks, drafts and currencies. All nations. Frank G. Everett Co., 35 Wall St., New York. 50,000 MARK German Government Bond, $1.00. 10,000 Austrian Kronen 35c. Write for competition de- fying dealer terms. Arrow Sales, 1748 No. Park Ave., Chicago. PATENTS procured; Trade Marks Registered—A comprehensive, experienced, een service for the pro- tection and development of your ideas. Preliminary advice gladly furnished without charge. Booklet of in- formation and form for disclosing idea free on request. Richard B. Owen, 44 Owen Bldg., Washington, D. C., or 41-Z Park Row, New York. MAKE $80 weekly: experience unnecessary: full or spare time; details free. Winner, Box 615, Philadelphia, a. GOOD Steady profits derived from retinning business. Our process gives best results. Rusted ice cream and milk cans must be retinned. Callender, 2529 W. 48th, Chicago. BIG money made repairing burnt-out Radio Tubes. Instructions 31.00. Duck Mfg. Co., Freeport, Ill. FREE Book. Start little mail order business. Pier, 976 Cortland Street, N. Y. WANTED—Representatives in every factory in the United States. Popular Science Monthly, 250 Fourth Ave., New York. SIGNS and Showcards easily painted with Letter Patterns. Large variety of styles and sizes. Sample for stamp. John Rahn. D 2120 North Neva Ave., Chicago. FORD ACCESSORIES 44 MILES on 1 Gallon—Amazing, new, scientific Gas Saver. All autos. Free Demonstrator. Critchlow, W-120, Wheaton, Ill. ELECTRIC-EXHAUST intake manifolds, for Ford ears, write for illustrated, descriptive circular. F. M. Starbuck, Summersville, W. Va. FORMULAS FORMULAS—ALL KINDS. Catalog Free. Clover Laboratories, Dept. PS, Park Ridge, Illinois. St:LL battery charging solution. Formula $1.00. Frank A. Williams, Mayfield, Calif. FIVE A-1 Concrete Formula Guaranteed. Nationally used, covering waterproof, coloring concrete forms, sidewalks, foundations. Price $1.00 each or five for $3.00. Manning Cement, 309 Fifth Ave., Dept. A, New York. 100 FORMULAS, medicines, cosmetics, toilet prepa- rations, kitchen neccessities, extracts, candies, and insect powders, book of formulas, price $1.00. Any formula you want for the workshop or home 10c each. Mary Hogan, Bokeelia, Fla. DE8C LOCKSMITHING, safe work, taught by mail. C.1. Mitchell. Temple, Tex. SUCCEED—Our twenty scientific process*s put you wise. Excellent. Only 50c. Holland, Box 473, Astoria, Oregon. MAIL Order Booklet, 2c. Where to buy goods. Harvey Teeple, Decatur. Indiana. BE your own b)ss, $100 sufficient worthy remunera- tive business, Dept. R, Paul Kaye, 149 Broadway, New York. EARN $10,000. Be financially independent with fast- est selling auto devices on market. Mashken, Indiana Harbor. Ind. I MADE $30 a week home. years’ experience. Marengo, Ohio. GUARANTEED profits, $10 to $25 weekly. I start youinaspare-time Mail Order Business furnishing every- thing. Write for particulars. Lea, 143 East 23rd St., New York. MIRRORS re-silvered at home. Costs less, 5 cents per square foot; you charge 75 cents. Immense profits, plating like new, brassy worn-off auto parts, reflectors, tableware, stoves, ete. Outfits furnished. Details Free. Sprinkle, Plater, 94, Marion, Indiana. French bread-making, 15 Free booklet tells. Ashbrook, E. 67, ARE you old at forty? See our advertisement on page - 141 of this issue. The Electro Thermal Company, 4057 Main Street. Steubenville, Ohio. SPECIAL Formulas for Manufacturing and Business purposes. Any one you want $5. You must be satisfied or your money will be refunded promptly. National Information Bureau, 316H Shepard Building, Grand Rapids, Michigan. MILLER. “Formula King.” 526 Main, Norfolk, Vit- ginia, supplies any formula. MANUFACTURE Vitamin Foods. Big profits. For- mula one dollar. F. White, Longfellow, Texas. FOR BOYS BOYS, Look. Movie Machines for the family sell as low as $7.50. We carry Western and Comedy Films only. Write now for free catalogue on machines and films. Globe Supply Co.. P. O. Box 2722, Dept. S, Boston, Mass. FOR INVENTORS INVENTOR’S Universal Educator—contains 900 mechanical movements; 50 perpetual motions. Tells how to obtain and sell patents. Suggests new ideas. Explains how to select your attorney and avoid patent sharks. Price (revised edition), $2.00 postpaid. Albert E. Dietrich, 681 Ouray Bldg.. Washington, D. C. UNPATENTED Ideas Can be Sold. I tell you how and help you make the sale. Free particulars (Copy- righted). Write Ww. T. Greene, 805 Jenifer Building, Washington, D. C WANTED—Representatives in every factory in the United States. Popular Science Monthly, 250 Fourth Ave., New York. | CAN You Add” Substantial award for correctly adding dividends of 310 companies. List free, Kerr Co., 40 Monadnock Bullding, San Francisco, Calif. INVENTIONS Commercialized. Patented or ub- mg Write Adam Fisher Mfg. Co., 183 Enright, St- uis, Mo.

Page 125

ing tee May, 1926 FOR INVENTORS “MODE LS Built—Inventions a. Well equip- Experimental shop. Service Tool Works, Inc., ndianapolis. PATENTS: My fee in instalments. ae personal advice. Frank T. luller, Washington, D. GET Your Own ¢ atents. pereetienn, Teal blanks, $1. Cooper Cutting, Campbell, Cali SELL your patented or anna invention. Write for my three plans. Free. Hartley, 44 Central St., Bangor, Maine. INVE NTORS: Get this pamphlet—‘*What to In- vent’. No theory or guess work, but things actually yoked for by manufacturers. Sent prepaid for only $1.00. Inventors’ Syndicate, 23 Paladium Bldg., St. Louis, Mo. INVENTORS—Preliminary investigations only to determine if your inventions are patentable. Neither preparing nor prosecuting applications for patents, I am in a position to give you honest opinions. Com- munications secret. R. Emmitt Patterson, Barrister Bldg., Washington, D. C. FOR MEN AND WOMEN DETECTIVES—Work home or travel. Experience unnecessary. Write, George W a a former Govern- ment Detective, 1968P Broadw ay, N. Y. ARE you old at forty’? See our =n ertisement on page 141 of this issue. The Electro Thermal Company, 4057 Main Street, Steubenville, Ohio. FOR SALE FOR Sale—Stone Age Relics: Axe, Pestle, Celt, Ham- mer, 12 flints, all $5.00. Charles Edwards. Springport, Ind. PURE honey, guaranteed, five pounds, $1.25 F.O.B. Here. Soo Tin, Liberty, N. Y. FOR THE HOME HOT WATER ON TAP, 86. Make your own Auto- matic. Write John Kirkeby, San Luis Obispo, Calif. GRANDFATHER clock works $5.00. Build your own case, instructions free; make good profits selling your friends. Clock works with chimes for old or new cases. Write for full particulars. Clock Co., Nicetown, Penn. TO the man who likes to work with tools, Popular Science Monthly offers the opportunity to purchase blue- ~~ giving details of the construction of useful articles or the home. The following are a few of the blueprints available: No. 1, Sewing Table, No. 5, Kitchen Cabinet, No. 13, Tea Wagon, No. 15, Workshop a No. 7, Cedar and Mahogany Chest, No. 41, One Radio Set, No. 42, Radio Receiver with three cg of ampli- fication, No. 43, Four Tube Radio Receiver. Send 25c for each blueprint that you wish to ie gcd Science Monthly, 242 Fourth Avenue, New York, N. HELP WANTED SILVERING Mirrors, French plate. immense profits. Plans free. Excelsior Springs, Mo. MEN—Start with a starting concern. No get-rich- quick promises—As You Work So Shall You Earn. Kretan Korporation, 9629 Conant Ave., Detroit, Mich. MR. BRUSH SALESMEN-—-Old established New York Brush Manufacturers require the services of men in all territories to sell their extensive line of Sanitary Twisted in Wire Brushes. We pay larger commission than any other Brush House in the country. Write immediately for our proposition. Wire Grip Sanitary Brush Cor- poration, 15 Mercer Street, New York. HELP WANTED INSTRUCTION DETECTIVES Earn Big Money. Excellent oppor- tunity. Travel. Fascinating work. Experience un- hecessary. Write George Wagner, former Government Detective, 1968P, Broadway, N. Y. QUALIFY for $150-—-$300 railroad jobs. Fireman, Brakeman, Baggageman, Sleeping Car or Train Porter. 838 Railway Bureau, East St. Louis, Il COMMENCE $1900 year. Become Railway Mail Clerks. Men 18-35. Common education sufficient with our coaching. Particulars free. Write immediately. Franklin Institute, Dept. R33, Rochester, N. Y. MEN wanting forest ranger, railway mail clerk and other government positions, write for free particulars of examinations. Mokane, Dept. B-30, Denver, Colo. Easily learned; Wear Mirror Works, 31 HOW TO ENTERTAIN PLAYS, musical comedies and revues, minstrel music, blackface skits, vaudeville acts, monologs, dialogs, recitations, enter tainments, musical readings, stage hand- books, make-up goods. Big catalog free. T.S. Denison « Co., 623 So. Wabash, Dept. 26, Chicago. INCORPORATIONS DELAWARE Incorporator, Charters: Fees Small; forms. Chas. G. Guyer, 901 Orange St., Wilmington, Delaware. INFORMATION CORRECT, complete information any scientific, tech- nical,commercial,social topic concerning Brazil furnished. Consulting Engineer Freise, Petropolis, Sampaio 20. Fee 2 Dollars account Banco Hollandez, Rio, Brazil. ACCURATE, specific information on any subject $5. National Information Bureau, 316B Shepard Building, Grand Rapids, Michigan. Prompt service, satisfaction guaranteed. INSECTS WANTED WHY not spend Syne. Summer and Fall gathering butterflies, insects? I buy hundreds of kinds for collec- tions. Some worth $1 to $7 each. Simple outdoor work with my instructions, pictures, price-list. Send 10 cents (not stamps) for my illustrated Prospectus before — ing butterflies. Mr. Sinclair, Dealer in Insects, Dept. 7 Ox 1424, San Diego, Cal. INVENTIONS WANTED WILL buy approved Invention—Write—W. L. Ken- dig, 416 N. Duke Street, Lancaster, Pa. LABORATORY AND CHEMICAL SERVICES YOUR chemical problem solved and working process furnished for $5.00. Write me. W. Stedman Richards, Consulting Chemist, Box 2402, Boston, Mass. MONEY MAKING OPPORTUNITIES SECTION mn | i | r bil fj TT rm or i) "| in [sn IN WANIE FUP in bn ’. UT 0 J UDS i a Yes, sir, nine out of ten men, mechanically inclined, want to cash in on their training and get a good job right away. Sweeney trained men have found the right way, the easy way, to good jobs, secure employ- ment, or of owning their own business. Sweeney Auto Training makes you independent and successful. Just the minute you graduate from the Million Dollar Sweeney School my employment department works to place you where you want to live. nothing else to do but to place Sweeney trained men in fine jobs. This department has Last month we placed graduates at from $35.00 to $50.00 a week in Natchez, Miss. ; Springfield, Mo.; Cape Girardeau, Mo.; South Bend, Ind.; Cheyenne Wells, Colo.; Tyrone, N. Mex.; Hattiesburg, Miss.; Ship- shewan, Ind.; Brookston, Ind.; Marengo, Ia.; and a large number of jobs in Kansas City, Mo., with Hudson-Brace Motor Co., Kelley Rep- pert Motor Co., and various garages and auto agencies. Get the Best Training The Sweeney Auto School offers you the greatest opportunity you ever had. A big reduction in. tuition—a Million Dollar Building—10 stories high—over 12 acres of floor space devoted to the “Sweeney Sys- tem of Practical Instruction’’ under expert instructors. Just across the plaza from the ‘Union Station, short distance from beauti- ful new Two Million Dollar Memorial building. Recreation after work; swimming pool, entertainment, band and orchestra, Radio Broadcasting, Sta. WHB. Remem- ber THERE’S ONLY ONE SWEENEY s ONLY ONE “SWEE- NEY SYSTEM” and you can only get this system at Kansas City, Mo. Learn a Good Trade One that will pay you $200 to $500 a month and more. Get in the biggest business in the world—the Automotive Business. Make more money in 1926 than you ever dreamed possible. I want to prove that you can do what thousands of men just in your posi- tion have done as a result of “SWEENEY TRAINING.” I say, take up the AUTO BUSINESS NOW. Learn it at SWEE- NEY’S—Kansas City, Mo. My FREE Book Tells You— How to run a gar- a chauffeur or truck age anywhere. river. How to learn several How to learn to good trades. repair any make of How totravel and CF see the world. How to weld. How to learn bat- How to fit yourself - for prosperity. teries and auto tires. Shows you hundreds How to get a good of actualphotographs mechanical job. Shows how easy it How to learn to be a CATALOG AND SPECIAL OFFER Get my big FREE 64-page catalog. It shows hundreds of actual photo- graphs of men at work in my magnificent new school. wages, profits, opportunities in auto business. how you learn. Interesting letters from graduates telling how they made good. Shows how men come from all over the w ‘orld to this big school. Makes you want to join the crowd. Tells every- thing you want to know. I will gladly send you a copy beautifully illustrated. I'll tell you how to get into business for yourself. No colored students accepted. E. J. SWEENEY, President LEARN A TRADE= E leg step by step COME RIGHT NOW. If you are mechanically inclined, if you like to work with tools, you will learn under the “Sweeney System,” by actual- ly doing the work, everything a Week about all kinds of automobiles, and up oxy-acetylene welding, vu!- canizing, battery work, elec- trical work, aviation, building and repai ing Radio sets. No experience or education needed. No books are used. You work on most complete gas engine and electrical equipment in any school in the world. Over $200,000 invested. $50,000 Radio Station WHB. You'll get dirty and greasy, but you'll learn by the ‘‘Sweeney System” that fits you for big pay jobs at $50 a week and up, waiting for Sweeney trained men. JOBS PAY $50 Sweeney System of Practical Instruction There’s only one place where you can get this training—it’s at the world-famous Sweeney Automotive and Electrical School of Kansas City. There’s only one Sweeney School. There’s only one “Sweeney Sys- tem.’’ No other school offers or can give you this training that not only trains you to fill big paying jobs but saves you time and money. This training is making big money for 70,000 Sweeney Graduates. I estimate 20,000 of them own a | good pay- gS ing busi- ness, = Tells all about EMORY J. SWEENEY, President 2509 Sweeney Bldg., Kansas City, Mo. Please send me your Free 64-page catalog and special offer. Name pie piaeeaas Age GSS occ ioc ccc cenands seeds bi asaet ates sasesseeuunes Dati os oo tnce teas aeaneuminns Stale. .c caineenee “

Page 126

122 MONEY MAKING OPPORTUNITIES SECTION LABORATORY AND CHEMICAL SERVICES

OFFICE DEVICES May, 19%

PRINTING, ENG. AND MULT.

MELT Metals and Alloys with SPEEDEE-HEET Electric Furnaces, $75.00. The Booth Electric Furnace Co., Room 1122, Monadnock Bldg., Chicago, Il. ADDRESSING machines, multigraph, duplicators, folders, check writers, sealers, dictating machines, at about half new cost. Pruitt, 117 N. Market St., Chicago.

FORMULAS: The Best Chemical Science Can de- vise—Guaranteed Reliable Processes in all lines. Stamp Brings Big Bunch of Valuable Literature, Interesti Lists. Don’t buy till you receive this. Chemi Analysis, Charges reasonable. Dr. Liscomb Miller, Chemist, Tampa, Florida. EXPERIMENTERS. Complete Chemical Apparatus and Radio Catalog. 1000 illustrations. Price Oe: re- funded on $5.00 order. Laboratory Materials Co., 641 East 7Ist St., Chicago. LANGUAGES WORLD-ROMIC System, Masterkey 5,000 languages. Primers $1.98. Chinese, French, Spanish—Languages, 8 West 40th, New York. LETTER SPECIALISTS I WRITE letters, folders, booklets, complete followup for manufacturers, mail order dealers. Long experience. Write for details. L. Taylor, Box S44, Freeport, Ill. LITERARY SPECIALISTS FORCEFUL Literature Prepared. Reasonable Fees. Tell me your problems for free analysis. Worsek, 525a So. Dearborn St., Chicago. ERNEST F. GARDNER, 511-B Ridge Arcade, Kansas City, Mo. Nationally known writer werful, convincing advertisements, letters, circulars, klets. Twenty years’ experience. ‘‘Direct-Mail Advertising” booklet free.

MACHINE TOOLS CONCRETE Building Block Machines and Molds, Catalogue free. Concrete Manufacturing Co., 5 N. Main St., St. Louis, Mo.

MAGIC TRICKS PROHIBITION trick complete, 10c plus 2¢ postage. H. Rogers, Paulina St., W. Somerville, Mass. SPIRIT Writing on Arm 25c; Chemical Slate Trick 25e; Sealed Letter Test 25c; Catalogues Free. Lonergan: Magic Company, 431 North Clark, Chicago. BE a magician, give shows, earn money. Catalogue 20 cents. Oaks Magical Co., Dept. 5&0, Oshkosh, Wis. BOOKS, Magic, Mysteries, Magic Tricks, Novelties. Catalogue Free. Singer 515, Hancock, Wisconsin.

OLD MONEY WANTED $2 TO $500 EACH Paid for Hundreds of Old or Odd Coins. Keep all old money—it may be 7 valuable. Send 10 cents for Illustrated Coin Value Book, 4x6. Guaranteed Prices. Get Posted. We pay cash. Clarke ye Company, Popular Science Department, LeRoy, aN .

PATENT ATTORNEYS

PATENTS—Time counts in ceatine for patents. Don't risk delay in protecting your ideas. Send sketch or model for instructions or write for FREE book, ‘How to Obtain a Patent” and ‘Record of Invention” form. No charge for information on how to proceed. Communica- tions strictly confidential, Prompt, careful, efficient service. Clarence A. O'Brien, Registered Patent Attorney. 184-P Security Bank Building (directly across street. from Patent Office), Washington, D. C. (See page 127) “INVENTOR’S Adviser,” the valuable Patent book with 139 mechanical movements and illustrations, sent free upon request—M. 8S. Labiner, Patent Attorney, 3 Park Row, New York. PATENTS—Before disclosing an invention the in- ventor should write for our blank form *‘Record of Inven- tion.”” This should be signed, witnessed and returned to us together with model or sketch and description of the Invention for Free Inspection and Instructions. Our Three Books mailed free to inventors. Our illustrated Guide Book, “How to Obtain a Patent,’”’ contains full instructions regarding patents. Copies of unsolicited letters from manufacturers and others who are constant- ly writing us regarding the purchase or leasing of merito-

BETTER Printing Business and Professional Sta- tionery. Write us. The Arrow Press, Kankakee, Ilinojg, “Bond Letterheads:—send stamp for samples. M Place, Harding, Mass.” —

ee RAZORS AND BLADES TEMPORARY Offer: GRIPSIT, the Perfect Strop- per for Gillette Blades complete with strop, Genuine Gillette Razor with blade. Complete outfit One Dollar stpaid. Gripset Corporation, 405 Broadway, Cam: ridge, Mass.

SALESMEN AND AGENTS WANTED

AGENTS—Write for free samples. Sell Madison “Better-Made” Shirts for large Manufacturer direct to wearer. No capital or experience required. Many earn — se and bonus. Madison Co., 566 Broadway New York. ‘ AGENTS —Clever invention! | makes every pen a fountain pen. Fast office seller, big profit, demand increasing everywhere. Exclusive territory offered, Sample free. H. Marui Company,Tribune Blg., New York. INSTANT Weld—Repairs large punctures without cement or heat. Lenn’s profit one day $56. Write quick. Free sample. Territory going fast. Tourist’s Pride Mig, Co., Desk R, Minneapolis, Minnesota. MR. ADVERTISER: Ask today for a copy of the “Quick-Action Advertising Rate Folder.” It containg some really important facts which will prove interesting and valuable to you. It also tells “How You Can Use Popular Science Monthly Profitably.”” You'd like to know wouldn't you? Address your inquiry to: Manager Classified Advertising, Popular Science Monthly, 256 Fourth Avenue, New York.

rious patents sent upon request. See adverti t on ae rs Victor J. Evans & Co., 937 Ninth, Washing- ton, D. C. PATENTS, trade marks, copyrights. Prompt, per- sonal reliable service. Over 30 years’ active practice. Write for terms. Book free. Address E. G. Siggers, Box 1, N. U. Building, Washington, D. C. PATENTS. Booklet free. Highest references. Best results. Promptness assured. Watson E. Coleman, Patent Lawyer, 644 G Street, Washington, D. C. INVENTORS’ Guide free on request; gives valuable information and advice for all who have original ideas or improvements. Frank Lederman, Registered Attorney and Engineer, Woolworth Bldg., 1714, New York.

MAIL ORDER BUSINESS 25000. I MADE spare time home. Booklet for stamp. Sample and Plan 25¢. Alps Scott, Cohoes, N. Y. MAKE Money on the Side. A brand new proposition. No capital required. Splendid mail-order feature eve- nings. Dept. S, Klean-A-Pipe Company, Fargo, N. Dak. MANUFACTURING

UNPATENTED Ideas Can Be Sold. I tell you how and help you make the sale. Free particulars (Copy- righted). Write W. T. Greene, 811 Jenifer Building, Washington, D. C. MILLIONS spent annually for ideas! Hundreds now wanted! Patent yours and profit! Write today for free book—tells how to protect yourself, how to invent, ideas wanted! how we help you sell, etc. American Indus- tries, Inc., 501 Kresge Bldg., Washington, D. C.

GET our free sample case toilet articles, perfumes and specialties. Wonderfully profitable. La Derma Co., Dept. F., St. Louis, Missouri. WASH Clothes the new way. Use the Torrent Auto- matic Washer. You will be delighted. Special offer to one in each locality. Storm Royalty Co., 3614 Enright Ave., St. Louis, Mo. AGENTS. $60—$200 a week. Genuine gold letters for store windows easily applied. Free samples. Liberal offer to general agents. Metallic Letter Co., 434-A. N. Clark, Chicago. GET our plan for monogramming automobiles, trucks, hand luggage and all similar articles by transfer method, experience unnecessary; exceptional profits. Motorists’ Accessories Company, Mansfield, Ohio. MR. ADVERTISER: Ask today for a copy of the “Quick-Action Advertising Rate Folder.” It contains some really important facts which will prove interesting and valuable to you. It also tells ‘“‘How You Can Use Popular Science Monthly Profitably.”” You'd like to know, wouldn't you? Address your inquiry to: Manager, Clas- sified Advertising, Popular Science Monthly, 250 Fourth Avenue, New York.

DEVELOPING ideas and manufacturing our spe- cialty. Absolute satisfaction, 33 years’ experience; write us. The K. & B. Die & Specialty Co., 2018 Elm St., Cincinnati, Ohio, Dept. C.

PATENTS, Trade-Marks, aii countries. Ten years’ experience examining applications in Patent Office. Consultation invited. George Beeler, Patent Attorney, 150 Nassau Street, New York.

MISCELLANEOUS 31,000 LETTER. Opportunity calls. booklet free. Limited edition. Ave., Alton, New Hampshire. VEHICLE control for cripples. Approved device. Makes driving safe and pleasant. Price reasonable. Simple and effective. Write Alvin Colanduan, R.F.D. No. 2, Union Ave., Somerville, N. J. MINERAL treasure under foot. Fortunes in com- mon minerals. List Minerals identified $1.00. Mineral specimens. Buskett, Geologist. Joplin, Mo. ARE you old at forty? See our advertisement on page 141 of this issue. The Electro Thermal Company, 4057 Main Street, Steubenville, Ohio. MODELS AND MODEL SUPPLIES

Informative FEMCO, 7 Mitchell

PATENTS: My fee in installments. Free personal advice. Frank T. Fuller, Washington, D. C. MONROE E. MILLER, Ouray Bldg., Washington, D. C., Patent Lawyer, Mechanical, Electrical Expert. Book- let and Priority Record blank gratis. PATENTS—Send for form ‘‘Evidence of Conception” to be signed and witnessed. Form, fee schedule, informa- tion free. Lancaster and Allwine, Registered Patent Attorneys in United States and Canada, 232 Ouray Bldg., Washington, D. C. _ PATENTS Procured: Trade Marks Registered.—A comprehensive, experienced, pone service for the pro- tection and development of your ideas. Preliminary advice gladly furnished without charge. Booklet of in- formation and form for disclosing idea free on request. Richard B. Owen, 44 Owen Bldg., Washington, D. C.,or 41-Z Park Row, New York.

WE make working models for inventors and experi- mental work, and carry a complete stock of brass gears and model supplies. Send for catalogue. The Pierce Model Works, Tinley Park, Illinois. HULIT & CO., 625 Jackson, Chicago, Ill. Experi- mental Machinists. Model Makers, Dies. Patterns. Complete general Machine shoo. “SPECIAL machine builders, tool and die makers, inventor's models, production work of all kinds. Dept. J, Quality Hardware & Machine Co., Ravenswood and Thcrndale Avenues, Chicago. II.” WE Build Models, design, develop and manufacture articles in large or small quantities. Hohmeier Mfg. Co., 1385 E. 17th St., Cleveland, O. MOTORCYCLES, BICYCLES, SUPPLIES

RICHARD E. Babcock, Patent Lawyer, Washington Loan & Trust Bldg., Washington, D. C. Established 1877. Booklet. PATENTS. As one of the oldest patent firms in America 7 inventors at lowest consistent charge, a service noted for results, evidenced by many well known Patents of extraordinary value. Book, Patent-Sense, free. Lacey & Lacey, 648 F St., Wash., D.C. Estab. 1869. PATENTS, Trade-Marks, Copyrights. Easy terms. Sanders, 2 Rand MeNally Building, Chicago, I]. PENMANSHIP I GUARANTEE my handwritten lessons will make you an expert penman. Full particulars and addresses of many graduates free. Send quarter for your signature twelve styles on cards. Meub, 2365 Mar Vista, Pasa- dena, California.

OVERSTOCKED Used Motorcycles, 1923 Indian Chief, $95.00, 1923 Harley Davidson, $95.00, 1923 Henderson Deluxe, $120.00. Twe hundred others, write for free list. Myerow Brothers Co., 14 Berkeley St., Boston, Mass. DON’T buy a bicycle motor attachment until you get our catalogue and prices. Shaw Mfg. Co., Dept. 4 Galesburg. Kansas. MOTORS—ENGINES— MACHINERY BRAND new 1 KW Westinghouse. 32 volt, 1,150 speed, light and power Generators at $48.00 each. 25% cash, balance C.0.D. General Distributing Co., Security Storage Bldg., Duluth, Minn. SLIGHTLY used 4% Horse 110 V. 3450 speed Westing- house alternating motors $16.00. New 4% Horse West- inghouse motors at less than second hand prices. 32 V. 1750 Speed washing machine motors with pulleys $7.00. Lots of eight $6.50. Also other bargains. Queen City Electric Co., 1742 Grand Av., Chicago, Ill. MUSICAL PIANO JAZZ: teaches Ear Playing, Negro Harmony, Flayer Piano Effects, Chimes, Blues, Chords, Sweet Harmony, Particulars Write “Piano Bill,’’ Toronto 3, Canada. RENT a New Band Instrument. Any kind. Pay while you learn. Rental applies on purchase price. Free cata- logue. VERNON GALSTER.,. Box H 21, Morris, Ill. OPTICAL GOODS ARTIFICIAL eyes.

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PERSONAL YOUR Handwriting Reveals Your Character. Send 25 cents (silver) and ink sample of own or friend's writing for expert analysis and astounding demonstration of dominant characteristics. Real guide to success. R. Pencraft, Hamburg. New York. PHOTOGRAPHY AND SUPPLIES HAVE youacamera? Write for free sample of our big magazine, showing how to make better pictures and earn money. American Photography, 117 Camera House, Boston, 17, Massachusetts. ESTABLISH yourself at home, as a photographic expert; make $75 a week while learning; professional camera furnished free; write quick for full information. International Studios, Dept. 1743, 3601 Michigan Ave., Chicago. UNEXCELLED Gloss Prints. Trial Offer. Your Kodak Film Developed and Printed only 10c. F. R. B. a , Dept. ‘’G,"’ 1503 Lincoln Ave., Cincinnati, 0.

THREE 5x7 Enlargements one _ dollar. Prompt Service. F. Doane. Merrill Bldg., Milwaukee, Wis. PRINTING AND ENGRAVING EMBOSS your Stationery with Hand Embosser. Circular Free. Midwest, Box 47, Springfield, Illinois. HIGH Grade Printing —5,000 20-lb. Hammermill Bond Letter Heads, $13.75; 10,000, $24.00. 6%4 white wove envelopes, one thousand, $2.25. The Courier Company, Zanesville, Ohio.

TAKE orders for coffee, sugar, flour, meats, canned goods, staple groceries, also paints, radio sets, tires, auto and tractor oils. No capital or bond required. We deliver and collect. Permanent business. Big pay. Write at once. Hitchcock-Hill Co., Dept. 81. Chicago. BANKRUPT and Run‘nage Sales. Make $50.00 daily. We start you, furnishing everything. Distributors Dept. 34, 609 Division, Chicago. AGENTS —Steady incone. Large manufacturer of handkerchiefs and dress goods, etc., wishes representative in each locality. Factory toconsumer. Big profits, honest goods. Credit given. Send ~~ < 7am Freeport Mfg. Co., 24 Main St., Brooklyn, N. Y. $10 DAILY silvering mirrors, plating and refinishing lamps, reflectors, autos, s, chandeliers by new method. Outfits furnished. Write Gunmetal Co., Ave. F, Decatur, Illinois. SELLS for $9.75. Prints ad on wrapping paper, envelopes, etc. $4.00 commission. Send 10c for sample work. Automatic Ad-Stamper, Joplin, Mo. FREE Booklet describes 52 plans for making $20.00 to $100.00 weekly in home or office business of your own. Downs Co., 2332 Myrtle, St. Paul, Minn. A BUSINESS of your own. Make and sell chipped glass name and house number plates, checkerboards, signs. Booklet FREE, E. Palmer, Dept.513, Wooster,Ohio. REPLATE brassy worn-off automobile parts. Re- flectors. Bathroom fixtures, worn spoons, forks, etc., with pure silver. Look like new. Use U-Kan-Plate Polish. Positively no mercury. $1.00 half pint. Post- aid. Satisfaction guaranteed. Agents wanted. -Kan-Plate Co., Dept. B. Philadelphia. AGENTS—Best seller; Jem Rubber Repair for tires and tubes; supersedes vulcanization at a saving of over 800 per cent; put it on cold, it vulcanizes itself in two minutes, and is guaranteed to last the life of the tire or tube; sells to every auto owner and accessory dealer. For particulars how to make big money and free sample, ad- dress Amazon Rubber Co., 504 Amazon Building, Phila- delphia, Pennsylvania. WE pay $48 a week, furnish auto and expenses to introduce our Soap and Washing Powder. Buss-Beach Company, Dept. A48, Chippewa Falls, Wisc. SALESMEN—Selling Supreme Shirts means big business, big repeats! big commissions. Write today for FREE Kit. Supreme Shirt Co., 276-F Fifth Ave., New York. WONDERFUL New Pricing System sells instantly to all stores. Big repeats! Tremendous market. Write quick. Exclusive territory. Millen, 414 Nottingham Bldg., Boston, Mass. AGENTS—New guaranteed invention, needed homes, restaurants, etc. Big profits. 30-second demonstration sells it. Sample Free. Exclusive territory. Conaway Co., M-37, Champaign, Illinois. NEW camera takes and finishes photos in one minute. Make money selling cameras or taking photos. eve territory. Crown Co., Dept. 314, Norwalk, Sonn. BIG pay to agents selling Mother Hubbard food specialties and extensive line of other rapid repeaters. Mother Hubbard Co., 558 Congress, Chicago. SELL guaranteed shirts, overalls, and work pants. Big variety of shirts, including silks, with a splendid line of union made work and flannel shirts, overalls, coveralls, work pants, play suits, all ponrensese. Sell direct to wearer full or spare time. No experience re- quired. Write today for FREE Selling Outfit, Nimrod Shirt Co., Dept. 25, 4922—24—26-28 Lincoln Ave. Chicago.

BETTER Printing for Less Money. Write us about your printing needs, and you will save money. Ernest Fantus Company, 525 South Dearborn Street, Chicago.

ONE CENT!! Post Card from You Brings free solid gold stud offer to Agents. Rajah Rainbow Gem Deceives experts. Rainbow Gem Co., Dept. I-10, Salisbury, N. C.

Twisted han any immedia Brush C Sass tied nod distribu No capit 44 M Gas Sar $-120, 1 ICEL tion. E half. Ie Indians MR. “Quick some Tr and va Popula know, ' Classif Fourth AGI sells € Dayto WE proces mous Co., 6

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Pt is, on U TraervTi of er. 28a eR eet Beet ets © tel oS a May; 1926 SALESMEN AND AGENTS WANTED “TIGHTNING Electrolyte. Charges storage batteries jnstantly. Guaranteed not to injure battery. Gallon ts OC, sells $10.00. Chance to clean up fortune sellin to garages and agents. Make it yourself. Guarante foumula $5.00. Write for free circulars. Murphy, Chemist, Tujunga, Calif., Box K MR. BRUSH SALESMEN—Old Established New york Brush Manufacturers require the services of men jn all territories to sell their extensive line of Sanitary qwisted in Wire Brushes. We pay larger commission than any other Brush House in the country. Write immediately for our proposition. Wire Grip Sanitary prush Corporation, 15 Mercer Street, New York. NO dull times selling food. People must eat. Federal distributors make big money; $3,000 yearly and up. No capital or experience needed; guaranteed sales: unso d goods may be returned. We furnish you with license. Your $20.00 starting order sent on trust. FREE SAMPLES to customers. Repeat orders sure; Exclusive territory. Ask now! Federal Pure Food Co., L-2311 Archer, Chicago. SUCCEED With Your Own Products—Make them yourself, Formulas, Processes, Trade-Secrets. Modern master methods. Catalog free. C. Thaxly Co., Washing- ton, D. C. 44 MILES on 1 Gallon—Amazing, new, Gas Saver. All autos. Free demonstrator. -120, Wheaton, Il. ICELESS Ice Cream Shipper. Amazing new inven- tion. Eliminates ice, salt, weight and cuts express costs half. Teeless Container, St. Paul, Minn. $20 DAILY selling VER-I-EZY Men's shoes direct. Sell relatives, friends, neighbors first. Low priced. Give real comfort, long service. You take orders, keep big commission. We ship and collect. Full or part time. Write NOW. Easy-wear Shoe Company, Dept. 233, Indianapolis, Ind. MR. ADVERTISER: Ask today for a copy of the “Quick-Action Advertising Rate Folder.” It contains some really important facts which will prove interesting and valuable to you. It also tells “‘How You Can Use Popular Science Monthly Profitably.””. You'd like to know, wouldn’t you? Address your inquiry to: Manager, Classified Advertising, Popular Science Monthly, 250 Fourth Ave., New York. AGENTS WANTED—Something new—Fyr-Fyter sells easily. Makes a spectacular demonstration; car owners, homes, factories, stores, practically buy on sight. Our men make $10 to $50 a day. Exclusive territory to producers. If you wish to establish a business of your own With unlimited possibilities for making big money, write us today. Fyr-Fyter Co., 999 Fyr-Fyter Bldg., Dayton, Ohio. WE start you in business. Chemicals, formulas, processes furnished. Every home a prospect. Enor- mous profits. Information free. Twin City Chemical Co., 65 12th St., St. Paul, Minn. LIGHTNING storage battery compound. Charges discharged batteries instantly. Eliminates old method. entirely. Gallon free to agents. Lightning Co., St. Paul, Minn. ACTIVE men and women wanted as distributors and sales managers. Exclusive territorial rights. Pays 150 to 250 per cent profit. Darn E-Z Laboratories, Department P.S., Dayton, Ohio. NEW wonderful seller. $1.40 profit every $1.50 sale; monograming automobiles; Wilbar made $29.50 first day. Free Samples. Worcester Monogram Co., 126, Worcester, Mass. $20 PROFIT daily selling needlebooks; costs 3-5c each; sells 25c; value 50c. Three samples 25c. Catalogue i Needlebook Specialty Co., 661 Broadway, New ork. SELL BY MAIL! Big Profits! Novelties, Bargains. Particulars Free! Dearborn Street, Chicago. MR. ADVERTISER: Ask today for a copy of the “Quick-Action Advertising Rate Folder.” It contains some really important facts which will prove interesting and valuable to you. It also tells “‘“How You Can Use Popular Science Monthly Profitably.’’ You'd like to know wouldn't you? Manager, Classified Advertising, Popular Science Monthly, 250 Fourth Avenue, New York. BIG money and fast_sales. Every owner buys gold initials for his auto. You charge $1.50; make $1.35. Ten orders daily easy. Write for particulars and free samples. American Monogram Co., Dept. 47, Fast Orange, New Jersey. _BRING Home the Bacon selling Stuart's famous Food Flavors. Quick sellers. Big profits. Write for free sample and terms. C. H. Stuart & Co., 6568 Main, Newark, New York. MONEY MAKERS—2004 profit selling Aut-O-Pep tablets. Guaranteed to Save Gas, Remove Carbon, Increase Power and Mileage. Results wonderful. Taylor Products Co., 22 W.. Naghtox, Columbus, Ohic. SALESMAN for largest Eastern Tailoring House Superior line factory to wearer. $29.50 up. Extra trousers free. Large commissions. Complete outfit NX. E. Wholesale Tailors, Harrison Ave., Boston, Mass 300% PROFIT. Quick Seller: Fast Repeater. Sam- S Free. ‘‘Bestever’’ Products, 1946-N, Irving Park, cago. Scientific Critchlow, Books, Formulas, Elfeo, 523 South AGENTS—Stamping names on Pocket Key Pro- tectors; sample check with your name and address, 25c. Stamping Outfits, Emblem Checks, Check Fobs, Name Plates. Hart Mfg. Co., Desk 2—305 Degraw St., Brooklyn, N. Y. PORTRAIT men, let us tell you why our bromide prints and service are the best, prices are low now too. United Print Co., 2539 S. State, Chicago, U1. AGENTS wanted to mail circulars. g00ds. New methods. Big profits. Peerless Service, Waterville, Maine. G IMPORTED 5-Color Pencil, Writes Red, Black, Blue, sreen, indelible. Sells on sight: No competition. Sample $1.00. Aronson, K-236 W. 55th St., New York. a AGENTS—90¢ an hour to advertise and distribute ee to consumer. Write quick for territory and itt culars, American Products Co., 5790 American g., Cincinnati, Ohio. WAGENTS: 20 lines in one; $20.00 daily: sell men, omen, children, Shirts, topcoats, raincoats, lingerie, sell oe dress goods, shoes, blankets, rugs, ete. Under- t Stores. We deliver. Elaborate outfit free. Guaran- fed Products Co., 509 So. Franklin, Dept. 24, Chicago. ton PAYING Position Open to representative of charac- fis Take orders shoes-hosiery direct to wearer. Good teome. Permanent. Write now. Tanners Shoe Mfg. Fast selling Particulars free. MONEY MAKING OPPORTUNITIES SECTION will make this contract with you: When you enroll for our home-training in Draft- ing, we agree to give you: 1. Complete Drafting training, by the new Prac- tice-Method. 2. Professional Drafting Outfit, as illustrated. 3. We will help you gct a good Drafting position at a substantial increase in pay. 4, Or we'll refund every cent of your money. (ERY &> “ip ae) O ne, saieeete all The American School, a million dollar Vo- Profit Educational Institution now offers men a double service—training for a spe cific job, then finding the job. For one small price, on terms of only $5 a month, you are now assured of definite benefits, both in position and salary. Coupon brings complete \ details of this FA. sensational offer! >» in Machine tural Draft enough mer must know how to ca position that pays Job Service’ Free to Students and Graduates: .TB® Awentcan CHOOL now ofiers its students and graduates, without co-t, the services of an efficient Employment Depart- ment which keeps in touch with the employ- ers of Draftsmen all over the United States. We have placed hundreds of men in good Drafting positions, We have made this train- ing so complete, so practical, so easy to mas ter, that our students are bound to make cluding board, students. employers, students, graduates, Chief Drafting Ergineer Co. 3-41 2 C. St., Boston, Mass. American Schoo ih 4? to prove youcanlearnathomeinsparetime! We have invented a new, simplified way to teach Drafting—the first real improvement HIGHWAYS TO SUCCESS! The big money in Drafting goes to men who specialize You need many Engineering subjects to fill the kind of a Drafting Mp, $125 a week. The Amer- ican School now in- cludes this special- ized trainingin its Drafting course. Professional Outfit Given Fine, imported in- struments help you Jearn Drafting easily and quickly. These standard quality, full size instruments, in- triangles, T-square, ink,protractor,etc, given without ex- tra charge to good, And, so, because the demand for real Draftsmen continues to ex-@ ceed the supply and because this training actually prepares men for good - Drafting positions, we back it with @ Free Employment Service, free to BE 8 _ Drexel Ave. and 58th St. 8 oy State. Dept. D-575 Chicago, Ill, @ 123 in Drafting home-instruction in history. We want you to see it, try it—without one penny of cost or obligation. We want to show you how we get away from the copy- ang methods used in the past. See how we make you think, solve problems, do actual drafting room jobs from the first lesson? Draftsmen WANTED! 70,000 fine jobs advertised this year, many at $60 to $125 a week. Get ready to fill one,. Get out of the rut. Make something of yourself. Plan your future in Drafting. Even if you have only common schooling, even if you know nothing of Drafting, we guarantee to make you a real Draftsman or to refund your money! Special surprise offer right now to the first 500 men who answer this ad—reduced price, easy terms, Coupon brings complete information, A new, rapid, simplified way This new “Job-Method” gives you actual drafting-room jobs in a new one-step-at-a- time way. With pictures which you can un- derstand almost without reading the “les- sons.” And that is why American School- trained Draftsmen can qualify for a good job at big pay when they graduate, Design, or Electrical Drafting, or Architec- ing, or Structural, or Automotive. It isn’t ely to know general Drafting practice. You Iculate and design and plan original work. $60 to COUPON Brings 3 Lessons Free Get them. Test your own ability to learn Draiting and get ready for a fine job and big pay. Cou- pon also brings surprise offer, and complete information about your opportunities for success in Drait- ing. MAIL JT TODAY! time o Jee SD Oe Chief Drafting Engineer AMERICAN SCHOOL @ dept. 0-575 | Drexel Ave. & 68th St., Chicago Rush 8 Free Drafting Lessons, surprise offer, complete in- formation, money-back guarantee, etc., to prove I can become a real Draftsman at home in spare time, table,

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This sweep- ing written guarantee solves your blade problem for all time. I Razor mean every word when I say “‘I’ll F R E E ! keep you in Razor Blades for Life.” Write for Details At Once! This astonishing offer is limited. Send for infor- mation on amazing Kriss-Kross inventions today. They are never sold in stores—and they’re even more remarkable than I can tell you here. Clip the coupon today. No obligation. AGENTS Make big money as a Kriss-Kross ative. $75-$200 a week. Free gift razor is mar- velous business booster. We have a unique sales plan that brings you extra profits while you sleep. K. D. Ralph made $612 in 30 days. H. King took in $66 one day. Spare-time workers, office and factory men make $5-$10 extra a day just showing Kriss-Kross to friends. Send coupon for details. Check bottom line and mail at once! Dept. E-240 RHODES MFG. CO. 352 Mo. 2 8 8 2 8 8 EB SO ER OE OS UO OE OR GR OR UU UG UR UG GT Rhodes Mfg. Co.. Dept. E-240. Pendleton & Cozens Ave., St Louis, Mo. Please send me without obligation details of your offer to keep me in Razor Blades for life. Also full description of free razor and stropper. Name Address ee ee City POR Pr ee Seeu wee eee eee eS eB ee eee ee eee Ss For 30 days ect Mystery represent- MONEY MAKING OPPORTUNITIES SECTION SALESMEN AND AGENTS WANTED May, 19% SALESMEN AND AGENTS WANTED DON'T sell for others. Employ agents yourself. Make your own products. Formulas, toilet prepara- tions, perfumes, extracts. 500% profit. Write for our big free catalog which explains everything. National = _— Laboratories, 1942W Broad, Richmond, Vir- ginia. YOUR trade uses salesboards. Make up to $35 on single sale. Largest, lowest priced line. No samples to carry. Elaborate 3 color catalog free. Lincoln Sales Co., Dept. G, 9 So. Clinton, Chicago. DISTRIBUTORS wanted for Mystifying Radio Gas Lighters and Masterlite Cigar Lighters. Everybody interested. Sell to consumers, dealers. Big profits, steady business. Selling Plans free. L. Masterlite Co., 110 E. 23rd St., New York. MAKE Money, silvering mirrors, refinishing auto headlights, tableware; metal plating, bed steads, chan- ueliers. Outfits furnished. International Laboratories, Dept. 64, 309 Fifth Ave., New York. AGENTS—Make a dollar an hour. Sell Mendets, a see patch for instantly mending leaks in all utensils. ample package free. Collette Mfg. Co., Dept. 467 Amsterdam, N. Y. MIRRORS re-silvered at home. Costs less than 5¢ owed square foot; you charge 75c. . Immense profits, plat. ng like new, brassy worn-off auto parts, reflectors, table. ware, stoves, ete. Outfits furnished. Details FREE Sprinkle, Plater, 96, Marion, Indiana. . SALESMEN-—Sell new “blash” Fire Extinguishers Men wanted everywhere. Make $600.00 per month; Improved extinguisher operates like flashlight. Retails $7.50 to $12.00. Large commissions. Developed by United States Government Air Service. Stock equi ment now on Government airplanes. Be first in field with this new invention. Full or part time. No experj- ence necessary. Write quick. Automatic Fire Extin. guisher Co., Desk A-5, 219 S. Ludlow, Dayton, Ohio. AUTO Accessory Distributor-Saltesman Radiator Ce ment. $2.40 dozen. John Letendre, New Bedford, Mass, AGENTS coining money selling ““LANOWA" Prod. ucts. Greatest utilities known. Big demand everywhere, Write quick for sample. Fraser Products, 305-1. 48rd, Kansas City, Mo. IT’S the season's biggest selling hit. very car owner and garage will buy auto Mitten Dusters. 200% profit. Sample given. National Fibre Broom Co., St. Louis, Mo, EARN $10 daily silvering mirrors, plating and re- finishing metal ware, headlights, chande jers, bedsteads. Outfits furnished. F. Decie Laboratories, 1133 Broad- way, New York. MR. ADVERTISER: Ask today for a copy of the “Quick-Action Advertising Rate Folder."’ It contains some really important facts which will prove interesting and valuable to you. It also tells ‘‘How You Can Use Popular Science Monthly Profitably."". You'd like to know, wouldn't you? Address your inquiry to: Manager, Classified Advertising, Popular Science Monthly, 250 Fourth Avenue, New York. MAGIC Polishing Cloth—Great seller. Big Profit. Free sample to workers. Get this proposition. Newton Co., 107 Main St., Newark, New York. BIG MONEY, fast sales; every owner buys gold initials for his auto. You charge $1.50, make $1.44. Ten orders daily —, Samples free. World Monogram, Dept. 25, Newark, N. TAILORING _ salesmen. order union label suits, overcoats. Special! Suit or overcoat $24.50. Extra trouscrs free! Commissions $4-$8 every sal>. Big sales outfit free. Scott System QW Washington St., Boston, Mass. MR. ADVERTISER: Ask today for a copy of the “Quick-Action Advertising Rate Folder.’’ It contains some really important facts which will prove interesting and valuable to you. It also tells ‘‘How You Can Use Popular Science Monthly Profitably.”” You'd like to know, wouldn't you? Address your inquiry to Manager, Classified Advertising, Popular Science Monthly, 250 Fourth Ave., New York. SELLING Like Blazes. Eleven picce toilet goods assortment at $2.00 with two piece carving sct FREE to your customers, 100% profit. Davis Products Co., Dept. 57, 1321 Carroll, Chicago, Ill. OVER 100% Profit, Self-Lighting Gas and Cigar Lighters: Everybody interested; repeat business. Sell individuals, dealers, subagents. Particulars FREE. S. M. Bernhardt, 127 West 30th St., New York. “AGENTS’ and Mail Dealers’ Guide” and large im- print catalogue free. Pruitt Pub. Co., Station E-8, Kansas City, Mo. Largest line made to AGENTS, I'll pay you $240 month taking orders for New Guaranteed Hosiery. Biggest, best, most beautiful line offered. Pay you daily in advance. Extra bonus besides. New plan puts you above competition. No ex- rience needed. Credit given. Samples furnished, Write for amazing offer. Jennings Hosiery Co., Dept. 632, Dayton, Ohio. IF I SEND YOU Shoes made-to-your measure in any one of 69 leathers, 50 different styles, will you keep them, wear them, show them to your friends as sample of my $10 Made-to-Order shoes to sell at $6.85? Advise me today. Your sample out fit will go forward absolutely free at once. Dept. 9025. Forrest Dustin, 932 Wright- wood Ave., Chicago. STARTLING Selling Plan! $1.25 premium free to every customer on $2.00 sale of 8 ounce Vanilla, 6 ounce Shampoo and 4 ounce Lemon Lotion. Details and samples free. C. I. Togstad, Dept. 19G, 29 South Clinton, Chicago, Illinois. SELL fine made-to-order all wool suits at $31.50. Regular $55 values. Over 100 6x9 cloth samples, all one price. Furnished. Hustlers earn $100 weekly. Write W. Z. Gibson, Inc., 161 W. Harrison St., Dept. S-626, Chi- cago, Ill. POLMET POLISHING CLOTH cleans all metal. Sells fast at 25c. Sample free. F. C. Gale, 15 Idinboro St., Boston. SALESMAN for largest New England House. Suits, topcoats $23.50 factory to wearer. Largest commissions. Possibilities $5000 up. Boston Wholesale Clothing, 7 Beach, Boston. $95.00 A WEEK for agents! Take orders for charming Val-Style hats, sold direct. No competition. Latest Paris models, guaranteed. Low prices. Big commissions daily. Selling equipment FREE. Val-Style Hat Co., Desk 55, Cincinnati, O. AGENTS work at home. vestment. Large profits. Service, Elizabeth, N. J. $20.00 A DAY selling Felt Rugs. Vernon, Ohio. Spare time. Nominal in- Interstate Commercial C. P. Dotson, Mt. STAMMERING MARVELOUS Invention! Does away with phono- graph needles. Preserves records. Saves $25 in needles. Pays $99 weekly. Sample on approval if requested. Everplay, Desk G-5, McClurg Bldg., Chicago. NEWEST Invention: Sells everywhere. Automati- cally prevents telephone and iron cords from tangling and kinking. $90 weekly. Samples for test if desired. Neverknot, Dept. J-5, McClurg Bldg., Chicago. IF YOU think in Ternts of $6,00C the First Year write Us Now. Strong line for retail stores. Nationally ad- vertised. Established concern. Best season now start- ing. Liberal weekly advance to producer. The Conti- nental Co., 1317 Liberty Bldg., Cleveland, Ohio. AGENTS—Send for sworn proof of $5 to $15 daily, introducing New Style Guaranteed Hosiery. 57 styles, 40 colors. Nc capital or experience required. Just write orders. We deliver and collect. YOUR PAY DAILY, also monthly bonus. Free auto offer besides. We supply saioples. All colors, grades including silks. Macochee Textile Company, Card 1525, Cincinnati, Ohio SALES Agents—Take orders High Grade Tailored Neckwear. Guaranteed for 6 months. Insured never to roll, twist, stretch or bunch. Not sold in stores. Write for beautiful line samples. Better-Made Cravat Co., Wholesale Dept. 7, Columbus, Ohio. AGENTS make $57 a day driving nails in tires! Amazing discovery heals all punctures—one tire was punctured 357 times without a leak. Send for Free Sample Offer. O. S. Nelson, E-3026 Logan Bldg., Mitchell, S. Dak. CAN you sell Ford size tires at $3.50 each? Write for plan. Details free. American Accessories Co., Dept. 179, Cincinnati, Ohio. OH HELLO. Why didn’t I see this before. Christy’s Iron Rust and Stain Remover sells like blazes. Write for free sample and terms. A. N. Christy & Co., 5068 Union, Newark, New York. a SELL Greeting Cards, 35 Commission. Informa- tion free. Wolfeprint, Lawndale, Philadelphia. WE want men and women as local representatives to sell our nationally known Nustile hosiery and lingerie. Full or spare time. Experience unnecessary. Earnings large. Write for details. The Nustile Company, Dept. 4-4, Philadelphia. FORMULAS for making y: ur own guaranteed prod- ucts. Investment Small. No Machinery Needed. 300 to 12008 profit! Stamp Brings Interesting Descriptive Literature for Fly Killing Spray, Delicious Summer Drinks, Best Metal Polishing Cloth, Hair Marcell Liquid, No-Water Hand Soap, Lightning Battery Charg- ing Liquid, Mendit, Fabric Patching Liquid; Amazon Tire Repair, Washing Compounds; Compolith Wood- stone, Wonder Gloss; Wizard Polish; Pure Food; Toilet, Medical, Household Specialties, All lines. State what interests most. Miller, Chemist, 1706 Jettony, Tam- pa, Florida. ST-TUT-T-T-TERING and stammering cured at home. Instructive booklet free. Walter McDonnell, 59 Arcade, 1126 Granville Avenue, Chicago, Ill. STAMPS AND COINS 1000 DIFFERENT stamps only 75c; from Armenia, Iceland, Zanzibar, ete., to approval applicants only. Bargain lists free. Victoria Stamp Co., London, Canada. CALLFORNIA gold 8% size, 21¢.; 84% size, 53e. White cent and catalogue, 10c. Norman Schultz, Colorado Springs, Colorado. STAMPS, 100. All different, 3 cents. P. S. Quaker Stamp Co., Toledo. Ohio. OLD Coins. Large Spring Selling catalogue of coins for sale free. Catalogue quoting prices paid for coins, ten cents. William Hesslein, 101B Tremont Street, Boston, Mass. 1,000 MIXED U. 8S. and Foreign Stamps 25c. Phil Lundsted. Cape Cottage, Maine. STAMPS Free—Ask for money-saving John K. Borresen, Cedar Falls, Iowa. FOREIGN Stamp collection sent free. Cornish Company. Schenectady, N. Y. OLD Coins and Stamrs wanted. Buying list free. Stamp & Coin Collector, tells about stamps and coirs. 6 months 25c. Kraus, 409 Chestnut, Milwaukee, Wis. GUARANTEED! The greatest bargains ever offered collectors in largest illustrated price list ever issued, 4c. Penna. Stamp Co., Manor, Pa. HINGES. 1000 perfcct perlable hinges 5¢ only to real applicants for approval sheets. Confederate $1 Bill with above if you pay postage. Tell your friends. R. Pettet, 690 S. Boulevard, Atianta, Ga. 109 DIFFERENT Includirg set ‘War Prisoners,” Lists free. approvals. Bulgaria and Turkey Picture Stamps, 10 cents. Sonnee Stamp Company, 675 Ivy, St. Paul, Minn. ZANZIBAR, Abyssinia, Travancore, Herzegovina, Mozambique, Quelimane stamps, menagerie collection, album, 10¢. Liberty, 3974 Arsenal, St. Louis, Mo. 50 DIFFERENT stamrs free to approval applicants. Rubin Huffman, 405 Pennsylvania Ave., Brooklyn, N. Y. MR. ADVERTISER: Ask today for a copy of the “Quick-Action Advertising Rate Folder.”’ It contains some really important facts which will prove interesting and valuable to you. It also tells ‘‘How You Can Use Popular Science Monthly Profitably.”’ You'd like to know, wouldn’t you? Address your inquiry to: Manager Classified Advertising, Popular Science Monthly, 250 Fourth Ave., New York. TYPEWRITERS AND SUPPLIES TYPEWRITERS: all makes; lowest prices; 5 year guarantee; send for illustrated catalogue. Hoey Typewriter Co., 217 West 125 Street. New York, N. ¥- AGENTS, $14.85 daily in advance. Bonus besides. Send for sworn proof. Introduce finest line guaranteed hosiery you ever saw. Beats store prices. 126 styles, colors. New selling plan. We deliver or you deliver, suit yourself. Auto furnished. No experience needed. Spare time satisfactory. Credit given. Samples fur- nished. Wilknit Hosiery Co., Dept. 232, Greenfield, Ohio. AGENTS, both sexes, we manufacture and control new household article. Fast seller. aes peeets. Exclusive territory. Write now, Connolly, 123 York. iberty St., New TYPEWRITERS. All Models, used and rebuilt, at lowest prices. Send for price list before buying else where. We save you money. Keith’s Supply House, Long Branch, N. J. WANTED DETECTIVES needed everywhere. Ixperience un- necessary. Particulars free. Write, George Wagner, former Government Detective, 1968P Broadway, N. *- WANTED—Representatives in every factory in the United States. Popular Science Monthly, 250 Fourth Ave., New York. May, wa 7 we net sin the po are evi ed tie ins fer wi TI an S| of OI ti

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May, 1926 MONEY MAKING OPPORTUNITIES SECTION Remodeling an Old House (Continued from page 30) wall is a more difficult and arduous task. Most floors that have been subject to wear for twenty or more years usually need renewal. They are probably of single thickness. The wide oak boards of the antique house show knotty high points, cracks and warping. Later floors are open-jointed and splintery. What- ever it be, the old surface may be left for asubfloor. After nailing down loose board edges and removing excessive irregulari- ties, cover with one or two layers of build- ing paper, and apply new flooring, pre- ferably quartersawed stock in narrow widths of oak, maple or yellow pine. Then you will have a substantial, warm and creakless floor that will last many years. UR ancestors built their ceilings low because with the inadequate heating system of log fires they had to conserve warmth. To increase the height of first floor ceilings, we may raise the house above its foundations and lower the floor. If the foundations are high, the floor may be let down without jacking up the building, and the cellar can be deep- ened to make up for the loss. The floor joists that are lowered may be attached to the walls with metal hangers or they can rest on a masonry edge added to the foundations. With this method there may be some exposure of foundation walls within the living quarters, but these may be covered with trim and regarded as a baseboard, or enough material may be added to the upper part of the interior wall to equalize the difference. On the outside, the exterior house covering may be extended to cover the section of foundation used as upper wall. F the ceilings of both first and second floors are to be lifted, perhaps enough space can be taken from the attic; which, of course, will give angled ceilings to the second floor. Another method is to raise or extend the roof upward. The illustra- tion at the top of page 29 shows how a new roof can be built over an old one while the family continues to live in the house. It is a novel scheme, original with the owner, W. Williams, and seems to be a good one, for besides affording shelter to the occupants it protects the interior during the remodeling period. In a dry season or climate, the job could be ta more quickly and economically by demolishing the old roof first. Sometimes a spacious ceiling for a living room is obtained by sacrificing the part of the second floor immediately above. Almost any height can be realized in this manner. While a very high ceiling always looks well and affords airy coolness in summer, it may not be a good thing in winter from the heating standpoint. I know of a case where the living room reaches the total interior height of the dwelling. It is handsome enough, but almost unusable in winter. More windows or larger ones are needed by houses according to their antiquity. For this job, we should first obtain the hew window frames and figure the space they will occupy — (Continued on page 126) a 125 is a profession begging for clean-cut, earnest men, like yourself! Look into it. 60.000 Moler graduates know Modern Barbering is easy to learn, inexpensive, quicker to earn, clean and FASCINATING! It pays Reetanen and perhaps you, like other am- bitious men, due to the lack of money, time and education necessary to master difficult mechanical trades, wonder what you cap get into quickly and make the most out of, now! aven't you overlooked the better than you think! FIND OUT! very thing you are looking for? For there Write for booklet C5. Address the branch of the MOLER SYSTEM OF COLLEGES nearest you (Street address not needed Chicago, III. Detroit, Mich. Memphis, Tenn. Los Angeles. Calif. New York, N. Y. enver, Colo. Dallas, Tex. Salt Lake City, Utah St. Louis, Mo. New Orleans, La. Houston, Tex. San Francisco, Calif. Kansas City, Mo. Omaha, Nebr. San Antonio, Tex. Tacoma, Wash. Cincinnati, Ohio Milwaukee, Wis. Minneapolis, Minn. Portland, Ore. Cleveland, Ohio Atlanta, Ga. Seattle, Wash. Winnipeg, Man., Can. Fargo, N. D oronto, Ont., Can. = in Cash Prizes See Page 4 in front of book for details ee Chance Is Bice, Mail Coupon Before You Lose It @@eees eee eee eaenaneeeeesee oe” Franklin Institute, Dept. P272, Rochester, N.Y. Rish to me without charge. (1) sample Bice @ Railway Postal Clerk Examit arebaramsibene mn ll _me how to get aU.S.G : @ tell Steady Work— plas s—Paid Vacations 4? list of places at whieh examin: Travel—See Your Country Common Education Sufficient Many other positions for men-boys 18 up 4 Railway MAIL CLERKS Sirs: eo Name. tien SO EET eee Te

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126 MONEY MAKING OPPORTUNITIES SECTION NVENTORS your ioe YOUR IDEAS Before disclosing your invention send for our Evidence of Invention Blank. This should be signed and witnessed and returned to us with a model or oF sketch and a description of your invention for our Inspection and Instructions which are free. EVIDENCE Also send for Terms Reasonable Best References RANDOLPH & CO. Dept.130, Washington, D.C. RANDOLPH & COMPANY, Evidence of. Invention blank and your guide “How Our guide book ‘*How to Get Your Patent”’ which is sent free upon request. This book includes full instructions regarding U. S. Pat- ents, Trade Marks, our Terms, Methods, etc. WRITE TODAY Washington, D.C. Dept. 130. Please send me FREE OF CHARGE jyour to Get Your Patent.’’ rw wr Ae Cee? a — at your finger ends Know the facts in Electricity. They mean_more money and better position for.you. Hawkins Guides tell you all you need to know about Electricity. Every important electrical subject covered so you can understand it. Eusy to study and apply. A com- plete, prac‘ical working course, in 10 volumes. ooks ai 2 pocket size; fiexible covers. Order aset to-day to louk over. HAWKINS GUIDES 00 PAGES $1 A VOLUME 4700 PICTURES $1 A MONTH These books tell you all about — Magnetism — Induction — Experiments—- Dynamos— Electric Machinery — Motors — Armatures — Armature Windings — Installing of Dynamos— Electrical Instru- ment Testing—Practical Management of Dynamos and Motors -Vistribution Systems-Wiring-Wiring Diagrams —Sign Flashers—Storage Batteries—Principles of Alter- nating Currents and Alternators—Alternating Current Motors—Transformers—Converters— Rectifiers—Alter- nating Current Systems—Circuit Breakers—Measuring Instruments—Switch Boards—Wiring—Power Stations —Installing —Telephone—Telegraph —Wireless—Bells— Lighting—Railways. Also many Modern Practical Appli- cations of Electricity and Ready Reference Index. SHIPPED TO YOU FREE Notacent to pay until you see the books. Noobligation tobuy unless you aresatisfied. Send Coupon er ak —and get this great help library and see if it is not wort $100 to you—pay $1.00 a month forten monthsor returnit. 65 W. 23rd St., N. Y. you $1 each month until paid. Name.... Address... . Occupation .... ee ee NS TEE CCC TCT TC 5T3 THEO. AUDEL & CO. Please submit for examination Hawkins Electrical Guides (Price $1 each). Ship at once, prepaid, the 10 numbers. If satisfactory I will agree to send you $1 within seven days and to further mail $2.50 an Hour Easy YOUR PROFITS IN ADVANCE : STAY - PREST TROUSER PRESSER - sells quick— everywhere. ‘Thousands in use. Salesmen and_sales- women cleaning up. Sells on eight-minute demonstration. Ressonable price. 40% clear pro.t for you. You take orders. We deliver. Wonderful New Invention Futs perfect crease in trou- sers. Takes out wrinkles and baggy knecs. Easy to use—takes less than a minute. |olds into small size. kinely finished. Looks rich. Saves clothes and tailor bills. Every man wants one oP two. Make Big Profits — Others Do Jack Ames made $24.00 in four hours. Randle sold twenty-five the first day. Mary Roberts made $10.00 in one evening. Others making good in full or spare time. So can you. Write us quick for free FREE sample ofer and full details. The Getgey-Jung Co., Dept. E-143 G.&J. Bldg. Cincinnati, 0. FOUR PATENTS To the Man With an Idea I offer a most comprehensive, experi- enced, efficient service for. his prompt, legal protection and the development of his proposition. Send sketch, or model and description. for advice as to cost, search through prior United States patents etc. Preliminary advice glad- ly furnished without charge. My experience and familiarity with various arts, frequently enable me to accurately ad- vise clients as to probable patentability be- fore they go to any expense. Booklet of valuable information and form for properly disclosing your idea, free on re- quest. Write today. RICHARD B. OWEN Patent Lawyer 6 Owen Building, Washington, D. C. 41-D, Park Row New York City TRADE - MARKS © REGISTERED Remodeling an Old House (Continued from page 125) plus doubled two by fours on every side. Of course at least one of the wall studs already in place will represent part of the frame support. Mark the indicated area on the wall and saw out the material. A neighbor of mine used this method suc- cessfully. When he came to nails he used a hacksaw. This operation naturally applies to wooden construction. Putting new windows in a stone or brick house verges on engineering. O make a few good-sized rooms out of several cubby-holes presents no difficulty unless partitions which support structural weight must be shifted. A good many persons with enthusiasm and more or less skill with tools do their own house revamping. Often they accom- plish it in spare time from regular jobs, using nights as well as holidays. By thus being your own contractor and carpenter, you can save a few hundred and perhaps even a few thousand dollars. Helium May Not Be Inert HE formation of an apparently stable combination of helium and mercury was recently announced by J. J.. Manley, chemist, of Oxford, England. According to his statement, the combination brought about electric discharges, and, considered a helid of mercury, is perfectly stable under normal conditions and is easily absorbed by charcoal at a temperature of —310° F. The combination is split up into its components at a comparatively high temperature. This announcement completely upsets the prevailing theory of atomic structure. Helium, argon, krypton, xenon and neon form a group of elements known in chem- istry as “noble” or inert gases, because they combine neither with one another nor with any other known element. This disinclination to combine was accounted for by their atomic structure in accord- ance with the generally accepted atomic theory. If further research should verify these statements, it would prove that helium is not an inert gas and would throw into confusion many important fundamentals of the present atomic theory. What Our Readers Say A splendid magazine. Keep up the good work! More .power to you!— G. C. S., Allentown, Pa. I take pleasure in returning check sent me for the Picture Contest. Please enter my subscription to your important magazine, which I enjoy very much. would rather stop eating (if I had to save money that way to pay for it) than be without it!—A. H., Santiago, Chile, South America. PopuLar SciteNcE Monrtuty is appre- ciated by the employees here on my ranch more than any other publication that comes here.—J. H. C., Agate, Neb. As a reader of your magazine, I wish to congratulate you upon the article, “Just What Tools Do You Need?” in the March issue. In my own é¢stimation, a magazine which contains anything on tools contains something worth-while.— K. McK., Alba, Tex. May, 1926 ous eee 2 ( CEA @

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May, 1926 MONEY MAKING OPPORTUNITIES SECTION

MY PATENT - Wa gill , ves Oe i a . ET FROM “ & ae - : AT. OFF. — , | Write for these

At the left is a view of my drafting and specification offices where a large staff of experienced experts are in my constant employ. All drawings and specifications are pre- pared under my personal supervision. PROTECT YOUR IDEAS Take the First Step Today—ii%

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If you have a useful, practical, novel idea for any new article or for an improvement on an old one, EC O R you should: communicate with a competent Registered Patent Attorney AT ONCE. Every year thou- me rn edb ) sands of applications for patents are filed in the U.S. Patent Office. Frequently two or more applica- tions are made for the same or substantially the same idea (even though the inventors may live in differ- INVE NTION ent sections of the country and be entirely unknown to one another). In such a case, the burden of BLANK proof rests upon the last application filed. Delays of even a few days in filing the application sometimes ; , mean the loss of a patent. Solose no time. Get in touch with me at once by mailing the coupon below. ‘ei aes MAY CONCERN

No Charge for Information a3 on How to Proceed Strict Secrecy Pre- i S== The booklet shown here contains valuable information relating served—Write Me in

to patent procedure that every inventor should have. And with pa eats it I will pt send you my a ls of Invention”’ form, on which Confidence you can sketch your idea and establish its date before a witness. Such evidence may later prove valuable to you. Simply mail z a ; the coupon and I will send you the booklet, and the ““Record of are held in strictest confidence in strong, steel, Invention” form, together with detailed information on how to fireproof files, which are accessible only to proceed and the costs involved. Do this NOW. No need to authorized members of my staff. Feel free to lose a minute’s time. The coupon will bring you complete in- formation entirely without charge or obligation. All communications, sketches, drawings, etc., write me fully and frankly. Your case will have my personal attention. It is probable Prompt—Careful that I can help you. Highest references. But 7 S = FIRST—clip the coupon and get my free book. Efficient Service Do THAT right now. This large, experienced organization devotes its entire time and attention to patent and trademark cases. Our offices are directly across the street from the U.S. Patent Office. — | fehl Wy 4 _. '@) é We understand the technicalities of patent law. We know §& J al t : Ss oupon BW AAd : the rules and requirements of the Patent Office. We can

Practice confined exclusively to Patents, Trademarks, and Copyrights 0 5 Re Tle eee eee ee eee eee res ooseesees (Important: Print or Write name clearly), proceed in the quickest, safest and best ways in preparing | | an application for a patent covering your idea. Our success {f CLARENCE A. O’BRIEN has been built on the strength of careful, efficient, satis- § Registered Patent Attorney \ factory service to inventors and trademark owners located t 8897 S came t poe » teas in every state in the Union. 3 Wilinatan . ommercial Ban Sy i pon <, e ‘ lll Clarence A. O'Brien, ps ste: yo frp book. “How to Obtains Pare ° and your ‘Record of Invention” form without any cost or PF Registered Patent Attorney I obligation on my part. Member of Bar of: Supreme Court of the United i N q States; Court of Appeals, District of Columbia; : PI ea Se. 5a ee ec ay Ge: S'S Brie el SR ATS Nee: ne Iee Wie Ore RO RTE MER TS i Supreme Court, District of Columbia; United States Court of Claims le SEL, 5a ae awid wane annem a aninses Sor eee ers i

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MONEY MAKING OPPORTUNITIES SECTION May, 19% PATENT TRADE-MARKS DESIGNS FOREIGN PATENTS MUNN @ CO. PATENT ATTORNEYS Associated since 1846 with the Scientific American 683 WOOLWORTH BUILDING 522 SCIENTIFIC AMERICAN BLDG. New York City Washington, D. C. 1311 TOWER BUILDING 664 HOBART BUILDING Chicago, Ill. San Francisco, Cal. 519 VAN NUYS BUILDING Los Angeles, Cal. aS Books and Information on Patents and Trade Marks By Request. Associates in All Foreign Countries. | INVERTHONS sees || PATENTS ON ACASH OR ROYALTY BASIS BOOKLET FREE HIGHEST REFERENCES PROMPTNESS ASSURED BEST RESULTS Send drawing or model for examination sae ie 25 Nears Sabhlbeline. References. WATSO hog l ot - ol ag ssced * . atent Lawyer Ure ADAM FISHER Mrs. Co. 644 G Street N. W., Washington, D. C. 183-D Enright Ave. St. Louis.Mo. PATENTS \ f who derive large- | Ltade-marks, Copyrights, Patent Litigation, IN ENTORS: est profits know Handbook with illustrations, 100 mechanical simnle but vita movements. Sent free dn request. facts be 1 f book - glw x those fneta, sent free, Write LACEY & LACEY. ALBERT E. DIETERICH 648 F St., Washington, D. C. tstabliched 1869. Formerly member Examining Corp. U. S. Patent Office Patent Law yer and solicitor 27 years’ experience ——— 681-A Ouray Bldg. Washington, D. Cc. $200 a Week in this Outdoor Occupation” ae ie = Men —Women — get out of : stuffy offices, stores and fume- a ; wT | GEND! DFOR SF ma N, = filled factories. I did, and I now earn $200 a Proof! weekasaRealEstateSpecial- Jia? wonthe'= Wok, THIS FOR ist. If you want to learn the wetitade "S800 tn tree t } secret of my success and use [months in my stare my amazingly resultful Pennsylvania. ° “Enabled me to sell system, mail coupon at once many thousand dollars for a free copy of a new Carrie: Marshall Mise. al- | DONT LOSE YOUR RIGHTS | TO PATENT PROTECTION | “ Before disclosing your invention to anyone ff book “How to Becomea Real J, ,jis4¢ $1,200 send for blank form “EVIDENCE OF CON- | Estate Specialist. cae _itcLenop Oreron. CEPTION”’ to be signed and witnessed. A § sample form together with printed instructions f will show youjust how to work up your evi- dence and establish thesame before filing ap- #f plication for patent. As registered patent at- ff Ha Itshows you how togetstarted aie | ‘Btewart, Florida. right at home—in your spare ‘ **Mad de $ $4,560 tn one -pecende eat ; we time—without capita] or ex- ‘Made net prolits oi * gg in one month.’ Nw. perience; how you can build $ a profitable, independent “% M. Coffey, N. J j torneys we represent hundreds ofinventorsall ff panes of nnn a ae a ee. ii over the United States and Canadain thead- iM vancement of inventions. Ourschedule offees § willbe found reasonable, The form “Evidence § of Conception,” sample, instructions relating fi if to obtaining of patents and schedule of fees fi} sent uponrequest. Ask for them,—a postcard ff} A will do. PATENTS aee/7 N TRADE MARKS [ANCASTER ¢7e &.ALLMINE Registered Patent Attorneys “= in U. S. and Canada 274 Ouray Bldg. WASHINGTON, D. C. more money than you ever be- Bennett, oo fore thought possible. Director, American Business i ca —E 2EE Builders, Inc. BO OK Dept.34-E 18 E. 18th St., N. Y. Director, American Business Builders, Inc. (Authorized Capital $500,000.00) Dept.34-E, 18 East 18th Street, New York Send me a free copy of your new book *‘How to Become a | Estate Specialist.’’ Name..--.. Americans Plan World’s Largest Airship (Continued from page 35) exactly,” said Dr. Arnstein, “that a ship of this size can be designed to meet any conditions. In planning the GZ-1, we have taken into account every possible contingency. “Even suppose we count on the dash- ing of the ship against a mountain, we know that the only injury would be a slight bending of the girders. The helium cells within could not be damaged. And even if that were possible, we know that such a ship w ould operate efficiently with two cells empty.” Dr. Arnstein told me that the GZ-1 will carry easily 100 passengers in addition to a dozen tons of freight and baggage and from three to six tons of mail. It will be fitted out like the finest ocean liners, with passenger cabins, staterooms, bathrooms including showers, and dining rooms. It will have promenades running the length of the ship on both sides, with windows from which passengers may view the world below. oem his description I could picture this Leviathan-of-the-air at a not far distant time sailing high over the sea as a commercial ship, speeding past the swift- est of ocean liners below, carrying pas- sengers in luxury from New York to Lon- don in two days, and making the round trip to Europe and back in a week or ten days. I could visualize this same gigantic air liner on a world cruise, picking up fuel and supplies from a mother ship in the Philippines, or tying up to a mooring mast somewhere in Europe. And when I left America’s Zeppelin plant, with its busy group of skilled and determined men, it was with a feeling of renewed confidence in the future of ships that are lighter than air. Perhaps it is much the same feeling that is back of the discussion in Congress of an appropria- tion for two 6,000,000-cubic-foot dread- naughts of the air to replace tne Shenan- doah, or that has induced a Detroit air- craft concern to plan an all-metal airship more than twice the size of the Shenan- doah, to be fireproof and weatherproof. ROM the navy plans of the huge aerial dreadnaughts, we can picture them bristling with guns to repel attacks of air- planes. According to the dese ription given by Rear-Admiral Moffett, navy air chief, each would be armed with twenty- five machine guns and with 9700 rounds of ammunition. They would have no armor, but would rely on the non-inflam- mability of helium gas for protection from bullets fired from the ground and from airplanes. Their machine guns would be so situ- ated, says the Admiral, that an enemy aircraft could not approach from any direction or angle without receiving 4 concentrated fire. “In this air vessel,” he adds, “five hundred men, each with forty-five pounds of equipment, could be carried from San Francisco to Hawaii in thirty hours and arrive after that journey with a twenty- four-hour reserve of fuel.” Originators of forms “Evidence of Conception.” May, 192¢

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oo ae ul New York Office Suite 1007 Woolworth Bldg. | Philadelphia, Pa., Office | Suite 518-519 Liberty Bldg. Victor Bldg. MONEY MAKING OPPORTUNITIES SECTION OUR OFFER: . Your first step ? Before disclosing an invention the inventor should write for our blank form ‘‘RECORD OF INVENTION.” This should be signed, witnessed and returned to us together with model or sketch and description of the in- vention for INSPECTION and INSTRUC- TIONS. NO CHARGE FOR THE ABOVE INFORMATION Our Four Books Mailed Free to Inventors Our Illustrated Guide Book HOW TO OBTAIN A PATENT Contains full instructions regarding U. S. Patents. Our Methods, Terms, and too Mechanical Movements illustrated and de- scribed. OUR TRADE-MARK BOOK Shows value and necessity of Trade-Mark Protection. Information regarding Trade- Marks and unfair competition in trade. OUR FOREIGN BOOK We have Direct Agencies in Foreign Coun- tries, and secure Foreign Patents in shortest time and at lowest cost. Progress of Invention Description of World’s Most Pressing Problems by Leading Scientists and Inventors ALL COMMUNICATIONS AND DATA STRICTLY CONFIDENTIAL INTERFERENCE AND INFRINGEMENT SUITS PROSECUTED IMPORTANT TO MAKE YOUR CASE SPECIAL AND AVOID DELAY YOU SHOULD HAVE YOUR CASE MADE SPECIAL IN OUR OFFICE to secure protection, save correspondence and obtain early filing date in Patent Office. To secure special preparation of your case send $25.00 on account with model or sketch and description of your invention. ee Private Office, Victor J. Evans, with. view of Patent Office Through Window Highest References Prompt Attention Reasonable Terms VICTOR J. EVANS & CO., Patent Attorneys Main Off.ices: 760-9th St., N. W., Washington, D. C. Gentlemen: Please send me FREE OF CHARGE your FREE books as described above. a i ie nt 5c) inh wenn BAS TRING EES Ui ae die ioe aah ar Ea ea Sere ee ec ae ee ee Se we Chicago, Ill., Office Suite 1114 Tacoma Bldg. AS CAAA VAS = - Pittsburgh, Pa., Office Suite 514 Empire Bldg. a ee oe miriciwiriia a mal Suite 1010 Hobart Bldg.

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MONEY MAKING OPPORTUNITIES SECTION You Fly by Flying! SWEENEY SYSTEM of Practical Airplane Mechanics opens up a world of opportunities for young men. The Sweeney System has no planes to, sell, and sticks Strictly to teaching both ground work nae pilotage. Sweeney Airport approved by U. S. Air _ Sei vice as one of the best and safest fields in the U. All the resources of this Million Dollar School moore you the best,.most practical instruction. Mechanics earn $50 to $150a week. Flyers up to $500. THE SWEENEY SYSTEM first prepares a student by intensive practical work on motors, building, recover- ing wings, rigging and all details of construction, re- Look at These Opportunities Aviation Mechanics —$50-$125 Week miggers 50-$75 Week Flyers— %125- $225 Week pairing and handling. This —e is called ground school be a work. Instructor Spencer, Aerial Photo Pilot— an overseas flyer, tells you $200-$250 Week that it took about 4000 mechanics and assistants a tae nar 2 to keep several oy rey Week flyers in the air at his fielc wae in France. To show you ert ee ent the quality of the men who Crop Dustin teach you look at Spencer $125-$200 Week and Wimer for instance. Spencer was an army pilot and has been teaching and doing commercial fiying since 1917. Wimer is a college man, went Overseas, was with the Ist Air Park, was an observer, spent over 200 hours in the air and since the war has been with two big aircraft corporations. Crop Survey— $125-$225 Week THE SWEENEY SYSTEM is divided into two parts. FIRST: You are thoroughly taught in the ground school. This fits you as an aviation mechanic. You can build your own plane and do anything re- quired in aviation mechanics and construction and re- pairing when you have finished this work. You are thoroughly taught motors, ete., and work with thou- sands of dollars worth of new material, including all types of engines. Libertys, Sturdevants, Gnomes, Hall Scott fours and sixes, etc. SECONDLY: after completing this work if you want to be a pilot you take ten hours of flying. Now when you understand that two to seven hours is all the average man needs to learn expert flying you will appreciate what ten hours in the air under skilled men will do for you. LEARN TO FLY! Aviation is no longer a mys- tery—no longer a hazard; no, it is a business growing greater and more important; you can qualify as a mechanic, or an engineer, or repair man, or builder; five men on the ground are needed for one man in the air, but if you want to become a pilot you easily master the work and can go into postal, gov- ernment, or commercial work. Flyers are in demand, earning big money at fairs taking up passengers, etc. $5 for a 10-minute flight is pretty fine pay! SEND NAME TODAY (0c tull details of this aviation mechanical course and photographs of planes and equipment actual- ly used; also full information as to the commercial end of flying and opportunities for young men. LEARN TO FLY BY FLYING SCHOOL of AVIATION 2508 SWEENEY BLDG, KANSAS CITY.M! SEND THIS NOW PPB eee eee eee ee ee eee eee SE EMORY J. SWEENEY, President g 2598 Sweeney Bidg., KANSAS CITY, MO. 1 Please send me full information about your Aviation g Course. ' NSS aie Saye eee ee ee eee |. er . ; Re ei pats SE Oe ee Se ene, Soe eee oe eee i eee ee eee yee eee ee A Game of Uncertainties (Continued from page 21) excludes the sport from the list of exact sciences, it is significant that one breeder, John E. Madden, a close student of heredity, produces at his breeding farm, Hamburg Place, Ky., the greatest list of money-winners with amazing regularity, year after year. Still no man, not even Madden, can be certain when he has a champion on his hands; no man can be certain that his champion of today will be a champion a week hence. And so it is that race horses receive care such as a loving mother lavishes on her first-born. The delicate racing thoroughbred requires coddling, petting, and absolute regularity in feed- ing, exercise and grooming. CCORDINGLY, the typical racing stable is a large, complex and ex- pensive establishment. There is in charge the trainer. He may be an employee or he may be the owner of the horses in his charge. Depending upon the size of his “string,” the trainer will have assistants —foremen, stable hands, exercise boys, a cook, for each big stable feeds its per- sonnel, and, of course, jockeys. The day for horses and their attendants begins with dawn. In charge of exercise boys, the horses are taken to the track. This horse requires a long conditioning gallop; that one a brisk workout of a half mile; another a swift run of a longer dis- tance. Scarcely any two horses are alike in their training requirements. Some will do their best only for certain exercise boys. Some are sluggish, others lively; some mean-tempered, others staid and gentle. It is upto the trainer to know the peculiar- ities of his various charges and to conduct their training accordingly. And _ that training start’ long before they get to the race track—when they leave the sales ring. ROM the ring the young horses go to pasture, where they romp about until the fall. Then their education be- gins; a process difficult and tedious for their trainers, for these young animals are delicate, sensitive and highstrung, and easily can be harmed irreparably. It is often a real job, for example, to teach them to remain alone in a box stall. They are frightened by their new environment, and frequently refuse to eat. Gradually, though, they become accustomed to their change of circumstances. Then is begun the “breaking” process. The first step is to accustom them to bit and bridle. After this, an exercise boy mounts them bareback. A couple of muscular stable hands act as assistants in this lesson, for these young aristocrats of horsedom can put up an exhibition of kicking and bucking that would do credit to a rodeo. Eventually, though, the youngsters are walking peacefully about. Then they are saddled for the first time. There are further objections from the young horses, but again the patience and kindness of the trainer prevail. Walking exercise is the next step, usually in the company of an older, placid horse whose example has a steadying effect. When the colt or filly can walk to the satisfaction of its (Continued on page 131) Four Vital | Subjects The Lord The Holy Scripture Life - Faith by EMANUEL SWEDENBORG Book of 634 pages, clear print, good paper, substantially bound in stiff paper covers. Endowment enables us to send this book to any address without further cost or obliga. tion on receipt of only Five Cents The American Swedenborg Printing and Publishing Society Room 313, 16 E. 41st St., New York Several live-wire salesmen wanted in every state to sell Carter Oil Gauges to Ford owners, Mi dealers, accessory stores, garages, i etc. Our unique sales plan makes Bi it easy for hundreds of salesmen to get $50 OR MORE WEEKLY | Full or spare time—repeat orders with liberal commissions mean per- / manent, big-paying business. 100,000 i Carter Gauges already sold—every Ford car should have one—simple— dependable—quickly attached—fully guaranteed—Big sales campaign just start- ing—Write or wire for full details. 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May, 19% ‘ure RG Paper, covers, ook to obliga- orders in per- 100,000 —evelry mple— -fully arte Yhio in spare . Every “oduci throug ju learn. }OOL, on, D.C May, 1926 rr e e A Game of Uncertainties (Continued from page 130) trainer, it is taught to “jog,” then to canter, always with a well-trained older horse as a model, and in time it is ready for advanced studies at the starting bar- rer. This is a mechanical contrivance, developed in Australia—a strip of fabric that stretches across the width of the track and is sprung upward when the starter presses a button. The barrier is ysed at all race courses in America, and a horse’s ability to “break” the instant it rises is of prime importance; for race horses attain top speed almost in their first stride. “Schooling” at the barrier is conducted each morning by the official starter. It is atask that would try the patience of Job. In time, though, the young horses learn to stand reasonably quiet behind the barrier while it is down and to leap for- ward when it is “sprung.” HROUGH this period the youngsters are given slow “workouts” for “con- ditioning”” purposes; that is, for the de- velopment of muscle and strength. No efort is made to test their speed, and meanwhile their owners and trainers do not know whether they are embryo champions or just good saddle horses. When the young horse has learned the various gaits and has developed sufficient strength, he is given a speed trial. First, he is sent an eighth of a mile, or a “fur- long,” as the distance is usually called at the track, at top speed. If he can cover this distance in about twelve seconds, a quarter of a mile in about twenty-five seconds and a half mile in about fifty, he will “do,” and his education is continued in the finer points of racing technic. After the second January following his birth, the young horse is accounted a two- year-old, and if sufficiently “schooled,” he is sent to the races. Young horses making their debut ordinarily run half mile races at. first. Later they run four and a half furlongs. Between May and October the standard distances for two-year-olds are five and five and a half furlongs, and occasionally six furlongs. In the late fall, when they are “seasoned,” they compete in races of seven furlongs and a mile. In their second season of racing, as three-year-olds, they race against older horses and at all dis- tances, ORSES are handicapped by mak- ing the better horses carry heavier weights in their races. These are made up of the weight of the jockey and of lead pads placed beneath the saddle cloths. If, after the long training period, there could be any certainty of performance, the breeding of race horses might be something of an exact science. But, as an exact science, it would lose much of its glamor, much of its appeal. Any trainer will tell you that because a colt has shown dizzy flights of speed in trial gallops is no guarantee that he is destined or greatness in actual racing. Horses are not machines, but, like men, are subject to moods and caprices. Some horses are front runners,” and turn in their best Taces when leading — (Continued on page 132) il MONEY MAKING OPPORTUNITIES SECTION Do You Need BIG Money? The Drafting Field Needs MEN! Get Pa . Allimported instruments—the same set use myself a into the Line that is BEGGING for Help. A Line that’s EASY to This offer holds good until all my mail classes are filled to eapacity. Every industry is clamoring for draftsmen. Two hundred or more of the biggest concerns look to us first in fill- ing drafting room positions. I want to keep their good will. I can’t afford to disappoint them. So for the present, at least—I supply everything you need—tools and table—squares and triangles, pensand pencils, even the ink ! Not a penny extra for the tools that last a lifetime. Not a nickel for even the drawing paper and tracing cloth you need to get down to business. And I’ve made special terms —so easy you can earn the money five time over while I’m training you. QUICK A CTION *“*HOW dol know the Dobe course can make me worth at least $250 a month?’’ you may ask. I’ll answer that one sentence! I train youuntil you are—and at the small tuition feesI get, Icouldn’t o ford to take very long! One of my students is 51 years oid; another is just seventeen. But they'll all be makinga grown-up salary within a few short months! Will YOU? = — DRAFTSMEN—$3600 to $10,000 a year; see Help Wanted ads in every newspaper. Twenty calls for draftsmen to one ad FRED’K W. DOBE M. E. | for electricians or mechanics. Shops may run part-time, or shut down, but they never stop designing and drafting. Did you ever hear of a draftsmen who was laid off? No. The drafting offices are part of the business. Learn! Read My Offer to FURNISH ALL TOOLS! IMPOR TANT! DRAFTING isn’t ‘‘drawing!” ¢ You don’tneed any“‘talent.” A draftsman uses fools for every line and every curve. You couldn’t make them crooked if you tried! That’s why drafting is so easily learned—and so interesting. For you do everything byrule! So, I guarantee to make anyone a finished drafts- man; if you can read and write, you can learn this line. PAYING POSITIONS loom up almost as soon as you . are enrolled in a Dobe class! We receive re- quests daily for junior men—for men only partly through our course. We'll take a beginner.’’ some concerns write us, so long as he is a Dobe trained man and has begun right!”’ Furthermore, a lot of our students are willing to carry special work for pay, right while their lessons goon. Learn drafting, and you'll have a trade on which all other trades depend. They can’t build a barn without mechanical drawings. The simplest article can’t be made until a draftsman has put every part in black and white. YOU NEED NOTHING we don’t furnish; that is, if you “ act now and get the offer that includes free tools and equipment without extra expense. But all I ask now is your xame—just let me send you the particulars—and the handsomest illustrated book ever published about drafting! Use coupon: c——————————— HIEF DRAFTSMAN DOBE, Div. 13-65 | 1951 Lawrence Ave., Chicago Send me FREE and POSTPAID full information about your training, and enough material to show me how easy it is to learn drafting, and how I would like the work. Include your free tools offer. oo Pi sa caaninewdnsnvecaserucddqecvacnesenuaanns Age...... | | PEE Sica tanacenscieddsetesonsanesdatiesadutedwuedne | | SE | AGENTS Wear my wonderful shirts and take orders at startling low prices. My offer includes a handy pocket-size book of actual samples absolutely free. 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COMMERCIAL ART Meyer Both Company, maintaining the most widely known Commercial Art Studios in the World, offers you a practical training based upon 25 years’ success in produc- ing over a quarter million drawings for leading advertisers. This attractive profession equally open to men and women. Home study in- struction. Get Facts Before You Enroll in Any School Send 4c in stamps for illustrated book telling of the succees of our students. MEYER BOTH COMPANY, Dept. 35 Michigan Ave. at 20th St. CHICAGO, ILL.

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“The as Was Stumped” “He was trying to figure out a way to speed up the machines. I could sce he was stumped and asked him if he would let me try my hand at it. *“*Go ahead,’ he said, ‘but I don’t believe you can help much. Looks like an outside job to me.’ “So I started right in and pretty soon I had the whole thing worked out. The boss was watching me and I could see he was surprised. “How did you learn all that?’ he asked in that quiet way of his. And then I told him I’d been studying at home nights with the I. C. S. “He didn’t say anything and I thought he had forgotten about it until he called me in his office a few -veeks later. He said he was going to make me foreman and increase my salary $75 a month. “ ‘Keep on studying,’ he told me, ‘and you’ll get another pro- | motion soon. You can’t beat those International Correspondence Schools textbooks for good, sound practical knowledge.’ ” That’s a true story of what spare-time study has done for just one man. There are thousands of others. Why don’t you take up a home-study course with the In- ternational Correspondence Schools and prepare yourself to earn more money? Mail the Coupon for Free Booklet INTERNATIONAL “CORRESPONDENCE SCHOOLS Box 7693-D, Scranton, Penna. Oldest and largest correspondence schools in the world Without cost, please tell me how I can qualify for the position or in the subject before which I have marked an X: BUSINESS TRAINING COURSES Business Management OSalesmanship Industrial Management Advertising Personnel Organization Better Letters — | eee _ —_ Lettering usiness Law enography and Typin; te and Banking Law Haenogrs English veil Accountancy (including C.P.A,)L) Civil Service Nicholson Cost Accounting Railway Mail Cler'c Bookkeeping Common School Subjects Private Secretary High School Subjects Spanish (0 French Illustrating TECHNICAL AND INDUSTRIAL COURSES Electrical Engineering Archi Electric Lighting Mechanical Engineer ] Mechanical Draftsman Machine Shop Practice Railroad Positions Gas Engine Operating Civil Engineer Surveying and Mapping | Airplane Engines enemy od OM Agriculture and Poultry Steam Engineering a} Hadlo Ci Mathematics c jArchitects’ Blueprints Contractor and Builder Architectural Draftsman Concrete Builder Structural Engineer Chemistry © ee Automobile Work a PIE coinve nvsevnsnncbiccvovebecenssentoesswubneopbebineassonisonecconerrseepecoesosree Cig... Occupation........... Jf you reside in Canada, send this coupon to the Interna- tional Correspondence Schools Canadian Limited, Montreal Music Lessons | WITH AN ACCREDITED SCHOOL > At Home> A Complete Conservatory Course B M il Wonderful home study music _! (tt under y great American and European teacherm Endorsed by AL nim Master teachers guide and coach you. Lessons a marvel of simplicity and completeness. Write telling us course you are Any Instrument interested ieladie-ttene. Harmony, — Public ane ‘sic, a Cornet, Mandolin, Guitar, send our Free Catalog Banjo, or Reed O —and we wi nd now. wth details of course you want. VERSITY ay GONZERVATORY uM Myers Bui MONEY MAKING OPPORTUNITIES SECTION A Game of Uncertainties (Continued from page 131) the field from start to finish. fleet but faint-hearted; they like lightning, but quit to a challenged by another racer. Inconsistency of horses, and sometimes shocking “form reversals,” attend every operation with the racing thoroughbred. A conspicuous example is that of the noted Morvich, winner of the Kentucky Derby in 1922. Others are will get off walk when HIS colt won his first race at Jamai- ca, N. Y., at odds of 40 to 1. He won his next start and his next and his next, all in hollow style. He took first place in every start he made that year The next year, as a three-year-old, he romped to victory in the Kentucky Derby, and netted his owner, Benjamin Block $38,450. And then, just when the wise men of the turf were ready to place the seal of greatness on Morvich, the colt’s career on the track came to an abrupt end. He | was ingloriously defeated in every start | he made. So his owner retired him to the stud farm. As an investment Morvich paid generously, for he won $172,809 during kis career. To his owner, though, and to race-goers generally, he was a dis- appointment, a bursted bubble. Or consider the case of Zev, Harry S. Sinclair’s remarkable colt, whose winnings of $313,639 in three vears of racing broke all records for earnings by an American horse. Victor in the famous Kentucky Derby, in the international match race with the English Derby winner Papyrus, and in several of the richest American stake races, Zev seemed one horse that had earned the title “great.” Yet at the summit of his career, Zev developed cunning, became lazy and ca- pricious. He had lost none of his amazing speed, but no jockey, no efforts of his trainer, could make him extend himself unless he wished. So he was withdrawn from racing. Consider, also, that greatest of all American racers, Samuel D. Riddle’s wonder horse, Man-o’-War. This mar- velous performer stood in relation to the other horses of his time—perhaps to all other horses of history—as a diamond to a handful of pebbles. Yet once in his twenty-one starts he was beaten, un- expectedly and unexplainably, by a horse | that oddly enough was called Upset. HE hope of every man who races horses, professionally or as a hobby, is to possess himself of an animal that has the balance in speed, courage, endurance, action, health and temper that racing men call ‘“class’’°—qualities that enable him to do anything his trainer asks of him; to run on wet tracks or dry, in sprints or long races, to carry weight, to withstand shipping from track to track, climatic changes; a horse, in short, for whom, win- ner or loser, no excuses have to be made. Such a horse was Man-o’-War. Such horses were Exterminator, Roamer and Grey Lag of recent memory, and Syson- by, Domino and Salvator. Such a horse, probably, Pompey, last year’s two-year- old champion, will prove to be. May, 19%, ‘OWN ae 1 RailwaywWor RAFFIC Inspectors travel near home ct about the country; report confidentially to chief executives, opening way to fine advanee- ments. Due to contacts with many railways, we place graduates to carn at start $28 to $40 weekly, expenses paid, or refund tuition, Pay increases fast—up to $250 monthly—with experience. The only training-school of its kind. Easy, spare-~ MORE MEN home course quick ely complet WANTED inexpensive; terms given. V rit, TO FILL for FREE Booklet No. L-64. POSITIONS youR OW Standard wee gg Training Inet. Buffalo, N. Y. Become an Auto Espert-ll 3: { train you in 8 weeks. No apprenticeship. Why work four years for boy's wages? Be a man! o labor unions to join. hil ; I Pay Your R. R. Fare while ry, shor. Price training offer lasts. Save ONE-THIRD NOW, You on with real tools on actual equipment. No tired. Your Many Earn $75 to $150 Weetl money back if not perfectly satisfied. 100,000 experts needed right now to repair America’s 20,000,000 cars, F PF E E — for big 64 page kook and remarkable offer. Don’t wait a minute. iC SWEENY El seaexeciseat SCHOOLS oth Pe, Sets Sts. Dept. 136 Cincinnati, 0, Men Wanted to manufacture Metal Toys and Novelties. No salesmanship necessary. Demand exceeds supply and we co-operate with you in selling goods, also buy them from you. We put you in touch with the bu- ers. Guaranteed casting forms with complete outfit furnished for speedy production of Toys, Novelties, Ash Trays, Bookends, and other big all year sellers. Absolutely no experience or machinery necessary. No special place needed. Small investment puts you on road to success. You do the manwineiens and we take care of the selling. Act immediately if you want to handle big 1926 wholesale orders now being placed. Strictly a business proposition Catalog and information mailed on request. Metal Cast Products Co. 1636 Boston Road, New York Write today for FREI 138-90 MAN whic bh show money. are to enter fe book, “THE LAW TRAINER aw fn your spare cime and te for shiz bi 4 salaried executive po e practice of law. Study at peme no se prepar: rominen [ee GUSTICE WILLIAM HOWARD TAFT. lay Magnificent 25 vo ae faw lib: r prepare the Blackstone ties including Blackstone graduates practic conferred. immediately upon enrollment. Moderate toren fee. mney Back Guarante monthlyterms. Mo: e. Writefor' we i Blackstone institute, tnc., 272 ont. Grand © 4 America’s Foremost Non- = ‘ AGENTS 500% PROFIT GENUINE GOLD LEAF LETTERS. Guaranteed to never tarnish. Anyone can put them on stores and office _w indows. Enormous demand, large profits, Paul Clark says: smallest day $28.70. R.L. Reel made $920 in two months. Write today for free sample and liberal offer to general agents. METALLIC LETTER CO.. {1A N. Clark Ste. Chet Chia Begin ‘louay—wrice tor my FR BOOK, Tess make a food penman of ) of you at home during an time. of or my FREE BOOK,‘ HowtoBert" ns a Good Penman.’’It winties Bpermns ns ant on how others mastered penmanship the Tam “3 "| System. Your name will be elegz nly written be : car d if fed Ears stamp to pay postage. rite day for b FW. TAMBLYN, 437 Ridge Bldg., Kansas City, US.A A 2c STAM P— will start you on the road to success: See Money Making Opportunities " pages 116 to 142.

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May, 193, SS Vork ome cr tially to idvanee. ays, we to $49 mn. Pay lyY—with chool of re-time, npleted: n. V rite . L-64, nq Inet, — St —- a

for boy's ) y short- educed ‘D NOW, rent. No - Weel 10 experts 000 cars, markable nnati, 0, ies. No supply also buy the buy- te outfit ovelties, - sellers. cessary. nt puts veturing iately if prs now osition. lew York

yne can ndows. 1Clark | made or free ents. Chicago. ten ona y rite to- USA eins hee cess: s on May, 1926

Only the Daring Can Work | for Him (Continued from page 32) Emest’s feet, trying to turn him over the third time before the flier hit the net. But Ernest’s head was twisted just a little to one side as it met knotted ropes. He died three days later. Within a week of Lane’s death in Chicago, another flier, Jack Ernest, who also trained in Eddie Ward’s Blooming- ton barn, died in Rio de Janeiro. Jack was trying a two-and-one-half forward somersault. The particular danger in this trick is that the flier is revolving face forward and if he misses his catcher’s hands is apt to meet the net that way. Jack missed his catcher’s hands and died from a broken back. “TVE had a good many of them in the hospital from time to time,” says Eddie, ** but those are the only two fliers Iever lost.” I've never been able to find out just why fliers continue to flirt with gravity when they could earn almost as much money doing less dangerous and more easily mastered acts. It takes four years to make a flier. Eddie has some one on the injured list nearly all the time. Yet his Bloomington school for fliers never lacks applicants. He always has a wait- ing list. Perhaps it is because he has a way of making stars out of them. Twice each year for three years, Bert Ward has dived from the top of the rig- ging to the net, thirty-one feet below, and during his thirty-one foot fall has turned a backward somersault—a double pirouette—a horizontal double revolution —and another back somersault, before he has flipped his body over and landed on MONEY MAKING OPPORTUNITIES SECTION

his “balled up” shoulders. Bert, who is 22 and weighs 138 pounds, will, in all probability, break his neck if he mis- calculates the tenth part of a second. But he learned the trick with a safety belt, and since he took the belt off has not | miscalculated—yet. | “Why do you do that fancy trick?” I | asked Bert at Schenectady, N. Y., last summer, “It will get you sometime.” ERT looked at his chief, as the two sat on their dressing-room trunks. “Why do I do it?” he asked the veteran. “Why does a man want to be president of the United States?” Eddie countered. “I was in the 1918 railroad wreck near Gary that killed my sister and another girl in our company and jammed up every one else in the act. I’ve hung head down- ward longer than any man on earth. I own a valuable home in Bloomington. I own a farm near Cedar Rapids, Iowa. “T don’t have to dress in tights and do stunts for the towners twice a day in all kinds of weather. I don’t have to put a level and tape lines on my riggings to be sure they are hanging straight. I don’t have to figure on gravity day in and day out. I don’t have to do a lot of things that are difficult, dangerous, and some- umes disagreeable. Neither does Bert or any member of my company. “But a fellow gets a kick out of doing any star act, in a circus or out of it. It's great stuff while it lasts.”

133 00 Farned Monn A Big Money-Making Business A Business to Enthuse Over—The “Ideal” Lawn Mower Sharpener Awondertul invention that sharpens lawn mowers sclentifi- cally—quickly— perfectly; does the work as nothing else can. FRED C. MILKERT OF ROSELLE, ILL., WRITES: ‘‘The Ideal Lawn Mower Sharpener put me in business, starting in the basement of my home and forcing me now for the third time to move into bigger quarters. Today the dream of my life—a shop of my own—is realized. With a machine like yours and a little hustle any man can have a businessof his own and be independent.”” W. F. Kendt, Buffalo writes: E. W. McCormick, Saginaw, “I sharpened 994 lawn mow- Michigan, writes: ers last season, and the re- “T have ground over 5,000 ceipts were nearly $2100.00 mowers during the past five which is not bad for a side years besides working at my line.”” trade.”’ Fred Milkert, Roselle, Ill., writes: “‘Last Junel sharpened 256lawn mowers for which I ree y

Zeno Brandon, Middletown, Ohio, writes: “I made $820.70 in 55 days with my ‘Ideal’. Have made as high as $38,70 in one day ” You Start Now No town too small. D.S. Newcomer of Vinton, Ia. writes: ‘People come from miles around and from other towns to have their mowers ground.”’ Lawn mowers are dull—owners don’t know where to get them sharpened. Mowing the lawn dreaded because of dull or improp- erly sharpened mower. Lawn mowing healthful, in- vigorating and pleasant when mower is “Ideally” sharpened. You do the work scientifically—you are in big demand. Lawn Mowers Sharpened to e@=— People glad—owners delight Razor Edg in mowing lawn with mower sharpened on an “Ideal”. Mowers run light—click-click- click and the grass is cut. Build permanent business for yourself, Start now! : Write Today gm Ef USE THIS—MAIL IT TODAY FRE Detailed illus- trated catalog The Fate-Root-Heath Company # 918-944 Bell St., Plymouth, Ohio Please mail at and booklet “Let George Say It.” once free Illustrated Cata- log and Booklet ‘‘Let George Say It."’ Write today. - Electricity needs men like You ERE is the chance of your lifetime to start in this business and start right by actual electrical experience in the Greer Shops. This 12 weeks training starts you into any branch of Electrical or Radio fields. Earn while learning if you wish. R. R. fare paid to Chicago on cash enroll- ments. Excellent tool outfit free with course. Send the coupon below now for full information about this wonderful training plan. This was formerly the U. S. Government Veteran Bureau course, equipped at cost of about a quarter of a million dollars. When Congress discontinued the course for veterans, we bought this marvelous equipment and added it to the Greer Shops. The same chief instructor who was in charge for Uncle Sam has been kept to supervise the work—the man who perfected this wonderfully effective system of training. Learn Quickly, Thoroughly Here Here you learn by actual practice on real, high class equipment, under supervision of electrical experts. Simple experiments begin the first day. The thrill of accomplishment grips you —the joy of mastering this great friendly giant power — Electricity—and making it do what you wish. One great advantage of our system is the individual instruction. You go ahead as fast as you are able without being held back because some one else is slow. Complete, Up to Date Equipment Over 200 motors, complete line of motor starters, over 300 testing instru- ments—voltmeters, ammeters, etc. Armature and stator department has latest equipment for winding, taping and forming. Bungalow right in the shop—for

tearning house wiring. Load testers, rotary converters, alternating curreat gener- Clip ator, bigh tension line, automatic telephone panel. These are some of the this devices you learn about by actual use here. Last, but not least, we recently Coupon. took over one of the largest strictly radio schools in the country. Send it NOW! Free Employment Service Address me

We help you to get the right start in every way we can. Many 4 of our graduates go into business for themselves soon after finish- Ww ing this training. This moment is oneofthe .?~ greatest turring points of yourlife. Ifyou * do not find Plt ttt ttt bt btbb te bttttt ttt ttt ttt ttt + hyde : Erwin Greér, President, ous opportu- Greer College of Electrical Engineering, F Dept. 502, 2024 S. Wabash Ave., Chicago. nity, you have 7 nly © please send me full information and special offer for ourself to = electrical course. It is understood that I am not obligated in any way. personally, please. Erwin Greer, President. lame. Send and get full information by return mail. Name....

< he 25 H.P. Motor for student practice 2 Address PTITTTITITIT TT

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YOU ARE BADLY if you tack High School You cannot attain business or social prominence. You are barred from a successful business career, from the leading professions, from well- paid civil service jobs, from teaching and college entrance. In fact, em- ployers of practically all worth-while positions demand High School train- ing. You can’t hope to succeed in the face of this handicap. But you can remove it. Let the American School help you. FIT YOURSELF FOR A BIG FUTURE This course, which has been prepared by some of America’s leading professors, will broaden your mind, and make you keen, alert and capable. It is com- plete, simplified and up-to-date. It covers all subjects given in a resident school and meets all requirements of a High School training. From the first lesson to the last you are care- fully examined and coached, USE SPARE TIMEONLY Most people sdle away fifty hours a week. Probably you do. Use only one-fifth of your wasted hours for study and you can remove your present handicap within two years. You will enjoy the lessons and the knowledge you will gain will well repay the time spent in study. Check and mail the coupon NOW . for full particulars and Free Bulletin. American School Dept. H-575 Srexel Ave. and 58th $I., Chicago (2S CC PS SE MS Care OT Ce A Te a a American School Dept H-575 Drexel Ave. & 58th St., Chicago Send me full information on the subject checked and how you will help me win success. .,..Architect ease Building Contractor Automobile Engineer utomobile Repairman sda Civil Engineer pete Structural Engineer pinsee Business Manager ......Cert. Public Accountant ......Accountant and Auditor Law > Superintendent Manager anaes Bookkeeper «-....Draftsman and Designer Electrical Engineer »....Electric Light & Power General Education MONEY MAKING OPPORTUNITIES SECTION | them away. Moths Cost Ue Millions (Continued from page 33) out-of-doors in the hot sunshine fora day or two, if possible, before putting them away. If it will not hurt the material, press it with a very hot iron, using a wet towel on the goods. Soaking goods in boiling hot water for half a minute likewise will de- stroy moth eggs, and washing in a strong soap solution is effective. OR safe storage, cedar chests and cedar-lined closets are effective if they are kept shut tight. Open them only to put in and remove clothing. While the aroma of cedar kills the young worms, a cedar chest will not kill the millers or half-grown worms that are already in the clothing when it is stored away. The simplest precaution is to store your clothing in air-tight containers. Paper bags will do if you make sure that they are sealed tight and there are no tears, or protruding hangers, in them. Wrapping in several thicknesses newspapers is also effective. Plain paper does as well. Or, pack your clothes in pasteboard suit boxes and seal them. When your clothes become old, of give Every garment, especially if made of wool, hung on a hook at the back of the closet, is a fine home for moths. While you are giving things away, you might as well include the old stuffed fur- niture stored in the attic. One piece of it will furnish lodging for a thousand moths which, later, may explore more interesting regions downstairs. Look out for the furniture that is in use, too. F YOU have a piano, lift off the front and inspect the felt inside. This is a favorite hiding place for moths. Cold storage will prevent moths from attacking furs, but you can care for furs at home if you will brush, beat and air them thoroughly once every two or three weeks during the summer. Naphthalene in the form of moth balls or flakes will kill moths in all stages, but only if packed with clothes in a tight con- tainer. In a chest or trunk, allow one pound of naphthalene for ten cubic feet of space. Gum camphor fumes are de- structive to moths, also only when con- fined in an air-tight container. Should you discover a closet or room in- fested with moths, the best thing to do is to fumigate it with carbon disulphide or carbon tetrachloride, both colorless liquids which produce gases. Set a cupful of either liquid in a shallow pan on a shelf of the closet, shut the door, seal the cracks | with paper tape, and leave it over night. Carbon disulphide is the more powerful chemical, but it is inflammable. tetrachloride is not inflammable. Many methods formerly used for de- stroying clothes moths are useless, experi- ments have shown. Lavender flowers, pepper, powdered borax, salt, cedar chips, tobacco powder, and powdered sulphur are | among the time-honored moth chasers | While you are that do no real good. about it, you may as well use preventives that are known to work. And if vou see troublesome little clothes | noth millers flitting or crawling about j | this summer, swat them. Amazing little inven- tion actually anchors new kind of support. It weighs little more than acollar buttonand is revolutionizing the treatment of rupture. Sold on free examina- tion privilege. Results quick. Clean com. fortable. Why wear ox-harness when this remarkable new appliance awaits you? Write today for the most interesting free book you have ever read. The New Science Institute, 4024 Clay St., Steubenville, Ohio J Pay Him 40 ”A DAY! #0 Carbon | S. W. Allen of Californ’a made $40.80 in one day’s *‘joyful work’’! Hundreds of other men are report- ing amazing incomes— many of them doubling and tripling their former salaries. Just Wear This FREE Cap Just wear this beautiful hand tailored FREE RAIN- PROOF Cap. When j our friends see it, nine out of ten will want one like it: They can’t resist the Rain Proof idea—it’s so new and unique. You can make a splendid income in full or spare time. No experience is needed. “I haven't found a man who doesn’t fall for the made- to-measure idea.” writes Chas. Horstman. Sénd at once for FREE Selling Outfit. Taylor Cap Mfrs., Dept. E-107, Cincinnati, Ohio. Course for men of ambi- tion and limited time. Over 4000 men trained. Theoretical and Practical Elec- Electrica! Condensed course in trical including ngineering i: ly related subjects of Mathematics and Mechanical Drawing taught by experts. Students construct motors, install wiring, test electrical machinery. Complete Course. In One Year Prepare for your profession in the most interesting city in the world. School established 1893. Send for catalog. BLISS ELECTRICAL SCHOOL 495 Takoma-Ave., Washington, D. C. Local Demonstrator Wanted The marvel of the age, the only fireproof paint. Demonstrate on any vacant lot, thousands will come to see it. adcwes d by all fire departments. No talking necessary, no canvassing. Makes even the newspapers write about it. One of our special- ly prepared demonstrations sets the whole town talking. No money needed for stock. We ship on your orders and collect for you. Many make $15.00a day and not interfere with their present work. Write today before someone else gets your territory. Fire Chief Paint Co., 124 West Austin Ave., Chicago weezy SOUNDS IMPOSSIBLE After application of the magic liquid NOBURN you can stay in the hottest sun all day without any sunburn. Order bottle now. Pay $! later. NOBURN must make good before you pay. S:*rong, Cobb & Company, 348 Cen- tral Viaduct, Cleveland, 0. AA] 100 Agents Earn A Week () scuine Shirts. $1 00 $100 Weekly se lling bs 3 wearer. oes “peas OS Carlton, 5th } soy yy . Ame ric By "8 reste | shirt values, silks, chante s and exclusive pe | We deliver and collect. Your pro ‘a aid daily. Big, beautiful sample ord fit FR E. Permanent position. Sales men an \ Saleswomen write today for outfit. \ CARLTON MILLS, INC., = 98 FIFTH AVE. Dept. 86-C NEW YORK YORK $ 100 in Prizes See Cash Prize Offer on Page 4 in front advertising section te rns. 5 6 25 ~ p™. stal your he Here’s which g ance 0! duees t! danger’. self-den Take | New | The wonder belt you from 2 still, 3 thinne! same t disorde aches a genera saggil put bas are fil new en This the sa and ch you pl ment consté abdon fat sh The cally t fessior for its Satisf i

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com- this you? free ence Yhio ap RAIN: of ten 1 Proof plendid reeded. - made- énd at Mfrs., pacman SER umbi- paint. s will ments. ; even necial- town ts. pint Reduce This Fleshy Spo ON’T weaken yourself with starvation diets—don’t strain your heart with violent exercises. Here’s a wonderful new invention which gives you an instant appear- ance of slimness and quickly re- duces the actual fat—without any danger’. ee or disagreeable self-denial Take Off 2 to6 Inches With New Self-Massaging Belt The moment you put on this wonderful, new, self-massagin belt your waist is ‘instantly saan from 2 to 6 inches—but, better still, you should actuall: grow thinner day by day. At the same time all your stomach ; disorders, constipation, back- |." - aches and shortness of breath generally disappear as the sagging internal organs are put back in normal place. You are filled with a wonderful & .—— new energy and look and feel 10 to 15 years younger! Like Having a Private Masseur This new, wonderful Weil Reducing Belt produces the same results as an expert masseur—only quicker andcheaper. It not only reduces your waistline when you put it on, but is so constructed that every move- ment you make, every breath you take, imparts a constant, gentle massage to every inch of your abdomen. In a few weeks inches and inches of fat should actually disappear. The Weil Belt is made of the same kind of scientifi- cally treated rubber that is used by hundreds of pre- fessional athletes and jockeys and is highly endorsed for its healthful principles by physicians everywhere. satisfaction. guaranteed or your money instantly re- funded without question. The Weil Co., 105 Hill St., New Haven, Conn. SSCCCRERSERERERESSSSRESSEREESEEEEREERESERERESeeeeeee *THE WEIL COMPANY, $s 105 Hill St., New Haven, Conn. : Gentlemen: Please send me, without obligation, ‘complete description of the Weil Scientific Reducing «Belt and also your special 10-day trial offer. esesceuen ‘A £ ® RI oreo Seti eats Rua 8G Wat at ate re a's :City. ae : State. Ralivenccsneaehesheanbeesanhucaiubessubecveeneiuawe Clear stir. Shin. Your Skin Can Be Quickly Cleared of Pimples, Blackheads, Acne Eruptions on the face or body, Barbers Itch, Eczema, nlarged Pores and Oily or Shiny Skin. Write today for my FREE BOOKLET, E A CLEAR-TONE SKIN,” telling how r cured myself after being afflicted 15 years. $1000 Cash says I can clear your skin of the above blemishes. E.S.GIVENS, 153 Chemical Bldg., Kansas City, Mo. Learn at ome to mount birds, ani- mals, game heads; tan furs and robes. s Complete lessons. Easily an and quickly learned by men, boys and w Write for Pree. Tax E: Book. Tells cl 34 and Nature lover F chp eae, this » word a im ful fascinating art. ve your anes Bi, profits. success guaranteed. ad- Write for ig “4 MONEY MAKING OPPORTUNITIES SECTION _., 135 ianettwestern Sch eters Lit} Jol Terdermy 1785, Elwood Ble H Orel eb, kee. A. C. Course in pee Airplane En- gineering. Many men earn $2,000 to $10,000 a year. Big Free outfit of airplane parts. Write . for wree i. atalog. STERN AIRPLANE CORPORATION Dept. ys 5 Monadnock Bik. Chicago, Hl, fort (ATLAS M MoviNG PICTURE CO. He Lived Two Great Lives (Continued from page 18) “Well now, sir, I have tried you long enough. Now you have learned it is not numerous drawings, but the character of Scatter-brained! No wonder he never accomplishes | anything worthwhile ! | one that, makes a thorough draftsman. Finish one picture, sir, and you are a | painter!” It was with this fatherly advice in mind that Morse, on the day after the Sully arrived in New York in 1832, began at middle age his new career, and undertook the task of perfecting the first model of his telegraph. | E WENT directly to the home of his brother, and there, melting lead at the fireplace in the front parlor, pro- ceeded to spill the molten metal on the rugs and chairs, much to the consterna- tion of his brother’s wife. Next he moved to a little garret room on the fifth floor above a newspaper office run by his two brothers at Nassau and Beekman streets. This room served as his living room, kitchen, bedroom and workshop. On one side of the room was his small cot; on the other side a lathe on which he turned brass apparatus used in building his instruments. Here he toiled feverishly and_inces- santly. Here was repeated the old story of inventive genius contending with pov- erty. His funds had been exhausted in Europe. He was compelled to live on the plainest of foods prepared with his own hands. To support himself, he had to fall back on his paintbrush and to earn his bread by giving lessons in art. His friends called him “visionary”; others called him a “mad prophet.” His hands were little accustomed to the mechanical labor which he was under- taking. No electrical apparatus was available for his use; all of it he had to make himself. He whittled models for his apparatus from wood; then from the models made molds and castings. In designing his “recording telegraph, his problem was to utilize the simple up and down motion of opening and closing an electric circuit to write an intelligible message at one end of the wire and at the same time record it at the other. IS solution was ingeniously simple. First, by means of clockwork, he caused a ribbon of paper to move hor- izontally beneath a pencil. The pencil moved up and down. When it touched the paper it made either a dot or a dash, according to the length of time it re- mained there. When lifted from the paper, it left a blank. Each of the vari- ous combinations of dots, dashes, and blanks represented a letter. The move- ments of the pencil were produced by an electromagnet actuated by a type rule or key which opened and closed the electric circuit according to the combination of dots and dashes desired. Three years after the inception of his idea aboard the Sully the first rude telegraph apparatus was completed. Its birthplace was in the University of the City of New York, where Morse had been called as professor of arts and design. It worked! At the university, in 1837, Morse demon- (Continued on page 136) voy ae al gt wel atte &y ‘candi . cael "7 oar /t “yeep 12ND Syiey D IS mind is a hodge-podge of hi ilf-baked ideas. He thinks of a thousand ‘‘schemes” to make — quickly—but does nothing about any of them Thoughts flash into and out of his brain with the speed of lightning. New ideas rush in pell-mell, crowding out old ones before they have taken form or shape. He is Scatter-Brained. He wonders why he does not get ahead. He cannot understand why others, with less ability, pass him in the prosperity parade. He pities himself, excuses himself, sympathizes with himself. And the great tragedy is that he has every quality that leads to success—intelligence, originality, magination, ambition. His trouble is that he does not know how to use his brain. His mental make-up needs an overhauling. There are millions like him—failures, half-successes— slaves to those with balanced, ordered minds. It is a known fact that most of us use only one-tenth of our brain power. The other nine-tenths is dissipated into thousands of fragmentary thoughts, in day dream- ing, in wishing. What can be done about it? Find out Dy means of Pelmanism; then develop the particular mental faculty that you lack. You can develop it easily; Pelmanism will show you just how; 550,000 Pelmanists, many of whom were held back by your very problem, will tell you that this is true. Pelmanism is the science of applied psychology, which has swept the world with the force of a religion. It has awakened powers in individuals, all over the world, they did not dream they possessed. Among those who advocate Pelmanism are: T. P. O'Connor, House of Commons.” The late Sir H. Rider Haggard, Famous Novelist. | Imperial General Staff. General Sir Robert Baden-Powell, | Admiral Lord Beresford, Founder of the Boy Scout | | G.C.B., G.C.V.0 Movement. | Sir Harry Lauder, Comedian. Judge Ben B. Lindsey, Founder of | W. L. George, Author. the Juvenile Court, Denver. | Baroness Orczy, Auttor. Frank P. Walsh, Former Chairman | Prince Charles of Sweden. of National War Labor Board. | -and others, of equal prominence, mention here. A remarkable book called ‘Scientific Mind Training has been written about Pelmanism. It can be obtained free. Yet thousands of people who read this announce- ment and who need this book will not send for it. “It's no use,” they will say. ‘“‘It will do me no good,” “It’s all tommyrot,’’ they will tell themselves. But if you are made of the stuff that isn’t content to remain a slave—if you have taken your last whipping from life,—if you have a spark of Independence leit in your soul, write for this free book. It tells you what Pelmanism is, what it has done for others, and what it can do for you. The first principle of your success is to do something definite in your life. You cannot afford to remain un- decided, vacillating, day-dreaming, for you will soon again sink into the mire of discouragement. Let Pel- manism help you find yourself. Mail the coupon be- low now—while your resolve to do something about yourself is strong. THE PELMAN INSTITUTE OF AMERICA Approved as a correspondence school under the laws of the State - New York 19 West 44th St. Suite 875 New York City The Pelman Institute of America, 19 West 44th St., Suite 875, New York City. | want you to show me what Pelmanism has actually done for over 550,000 people. Please send me your free book, ‘Scientific Mind Training.’’ This places me under no obligation whatever. “Father of the; Jerome K. Jerome, Novelist. G2n. Sir Frederick Maurice, Di- rector of Military Operations, too numerous to ” Name. Address.

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MONEY MAKING OPPORTUNITIES SECTION “I was kicked into selling by my boss”’ Harry Jordan was talking to his old friend Bill Thompson, whom he hadn’t seen for years. “ Bill, you know I worked on inside detail jobs for five years, and I couldn’t get beyond $100 a month to save my soul. I was pretty much discouraged. “One night the chief took me to dinner with him, and asked me how I'd like to try sales work. I told him I didn’t think I could do it. But he said he’d back me to the limit, and knew I could make good. Said the best silesmen the firm had came up from the ranks just like me. He had more faith in me than I had in myself. “Well, Bill, we tried it, and it was the best thing ever happened to me. Now I’m mak- ing $500, $600, or $700 a month regular, and the day isn’t far off when I’ll be hitting around $10,000 a year.” Why Don’t YOU Become a Salesman? Don’t wait for the boss to “discover”? you and kick you into a big-money job. That wastes too much time. It’s no longer neces- siry to blunder in sales work either. Send the coupon below at once, and find out for yourself what amazing results can be se- cured by the Federal System of Sales Training, fully described in this book “The Vital Spark in Business.’’ Please state age and occupation. 4 of Salesmanship 352 Federal Schools Bidg., Minneapolis, Minn. Te 2 2 8 8 Oe 8 OE OS OE UG Ue UU UE UG UG UG UG Please send your book, ‘‘The Vital Spark in Business. Age... .Occupation. . Write your address plainly in margin “STAMMERING’ lfs G@use and Gire % You can be quickly cured if you stammer. Send-10 cents, coin or stamps, for 288 page cloth bound book on Stammering and Stuttering. It tells how I cured myself after aren ne — ring for 20 years. BENJA E 7529 Bogue Bidg.. 1147 N. un, ris indianapolis gE DRAW CARTONS Turn Your Talent Into Money Cartoonists earn from $50 to $300 per week—some even more. Remarkable new Circle System of Drawing teaches you in half the usual time. Send for booklet and sample lesson plate ex- plaining full details of the Course. THE NATIONAL SCHOOL OF CARTOONING 615 Penton Building Cleveland. Ohio He Lived Two Great Lives (Continued from page 135) strated his invention to an astonished group of scientists, transmitting tele- graphic signs through 1700 feet of wire strung back and forth across the room. The same year he applied for a patent at Washington for the “American Elec- tromagnetic Telegraph.” Another year brought the first public demonstration and the successful transmission, over ten miles of wire, of the first sentence ever recorded by telegraph: * Attention, the Universe! doms, right wheel!” O MORSE, it seemed as if the final triumph for his labors must be just ahead. He had added a number of im- portant improvements to his apparatus. He had invented the electric relay, one of the most brilliant of all his achieve- ments, which made possible transmission through infinitely great distances. In his code, he had replaced the original numbers with letters of the alphabet. And, not the least important, he had en- listed the interest and financial support of a young student in the university, Alfred Vail, the grandfather of the late Theodore N. Vail, founder of the Ameri- can Telephone and Telegraph Company. With high hopes, he was encouraged to go to Washington to ask the support of Congress for the construction of the first telegraph line. There, in the Capitol, he set up his apparatus and demon- strated it before President Van Buren and his cabinet, members of Congress, foreign ministers, and men of science. And finally he submitted a memorial to Congress for an appropriation of $30,000 to establish an experimental telegraph line. By king- HIS done, hé hurried to Europe to obtain foreign patents, leaving his American affairs in the hands of friends and supporters. In England his mission failed, but in France his invention created a sensation. There he was hon- ored by foremost scientists of the day. Returning in 1839, he was full of con- fidence that his own country would support him with equal enthusiasm. But he had not figured on the apathy of his public, of Congress, and even of his friends. No sooner had he landed in New York than he found all his hopes dashed to the ground. In two years Congress had failed to act. His friends were scattered. He found himself stranded in New York without a cent, compelled to borrow money even for a meal. Plunged to the depths of disappointment and want, he turned again to his easel and his brush for a living. Again he became a teacher of art. One day, to a pupil whose quarterly payment for instruction was past due, Morse remarked: “Well, my boy, how are we off for money?” “Professor, I'm sorry I have been dis- appointed,” the pupil replied, “but I expect the money from home next week.” *“Next week!’ Morse exclaimed. “I shall be dead by that time!” “Dead, sir?” May, 1926 LEARN BY DOING Every phase of all ranches ELECTRICITY taught by Actual Practice In America’s foremost and oldest institution for trade training No Books Used Individual Instruction Start Any Day Write for FREE 64-page catalog THE NEW YORK ELECTRICAL SCHOOL 40 West 17th St., New York City Amazing New invention No knowledge of snueic essons. No expensive or FREE book, Me. - musical instrument Halsted, Dept. 8785 Chicago I Made'2]% In FiveHours —Writes Peter Werner, III. Sell Madison “Better - Made” Shirts for Large Manufacturer Direct to wearer. No capital or experience needed. Many earn $100.00 weekly and bonus. Write for Free Samples MADISON SHIRT M’FRS, 562 Groadway, New York Make Your Mind an index from which you select facts, figures, names, faces. velop concentration, control: overcome bashful- ness, forgetfulness. today for F and concentration test and\\ illustrated booklet, to Remember.’ PROF. HENRY DICKSON Dept. 929, Evanston, Il. “How (Continued on page 137) _Z PREVENTS ACCIDENTS SENSATIONAL money-maker. Rhan- ney sold 108 in few days, now orders 1000 4 month. Magic new glare shield banishes fear of night driving. Dims blinding headlights. Same natural principle as shading eyes from sun—yet full vision. Over 100,000 Sold ~— Many Make Fits any car. Owner can install. Noth ing to get out of order. Handsome orn $25 ment. Amazing low price, yet highes 4 commissions. Startling demonstratio® A Day sells eat Big demand proved by wed 100,000 sales. Exclusive rights clos “4 fast. Learn unusual automatic profit plan. Write quick! LEE-SEE CO., Dept. 65, Kewaunee, Wisconsin May.

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| He Lived Two Great Lives (Continued from page 136) “Yes, dead, by starvation.” “Would ten dollars be of any service?” “Ten dollars would save my life,” said Morse. “That’s all it would do.” The youth paid the ten dollars, the last he had, and they dined together. When the meal was ended, Morse said: “This is my first meal in twenty-four hours. My boy, don’t be an artist. It means beggary. A dog lives better.” In a final desperate effort to arouse public interest, Morse planned the first public demonstration of a submarine telegraph. He announced that he would string a line under water between Castle MONEY MAKING OPPORTUNITIES SECTION

Garden in New York and Governor’s Island, and that on a certain day the public could witness the exchange of messages. Doubters were invited to attend the demonstration. HE night before the test, Morse hired a rowboat and laid the cable himself. Early the next morning a crowd assembled at the Battery to witness the new wonder. Morse, at his instrument, exchanged a few signals with his associate at the other end on Governor's Island, when suddenly the line went dead. Looking out over the water, he quickly saw what the trouble was. Above the cable during the night a number of ves- sels had anchored. One of them, in raising anchor, had pulled up the cable with: it. The mystified sailors, after hauling aboard 200 feet of the wire and finding no end to it, had cut it off and sailed away. The crowd on shore jeered. But still he refused to be beaten. As a last hope, he appealed to his associates for funds to go to Washington again for government aid. For reply, he received good wishes and nothing more. Notwithstanding, Morse went to Wash- ington. How he did so is not recorded, but again he placed his invention in the

Capitol. Day after day he stood there explaining, sometimes almost tearfully, its mysteries to indifferent congressmen. Some believed in him. Others scoffed. HE appropriation bill of $30,000 for the telegraph was introduced. But the weeks dragged by, and no action was taken. And then happened one of those strange miracles which time and again have come to reward inventors who have refused to quit. In the closing hours of the session, at the moment when all hope had gone glimmering, the appropriation passed both houses of Congress! Morse, who now had less than a dollar in his pocket, was selected to superintend the construction of a forty-mile telegraph line connecting Washington and Balti- more. Within the year the line of poles and wires was completed. May 24, 1844, was the day for the test of the experiment on which Morse had labored for twelve years. Seated at his instrument, surrounded by high govern- ment officials, the inventor flashed to Vail in Baltimore the famous message: “What Hath God Wrought!” The artist-inventor’s greatest master- piece was finished: ie

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ELECTRICAL EXPERTS IN DEMAND Good positions await trained men Salaries of $12 to $30 a day not unusual Tue Exvectricat feld needs men. It needs them badly. Hardly a week or month passes but what some new use for electricity 1s dis- covered. Each new use means new positions— better positions —for men who have trained themselves as experts in this wonderfully fascinating work. Why don’t you study electricity and pre- pare for a good position at a good salary? You can do it right at home in spare time through the International Correspondence Schools. Best electrical home-study courses ever offered. Endorsed by Edison and Stein- metz. Successful students everywhere. Mark and mail the coupon today for descriptive booklct ee — TEAR OUT HERE INTERNATIONAL CORRESPONDENCE SCHOOLS Box 7690-D, Scranton, Penna. Oldest and largest corres :ondence schools in the world Expiain, without obligating me, how I can ee for the position, or in the subject, before which I mark ELECTRIOAL ENGINEER OHEMICAL ENGINEER Electrician Pharmacy (J Electric Wiring SALESMANSHIP Electric Lighting ADVERTISING MAN Window pea Electri H eats Sit Running Show Card and Sign Paint’g Heavy Electric Traction Electrical Draftsman RAILROAD POSITIONS (_] Electric Machine Designer pean ATOR Fee a pee el BUSINESS MANAGEMENT [] MEOHANIOAL ENGINEER Private Secretary Corr ip BOOKKEEPER Stenographer and Trpis« ert. Pub. Accountant Traffic Managemen: Commercial Law GOOD ENGLISH STATIONARY ENGINEER Mechanical Draftsman Machine Shop Practice Toolmaker Gas Engineer CIVIL ENGINEER Surveying and Mapping Lj] Mining Engineer ARCHITECT CIVIL SERVICE Architectaral Draftsman Railway Mail Clerk Architects’ Blue Prints Textile Overseer or Supt. PLUMBING AND HEATING AGRICULTURE Sheet Metal Worker Ronit yeatash Spanish o Navigator Automobile RADIO Name. 4-30- Present Business _ Occupation Address Street and No City. State = N sh! ° Me caw toDraw Cartoons When Shown in the RIGHT WAY Some of the cleverest cartoonists and comic artists learned how to draw in their spare time by followin Cartoonist Evans’ Simple and aw to Learn Metho and are now MAKING GOOD MONEY. Send one of your drawings, and let Mr. Evans see if you have ability and receive the Portfolio of Cartoons and full details about the course. It is not expensive. THE W. L. EVANS SCHOOL OF CARTOONING 825 Leader Building Cleveland, Ohio MONEY MAKING OPPORTUNITIES SECTION May, 192% the example of his comrades, he entered into the life of the camp with zest. He left camp a remade man, and when the camp opened last year he was almost the first one to enroll. In one short year he had accomplished more than he had in the rest of his life, for he was making a conspicuous success as a salesman and was almost ready to embark in business for himself. To him his first sojourn in a summer camp was the turning point in his life. “Cases like these, and they are legion, make the summer camps well worth the money they cost the Government and the effort they cost the army officers who con- duct them. They supply one reason, too, for the success of the camps, for men who have been benefited by them are bound to tell others and instil in them a desire to attend. For the last few years, almost twice as many as can be accommodated have applied for admission to the camps.” HE citizens’ military training camps offer four courses of instruction—the basic, or first year, course, for which no military experience is required, and then the Red, White and Blue courses, which give graduates of the basic course pro- gressive training for the various arms of the military service. A candidate who completes the Blue course may be com- missioned a second lieutenant in the officers’ reserve corps. The basic course has a minimum of military training and a maximum of athletics and recreation. It is open to men between the ages of seventeen and twenty-four years, who are American citizens or who have taken out their first naturalization papers, and who are of good moral chafacter. They must be physically fit, but the requirements are lower than the regular army require- ments. A month in a citizens’ military training camp costs you nothing. The Govern- ment pays your railroad fare from your home to the camp, and back. Uniforms are provided. Bedding, food, laundry and medical attendance all are free. All you need is a modest supply of spending money. Let’s take a swift glance at a typical day in a “basic”’ camp. The bugle turns you out at a quarter of six in the cool of summer morning. Dressing, shaving, and tidying up quar- ters fill in the half hour until breakfast. And a good breakfast it is, for the War Department, realizing that growing youngsters who are getting lots of exercise and fresh air need plenty of good food, allows the camp authorities seventy cents a day for your rations, which is more than the regulars get. After breakfast, tents and company streets are put in apple-pie order for inspection. T HALF past seven, the real work of the day starts with a close-order in- fantry drill that lasts for three quarters of an hour. Close-order drill does more than teach you to get from here to there in certain formations. It teaches you how to manage hands and feet and head, and The Army and Your Boy (Continued from page 27) how to obey promptly without stopping to argue about it. A perfectly per. formed “squads right’ may bring a thril] to the heart of no one but a drill sergeant, but it’s a lesson in teamwork. And teamwork is as valuable out of the army as in it. There is a ten minute rest after the drill, then a lecture for three quarters of an hour on citizenship. Next come tw enty minutes of snappy calisthenics, after which you're content to sit down and listen toa lecture on hygiene. This is followed by a talk on military tactics—and then it’s time for another meal. WO hours of every afternoon are set aside for sports. You are encour- aged to bring your baseball, tennis, and swimming equipment to camp, for you must play some game. You may pick your own sport, but if you have no favor- ite you must take part in group games. All the camps have facilities for swim- ming, which is carefully supervised. The men always swim in pairs, so that no one ever is alone in deep water. More team- work! Sport contests between com- panies arouse tremendous rivalry. Rifle shooting is a military exercise | that has much recreational value. Ameri- cans like to shoot, and every American is confident that he has an inborn ability for handling a rifle. Sometimes this con- fidence disappears after a half hour on the rifle range, but many of the candi- dates make remarkably good scores. After the period for athletics comes the “high hat” event of the camp day— retreat. The companies drawn up on the parade ground present arms while the band plays the “Star Spangled Banner” and the flag flutters slowly down the staff. Then it’s time for another meal. Your evenings are your own, provided you are back in camp by half past nine. Musical instruments are encouraged, and song is a universal habit. Taps sounds at ten o'clock, but there are usually few awake to hear the last call’s long-drawn notes. After a month of that s fellow has just got to feel fit! sort of life, a HE United States is divided for mili- tary purposes into nine corps areas. Each of these areas will have its citizens’ military training camps this summer. Their dates for opening vary slightly, but most of the camps will be held in August. Forty-four camps, scattered from the Canadian to the Mexican border and from the Atlantic to the Pacific, will receive the 35,000 young Americans who will benefit from a month of healthful outdoor life under expert supervision. If you decide that you want to be one of these 35.000, you had better act promptly. Write to the C.M.T.C. officer, at the headquarters of your corps area, for an application blank. The local recruiting officer will tell you how to address your letter. Applications are accepted in the order in which they are received and approved. Last summer 57,000 men applied for the camps, but only 33,500 could be accepted. a

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1926 nili- eas. ens ner. but ust. the rom eive will Joor one act ee your ank. you jons they ymer but

May, 1926

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Radio Builders Win Prizes (Continued from page 61) No. 5 to No. 4 and. continue it around past binding post No. 2 and _ filament switch S, and connect the end of it to the rotary plate terminal of condenser D. Run branches from this wire to binding post No. 2, the upper end of coil A, the lower end of coil B, and one terminal of filament switch S. Now runa wire from the remaining terminal of filament switch S to one filament terminal of each of the

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Figs.5 and 6. Front panel and sub-panel lay- outs. It might be necessary to alter arrange- ments somewhat to suit the parts you use sockets LL, M, and N. It makes no difference which filament terminal you choose. Connect one end of coil C to this wire at the nearest point. Connect binding post No. 3 with No. 8 and run branches from this wire to one terminal of each of the rheostats I, J, and K. Then connect the remaining terminal of each rheostat to the remaining filament terminal of the socket nearest to it. Note that the center socket M is connected to rheostat J, which is mounted on the front panel 7.

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oli. Fig. 7. The sub-panel brackets. This design is correct for vertical panel mountings. If you build your set with a sloping-panel cabinet, you will have to bend the brackets to correct shape You have now completed the filament wiring, and it would be a good idea at this point to insert the tubes ia the sockets, connect up the A battery and see if the filament switch S and the rheostats /7, J, and K all work properly. Next connect the top end of coil B with the terminal on the stationary plates of variable condenser D and run a branch from this wire to the nearest terminals of grid condenser FE and grid leak G. The other two terminals of condenser FE’ and grid leak G should be connected together and to the grid (Continued on page 140)

139 Great Inventors Now Teach You How to Invent Edison Says Invention is a Science and Should be taught as a Profession Thousands of inventions are needed today. Just one little idea ean bring you fortune and fame. The world is waiting for new inventions in engineering, chemistry, household articles, radio, and other fields —and will: pay big money for even the simplest idea. Little things like the tin bottle cap, the crimped hair-pin, the rubber on the end of a_ pencil brought their inventors hundreds of thousands of dollars. Couldn’t you make some equally simple invention? Haven't you ideas that could be turned into money? Inventing isn’t a matter of blind luek—it isn’t a question of guess- work. Invention is based on certain principles, just as any other profession. It follows a defi- nite course of procedure step by step from the origination of the first idea to its final develop- ment on a2 commercial seale. Learn at Home in Spare Time Hitherto, every inventor had to work out these principles of invention for himself. For every successful inventor knows and uses these principles. He knows WHAT TO INVENT and HOW TO INVENT. But now you ean learn in a few months what it took great in- ventors years of discouragement and terrific struggle to acquire. Raymond F. Yates, who, with fourteen other famous inventors, has now revealed, for the first time, the secrets of invention. They explain how to originate ideas, how to develop and perfect your ideas, how to patent your inventions, and how to sell them to your best advantage. In short, they make it amazingly easy for you to become an inventor, simply by learning the whole wonderful science of inven- tion, step by step, from beginning to end. It requires just fascinating moments of your spare time at home. First Course of Its Kind This is the first course in practical Invention that has ever been devised. Now you can take Edison’s advice and actually learn HOW TO IN- VENT—how to make Invention a profession. In simple, easy-to-understand language, you are told how successful inventors work; you learn how to use the secrets of invention that convert a simple little idea into money. New Book

Raymond F. Yates

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Many earn $3,000 to $10,000 a year. Prepare ‘Also earn while you learn w

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Radio Builders Win Prizes (Continued from page 139) binding post of socket 4. Now connect the P binding post of socket M with one terminal of fixed condenser F and the P terminal of audio transformer 0. Con- nect the remaining terminals of condenser F and coil C together. The B plus terminal of transformer O should be connected to binding post No. 6, and the G terminal of the transformer should be wired to the G binding post of socket L. Now connect the P binding post of socket LZ to the upper lug of jack Q; the

Pp rt) | R = L N oH c K | fam 8

3 a 7 & +B DET. +B AMP +C 22%V = 90V. 1 2% 3 9 ANT. -B =C Fig. 8. Theoretical wiring diagram. You will find pictorial wiring diagram on page 61 second lug on this jack with the P termi- nal of transformer P; and the third lug Rand continue it over to binding post No. 7 Next connect the G terminal of trans- former P with the grid binding post of socket N and connect the plate binding post of this same socket to the remaining terminal of jack R. Complete the wiring by connecting the P together and run a branch from this wire to binding post No. 9. HERE are two good ways to fasten the receiver into the cabinet. You can drill holes in each corner of the front panel T, using wood screws, or you can bolt the receiver into the cabinet by drilling holes through the bottom of the cabinet and the lower arm of each of the sub-panel brackets V and W. The latter method was used on the prize set and is excellent be- cause it eliminates the extra screws on the front of the panel. It can be done conveniently only if there is sufficient space inside the cabinet at each end so that you can use a screw driver. To put the receiver into operation, con- nect up the antenna and batteries as shown. adjust rheostats H, J, and K until the tubes glow dimly. The dial should be mounted on the shaft of condenser D so that it reads 100 when the plates are fully engaged. Turn the dial on the shaft of

| coil C until a click accompanied by a _ slight hissing noise is heard. Then turn _ it back until the noise stops and turn the

dial on condenser D until you hear the broadcasting from some station. Imme- diately stop turning the dial and adjust all the rheostats to the lowest glow in the tubes that will give you full signal strength. Readjust both dials until the signal is as loud and clear as possible. You must be absolutely sure that you al- ways operate (Continued on page 141)

44V. MONEY MAKING OPPORTUNITIES SECTION

with the B plus terminal of the same | transformer. Run a wire from the bottom | | lug of jack Q to the bottom lug of jack | F minus terminals of transformers O and | Turn on filament switch S and |

May, 1926

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il on ly for 10t May, 1926 Radio Builders Win Prizes (Continued from page 140) your receiver so that it does not oscillate. The best antenna for use with this set isa single wire about 100 feet long and as high as possible. If you are located where an antenna of this length is impossible, use the longest antenna your local condi- tions will permit; and then if the broad- casting seems weak or the receiver tunes too sharply, increase the number of turns in coil A until you strike the right balance between selectivity and ability to bring in stations with volume. If you run into any difficulties either in the construction of the set or in getting it to operate properly, first check up your wiring very carefully, then make sure that your batteries and tubes are good. Then, if you are still unable to locate the trouble, write to the Radio Editor of PopuLAaR SCIENCE Monruty, and be sure to state your troubles as fully as possible. Power for the Holy Land MONG many schemes for the de- velopment of Palestine is one for utilizing the Dead Sea, which is about 1300 feet below sea level, as a source of water power. The plan, while startling, is not theoretically impossible, it is claimed by its proponents. If, it is arg- ued, power can be obtained from water running down to the ocean, it could like- wise be taken from water coming in from the ocean, if there is a lower basin to receive it and an outlet for the surplus. The Dead Sea provides the basin, and the sun which drinks up the River Jordan as fast as water runs in, engineers say, would draw up enough water from the Dead Sea to prevent a possible overflow. This scheme would provide over 600,000 horsepower for the electrification of the Holy Land. A Monkey Experiment ONKEYS in cages are generally saucy, ill-mannered beasts. Pro- fessor Pfungst, of the Berlin Physiolog- ical Society, thought that this was due, perhaps, to association, and determined to raise a monkey without any monkey companions. The monkey was _ well- mannered from birth. For four years he saw practically no other creatures except man. He could not bear being shouted at or stared at. He yawned when angry. He never laughed nor cried. Then he was introduced to another monkey. At first he was afraid, but his courage gradually increased and soon he was like his companions. Proper Food Lessens Disease HE connection which exists between a faulty diet and disease is well illus- trated by the Arabs, Dr. Hindhede, the best-known food expert in Denmark, de- clares. The Arabs in the desert live large- ly on figs, dates, vegetables and a little milk. Meat is eaten rarely. Despite the filth in which they live, they are more immune to disease than Europeans, he says. But when these Arabs desert their dirty villages for the towns, to live like Europeans, eating the food Europeans do, they become sus- ceptible to all the diseases to which Europeans are subject. MONEY MAKING OPPORTUNITIES SECTION 141 “Did you know that two-thirds of all men past a certain middle age suffer with a certain seldom mentioned dis- order? “By the medical profession this is known as hypertrophy of the prostate gland. And scientists have now re- vealed that it is directly responsible for much of what many people mistake for actual old age.’’ NEW HYGIENE But no longer should men approaching or past the prime of life put up with these painful and em- barrassing conditions due to this cause. For a well known American scientist has discovered a new, safe home treatment for this gland trouble—a new kind of hygiene that goes right to the seat of this trouble, often bringing new pep and vigor to the entire body, MIDDLE AGE AILMENTS Here is usually quick relief for such distressing ailments as sciatica, aches in back, legs and feet, A Test Every Man Past 40 Should Make FREE The coupon herewith will bring you FREE a vitally interesting booklet which will en- able you to ask your- self certain questions which show you the true state of your physical condition. Fill out and mail the cou- pon immediately. Amazing New Facts About Old Age nervousness and irritability, when due to enlarged prostate. Twenty thousand men testify to the value of this treatment. FEEL TEN YEARS YOUNGER IN SIX DAYS OR PAY NOTHING So successful have been the results of this new hygiene in thousands of cases that the discoverer offers to send it to any man under the amazing guarantee that unless you feel 10 years younger in 6 days you pay nothing. There are no drugs to swallow—no exercises, diets or lessons. ALL EXPLAINED IN FREE BOOK If you are troubled with any of the disorders mentioned, if you have chronic constipation or this trouble, you should send for a vitally inte resting free book, written by this scientist called, ‘‘Why Many Men Are Old At 40.” It describes this ‘splendid treatment and shows how you may often regain much of your youthful vigor and be free from certain dis- orders. No obligation. Simply fill out and mail the coupon below. W. J. KIRK 4057 Main Street Steubenville, Ohio Fett ese ees eee eee ee eee eee a MR. W. J. KIRK Bony 40-Z, 711 Van Nuys Bldz.. Los Angeles, Calif. 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Send coupon ~— for FREE BOOK—“Rich Rewards in Radio.” Read for yourself. No previous experience need- ed. Common schooling enough.W RITE NOW Receiving sets, from the Pm 0 kind to thou- sand mile receiver, included to help you learn. An UNEQUALLED OFFER. Other special features for limited time only, so Act Quick! NATIONAL RADIO INSTITUTE Dept. ET-9, Washington, D. C. MAIL COUPON National Radio Institute, Dept. ET-9, Washington, D. C. Without obligating me in any send me your free book, way, please “Rich Rewards in Radio,” also complete information on your practical, home-study Radio course. Name... oe Address...... Town .. State MONEY MAKING OPPORTUNITIES SECTION May, 1926 _ there isn’t any such thing as best. How to Pick the Best Car in Its Class (Continued from page 66) be sure that the brake and clutch pedals work easy. It doesn’t make much differ- ence whether Grace can reach the pedals or not. You can fix that by putting a cushion behind her back. In fact, it would be better to pick a car with plenty of leg room so you won’t feel cramped on long drives.” *“What’s the dope on overhead valves, uncle? Are they really much better?’ HEORETICALLY they are—all the racing cars use them,” replied Gus. “But in a car for ordinary use I can’t see that there’s much advantage. They may result in a slight saving of gasoline as compared with the ordinary valves that are placed in a pocket beside the cylinder head. Also, with overhead valves, you can take the cylinder head off and remove it to a warm place in the cellar when you want to grind the valves instead of working in a cold garage. On the other hand, overhead valves usually are noisier, and as there are more parts in the valve mechanism, there is more to replace when things begin to wear.” ““Humph!” exclaimed Henry. “It sure is a hard job to pin you down to a definite opinion as to what is really the best!” Gus smiled. “For the darn good reason, son, that The fact that there are so many different ways in which gasoline motors are made shows that the designers can’t agree. Whenever there are two ways to make a | piece of machinery, there are always good _ arguments for either way, and you'll have | to decide for yourself which of these ways fits in best with your way of doing things.” “Do you think a car with four-wheel brakes is safer, uncle?” questioned Henry as he stooped down to inspect the front- wheel brakes on one of the exhibition cars. * ON’T worry your head over four- wheel brakes,’ advised Gus thought- fully. “I’ve fixed a powerful lot of brakes, and as far as I can see, there isn’t much in this four-wheel business as com- pared with one real good pair of brakes on the rear wheels. Four-wheel brakes are fine in theory, but durned few of the out- fits that I've looked over were working right, and on the low-priced cars Pm in- clined to think that their disadvantages just about make up for their advantages.” “They say you can stop quicker with *em,” Henry argued. “You can if they are adjusted right; but you have to be careful not to have the front-wheel brakes too tight or they might lock if you jammed on the brake pedal too hard. And if the front wheels lock, son, you are mighty likely to get into a nasty front wheel skid. Mind you, I’m not sug- gesting that you don’t buy a car with four-wheel brakes. The point is, I would- n't consider them a feature that would influence me to buy some particular make of car that was no better in other ways than another that did not have them.’ “Those wheels look pretty solid,” ob- served Joe as he directed their attention to a sedan equipped with disk wheels. “Sure they're solid,” grunted Gus. “Why shouldn't they be—made of metal the way they are? As far as I can see, about the only advantage of disk wheels is that you can keep them clean easier than the wood wheel. On the other hand, you have to take your wheel off or else crawl under the car ev ery time you want to adjust the brake bands. You can't work between the spokes as you can with wood wheels.” “But, uncle, they look so spiffy!” urged Grace. ND we've just got to be stylish!” observed Gus sarcastically. “All right, Henry, let her have the disk wheels if she thinks them classy. You can take the extra amount out of her allowance!” “That's not fair,” said Grace, pouting. “Get your old wood wheels if you think they're just as good.” Henry was collecting catalogs right and left. “I'm going to study these over mighty carefully when we get home,” he said, as he vainly attempted to stuff another large folder in a pocket that was already crammed full. “That’s a good idea,” Gus agreed. “While you're here, you and Grace had better sit behind the wheei of every car in your price class so as to get a line on whether there’s enough leg room. Work the pedals, and see if the gear shift lever is handy. Watch out for any car that has a gear lever that slides up under the dash when you go into reverse. It'll take all the skin off your knuckles if you have to back up in a hurry. “Suppose Joe and I leave you now for a while,” Gus concluded. ‘We want to look over some of the accessory ex- hibits. We'll meet you at the door in about three quarters of an hour.” “Why can’t we look over the accesso- ries, too?” asked Henry. * Nothing doing!” Gus ordered. “You stay away from the accessories or you'll end up by fitting that new car with more junk than it will carry. No, sir! All you need in the way of accessories—at least to start with—are front and rear bumpers, a rear Vision mirror, a windshield wiper and a spare tire!” DON’T want to butt in, Gus,” said Joe when the young couple were out of hearing, “but it kind of seems to me that it would be a good idea if Henry bought a second-hand car. He barely knows how to drive, and Grace never even has learned how. They are bound to do a lot of rotten gear shifting, and the chances are that they will run into a lot of minor accidents the first year. And if they're going to bust things up it might better be a second-hand outfit.” “That’s all true,” said Gus. “At least it would be in any ordinary case. But Henry is careful and he’s the kind of a bird who can’t seem to take pride in any- thing unless it’s just right. He'll take much better care of a new car than he would of an old one. Besides, if he got a second-hand car, I'm afraid the Model Garage would have to do a lot of free repair work this year!’’ he concluded with a chuckle. ang né ti m ci th of th Ww in ag of in Ww su m th pl at th m | ar | br al th cl | th Wi

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ll ls e ” aS sh il] to id ut ne ry ly er to he of if ht ast ut a 1V- ke he ta del ree led May, 1926 POPULAR SCIENCE MONTHLY 143 Here Are Correct Answers to Questions on Page 43 1. The heart tends to keep time with any strong rhythm that you hear. Ordi- narily one’s heart beats about seventy times a minute. The rhythm of a fast march makes your heart ‘beat a little faster, the faster heartbeat improves circulation and makes you feel more active. 2. Alcohol was used a good deal, also the juices of certain plants like opium. The ancient Egyptian surgeons had a way of hitting the patient on the head in just the proper place and then operating while he was unconscious from the blow. 3. It is water which has been turned into steam and then condensed into water again. The process leaves behind some of the impurities which cannot be turned into steam. The distilled water is there- fore purer. 4. Many of the sun spots remain for weeks in about the same place on the sun’s surface. We can see these spots move as the sun turns around on its axis. 5. Yes. It attracts the water just as the moon does, but less strongly, because it isso much farther away. Even the other planets have an attraction on the water and affect the tides. 6. Froth is made up of thousands of tiny air bubbles each one surrounded by a film of white of egg. White of egg makes a better froth than water because it is tougher than water and the films around the air bubbles in the froth do not break so easily. 7. When a wave rushes up the beach and breaks, the water has to run back into the ocean. Meanwhile another wave climbs on top of the water running back. On the top of the water you see a wave advancing toward the shore, underneath there is a seaward-flowing current of the water belonging to the previous wave. 8. First he surrounds himself with a protective coating woven like a spider web, called a cocoon. Inside this all his internal organs disappear. His body becomes a mere lump of matter in which the beginnings of the body of the butter- fly appear slowly. Finally, the butterfly is complete, it pierces the cocoon and comes out. Just what produces this mysterious change inside the cocoon is still one of the great mysteries of science. 9. The flax stalks are placed in run- ning water where they disintegrate so that the fiber from which linen is made can be removed. This disintegration is caused by bacteria. Without it the fiber cannot be separated from the stalk, acd without the fiber, linen itself would be impossible. 10. When we eat more salt than we Dangerous Reading ~» - ANATOLE FRANCE was a writer : “3 4A unsurpassed in modern times. : & He says the beginning of educa- tion is being interested. You can’t learn when you are bored. Hasn’t your own experience taught you that? How many people hate works of genius today because they were forced down their throats at a time when they found them dull? How many really great books and plays have been eternally spoiled for you because you were bored by them and had to read them at school, or m™ from a sense of duty? The truth is, whether a story was written last week or a hundred years ago—whether it is by a “classic” author or a widely-heralded best seller—if it is dull it is dangerous reading for the man and woman who have discovered what education means. When you have laughed, wept or thrilled Over one short story that is really good; when Beatrix as she is con- ceived by the Eng- tish artist, Hugh Thomson Would You Enjoy a Lunch with Beatrix? Beautiful Beatrix, immortal in fascination, irresistible in mysterious feminine appeal— with a touch of the devil. Ifshe came to your town, would you invite her to lunch, if you had the chance? Of course you would, and that luncheon would be history in your life, for Beatrix, Thackeray’s heroine, is one of the most tan- talizing women ever created. Beatrix is not alone. There are dozens of these exciting women waiting for you. You feel their presence in the room with you—electric, intoxicating. As if by magic they step out of the pages that hold them, to you. They are as alive as the girl you noticed on the street today. Hundreds of men have fallen in love with them. You don’t seek out the commonplace girl in real life. If women interest and delight you, don’t be content with pale, dull heroines who are only imitations of the colorful great ones. That is the endless pleasure of The Golden Book. There you are always sure of meeting the most wonder:u! women who ever sent a you have been absorbed in one truly moving book; when you have sensed life a little more keenly because of the winged words of one vivid poem, you have contributed more to your education than a man has received from scores of impressive volumes read from a sense of duty. That is why makes such an appeal to the reader who de- mands something interesting and at the same time enduring. From the vast storehouse of the world’s classics, written perhaps this year, perhaps thousands of years ago, each month it offers you those great stories, poems, plays and adventures that remain great because they are alive today. As the telephone, the automobile and the man’s heart pounding. From all countries and all times are the women it would thrill you most to know. Meet them in The Golden Book. radio enable you to live more richly, this new and delightful magazine has been inspired by the modern spirit to give you the pure gold that genius has mined. From all countries and all times it brings you adventures into literature. The charm of The Golden Book is like the charm of an exquisite bouquet, of a delightful meal—just the right selections relative to you and to each other. It is that indefinable thing—the personality of The Golden Book— that has brought in one year 200,000 devoted AMONG THE CONTRIBUTORS TO | THE APRIL ISSUE ARE: | W. Somerset Maugham James Stephens Georges Clemenceau O. Henry Stewart Edward White Lafcadio Hearn Joseph C. Lincoln Baudelaire Stacy Aumonier Lewis Carroll | Robert L. Stevenson Thomas Hardy readers It is really edited. 4 ¢ » eo ¢ Offer for Readers with 20th Century Minds .,’ ¢ Everyone who loves books that are interesting will see at once the dazzling possi- o P.S.M. bilities of such a magazine. é 4-26 In order that you may know yourself how stimulating The Golden Book can Ps be, we have decided— for alittle while only—to make a special offer to new sub- ? Introductory scribers. The regular price of The Golden Book is twenty-five cents a copy. ¢ Offer We are going to send you two issues at our expense, and this is how. If you Pd 6 Months for $1 act at once we will give you The Golden Book for six months for $1.00 e The Golden instead of $1.50. But—this is only for prompt action. ¢ Simply fill out the attached coupon and mailit to us today. Do it Pi Book Magazine 55 Fifth Avenue, now, while you are looking at it. This is only a temporary intro- New York ductory offer to new subscribers. We cannot offer it long. We do i Send The Golden Book not promise ever to make it again. Sooner or later you are going e to the address below at to become enthusiastic about The Golden Book if you enjoy ¢ ; Special Introductory offer, reading fascinating stories. Send the coupon at once and be ° six months. I enclose $1, in- need, too much gets into our blood. This glad. Do not wait and be sorry. Y stead of the usual $1.50. excess has to be washed away. Thirst is * oN * e MG Sicnccii ns veneer eatoreesaeeas a sign that the body needs more water Only One Prompt Dollar OT he for this purpose. ° FOCE ... eee Pee y NN oe oe ease sanwcsmaeenen . © This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6.

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144 Mr. J. A. Stransky of Pukwana, South Dakota, several years ago invented the wonderful little device which made POPULAR SCIENCE MONTHLY it possible for an auto to go 61 miles on a gallon of gasoline! Since that time he has built up an immense business, ship- ping Stransky Vaporizers to all parts of the civilized world, and helping thousands of men to make enormous big incomes distributing this product. | Loventor Cts Gasoline 0°aGALLON Now you can cut your gasoline cost as low as 9¢ a gallon. An amazing new invention makes practically any car give twice its regular mileage to the gallon. Many run from 37 to 57 miles and up to 61 miles a gallon. This wonderful invention is the work of Mr. J. A. Stransky of Pukwana, South Dakota. Already it is being used by over a million satisfied car owners—on all makes and models of cars. send you a sample at his own risk! And now the inventor will Read his offer below. Many now €ans250t0S500 a Month! Here is one of the biggest inventions of the century—an inv-ation almost as revolu- tionary as the invention of the auto itself. This wonderful little device adds more power and mileage to a motor, Vaporizer and Decarbonizer, automatically begins to admit a much larger volume of air, thoroughly vaporizing all the gasoline, giv- ing it fully 50° more power—breaking it up so that it explodes instead reduces spark plug trou- ble, prevents overheating, makes engine start easier, and prolongs life of motor —and it’s making fortunes for agents and distribu- tors. You can easily earn astonishing big profits in full or spare time-—many are earning $250 to $500a month! Here’s how it works. Every carburetor is ad- justed to make: starting easier—it gives a rich mix- ture to start a cold engine. But once the engine gets heated up the mixture is far too rich. Half the gas- long. did. better. good as nev. day I sold the for a week.—F. one hour's orders for the Cronk. AGENT EARNS $120 In One Day IT have found out that the Stransky will do what you said it would. forty orders in one day and wasn't out My Ford runs better than it ever I ean save half the gas and it pulls J. M. James. $48.09 in 3 Hours! — My gas bill has been cut nearly in half. every particle of carbon from my engine. Since I installed it, my engine runs as starts easier and quicker. I went out Saturday about 3 hours and secured 16 orjers.—J. A. Williams. Sold 32 to Yellow Taxi Co.— Yester- Yellow Taxi Co. 32 vaporizers after they had tried one out J. Manker, R. I. $51 in One Hour!-— work—17 men gave me Vaporizers.—J. W. of burning! Introductory Sample Offer To introduce this new invention Mr. Stransky, the inventor, will send a sample at his own risk. Write him at once for his proposition. You can earn big money just telling your friends about this startling new device—in your spare or full time. J. M. James made $120 in one day. Vernon Gaines netted $94 in eight hours. The de- mand is enormous. Every I took I have removed The results of oline is drawn into the cylinders in a raw state and instead of ex- ploding, it burns. This causes a heavy de- posit of carbon. But this startling little device changes all that. As soon as the engine warms up, this device, the Stransky auto owner in the country —and there are 20 million of them—wants this splen jid little device the instant he sees it. Just send the coupon for full details of our introductory sample offer. Mail it right now—today. J. A. STRANSKY MFG. CO. E-730 Stransky Bidg. Pukwana, So. Dakota May, 1926 This wonderful little device cuts the cost of gasoline in half by making practically any car give twice its regular mileage to the gallon— it made it possible for a car to go 61 miles on a gallon of gasoline! Ford Runs 60 Miles On a Galion I made approximately 60 miles per gallon of gas in a Ford Sedan, as I made 15 miles on one quart of gas.—O. B. Zeigler, Pa. 32 Miles with Buick Vaporizers installed on both Buick and Ford and are doing wonderful work. getting 32 miles on Buick and 51 miles with Ford. Harvey C. Hipple, Pa. ; Chevrolet Makes 43 Miles On a Gallon We have tried them out. Ford got 40 miles out of a galion of gas and Chevrolet got 43 miles. F. S. Carroll, Ind. = |] a J. A. Stransky Mfg. Co. 5 E-730 Stransky Bidg. i Pukwana, So. Dakota i= Tell me how I can get samples of the Stransky 8 Vaporizer at your risk. Also tell me how I can 8 make from $250 to $500 a month. e & t ' | |] BREW ois fe rehec in t 's Siete. ck ik ; Sw eee ewe eee eee eee eee ee é 1) & = © This seal on a radio or tool advertisement signifies the approval of the INSTITUTE OF STANDARDS. See page 6. ®. FR. DONNELLEY & GONE CO., PRINTERS, CHICAGO, pep a wo ti a