Popular Science Monthly 1928: Vol 113 Table of Contents

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POPULAR SCIENCE MONTHLY Mod Table of Contents Volume 113 JULY TO DECEMBER 1928

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POPULAR SCIENCE MONTHLY July 1% LEADING ARTICLES Astronomy Super-Rays Reveau Secret or CrEATION. By Alden P. Armagnac 13 New Metal Telescope Mirror 50 What the remarkable discoveries of Dr. Robert A. Millikan may mean Moon’s Rays Still a Puzzle . 59 Tetuinc Ocean Fiyers WHEN To Hop By James H. Kimball 16 Strange Ways of Studying the Stars . 69 The weather man’s experiences as official starter for famous pilots Two Pin Points of _ neue GermMany—“Dark Horse” or THE OLymPic GAMES Single Star... 74 . By Lawson Robertson 22 ° America’s coach tells what is ‘likely to happen at Amsterdam . Automobiles Fryers AGAIN Brat THE ARCTIC. By Ellsworth Bennett 24 eo Driven on Rocket Principle . 21 What Wilkins’ amazing hop means to aviation = an — a, 21 Tue Trutu Asout Fue.iess Motors . . . «By E. E. Free 25 Wind re Se a ie - cai —~ What scientists say of the claims of power out of nothing vem TOCR SSps OU Lae . 3 : A Motor Car Built to Skid . 58 Now [tt Tett OnE—Asout AFRICA By Thomas W. Phelps 27 Gesslins Tex in 66 Sinton 58 True stories stranger than fables, from a far-off land Sat Cees fine 61 One To Tutrty-ONE . ‘ By Prescott Lecky 28 A f ‘A h ld’ A - uto in Use for 37 Years. ‘ 61 n answer to the age-o question: re women as smart as men: Using a C-Clamp to Straighten F Bent ROMANCE WITH THE FisHING FLEET. . . . .By Carl Helm 32 Fenders . . ' 72 Down to the sea with the Gloucester fishermen Taking Weight Off Springs ; 72 Dick Byrp—ADVENTURER—PartT THREE . By Fitzhugh Green 34 Fender Guard Avoids Hooking . 72 The flight to the Pole; a story of brave friendship Cover Keeps Battery Clean . 72 I Can Peer 1nto Your STOMACH AND ForETELL Your Future Ingenious Homemade Oil Filter 72 By I. Seth Hirsch,M.D. 37 Ten Dollars for an Idea . 72 ” Modern miracles of science ce performed with X-rays Aviati Fryers Wxo Ros CaTerPILLAR CLUB . By Nell Ray Clarke 40 viation Thrilling escapes of men who have faced death in the air A Pole-Bound Flying Ship 21 MovnTAaINn CaRvVED INTO MoNUMENT . By George Lee Dowd, Jr. 42 7 ray sa ty ~ Sky | 21 How scientific genius turned a cliff into a camera plate Dictating "he Ae AD Pullman = BREAKING INTO AVIATION—PartT Two. By Edgar C. Wheeler 43 Up the Gangplank of an Aerial Liner. 30 America’s foremost airmen tell how they won success Promenade Deck of the Dirigible New WEALTH FROM Macic Sanpb By Walter E. Burton 45 R-100. . i. > pow = Amazing uses for “‘silica gel,’ a wonder of the laboratory ey in the Modern Airplane Wuen You Pian to Buitp—_— By John R. McMahon 67 <a - 8 An expert answers problems of prospective home owners é a P assenger Monop lane 30 re F aggage Caron Wings .. 31 How “Boottec” Gas Ruinsa Car | By Martin Bunn 70 A Berth in a Modern Sleeping Plane. 31 Gus tells why cheap fuel is most expensive a rey omg + in Ford Plane. $1 “The First Call for Dinner” .« 3 How Fifteen Passengers F ly in FICTION Comfort. . . “Hunky’ . By Whitman Chambers 18 Statistics Show Flying Safer. 56 A eins ‘tale of strong men who sift platinum from river mud aera —— - , oes ‘hasing Bandits wi lane . ay poate yr pon oor Six . . By S. W. Newmeyer 46 Plane Surveys Electric Line . 56 ane Se Ce Sane Seen Wing ~~] oe See Safe. 56 All-Metal Monoplane Flies . 56 RADIO Anchor for Floating Airports. 56 Beacon for Night Flyers . 56 Wauat Woutp You Do 1r You Were Czar or Rapio? 64 Gold Rush Made in Planes . 57 Anneuncing an unusual contest Echoes Tell sae Height . 57 pro Hints ror SUMMER UsE By Alfred P. fe Collegians’ Altitude Race. . 57 means y Alfre fans 6 Lindbergh = a Hee ‘ 57 Smithsonian Credits Wrights. 57 THE HOME WORKSHOP Aviators — ee — 57 Learned to Fly in Six Hours. 57 SpeeD witH A HomEMADE CoASTER. . By Hi Sibley 77 x 5 A design for a safe, swift toy that teaches boys road wisdom Lasgest Al-Motal Moneplane A “Rise-orr-GrounD” PLANE Health and Hygiene By J. Danner Bunch and Avison F. Koch 78 ds C Stud 51 " How to build a “pusher” model that will fly 1,000 feet a peg Falls y 51 Sree Batt Maaic ror MEcuanics ‘ . By Henry Simon 82 What Kills Ultra-Violet Rays? 51 Useful suggestions for putting the hardened spheres to work City of Apesfor Tests . . 51 july. 1928, Vol. 113, No.1. Popular Science Monthly is published month- United States, its possessions, and Canada, $2.50; foreign countries, $3. The y at 250 Fourth Avenue, New York, L a2 by the Popular Science Publishing contents of this magazine must not be reprinted without permission. In pre: 0., _— _Mateset 20 -class m r Dec. 28, 1918, at the Post ‘Ome at senting in its editorial columns numerous stories of new products of applied New k under the act of March. 3. “1879: additional ‘entry as second-class science, Popular Science Monthly does not underwrite | business met: manner ‘at Chicago, IiHinota. Bi as second-class matter at x. Post Office of the fe individuals or concerns Peg them. The use of on Science Department Cansda. Printed in U. S. A. Copyright, 1928, the Popular Monthly articles for stock-sel schemes is never authorized. ‘apen, clence Publishing Co., Inc. Single copy, 25 cents. Yearly ‘suhontiptions to President and Treasurer; R. C. Wilson, Vice-President; A. L. Cole, Secretary. July 1928 Decor: Airpla Lightr Mucil: Useful Toe G Uniqu Flashl: Line Heel (

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“4 July 1928 POPULAR SCIENCE MONTHLY 3 ' ; *% Remarkable Seven Sided Razor . 52 % World’s Most Silent Room . . . 58 I weer = y > : cas 50 Liquid Stocking Mender. . . . 53 |. Ultra-Violet Light Varies. . . . 58 Plant 1s Living Gas Works . . Substitute for the Shaving;Mug!} . 53 | Seven Babies Born at Once. . 59 N —" Noises by Radio i Safety Fuse-Pulling Device . . . 53 | A Word-Puzzle Tablet in Roman Pengepeniens Minerals . . - Machine Supplies Speaker’s Notes . 53 Ruins. . ‘ 59 Listening to Roar of Atoms. . yor Bathing Machine Provides Suds . 53 | A World-Wide Radio Clock . . . 5&9 Heart — after Two Days. . 59 | Frame Multiplies Hack Saw Uses . 53 | City Mapin PublicSquare . . . 60 | A New Marvel of Arc Welding. . 59 | ygotorized Baby Buggy Does Mile in Geyser Found in Nevada. . 60 ) . 40 Minutes. . ; 53 | How Much Do You Know of the | New Devices for the Home | “Talking Book” Ready Soon . . 54 World You Live In? . 60 Pans for “Checkerboard” Cake . 62 | Human Traffic Signal Lights. . . 54 | How Folks Will Live in 1978 . . 60 h Sponge Rubber Holder for Soap. . 62 | Clock Controls Street Lights. . . 55 House Clings to Cliff Side . . . 61 Compact Electric Dishwasher . . 62 | Fireless Mine BlastingGas . . . 55 | 120 Millionsof UsNow.. . . . 61 [ Flour Sifting Made Easier . . . 62 | Glass Blackboards Proposed . 55 | Boring Huge Telescope Glass_. 61 Novel Disappearing Ironing Board . 62 | Machines Spread “Stop Thief” World’s Queerest aie Is All Shaving Lamp Dries the Razor. . 62 Alarms . . 58 Windows. . . 14 Steel Card Table Easily Cleaned . 62 | Pipe Line Saves Potato Crop . . 58 IHuminated Reading Stand . . . 63 Wire Nets Defy Lightning - + « 59 For the Home Owner | New Hangers Save Closet Space. . 63 “‘Soundless”’ Police Whistles. . . 60 Back Yard Swimming Pool . . . 79 Electric Machine Gives a Massage . 63 Novel Piano Bench .. . . 86 An Ingenious Aid for Ironing . . 63 Radio Modern Electric House Wiring 5: a | New Household Paint Sprayers. . 63 Pash Buttons Tune Medic 55 | How to Hide Wall Board Joints . . 93 ery — an Supports the Crust . 63 Giving the Grid Tube a Shiel d 66 Combination Chest and Desk .-. oo ool for Preparing Swiss Steak. . 63 : : r How to Patch Old Furniture . . 96 Device Removes Balky Jar Tops . 63 hg a ed — es yo Models ABC’sof Radio. . . . . . 66 | Hints for the Mechanic ode Light Socket Antennas . . . . 66 | Lathe Used to Cut Small Gears. . 84 How 4 Yn the Rigging of the Mounting a Small Lathe Chuck. . 84 ayflower” . ‘ 4 Decorating Ship Model Sails . « * Unusual Facts and Ideas = png a oe 84 Airplane Model Blueprints . . . 105 | Asa Bird Sees Two U.S. Fleets. . 21 | folds Washers While Being Ground. 84 Face Death to Explore Sea of Ice . 49 Plug Gages from Old Slitting Saws. 84 New Processes and National Icebox Standards ; i» o oe ° We All Walk in Circles . . . . Sil Inventions Sharks Refuse toEat Man . . . 51 | Ideas for the Handy Man Lightning Distance Finder . . . 50 | Submarine Sunkin Test. . . . 54 | Decorative Metal Working . . 80 Mucilage Fountain Pen . . . 52 | Look Out for Poison Ivy Now! . 54 | Bedpost Bracket for Clock . . . 86 Useful New Razor Blade Holder. . 62 | Earthquakes Made to Order. 55 | Wood Turning for Beginners . . 90 Toe Guards Save Injuries . . . 52 | Rescuing a Dying Language 55 | Toy Duck Waddles on Wheels . . 92 Unique Mechanical Golf Teacher . 52 | Snakes and Ultra-Violet Rays 55 | Home Workshop Chemistry. . . 95 Flashlight Writing Pad... . 52 | Cruiser Sets Speed Record 55 | Home Workshop Blueprints. . . 99 Line Guide of Glass Aids Typists . 62 | Lightning Immunity Zones . 58 | Toy Howitzer Shoots Crackers . . 101 Heel Guard for Women Drivers. 52 4 Tiny Meteorite Hits Baby 58 # Cleansing Grease and Paint Spots . 102 WHAT IS COMING NEXT MONTH q/ The night sky glows. Pillars of flame and q smoke leap high. The very ground burns. “Skyscraper”’ modern furniture which we shall soon see in furniture is here. It is the You'll be amazed as you read an eye-witness account of ‘‘the biggest fire on earth”, which has burned unchecked for forty-four years! q How would you like to speed at thirty miles an hour in your little outboard motorboat? It can be done. An article next month will tell of the astonishing development of small “kickers” into a thrilling new sport. And our Home Work- shop expert will divulge secrets of hull and engine design that will help you coax more miles out of every hour. general use in many homes. Useful and beautiful, it is extremely simple in construction. Any home worker, if he has good designs to follow, can build decorative modern pieces quickly, easily, and inexpensively. Next month, an expert will show you how to do it. qj Scattered in far places of the world are rare and wonderful trees that supply woods which are put to curious and often important uses. An explorer whose business it is to search the wilds for these treasures will tell of his adventure. And fascinating articles telling the latest developments in aviation, answering the questions everybody is asking about airplanes, flyers, and flying A ES NNT

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POPULAR SCIENCE MONTHLY August 19 WHAT IS NEW THIS MONTH = Table of Contents for August LEADING ARTICLES 7 Astronomy Wuat Can Happen Wuite You Wink Your Eye. . ByE.E.Free 13 New Elements Found in Sun . . 60 Split-second marvels of a swift-moving era Trailing Unknown Planet . . . 60 *Foiks, THat’s RaMBuin’!” . . . . . « By Carl Helm 16 What Will Rogers thinks of aviation Automobiles TIMING THE SPEED OF A Birp. . By Myron M. Stearns 18 Motor Fuel from V bl New secrets disclosed by stop watch and airplane Know a Cer. egetables. . . Y mo. x Tue Greatest OversEAS Hor . . .By Robert E. Martin 19 Coma hell Plans Kew Effort for Auto How four men raced with death to span the Pacific Speed Mark. . 68 Tue WEAKLING. . . . . By AlzoWynn 22 New Pedal Jack .. ey A stirring fiction story of a flying rescue at sea Pedestrians Direct Traffic a Rockets Drive WonperR Auto . ... . . By Thomas Elway 25 Air Lifts Auto... Sh ok Riding a powder blast at two miles a minute Wheels Pump Own Tires. . . . 7 Doctors Diz Ficutine Fever .. . By L.G. Pope 27 Glare-Proof Mirror . . — - ae How martyr scientists helped conquer a dread malady Research for Ideal Headlight - > Fiyine Pianes witnout Morors . . . By Alden P. Armagnac 28 Motorcycle Like a War Tank . . 71 Thrills of gliding, America’s sensational new pastime Self-Opening Garage Doors . . . 78 Ficutine A 50,000-AcrE Fire. By Frank E. Nicholson 30 Handy Trouble Light. . . 78 The amazing story of a battle with a ‘44-year blaze Improvised Single Contact Bulb . 78 Amazinc New Joss ror X-Rays. .. . . By Boyd Fisher 31 Tin Can Valve Tester. . . . . 78 How wonder beams reveal oysters’ pearls and motors’ cracks Ten Dollars foranIdea. . . . 78 How THE “Mopern Iceman” Works . . . . ByH.C. Davis 33 A clear explanation of automatic refrigeration Aviation New Houszs ror OLD. . . By John R. McMahon 34 Dirigible Los Angeles Costs $500, 000 What a coat of stucco can do for ; your home a Year to Operate . 67 Queer Notions apout Orn Burners . . . .ByJohnE. Lodge 36 Oil Burning Motor Meets Test . . 68 Practical answers to odd queries on home heating with liquid fuel Lindbergh Tests Imported Flivver . 72 Water Fiivvertnc, New Nationat Sport’ By Earl Chapin May 38 Cost of Helium Gas Slashed. . . 72 Why modern outboard motorcraft can race at 30-mile speeds 5,000 Landing Fields. . . 72 Fortunes From Magic Locs. . . By Frank Parker Stockbridge 40 Two-Day Air-Rail Line to Span Romantic experiences of rare wood hunters on jungle trails United States. . 72 A Screntist or Watu Street . . . By George Lee Dowd, Jr. 48 Giant High-Altitude Camera... 73 Pioneer discoveries from an amateur’s research laboratory — nage os * 9 2 Ir a Boxer Suoutp Hit You— . . . By Grover Theis 48 a oe} Inside facts about the physiology of the ring ay ee : md oe 9 oa Dick Byrp—ADVENTURER—Part Four . . By Fitzhugh Green 50 Toda 5 ana Kites” aac 135 The real story behind the America’s trans-Atlantic flight y ehiiek: Teacuine “Linpy” NAVIGATION... . By Boyden Sparkes 53 ‘ , The difference between scientific piloting ‘and ordinary flying Eng neering Spare Parts You SHoutp Carry .. . . By Martin Bunn 76 Longest Arc-Welded Pipe. 64 Gus and Joe tell what to take along on a motor tour Triumph of Ancient Egypt’s ‘En- gineers . oo RADIO A Three- Mile Motor Tunnel. : » TUNING-IN THE SHorRT WaAvEs_.. . By Alfred P. Lane 44 1 How to build an adapter that will widen. your set’s range Health and Hygiene WueEn You Buy a LoupsPpEAKER— . . . . +By John Carr 47 Copper Cones Arges Sate, —_ Choosing the right talking unit for your receiver Plan Testson Men. . . os Dress an Engineers’ Problem . . 67 Black Sheets Induce Sleep .. . . 68 THE HOME WORKSHOP Now You Can Burtp Mopernistic Furniture By Herman Hjorth 56 Laboratory Discoveries Directions for making a “skyscraper” stand and bookcase A Man-Made Aurora Borealis . . 65 How to Make A Bremen Movet By J. D. Bunch and A. F. Koch 58 Heat Determines Frogs’ Sex. . . 65 An easy-to-build replica of the trans-Atlantic plane Odd Wind Resistance of Houses . 67 Simpuiriep Cutter GrinpiInc . . . By Hector J. Chamberland 84 Most Gigantic Incandescent. . . 68 Practical methods for small shops & New Explosive Beats TNT . . . 68 Gap Sr tha. Deeett here ntneear mine marth eed Pate to pees cot Crete, ete crate De red as second: . 28, 1918, at the Post Office at senting in its editorial columns numerous stories of new products of ap New York under the act of Mareh_ 3 “9879: additional “entry as second-class science, Popular Science Monthly does not underwrite the business Bo ne 4 matter = a. — Eatered . second-class masse: 3 at on Post it. ¢ the individuals or concerns producing =. — we Set Selence Science wpubitshing Co., Inc. Single ‘copy, 25 — Yearly ~ ft K-}.- to President py tty Rec wilson, Vice-President: A. L. Cole, Secretary, August 1928 AM Snap M Sails How Plan pri Ne Sud-! Elect This Fork Safet Doug “Fry Saw- Foldi New Devi A Ha Myst Five Clock Mete: Spade Divin Divin Telep Nong ‘| scr awi wel fase use anc tha

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August 1928 POPULAR SCIENCE MONTHLY 3 Models if Portable Drill for Oil Wells . . . 70 ¥ Prize Offer for Moon Flight. . . 67 Giving Screw Heads a Finish . . 70 | Thinking with Halfa Brain. . . 68 op it pees —— iene Ship ae Bolt Turns Corners . . . . . 119 | Ford, Lawrance, and Elmen Receive Model Deadeyes 90 Medals We ™ wt wt ) ® | | SF oan? oa ° Hunting Lost Races of Men . . . 8 _ for Ship Models. = Radio Most Daring North Pole Plan . . 113 ow to Mold Ship Model Blocks . 104 | Coil Winding Made Simple. . . 46 Plane Model Built from Our Blue- Saving Time in Radio Construction 46 prints. - 104 | A BC’sof Radio. . 4“ For the Home Owner “Ham” Uses New Radio Band . . 67 | Howto Enamela Front Door . . 80 ° Noise-Proof Walls for Radio. . . 70 | Hints on Cementing Rain Pipes. . 99 New Devices f or the Home Fan Converts Hot Attic into Livable Sud-Scraping Floor Pan and ita 62 Ships Room ..... . .. . 104 Electric Pancake Cooker. . . 62 Leviathan Sets Speed Record - This Rocking-Chair Folds . . . 62 Part. 0 ° ° Fork and aces inOne . . . . 6@ | Sixty-Hour Trans-Atlantic Speed Hints f or the Mechanic Safety Brush Washes Windows. . 62 Boat Ready to Go . - + 69 | Dust Plugs for Chucks and Face- Doughnut Cooker Like Waffle Iron. 62 Plates. . 91 “Frying Pan” Cooks Whole Meal . 63 Unusual Facts and Ideas Scrap Parts Converted into Spray Saw-Blade Knife Cuts Bread and , : Gun for Painting . . 91 Meat . 7 63 a ae s a tod _« 2 folding Diets Lea Door’ 03 | Me Boge Beals Reo” - 8 | Ideas for the Handy Man Ror ats Spa Soe Ont 8 Your Dollar Gains 13 Cents. . . 55 | Hintsforthe OutdoorMan. . . 82 Device Strai Cannibal Mosquitoes . . . 55 | Homemade Trailer for Boats 83 levice Straightens Bent Jar Caps . 63 I Thugs “Fi ed’ , Puller for F Stapl. A Handle for Your Scrubbing Brush 63 macet Zhuge | Fingepeint + oe eS _ & Your Body a Radio Station. . . 60 | Straightedge GuidesSaw. . . 88 Greatest Meteorite in History . . 60 | Don’t Chop Up That Old Table 88 New Processes and Man-Made Sun Grows Wheat . . 60 | How to Do Trick Whittling . 90 Inventions Orchid Bombards Bees . . . . 61 | Rubber in the Home Workshop . 93 — The Blind Read by Sound . . . 61 | How to Turn Ornamental Legs for a Mystic Fire Fighter . . . . . 61 | “Lightning” Tamed in Test. . 64 Footstool . 94 Five Machines Joined in One . . 65 | Ships Talk Through Water by Sound Blueprints for Your Home Workshop 102 Clock Times 20 Men at Once . . 66 Signals : 65 | Sharp Tools Save Time . . . 104 Meters Read over Phone Wire . . 66 | Light Waves Preserve Bread. 65 | Portable Seat for Outdoor Events . 105 Spade and Fork in New Tool . . 66 | How Much Do You Know of the Cabinets to Guard Your Tools . . 106 Diving Suit to RecoverGold . . 67 World You Live In? 3 65 | A Non-Sticking Wooden Vise . . 106 Gage Measures Diamonds . . . 70 | What “Fair Weather Means . . 66 | How to Miter Screen Molding . . 106 Diving Bell as Submarine Aid . . 70 | Elephants Taught to Plow . . . 66 | Homemade Ruling Pen Stripes Lac- Telephone Lock . . . . 70 | Lathe Made of Old Car Parts . . 66 quered Furniture. 106 Nonsplitting Wood Nails. . . . 70 ™ Auto Exhaust Fights Gophers . . 67 ™ Mirror Lights Cellar Workshop . . 106 WHAT IS COMING NEXT MONTH q] Television, or seeing by radio, is coming, they say. You will sit in your study and see on a screen the moving march of distant events. Far- away friends will smile at you as if you and they were face to face. But when? You'll know the truth about television when you read how far today’s experiments have really progressed to- ward practical success. q What is sulphur good for? “To burn,” you might reply, and soit is. But did you know that not long ago a chemist discovered that it can also be used for making a variety of things rang- ing from toilet articles to radio loudspeakers? And that is but one example of the amazing new uses that have been found for chemical elements. A fascinating article will tell how many such new uses have been found for long familiar elements and enriched their discoverers; and of the rewards that await future discoverers. qj Do you know how to have your picture taken? It sounds simple—but there is more to it than you think. An absorbing article next month re- veals the secrets of getting a good likeness, and the interesting foibles of great men who have sat before the camera. q A man peers through a microscope and sees swarming creatures so tiny that thousands of them could cavort on a needle’ s point. “How mighty am I,” he observes, “compared with these!” Another man sits at the eyepiece of a giant telescope, his eyes boring into the immensity of space and its vast systems of churning worlds. “After all,’”’ he reflects, “chow insignificant is man amid such grandeur!’’ Which is right? A college professor tells, next month, where man really stands in relation to the universe—whether he is a giant or a pygmy. AND important articles that will keep you abreast of latest thrilling advances in aviation and engineering—special new home workshop, radio, and automobile features

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POPULAR SCIENCE MONTHLY September 194

a

WHAT IS NEW THIS MONTH

Table of Contents for September

LEADING ARTICLES Cover DEsIGN. . . . . . By Herbert Paus A SHoE-STRING Anvantuan IN THE = Stocx Manxar By Wallace Ames The month’s financial section How tHe New Raptio Sets Are Testep . By Alexander Senauke Results of the Popular Science Institute of Standards tests Our Reapers Say— Maxine Over THE Movies .. . ._. By Alden P. Armagnac Will “talking pictures” revolutionize a giant industry? Lost IN THE ARCTIC . By Edwin Ketchum How air rescuers braved terrors of North to reach Nobile Huce Buttpines Burnep To LEARN Secrets or Fire By H.C. Davis What Bureau of Standards experts found in charred ruins New Joss ror Otp METALs . . ByE. E. Free Amazing ways science is putting familiar elements to work A RarLroap on CusHIONS . By John Walker Harrington Engineering marvels of New York’s newest train route JERRY SMASHES THROUGH . . . By Jesse F. Gelders A gripping fiction story of the oil fields New Maaic Workep By Cameras . ...__ .. By Ellsworth Bennett How modern photography serves science and industry Is Man PraemyorGrant? . . . ._ .By William Bradley Otis A college professor’s answer to a remarkable question Arr Trme-Tastes Now Make Ftiyinea Trips Easy . By George Lee Dowd, Jr. The inside facts about travel by air Is O11 Burntne Too Costty? . . By John E. Lodge What to look for in a heating plant besides comfort Tips FROM A VETERAN CARPENTER . . . By John R. McMahon Practical facts an amateur housebuilder should know Do You Know How Your Icesox Is Buittt?. . By R. D. Morrill An engineer’s version of what you get for your money Monet Ratrtways Riva Reat ONEs. By L. G. Pope Fascinating details of the most painstaking hobby of all Dick Byrp>—ApvENTURER (Conclusion) . . By Fitzhugh Green A famous aerial explorer’s next great project Tue New Rapio Sets Orrer— . . . By John Carr Fruits of a year’s astounding technical advances Tue Reat Facts apout TetEvision . . . By Alfred P. Lane What you can do today with sight by radio Wetcomine INVENTORS INTHE Navy . . By Norman C. McLoud How a new award system spurs civilian genius First Woman Fites OVERSEA . Miss Earhart’s aerial conquest of the Atlantic Maxktnea Mopernistic SCREENS . : How to construct inexpensive up-to-date. pieces How to WuittLE A Suip Mover... By E. Armitage McCann Details of a clipper ship you can make with a jackknife OvursoarD Racine SEcRETs . . . By Newcomb Leonarde Timely tips for the motorboating enthusiast Wuat Goon Is Automosite Insurance? . . . .By Carl Helm How far your policy covers you EpIToriALs . , ; oom @ Way “Fix” a Dente Car? ; : By Martin ene Gus tells when to repair an auto—and when to leave it alone 4 8 10 13 16 18 19 21 22 25 27 28 30 31 33 34 37 40 43 47 58 60 61 62 76

Automobiles Rubber Bumper Softens Crashes . 55 An Anti-Skid Fifth Wheel . . . 55 Hand Button Starts Ford . . . 55 Tool Straightens Fenders . . . 55 Motorists’ Mail Box . . . 55 “Observation Body” Thwarts Back- Seat Drivers. . . < «oe Measures Oil’s V iscosity . <2 « oe Motorcycle Carries 5 Police. . . 64 Truck Driven from Outside. . . 64 New Engine Slashes Gas Bills . . 65 Autos Lead in Use of Power. . . 65 A 7-Horsepower English Car . . 66 Auto Launches Lifeboat. . . . 67 Auto Van Aids New Style Hunt . 67 Puzzle in Auto Lights . . . . 70 Know YourCar . . 72

Large Terminals Built for Bus Lines 73 Does the Rain Drown Your Motor? 78 Fixing Broken Windows. . . . 78 A Radiator Screen. 78 A Quick Way to Find Cotter-Pin Holes. . How to Get Rid of Annoying Fumes 78 Aviation Plane Races with Crack Train . . 36 What Do You Know about Aviation? 36 Italians Fly 4,400 Miles. . . . 48 Many Seek Endurance Record . . 48 Deadening a Plane’s Roar . . . 48 New Aero Motor Is Biggest. . . 48 Nations Race to Lead in Air. . . 48 Navy’s Sikorsky Amphibian. . . 49 Plane Ready for Catapult Launching 49 Junkers for New a Paris- Berlin Service .. . 49 Safety Plane Flies in U. S. —a Weather Man Fliesfor Data . . 49 Auto-Giro Crashes . . . . . 49 Tries to Rent Airto Planes. . . 65 Giant Zeppelin Will Go to ee Bidder. . 66 Parachute Lands Entire Plane «ee Haven for Planes. . . a Tests Show How Fast We Fall . . Automobile Men Turning to Air . 137 Combined Plane and Bus Lines. . 137 Exceptional People Famous Physicist Is Part-Time Artist . . i oe se Champion Slate Splitter =a Owns and Drives Locomotive . . 54 Massachusetts’ Firearms Expert . 54 Twin Boy Students Make Diamonds 57 One Man Rules Tunnel Traffic . . 65

September, 1928, Vol. 113, No. 3. Popular Science aGonstty is published month- urth “Avenue, "New York, N.Y., by the Popular Science Publishing —— of this m Entered as second-class matter Dec. 28, 1918, at the Post Office at mting in its editorial columns numerous stories of new products of applied selencs Popular Science Monthly does not underwrite the business methods matter at Chicago, Illinois. Entered as second-class matter at the Post Office of the individuals or concerns producing them. The use of Popular Science peearement Canada. Printed in U. 8S. A. Copyright, 1928, 4 the Popular Monthly articles for stock-sellin ubscriptions to President and Treasurer; R. C. Wilson, Vice-President; A. L. Cole, Secretary, Lag 4 250 Fo’ New York under the act of March 3, 1879; additional entry as second-class Publishing Co., Inc. Single copy, 25 cents. Yearly 's United States, its possessi d Canada, $2.50; foreign countries, $3. The _ agazine aunt not be reprinted without permission. In pre-

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September 1928 POPULAR SCIENCE MONTHLY | | os O@2atro | —_—— ——— _—————— Health and mabe New Gains by Medicine. . 56 Measuring Your Sunburn Rate . .» & Electric Machine Cures Cold in Few Minutes. . : so» ee Colds Are the Costliest —aae Cancer Cost Neara Billion . . . 71 Laboratory Discoveries New Use Found for Cadmium . . 64 Hunt Mysterious Element . . . 70 Telescope May See Martians . Isl Still Newer Uses of X-Rays . . 134 Meteors Cause Imitation Quakes . 142 Models and Toys Model Tests Flood Control . . . 68 Toys Teach Housebuilding . . . 69 How to Build a Giant Model Airplane 80 Toy Hydroplane Travels at Great Speed .. 99 New on die the iti A Water Power Mixer . . . . 50 Moth Balls in Hanger. . . 60 Rolling Pin Contains 11 Utensils . 60 Compact Dryer Saves Space. . . 50 Vacuum Cleaner Sprays Paint . . 50 Takes Slack Out of Clothesline . . 50 Automatic Electric Waffle Cooker . 50 Cuts Whole Cake at Once... 50 Whisk Broom and Shoe Polisher in One. . . . 1 Tiny Necktie Troning Board. » « Me A Dining Cabinet in Your Wall. . 51 Collapsible Bed Has Folding Spring 51 Presses Ties by Electricity . . . 51 Makes Gas Cocks Foolproof. . . 51 Suction Ash Tray Sticks to Wall . 51 Disappearing Shoe-Shine Cabinet . 51 New Processes and Inventions Spoon in BottleCap . . . . . 52 New Tool Clips Newspapers. . . 52 Mechanical Billiard Instructor . . 52 Handy Shaving Brush Holder . . 52 A Finger Holds This Flashlight. . 52 Shovel Like Ice Cream Spoon . . 52 Novel Ash Tray Easy to Clean. . 52 New Razor Blade Sharpener. . . 53 A Motor Boat That Folds . . . 53 Odd Practice Violin . . . 58 Reading Lamp Clamps on Book. . 58 “Sun Suit” Admits Health Rays . 53 Spotlight in Shaving Mirror. . . 53 New Pliers Grip Hexagon Nut . . 53 Coast Guard Sergeant Invents New Cable. . 54 Chemist Devises Bottle-Sealing Ma- chine. . . 54 Relief Maps Made by Machinery . 87 Machine Beats Soporific stead in Producing Sleep. ) F New Perfume in Paste Form. Airplane Wings on Sailboat . Weed Mower for Railroads . Making Phone Speak Up. Photography Photos in Natural Colors. Inventor Makes Wheels Spin Right Way in Movies . This a Harnesses Sun- light . Radio Solder That Needs No Iron . Long Loudspeaker Cords. Don’t Be Fooled on Noises . When the Tuning Changes . Old Power Tubes Distort A B C’s of Radio . Marconi Has New Project Another Radio “‘ Roof?” Press Button to Tune-In . Huge Reflector Sends Beams of Radio. A Giant Radio Reflector . Ships Largest U. S. Sub Also Safest New Ship to Dwarf Leviathan ; New Plane Carrier Sets Speed Record Two Victories over Pests. Most Mishaps Avoidable. Baffling Mysteries of Mining Phone on Aerial Fire Engine Clock Can Be Seen 20 Miles 20 Billion Ice Cream Cones . Gigantic English-Made Bell Coming to America . Cavalry Horses of Tron Box Controls 2,000 Trains Figures Deny “ Race Suicide”’ Was Methuselah 969 Years Old? Novel Use for Typewriter in — Flexible Rules Asbestos Suits Worn in Fire . Greater Power in Fire Boats Dressing Ivory in Silver Coat : Tells How to Remember Names and Faces. , Blows Icebergs to Bits ; Mouse Traps Camouflaged as Corn- cobs and Cans . —— Kite Does 300 Loops. . World’s Biggest Bird Cage . Sounds That Climb Highest . Earthquake Telegraphs News of City's Doom . . 4 More Powerful Than TNT , Free Shower of Perfumes. Many Frogs; Prices Drop No More Lost Golf Balls? What Is Your Question? . 57 s Uncle Sam Runs a Still . Unusual Facts and er 70 71 72 64 66 71 r How to Wheela Barrow. . . . 7 29,000,000 Go to School . . .. 72 How Much Do You Know of the World You Live In? ‘ Room for Millions More. . . . 7% But Not Exactly a Relish . . . 78 World’s Largest Building . . . 78 Fossil Is 600,000,000 Years Old . 131 Great Oceans under the Ground. 142 For the Home Owner How to Drive Nails to Make Them Hold Fast . Keep Your House Looking New. . 104 Dress Up Your Old Furniture . 106 You Can Build an Indoor Incinerator 118 Hints for the Mechanic Sharpening Milling Cutters. . 84 Radius Attachment for Large Lathe Work. ; 86 Tailstock Center for Grinding . . 86 Test Your Micrometer . . . . 86 Why Milling Cutters Run Out . . 86 Screw Slotters Make Slitting Disks 86 Stopping Throws Out Grinding Wheel 86 Double Time, Double Profit. . . 86 Handle for Swab Rag. . . . 17 Ideas for the Handy Man Can and Candle Make Improvised Lantern. . 82 Canoe Supports Waterproof ‘Shelter 82 Makes Drinking Water Safe for Campers. . . 82 Forked Sticks Make Camp Chair . 82 Netting Support Foils Mosquitoes . 82 An Inner-Tube Air Pillow . . . 82 Fastening Tent-Stakes .. 82 Tin Cans Converted into Cooking Utensils . . 82 Substantial Board Chair Easy to Make .. ; 82 A Practical Fishing-Tackle Box. . 82 Making a Boomerang. . . . . 82 Novel Air-Rifle Target . . . . 8 Tables for the Wood Turner. . . 88 Back Yard Chute-the-Chutes . . 90 Making a Spanish-Colonial Wood Box 90 Old Stove Bowl Used as Temporary Forge 96 Unique t Triple Stand Combined with an Electric Lamp . . 97 Home Fire Alarm Rings When Heat Melts Paraffin . . 99 Shield for Paint Spraying : 101 Blueprints for Your Home Workshop 102 How to Test Distilled Water . 103 When to Use Quarter-Sawed Boards 108 Sturdy Jig Saw Built at Low Cost . 113 Neat Rack for Paint Brushes . 118 Shavings Used to Imitate Difficult Inlaid Work , . 119 Glass Case Protects Nesrow Saws . 119 72 4 Quickly Made Kitchen Stool. . 120 NEXT MONTH— Fascinating articles that will tell of the latest achievements of invention and discovery; also practical how-to-make-it features for home workshop, radio, housebuilding and automobile enthusiasts

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i | POPULAR SCIENCE MONTHLY

—————

WHAT IS NEW THIS MONTH

———__| Table of Contents for October

=> LEADING ARTICLES i Astronomy Cover DEsiIGn . , By Herbert Paus Do Stars “Eat” Meteors? . . . 57 How To Quit Worryine over Money Marrers By 'y Wallace Ames 4 The Sun’s Flames Measured . . 69 The financial editor’s monthly counsel , Do Your Rapio Tuses Last? . 8 Automobiles New tests of the Popular Science Institute of Standards . Foiling the Motor Car Thief. . . 52 DirietBLes Make New Bin to Rute tHe Air’. By H.C. Davis 13 New Car Parking Plan . . . . 58 Are gas-filled ships or planes to be aircraft of future? A Gasoline Torch of Sand .. . 64 New Arr Lines Link Aut Americas. _._ By Grover C. Mueller 16 Merry-Go-Round Garage Plan. . 66 What a giant aerial hook-up means to the United States Explorer's Sea-Going Auto . . . 66 Secrets or New Coior Movies _By Robert E. Martin 17 Know YourCar .. 67 Details of the first natural-tint process for amateurs Device Lets Driver See High Traffic Tue Covorapo SPANNED AT Last. By Ellsworth Bennett 19 Lights . . 67 Engineering marvels in first bridge across a mighty canyon New Jack Saves Work rn tain | 67 Sout Sea Cotony REvEAts New Facts oe, dud, Plates Fitted to YourCar . . . 69 win eale 20 Auto Bumpers Standardized . . 69 A stranger-than-fiction story of mutineers who founded a new race Autos Halted in Five Feet . . . 70 JoHn KenLoN—FireE FIGHTER . By Henry Morton Robinson 22 Asks Elevated Auto Exhausts . . 71 Beginning the thrilling account of a veteran Y chief” s battles with flames Big New Automobile Built Like a Maaic Ceti Works New MarveEts By E. E. Free 25 Luxurious Yacht . . : 72 An expert tells of the wonder tool of modern science Auto Seats Made into a Bed — A Mystery or THE Bioop Sotvep . By George Lee Dowd, Jr. 27 Automobile a Sun Bath House . . 73 The story of William Harvey, father of modern medicine Warns When Tail-Light Fails . . 73 Sea Water Runs Strance Dynamo By Edwin Ketchum 28 Tank Measures Gasoline by the Mile 78 A daring engineer’s plans to harness the ocean’s warmth Steam Thaws Radiator . . . 78 “Carvep” Stone Cast in Mops . By Wyatt Brummitt 30 Emergency GreaseGun . . . . 78 The amazing uses of concrete for architectural ornaments Novel Folding Runway . . . . 78 Winpows—tTHE Eyes or THE House By John R. McMahon 31 Ten DollarsforanIdea. . . . 78 Tips about sashes, casements, and glass from an expert Exectric “Suns” Fient DisEasE . By Thomas Elway 33 Aviation O . ow and — use ultra-violet light By Leo F.C New Test Questions on Aviation 48 N TIME IN THE Foc . oF. Creagan 34 . : ; A stirring fiction tale of railroad adventure , , om yg raight Up . . . baa! RE hig qs ~ Ocean Now By Boyden Sparkes 37 Pires Corsien a as Hangar | 9g eee eee ee eae First Link Ready in Air-Rail Line . 62 Wauat Is an InvENTION ANyway? . . By P.A. Carmichael 39 Pla: al Tle Itself 68 An old-timer tells what you can patent, and how to do it me Annet nd ie | | InstiTuTE Exposes New Rapio Gyps . By Alexander Senauke 40 ot en ees. . . o The truth about “buried antennas” Propellers Made of Cotton . . 62 Suatt I Burp on Buy a Ravio? . . . . By Alfred P. Lane 41 Landing Wheel of World's Largest Both sides of a moot question Plane. : ' 62 Rapio Harts THE Dynamic SPEAKER . . . . ByJohnCarr 43 Planes for Sale—$695 Up . 63 Science’s newest gift to broadcast reception Device Invented for Refueling i in \ Air 63 A Puay Tuat Mane Foorsait Over . By Edwin B. Dooley 44 Crawls Under Speeding Plane 63 A famous star tells of the history-making forward pass Air Mail Letter Circles Earth . 63 Maxine Tuinos Fit Tuat Don’t Fir . . By Hyatt E. Gibson 46 Reliability Tour, 6,300 Miles, Is Advances of standardization, modern boon to industry Completed by 24 Planes 63 A Maaic City From 4 Swamp o. & Navy Bids All Officers Fly . 63 Turning a waterlogged meadow into a metropolitan suburb Largest Flying Yacht ‘ 63 A Smatt Bencn.. By E. E. Ericson 58 Ship-Shore Plane Service Starts. 63 How to make a worktable for carpentry and enhdheliting “Nerve Center” of Air Traffiz . 64 Buriprne Mopernistic Lamps. ‘ By Herman Hjorth 59 Helium for Everyone. . 66 Simple instructions for making pieces in the new sty le ; Two Thousand Planes Built i in —_— 166 A - ror Your Sup Move . By Capt. E. A. McCann _ 80 Banks Save Money by Air Mail. 172 etails of a —— cover for a valued replica <n on New Ways To Paint Rapiators ‘ erton Elliot 61 ° ° Modern finishes for heat and _— . Eng neering EpiTorRiats . . 74 Stone Banks for the Mississippi . 48 A Pisce or Srrine Fixes AN AUTO . - By y Martin Bunn %6 Skyscraper Sets Speed Mark . . 71 Gus and Joe tell of queer motor troubles ‘and remedies # Building Highest Dam. .. . October 194

October 192 Test Anti Tear Mac Mak Boys Mod Wins Colo Ne: Trone Baby Ice-C Cloth New Wren Dryit Papel Mech Hand A Gal Bristl A Bu Steel | Two-] New | Cigar Straig Fast | Machi Novel Mo! New | Sho

tober, 1928, Vol. 113, No. 4. Popular Science Bepastte 1 euttietes month- iyat 3 250 Fourth Avenue, New Yor N. ae by the Popular 8 Inc. Entered as second-class m r Dec. 28, 1918, at the Post ‘Omes at New York under the act of Mareh_ 3 “9579: additional entry as second. matter at Chicago, Illinois. Entered as second matter at the Post Office Department, Canada. Printed in U. 8S. A. Copyright, 1928, by the Popular Science Publishing Co., Inc. Single copy, 25 cents. Yearly ‘subscriptions to United States, it; te possessions, and Canada, $2.50; foreign countries, $3. contents of t agazine must not be reprinted without permission. ia bree senting in its editorial columns numerous stories of new products of J ied science, Popular Science Monthly does not underwrite the business methods of the individuals or concerns producing them. The use of Popular Science ee ad articles for stock schemes is never ounetyes. oO. apen, President and Treasurer; R. C. Wilson, Vice-President; A. L. Cole, } Se

Print | Hand New ¢ Machi Color A Mec Packir Sound Mask Scienc NE

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1%) October 1928 POPULAR SCIENCE MONTHLY 3 —a 1 Exceptional People * Photography * Manuscript Ages Old Saved . . 70 Famous Racer Builds Telescope . 54 | Camera Referees “Tied” Races . 54 The Safe Way to Wash Sik. . . 71 “ ‘ Gas Kills Boll Weevils . . . . Ti He Makes Wood — of Movie Camera Harnessed to Dancers 64 . Inlaid Pieces. . . 54 | Camera Catches Church Thief . . 67 | When MetalGets Tired. . . . 71 "a ‘ Machine Makes Plant Movies . . 69 he 000 Duck. . h ss @ Health and Hygiene Beating Heart Is Filmed . ; ; _ 69 g e Rainiest Spot on Eart ° ° . 2a , : A $25 Home Talking Film Outfit . 69 horthand Sent by Telephoto . . 72 | Tests Giraffe Parasites on Self . . 56 F Insects Poison and Stab Ants . . 72 ; . Sage ; ilm Showing Color Shades Here for = Anti-Radium Poisoning Device. . 56 Aenstoes’s Camete . 71 Any Questions? . 72 7 Tears a Powerful Germicide. . . 57 = = Trees Grow by Spurts “for Forty Machine Gives Anesthetic . . . 71 ’ Days of Each Year... 73 Radio Tiny Tractor Moves Huge Cars . Models A Flat Loudspeaker Cord . . . 42 | ClockaGlacier’s “Diary” . . . 73 Mee What Choke CoilsDo . . . . 42 | Test Burningof Matches . . . 73 . Remarkable Miniature Ca thedral _ Adjustable High Resistance. . . 42 Recording National Dialects . . 173 Making Moon Replica with Drill . 54 | joy to Tune Sharply 42 | A Blotter That ErasesInk . . . 153 Boys Run a Miniature Plane Factory 68 A BC's of Radio ete en 49 Models That Fly Farther .. 82 For the Hom e Owner Wins Three Prizes with Our Models 104 : 1 Coloring Ship Model Chains . . 110 Shi ps Odd-Job Tips for Handy Men . . 80 } Tiny Saw for Model Making . . 148 , . Easy-to-Build Bookcase . . . . 90 World s Largest Tin Dredger . . 55 | A Fine Finish on Poor Wood . . 92 N. Devi he H Towing World s Largest Dock . 55 | A Vault for Your Valuables. . . 94 ew Levices for the Fiome | New Canadian Liner Seen from Air. 55 | How to Patch Old Furnitye . . 96 y Ironer Runs by Washing Machine. 50 | Boat se ha ead ee Works Lighter for Smoking Table . . . 97 7 Baby Ironing Board for Travel. . 50 | Cc ae — OH ss - Shelves for Closet Walls. . . . 104 ) Ice-Chopping Pail Saves Sink . . 50 Ww. t ge” os ” Me Drive Ship: . Ash-Pit Sprinkler Reduces Dust . 108 ) Scrub Brush and Floor Mop in One. 50 Throu h O Bn ee. 70 Remedying Leaking Gas Ranges_ . 131 ) Clothes Dryer Hangs from Boiler . 50 8 : — How to Preserve Hardware . . . 133 1 New Electric Clothes Washer. . 51 Removing Floor Varnishes . . . 138 Wrench Twists Off JarCaps . . 51 Unusual Facts and Ideas P . 2 Drying Rack for Radiator . . 51 | Detroit's New Boulevard Liel Hints for the Mechanic ghts . 52 saan ‘ d Paper Receptacles for Serap Pail . 51 | Oid'and New in Oil Wells. _ 55 | Winding Springs Is Easy. . . 84 3 Two-Purpose Gasoline Heater . . 51 Handling Huge Locomotives . . 55 | HowShop MenCut Corners . . 86 3 Measuring a Man’s Oxygen Needs . 56 | Old Bill Says—_. - . 86 . New Processes and Acid Test for Leather. . . . 56 seal 4 Round Parts. . 121 ; Radio Keeps Milk Sweet . . . 57 xtending Life of Gage Blocks . . 122 8 Inventions Memory Goes to Birth . . . . 57 | Hints on Babbitting Boxes . . . 122 8 Mechanical System That Sorts Can Chemists Save Farmers? . . 57 | Pulling Bearing Sleeves .. . 124 8 Freight Cars. ss 52 | Man a Million-Volt Dynamo . . 57 | Tailstock Centering Attachment . 126 Handy Tool of Ten Uses. . . . 52 | Scientific Waron Rust . . . . 57 | Wood and Babbitt Used to Make A Garden Hose Holder . . . . 52 | “Wheelbarrow” Police Forts . . 64 | Steady Rest . . . 127 , Bristleless Toothbrush . . . - 52 | Questions Answered . . . . . 64°] Combined Plug Gage and Arbor . 127 4 wy eae Door... . rs Coal Dyed Pink and Blue . . . 64 2 Two-Filan < Mis - es po Big Mail Carrying Torpedoes . . 64 Ideas for the Handy Man 7 ew Biin Meer wade mp 7 "gg Taming Waves to Save Beach . . 65 | Governor Improves Ford Motor Used 2 es eS Speed in Phone Information. . 65 as Power Plant. .... . 98 Cigarette Case-Checker Board - + 53 | Attention, Inventors! Here’s W hat Mending C. Furni 2 Straightener for Golf Clubs . . . 53 the World Is Crying For . 65 Blue ng fe ie ‘Sona -- . 100 2 Fast Electric Paint Remover . . 53 | Acid Bath for Piano Keys . . . 65 H it~ sh ae ee ckshop = . 102 . Machine Fills Lighter. . 53 | Odd Mineral Masked as Coal . . 66 conan ag | oe. . - Novel Railroad Tank Car Transports How Much Do You Know of the Removing Ink from Woodwork. . 106 2 Molten Metal .. 55 Sittin 66 Automatic Door Lets Hens Out . 110 ° New Seismograph Magnifies Earth World-Wide Hunt for Radium Candlestick Turning . . - . ie 3 Shocks 1,000 Times . . 56 Planned by Carnegie Expert . . 67 | Motor Driven Sprayer for $10 . . 118 S Print Your Own Electric Sign . . 65 | Tools Shape Workers’ Hands . . 67 | Paper Clips and Pencil Hold —_ s Hand Bag Is a Raincoat, Too . . 65 | Chairs Ventilate This Auditorium . 67 Reference Books. 118 New Quick-Drying Varnish . . . 67 | Vending Machine Says“Thank You” 68 | This Radio Cabinet Looks like a 3 Machine Counts Phone Calls . . 68 | Botanist Hunts Mate for Trees. . 68 Pirate’s Chest . . . — 3 Color Device Grades Cotton . . 69 | Army Demonstrates a New Gas How to Clean Paint Brushes — 198 3 A Mechanical Census Clerk. . . 70 Mask for War Horses. . . . 69 | Paper Parachute... . 129 3 Packing Cases Box Car Size . . 70 | Strange Facts About Sleep . . . 69 | Hintson Rubbing Down Varnish . 180 4 Soundproof Tiles Reduce Din . . 71 | “Televox’’ Acquires Voice; Me- Fitting a Support for Desk Lid. . 136 6 Mask Clears Catcher’s Vision . . 73 chanical Man Uses Phone . . 70 | Dummy Books Make Book Ends . 148 “ Science Slashes Coal Bills . 152 4 Politics Spurs Inventors . . 70 § Orange Crates Serve as Bins . . 148 , NEXT MONTH—The newest advances of science and invention ‘1 es . - 3 told in stories and pictures; home workshop features for the handy man, and special up-to-the-minute radio, he ed e e e * z housebuilding, and automobile articles n, v.

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POPULAR SCIENCE MONTHLY November 194 —— WHAT IS NEW THIS MONTH Table of Contents for November pan eee LEADING ARTICLES ArE You Puaysicatyy Fit to Fiy? . By L. H. Bauer, M.D. An unusual article by a leading Government expert A Famous Propuet or Science Looks Into THe Future By Alden P. Armagnac Coming marvels predicted by Nikola Tesla, electrical wizard CaMERA REVEALSSURPRISING Facts AsoutTGREAT MEN. By Carl Helm What celebrities have found out about facing the camera Sarer SIGNALS FOR Rattways . . By Charles Adler Beating night and fog with colored lights Opp EquripMENT oF Byrp’s MEN. . , By Edwin W. Teale What a two-year polar expedition takes along for baggage TRAPPED 330 Feet UNDERGROUND . . By Boyden Sparkes Miners buried alive deep in poisonous tomb saved by Uncle Sam’s trained rescue crews It’s HereE—rTHE ALL-STEEL House By Arthur A. Stuart Building homes like automobiles with standardized units JoHN KeENLON—FrreE Ficuter (Part 2) By Henry Morton Robinson The thrilling career of New York’s great chief MILLIons FoR MENDING STOCKINGs . By Edwin Ketchum How two brothers developed a $20,000,000 invention Sotvine THE Mystery or Twins By E. E. Free A fascinating puzzle of science nearly ended StrRANGE Cotors WE Can’r SEE. . By P. A. Carmichael Wonders and shortcomings of the human eye Hunt DIAMONDS,IN THE SEA. . . By Ellsworth Bennett Details of a remarkable salvage operation Citres in Race For Arrports : . .By Robert E. Martin Preparing for tomorrow’s aerial traffic j jams Queer Brrpvs WortH Mitiions. ... . The amazing story of South America’s guano New TRIUMPHS OVER FRICTION By George Lee Dowd, Jr. How engineers battle industry’s greatest waster SPECIAL FEATURES . . By Herbert Paus Cupping THE WINGS oF AN INCREASED SALARY. By Wallace Ames How to save money, told by the financial editor Tue Riegnt Way ToSavelce . . . . By Prof. R. D. Morrill Surprising results of Popular Science Institute refrigerator tests Our Reapers Say— ie ee Youne Jm . , By Edmund M. Littell A dramatic fiction story of a white-collar man in a steel mill ImproveD Homes at Mopest Cost . Pictures and plans of prize houses Hor Water WHEN You Want Ir New home comforts described by an expert How To Keep an Etectric Set 1x Workine Orver. By John Carr New trouble-shooting tips for up-to-date radios A Mopern Set in Easy Steps . By Alfred P. Lane Construction details of a one-tube “foundation” receiver MississipPI STEAMBOATIN’” . By E. Armitage McCann How to build the model stern-wheeler Buckeye State Bertsr Ways To Do Woopwork . By Edwin M. Love A B C’s of carpentry for novices and old-timers He Wantep A Usep Car Bargain . . .By Martin Bunn Gus and Joe warn of pitfalls that await the unwary buy er Trxy Monop.uane F.tks INpoors By J. Danner Bunch and Avison F. Koch A featherweight tractor model that you can build INTERNAL GRINDING . , By Hector J. Chamberland Practical shop hints for the machinist By Homer Croy Cover DEsIGN . By John E. Lodge 13 16 23 82 34 Astronomy Auroras Shot from the Sun . Hunting a Huge Meteorite How the Moon Is Measured . Two Solar Eclipses Coming . If a Comet Should Hit Us Automobiles Tests Glaring Headlights. ; Measuring Auto Motor’s Pick- Up , Luminous License Plates for Night Driving . Now—a Mask for Motorcyclists Twenty-Six Sleep in New Cross- Country Bus. Folding Cover Protects Rumble Seat Riders . New Traffic Lights ‘Allow Three- Mile Run : Know tor Car . : A Diesel Motor for Trucks . Getting Out of the Mud . Oil Failure Warning Light A Handy Jack Base . . . A Towing Axle from Scrap . Ten Dellars for an Idea . Cottcr Fin Extractor . Aviation Billion for Army Aviation. . Italian Airport Has First Two-Story Hangars . High School Boys Assemble Their Own Airplane. Heart Shape Keeps New U.S. Blimp on Even Keel . This Mail Plane Has First Aerial Letter Box : German Glider Thrills Americans “Flivver” Airplane Motor Weighs Only 60 Pounds. . First All Metal Dirigible Run by Steam . ‘ Speedy New British War Plane . Radio Beacon Conquers Fog. Silent Planes Invisible Two Cross-Country Records. Tons of Air Mail. . , He Couldn’t Come Down Link Air, Earth and Sea . , Lettered Flags for Air Messages. New Style Freight-Passenger Plane. Highest Beacon on Stamp ; How to Use the Air Mail Air Line Network Grows. Airport Traffic Signals Engineering Half a Ship Launched Build Highest Earth Dam A Huge Dynamite Blast. . Thousand-Ton Bridge Moved Eleven Miles on Boats... » ee New High-Pressure Boiler 58 58 58 58 48 18 62 62 63 64 November, 1928,Vol. 113, No. 5. Poputer Science Monthly is published month- New York under the act of March. Fi “9879: additional ‘en try as second-class matter at Cotmeae, © Illinois. Entered as second-class matter at the Post Office Department Printed in U. 8S. A. Copyright, 1928, Ld the Popular Science Puuitshing C Co., Inc. Single copy, 25 cents. Yearly ‘su at 250 Fourth Avenue, New York 2. aa .» by the Popular Science Publishing o., Inc. Entered as second-class m: r Dec. 28, 1918, at the Post Office at contents of t United States he possessions, and Canada, $2.50; foreign countries, $3. agazine must not be reprinted without permission. In pre, oe in its editorial columns numerous stories of new products of ap: clence, Popular Science Monthly does not underwrite the business method of the individuals or concerns producing cing them. Monthly articles for stock-sel President and Treasurer; R. C. Wilson, Vice-President; ng schemes is never suthersee. The fogs The use of Popular Eetenes Capen, > te Cole, Secretary. November 1928 —— — E Famou: Cont Champ Reco H The He Study « Chemis Reliefs Lal World’: Alumin Atom " Finds ] Longer Value i Saves | Model Model sengt Rocket Plan Model Late: Model Bod; Simplif Ship losis Antiqu Ship Thin How te Lo. | New One-Pi Tongs | Cookin Chest ] New B Antiwr Boar Clears Powe An All Now a Clot] New E Corkse Turns | Wedge: ture I Makes A No-§ Portab Two-P. New A Novel Sea | Flexibl vive: Time-S raph Machit Autom Hois Messag New § How New C en

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A ed ed POPULAR SCIENCE MONTHLY Exceptional People Famous _— Fights Fire in Auto Conte 18 a Globe Circlers Set 23- Day Record . . 71 Health and | Hygiene The Healthiest Age Found . 28 Study of New Disease Wins Meda. 29 Chemists to Cure Cancer? . . . 65 Reliefs for the Seasick . . . . 71 Laboratory Discoveries World's Largest X-Ray Tube . . 18 Aluminum Plating at Last . . . 28 Atom Thickness Measured! . -. 28 Finds Earth Cooling . . . . . 28 Longer Life for Heaters . . . . 60 Value in Waste from Gas . . . 68 Saves Vast Ore Deposits. . . . 70 Models Model City Gives a Lesson in Safety 62 Model Locomotive Hauls Real Pas- sengers . 63 Rockets Dri ve Model "C ars “and Planes. 65 Model Land Yacht Racing Is Boys’ Latest Sport Model Airplane Has ‘Clothespin Body 111 Simplified Eye Splice for Ship Models 113 Ship Model Contest Aids Tubercu- losis Work . St Antiquing Ship Models . ; Ship Model Book Ends Sawed from Thin Wood . . How to Build a Realistic Miniature Lo, Cabin 1u8 . 114 128 130 . 146 New Devices for the Home One-Piece Rubber Dish Scraper. . 66 Tongs Lift Eggs from Boiling Water 66 Cooking in Parchment .. . 66 Chest Keeps Shoes in Place. . . 66 New Broiler for Oil Stoves .. 66 Antiwrinkle Clamps Hold Troning Board Cover. 66 Clears Clogged Pipes by Water Power . , 66 An All-Purpose Electric Stove . . 67 Now a Combination Electric Sink- Clothes Washer. . . 67 New Electric Heater Warms Room . Corkscrew Brush Cleans Bottles . 67 Turns Fish and Pancakes. 67 Wedges Take Wobble from Furn- es « 67 New Processes and Inventions Makes Unburnable Paper . . . 29 A No-Stain Cigarette Holder . . 48 Portable Diving Helmet. . . . 48 Two-Purpose Go-Cart . . . . 48 New Automatic Egg Grader. . 49 Novel ema Samples Deep- Sea Water . 49 Flexible iets’ Record Sur- vives Auto’s Impact in Test . . 49 Time-Saving Holder for Stenog- rapher’sPad 49 Machine Can Count Peck of Coins 49 Automobile Engine Drives Power Hoist. . . 68 Messages Decoded Automatically . 69 New Sea Flea _— 80 Miles an Hour. 71 a New Color Movie Process 19 % yr Banker Invents a Camera to Record Checks . **Phone Box”’ Robbers. . Kite Carries Camera Aloft Radio Radio Motion Pictures Sent by Television . ; New Safeguard for Electric Sets. Comparing Loudspeakers How Panels Are Ruined . Uses for Old Radio Parts Solder with Rosin Se aS A BC’s of Radio. . Radio Pictures Received on Cyk inder Records . Radio Waves Cure Sick Mice Takes Movi ies of Bank Submarines Remarkable Salvage Feat in Raising Submarine Death Trap ~ * Sub Safety Device Passes sts Diving: Bell for Undersea Rescue. Submarine, Stuck in Mud, Saved oe Sister Ship ; 62 63 96 19 60 Unusual Facts and Ideas Biggest Oil Gusher Raindrops from Smoke . . Women Win Clothing Test . Developing Powdered Milk . X-Rays Probe Trees’ Insides ' Machine Checks Errors in Wind Tunnel Tests. Mechanical Putter Tests Golf Course Air Pipe Stores Hay ; Lumber Comes in “Packag es”. Invents One-Man Control of Bridge Traffic . U. S. Aircraft Carrier Tests Her ‘Big uns Television to Wield Baton Rubber Pads Silence Trains . Calls Atom Power a Dream . Tests Reveal Some Common Errors in Knowledge : The Rotor Ship Passes . Hundred-Foot Fire Ladder Raised by Motors . : Fs An Icy Stream in the Sea Dines on Feathers. . Huge Scale Sets Standard Army Pigeons to Whistle. The Three Riskiest Jobs . Canada Saving the Bison. Schoolboys Build World’s Biggest Kite . ‘ Sugar Cane 28 Feet Tall . “Fighting Jaw’’ Exploded .. Ocean Waterspouts Are Not Salty, Expert Finds . . : Fish and Wood Run Motors. . More U. S. Fire Tests Set Standards for Safes. . . Ants Help Trace Ore Veins : No More “‘Sea Serpents”. Discovers Alaskan Vi Voleano . Fawcett Slain by Indians Thirty Billion Cupsof Tea . . . Know Your World Berlin Clocks Hold ‘Telephone Booths Invents Railless Trains ; Does Gulf Stream Reverse? . Want a Name for Platinum . Propose Larger Golf Ball. . Six Heads on One Cabbage . Test Striped Street Light Birds Carry Periscopes_ . : Big Guns Traced by Air Puffs Powder Magazines Made Safe For the Home Owner The Handy Man. . 88 Hints on Puttying and Painting Windows. Garden Hose Protects Cord on Washing Machine . 104 How to Remove Stains from Felt Hats . . 107 Substitute for Rubber Stamp Pad . 111 Door Catches That Anyone Can Apply. 112 Removing Spots on Woodwork and Walls. . 114 How to Open Stuck Window Sash . 126 Repairing Ukuleles .. . . 129 How to Clean Plaster Casts . . 146 Hints for the Mechanic Home-Made Precision ater - . 86 Planning Ahead . . i. a Cool Work before “Miking” - . 86 Placing a Keyway. . . 86 How to Grind a Milling Cutter. . 86 A Thread-Cutting Tip . . . . 86 Use Calipers First . 86 Base Needed for Adjustable Light Bracket . 86 Making Arbors Is Useful Task in School Shops 122 Clamping Small Bars to Cut Off 19 Many at Once . 122 28 | Stamped Objects Made Without 28 Press... 122 28 Marking Calipers for Use in Meas- 29 uring Angles. . . . 182 - Patterns Now Lacquered . 132 29 48 48 | Ideas for the Handy Man 60 | Fireplace Spark Screen . . . 57 Trick-Performing Puppy. . . . 80 60 | Oil Rubbing Old Furniture . . . 90 60 | Two Cubical Block Puzzles .. 92 60 | White Lead Now Used for Mixing 61 Plastic Paint . 98 Blueprints for Your Home Workshop 100 61 | Turning a Lamp and Smoking Stand 102 61 | Paint Sprayer Built as Attachment for Vacuum Cleaner : 106 62 | How to Make Arrow Points . . 107 62 | A Primer for Yellow Pine . 109 62 | Cheaply Made Dust Brushes. 111 63 | Holder for Sharpening Spokeshave 63 Blade. . 114 63 | Casein in the Home Workshop . . 15 63 | How to Build Small Corner Cabinet 116 One Screw Acts as Hinge for i 64 ing Baby’s Gate ‘ 117 64 | A Jar-Filling Tray . 118 64 | Hacksaw Extension for Large Work 118 A Vertical-Legged Sawhorse . 118 64 | Trueing a Grinding Wheel . . . 118 64 | Old File Serves as Glass Cutter. . 118 Razor-Blade Knife. . 118 65 | Hammer Attachment Starts Nails . 118 65 | Brush Cleans Soldering Iron . . 118 65 | Flashlight Used as Trouble Shooter 118 68 | How to Make Small Wood Pulleys . 118 68 | Two Improvements for Workbench. 118 68 | Metal Dovetail Templet . . 118 69 | Ball Feet for Trays . . . 120 Uses Metal Cover to Bank Fire. . 121 69 | Old Pliers Adapted for Holding Thin 69 Pins . 125 69 | Unusual Carrying ‘Box Has Handle 70 at One Side... ‘ 125 70 | Planing Long Edges Straight . 130 71 | Practice Sharpening Tools . 134 71 | Old Saws Help Make Garage Bur- 71 glar Proof . 187 _ 151 | How to Reverse an Electric Motor . 142 . 155 & Arm Board Turns Chair into a Desk 144

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“Se ae nee eee = POPULAR SCIENCE MONTHLY December jy December 1928 WHAT IS NEW THIS MONTH Table of Contents for December second-class matter 2 Bees New York under the act of Maren. 3, 1879; additional entry as second-class science matter at Catereo. Tilinois. ee second-class mother 3 at X_. % Office of the os op Canada. Printed in U. 8. Copyright e Popular Monthly art Departmen Science msaniishing Co., Inc. Single AX. "25 cents. t - ~~ A 2. to President anc icles for st ock: scheme is never authort LEADING ARTICLES t Automobiles Winpitt Puane Maxes,Goop . . . . By Marcel Wallenstein 13 Button on Dashboard Jacks al Car . The story of the autogiro, latest air marvel Super-Highways Proposed . So Tury Wrote to Epison— . . . By William H. Meadowcroft 16 Know Your Car .. . m7 What the electrical wisard finds in his mail be — Runs with Water as a ubricant . ‘ 69 New Fvet Drives Giant ZEPPELIN . 18 Electricity Parks Cars i 69 Wonders of the Graf Zeppelin, world’s largest airship Would Improve Auto Lamps. 0 Rapio Ourruns THE Hurricane . . By George Lee Dowd, Jr. 19 Builds Auto from Parts of Twenty- How science seeks to solve tropic storms’ mystery Seven Others .. ‘ 73 Layne THE New Ocean CABLE . ; 21 ad — 10,758 Miles 74 An engineering triumph told in story and pictures a _ : a MecuanicaAL Men WatK AND Tatk . . ~~ = By Robert E. Martin 22 To Stop Rim Creaks. . 80 Marvels accomplished by almost-human automatons Novel Place for Licenses . 80 Romance Rives In THE AIR. . . By Michel Mok 24 A Handy Curtain Road Map 80 Humor, tragedy, and high adventure in pilots’ lives ‘ a ee 80 Wonpers From Motten SULPHUR .. . By John E. Lodge 26 sr te ne arma PO : = Striking achievements of industrial chemists Keeping Your Brakes Adjusted . 198 Wut Insects Starve Usto DeatH? . . . By Edwin W. Teale 27 Aviation The story of the world’s greatest war Sass eit teil ties Maxine Your Cara Better One. . . By AldenP. Armagnac 30 Test Visibility net li i a How thrilling trials test the modern motor’s stamina America’s New Baby Dirigible . . 40 Tue Last OF THE VIKINGS . . By Boyden Sparkes 32 Sheathed Wires End Static’ . 40 In memory of Roald Amundsen, explorer and hero Parachute Jumper Broadcasts . . 40 How Macicrans Do Tuer Tricks. . . . By George S. Greene 46 a = —— in Novel Craft . 40 Fascinating secrets of the mystic profession now revealed oe ta men’ sCrash .. @ et “Boosters” May Start Big Kitune Frees High in tHE Arr’ =. ~— By Henry Morton Robinson 49 Planes. : 41 Chief Kenlon tells of his most exciting battles “Extra Wing”’ ‘Lifts More 41 A GarpEN SALVAGED FROMTHE SEA . . . By Edwin Ketchum 51 New Oil Motor Tested 41 The amazing account of Holland’s triumph over the Atlantic ae ag teed nape : 41 Riskinc DeatH For InveNTION. . . . By Ellsworth Bennett 61 a - How heroes helped perfect a submarine rescue device ‘A New Map _ ot ll = Anywhere by Air Taxi. . 41 SPECIAL FEATURES ar Pick Up Mail on the Wing « 64 Wi Speed Up the Air Mail. . 64 Cover DEsIGN. . . . . « By Herbert Paus New “Flivver” Monoplane . 68 Mercer Prorits ror Your Money . . .By Wallace Ames 4 Arrest 219 Pilots for Air Traffic Vio- Timely counsel from the financial editor lations . . : 68 Cuoosine THE Ricut Rapio Set. . ByF.G. Pryor 8 Airplanes Aid Weather Man. 69 Advice of Popular Science Institute of Standards experts a rang a Height in ~ ire Engine Cleans Motors. . Our Reavers Say : 10 Over Mt. Blanc by Air . . . . 7% Sprightly comments from many pens Speedy Travel by Air Express . . 141 You Can Loox at Your House Berore You Butz It! By John Walker Harrington 42 i i How models and photography make it easier for the home owner hi muon MakinG A TELEVISION Disk . . . . . By John Carr 53 . ipping t viiaseuia — aaa 63 Practical instructions for experimenters in the newest radio art Abenioumn Replaces Copper it tn High- Appinc AN R. F. Stace To Our New Set. . By Alfred P. Lane 54 Tension Wires . . 64 Building a modern receiver in easy steps Huge Locks Nearing Completion . 69 New Nove ty FInisHes ._. . . « By Berton Elliot 56 French School Trains Women as _ Tricks you can do with paint and lacquer Li a Chain Weigh Nearl 70 Smart Girrs Any Man Can Make. . . By Herman Hjorth 57 7 Ton Each . - cig ear y "5 How to surprise your friends with modern, easily-built Pieces ee oe anim “ee Exceptional . cople E sp . Afghan Plays Safe When He Hunts 68 DITORIALS . . a a a ee He Collects Miniature Books . . 70 Can Your Car Seaxn THE Cas? . « . . «By Martin Bunn 8 eo tee Is eound of British Gus and Joe advise on winter motoring s M. P 71 Droveuey mk i 12 Nout Ropes Ptonen Mewsaty aumnetetty ated Sete epee a Cee, at faa cae . Inc. Ente 28, 1918, at the Post Office at ecpting ts editorial columns numerous stories of new ape of ap i M. Science Monthly does not underwrite the business methods uals or concerns producing them. The use 6 Son —- apen, I Prenmaser: R. C. Wilson, myice-President: A. L. Cole, Secretary. ———— ———a —— turil Weld G Hamper Interior Mounta: He Winning Stunt F How Mi Auto Ru Huge St Study Why Ac Lab New Per Stronger Largest Model ) Boy Bui Plane M How to sippi § Reader | Tiny Dr New New Tu Solid Fu Handy Opene Window Turning Washbo: Small W Holds R Makes ( Ice Crea Novel C Cordless Envelop Timer § New Co Electri

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— Se a ™ oe tw ed eoooooon POPULAR SCIENCE MONTHLY

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Plane Model Sets Lifting Record . 75 How to Build a Stern-Wheel Missis- sippi Steamboat 81 Reader Finds senn Model a Re- markable F . . 119 Tiny Drills ton Model Work. . . 121 New Devices for the Home New Tubular Peeling Knife. . . 38 Solid Fuel for Picnic . 33 Handy he Is Many-Purpose Opene 38 Window toe Foils Burglar . . « Turning Crank Cores Grapefruit . 38 Washboard for Silken Dainties . . 38 Small Washer Whirls Clothes Dry . 38 Holds Roast While You Carve It . 38 Makes Gas Cocks Foolproof . . 38 Ice Cream Frozen in 30 Seconds . 39 Novel Can-Opener . . . . . 39 Cordless Electric Iron . . . . 39 Cookpot Fitsin Stove . . . . 39 Envelopes Hold Dresses ._. 39 Timer Shuts Off Your Gas Heater . 39 New Compact Electric Ironer . . 39 Electric Shelf Saves Space . . . 39 New Processes and Inventions Spiked Barrier Halts Bandits . . 34 Pneumatic-Tired Wheelbarrow . . 34 Magnet Sweeps Tacks from Road . 34 Flashlight Like Pocket Lighter . . 34 Hand Tool Mends Silk a . 34 New Shearing Tool .. . St Machines Sell Stamps . . . . 35 New Vibration-Free Motor . . . 35 Electric Sealing Wax Appliance . 35 Device Binds Typed Sheets. . 35 This ‘ — Case” Holds a Phono- Ship Turbines Do Work of Half- Million Men 65 Twin Liners to Set New Records for a 65 Unusual Facts and Ideas

Fire I - “Tower Rises 220 Feet . 63 4

Queer Things Found Eatable . . 29 They Played Our Games Ages Ago. 36 The World Must Drink, and So— . 37 Cathode Rays Put to Work. . . 44 Monsters Unearthed . . . . . 44 Wealth in Nitrogen . . . . . 44 Drilling Largest Reflector . . . 45 The Blow That KillsaGerm . . 45 Five-Million-Year Fossil. . 45 Recording Street Noises in London. 45 Speedy AntiaircraftGun. . . . 62 Teaching with Movies . . -— Lame Hunter Invents Motor-Sled . 62 A New Fruit—Sweet Lemons! . . 63 Boxing Ring Rises through Floor . 63 Locusts Due Again in 19386. . . 63 Tons of Waste Paper in Fireworks . 63 Beetles Test Human Food . 63 Machine Unloads 1,000 Tons of Coal anHour. .. . 65 Waste from Stamps . . . . . 65 Know Your World. . 66 Vacuum Tube Controls Elevator . 66 Magnet Does the “Impossible” . 66 Road Signs in Pictures. 67 Making Type for 10, 000 Characters ‘ 67 Is Man’s Size Changing? . eo Birds Their Own Doctors... 67 “Cannibal Mosquitoes”’ Are Barred 68 Your Christmas Tree’s Age . . . 68 Subways May Carry Mails . . . 68 The First Patented Rose . . . 68 Peanut Vines New Fodder . . . 68 Round-Up Nets 70,000 Rats . . 69 Simplify Codes . . ss» a Queer Island Dog Kingdom oer 70 Huge Indoor Ocean Beach Planned 70 Sky’s Blue Measured by Chart. . 71 Metric System for China . . . 71 § The First Coin . .... . Wq ————t ——— r Invents Floating Turbine for Power ® Strange Glasses Turn the World Up- Geology ' — Waves. . 65 side Down . ‘ Molten Iron Poured from ‘Thermos U. S. History in Postage Stamps . Capturing Hidden Gold . pot ee 44 Bottle” Car. . . . 67 | Safety Tunnels. ‘ . World Growing Thinner? . | 62 An Improved D epth Finder . . 73 Painting the Towns Red. . . . 7 Hampered by Sunspots .. - 67 | New Cloth from Plants . 73 | Lamp Burns for 23 Years. 73 Interior Tides May Slow Earth. 73 | Mechanical Pole Setter Does Work Odd Machine Plays Sound Effects Mountains Commit Suicide. . © 75 vs of pve Pan ‘i , 74 . for the Movies ._. ; 74 ew Sound-Absorbing tone . . 75 ar Sands Tested for Roads... 74 Chemists Trace Weapons’ Source . 74 Health and Hygiene eaeainis iad Sana Sette Cases 1 otograpny Locomotive Uses Steam Twice . . 74 Winning against Scourges . 44 a er mR 45 A Mountain of Giant Timbers . . 75 Stunt Flying No Cure for Deafness 62 Leaf’ pe ne — - 73 Find Tiger Had the Toothache. . 75 ord ae Pas = = —— : 7 ; , a Photo Shows Size of Extinct Bird . 75 uto Runs A-Ray Machine at Home 65 Huge Steel Ball a Hospital ._. 67 —, Air into Brain for X- Ray Radio Why Actors Don’t Have Paralysis 71 | ABC’sof Radio. . . 52 For the Home Owner Trick Aerial Devices Worthless. . 52 A Novel Tube Shield. - + 52 | Pipe Clay Removes Marks from Wall b Di . Repairing a Loudspeaker . a 6: apr ....... . 96 La oratory Liscovertes Radio Fan’s Chorus of Speakers . 70 | Methodical Methods Save Time in His Keen Ears Test 250 Loud- Painting . - . 109 New Perfumes and Pickles . . . 44 speakersa Day. . . 71 | Replacing a Broken Sashcord . . 110 Stronger “Death Waves”. 44 | Huge Cone Loudspeaker . - + + 7 | Quick-Change Hinges for Storm and Largest Magnet Is Heavier Thee o Whalers Aided by Wireless . . . 74 ‘ Screen Doors. 114 Locomotive. . . 72 trap and Chain Prevent High-Chair Accidents. : 116 Shi ps Tinsel Causes Short Circuits. 116 Window Ventilators Made from Old Models World’s Record Speed Boat Goes 93 Cc Windshields. ‘ 192 Sion ta. 62 asement Weather Strips i ei. Cee Model Niagara Measures Flow. . 66 ss ae “Tell Me What to Turn” . . . 82 Craft Work for Christmas. 92 Santa Claus Figure Rings a Bell on Christmas Tree 98 Neat, Inconspicuous Fire Screen Built at Small Cost . . 100 Blueprints for Your Home Work- shop . 102 “a ae Handy Man Can Do with 106 east os Harden Plaster of Paris Casts 106 Shellacked Paper Keeps Air from Paint in Open Bucket. . . . 109 New Humpty Dumpty Dancing Toy 112 Airplane Bird Feeder Turns in the Wind 113 How to Make Use of Corrugated Fasteners. 115 How to Make a “Light “Tea Tray Stand. 120 Refinishing Asbestos Pipe Covering 122 Adjustable Cord Fastener Made from Washer. 129 Shellac Protects Cloth Book Bind- ingsfrom Wear... . 182