Popular Science Monthly 1928: Vol 112 Table of Contents

Page 1

POPULAR SCIENCE MONTHLY Moke Table of Contents Volume 112 JANUARY TO JUNE 1928 .

Page 2

ES Bee mitts = 7 2 ¢ POPULAR SCIENCE MONTHLY January, 1998 january, 1928 WHAT IS NEW THIS MONT Coast- Co Ameri This L Expert Table of Contents for January - I ae - q at LEADING ARTICLES t Aaptelbees Test Prouisition—Is Ir Goon ror Us?. . 9 Grow Weeds for Their Pollen . . . 40 Muscl By Charles A. L. Reed, M. D., and Haven Emerson, M.D. New Cotton Substitute. ... . . 41 A Hea How medical authorities view America’s biggest problem How Electric Plow Wars Against Guilty Macuines Tuat THINK . ; Herbert F. Powell 12 Crop Pests. .......... 50 Sh Mechanical devices that are “‘almost human” at last achieved ——— Machine Picks and Her V Success or Farture—It’s Up to You! . By Harry A. Overstreet 14 Ki Cc mY ak ee =e a 51 Fa Secrets of your character revealed by an eminent — wat Workd “top Venous... . . 55 Le BaTTLEsHIPs ON WHEELS—ParT ONE. . 16 Amateur Art By Rear-Admiral Charles P. ’ Plunkett, ‘U. S.N. Decay An untold Pos. ty in the history of the Word War A _ Team Fashioned of Canadian Race Way Don’t WE Fy? - By Cast. Podmend-Panlg 9 | . .. --- --- 58 He’s Our incomplete conquest of the air reviewed by an international critic Egypt in New EnglandSnow .. . 58 Magn Piants Put to Bep ror TuerR HeautuH. .By Edwin Ketchum 22 ——* Chill Liberty Statue. . . 58 Presst With the men who make growing things do tricks Th He es Ft eee” * a How tHE Wortp Wi Enp . .By Richard Alden Swallow 23 ee a? An astronomer’s amazing prediction, based ientific fact pages Minis &P manys On sce o eS Gin ae wa 58 : a nc 000 wed s ——— aaa nae 25 oe _— anical marvels of the Hudson vehicular tunnel Marvets WE Saw In 1927 . .. 26 Astronomy ! adh A year of new developments reviewed by science’s leaders Do Stars Flash Electricity? . . . . 41 Marconi Tetts WHat Ravio NEEps . . en — and ry eyo ee we = . At La a of ‘ , ‘ : By Prank Parker Stockbridge overnmen PWeReeP. . 2 8 et Nes uccesses that the “father of wireless” sees a ° Gems THat Work rorALivinc ... . By Orville H. Kneen’ 33 Automobiles .” Industry’s most costly tool—the black diamond No Muscle, Just Touch of Hand Puts AIRPLANES OR DrricIBLeEs? . By George Lee Dowd, Jr. 34 Steers ThisCar .. ... =. 48 ywaet The engineering war for air supremacy Car Abolishes Gear Shifts .... 48 ‘Elect Can You Say Wuat You Mean? . . By George McLean Harper 36 pees mee re ne coe 3 New Telling the world with 455,000 words — ea r}- . a es ee 48 Breas Inventions—Hossy or Great Men . By Aubrey D. McFadyen 37 Big eter may Sens a A How Washington, Lincoln and Mark Twain spent their spare time Moter Sieeneiities —_ . a Disp Maxine Money Oot or Scraps _. By Robert E. Martin 39 Mesuless Wieck Malte Cass. ... Form i —— rhage science is reclaiming waste sie Rubber Tracks Improve New Cater- bess LOW E OG Ra eee 49 Will giant machinery revolutionize farming? Where Is Motor Cemetery? .... 49 ae StasHine Your Coat BIL1s. . . . By John E,. Lodge 60 Motor Light Pierces Fog .. . . . 49 ; Where the fuel goes—and how to conserve it The Auto-Memory ....... 49 Thi Sam Loyn’s Puzz_e Pace . : Res de Limiting Truck Speed ...... 49 A Si Buty ror Urtuity First 1x Home. By John R. McMahon 67 Punctures Defied. ........ 51 Flat Why conservative design pays Police Club Traffic Light he ae kk 55 Deatu Hives 1x Your Garace! . By Martin Bunn 173 Two-Story Motor Houseboat Tours A timely warning from Gus and Joe of the gas menace P at oe a ea 55 An Aurnority Answers Your Questions oN Orn Heatinc .. 6 ~~~ My. a That St iit to a By Prof. Collins P. Bliss a Eurc ee 57 i ANNOUNCING THE New Business Firm or Grorce CasTL& AND Underslung Auto Creeper. . . . . 70 Dev; FamILy Pe eae REE hn SO © eee 4 Starting ing: . oe ae I Mysterious Ignition Troubles . . . 70 FICTION A Unique Note for Your Horn. . . 70 i Turee CAPTaAINs. . . By Karl W. Detzr 28 Automatic Battery Filler... . . . 70 AFi A vivid short story of the fireboat service ail Dea Warrune Wreets—Part Six . By Edmund M. Littell 42 Aviation New The thrilling conclusion of an automobile epic Plane’s Own Hum Aims Anti- Hat Aircraft Gun at Itself... . . 19 AL RADIO “School” of Dirigibles ... . . . 19 New “Guosts” In Your Loupspeaker . . By Alexander Senauke,E.E. 61 Light Gasoline for Planes. . . . . 55 How To Get SrartTep 1n Rapio By Alfred P. Lane’ 62 ering pane Drive Novel Plane’s ae — THE HOME WORKSHOP Baloo Kees Fane Ao = ‘. Easy-To-BurLp FURNITURE . By Herman Hjorth 75 eT ae . 687 How to Make Rapiator Covers . By Everett Eanes 76 Farm Service Station Assists - Micrometer MEasurine TABLE By Henry Simon 82 y Passing Flyers ........ 57 iy at 200 joes, Vet. 112, aie. 1 or NY Poteoes Mens yi geeeet s month- United Sree, te pe, et Canete, 4 £0; Soceien ——, 3 bre: Entered as seco nd-clase ma ter ’ Deo. 28, Suite at the Post OF Office at Sentiag te » its editorial columns ‘numerous stories of new products of applied New York under the act of Mareh. 3 1879; additional Ky A second-class science; Popular Science Monthly does not underwrite = business met matter at Chicago, Entered as second-class matter at the Post Office of the individuals or concerns poecases them. The use of Popular Science Department, Canada. Printed in U. *s. A. Copyright, “i907, by the Popular Monthly articles tor stock-selling schemes is never rs O. B. Capen, | Co., Inc. Single copy, 25 cents. Yearly subscriptions to - President and Treasurer; R. C. Wilson, Vice-President; A. L. Cole, Secretary.

Page 3

— POPULAR SCIENCE MONTHLY Exceptional People Coast-to-Coast Runner Has Motor | a aera 48 American Radium Queen... . . 59 This Lady Signs President’s Name . 59 Expert on X-Rays. ....... 59 Miss Mix, Soft Drink Boss . . . . 59 Health and Hygiene High Blood Pressure’s Merit ... 40 What Makes Your Heart Beat? . . 41 Test Children’s Hearing with New . a 41 Muscles React to Light. .... . 46 A Health Hat of Glass ...... 50 Guilty Microbes in Food Flee When eae eee 59 Her War on Bacteria Saves Farmers’ Fortunes. ..... . 59 Laboratory Discoveries Decay of Rubber Checked. . . . . 40 Race Determined by Hair’s Weight 40 He’s Weighing the Earth. .... 41 Magnet Lifts 30 Times Weight. . . 41 Pressure May Make Diamonds ... 52 Models and Toys Miniature Airplane Contest. . . . 47 A Sailboat on Wheels ...... 50 Electric Boat for Children. . . . . 51 Toy Balloon Spans Ocean... . . 54 Mechanical Baseball Thrills. . . . 55 At Last—The True Santa Maria. . 178 New Devices for the Home A Breakfast Table Egg-Cooker. . . 64 Rest for Iron Controls Heat ... 64 Puts a Balky Cork Back In... . 64 Ornamental Candles of Glass . . . 64 “Electric Presser Is Home Valet . . 64 New Cork Aids Pouring .... . 64 Bread Receptacle Has Slicing Attachment ......... 64 Dispenses Coffee by Turn of Crank. 65 Forms for Gloves Aid Washing . . 65 Transparent Percolator Makes Boiling Visible ........ 65 Safety Button on New Electric Iron 65 age Laundress Does Varied Ms oe a Se os, ula 6 We 65 This Milk Bottle Cap Won’t Leak. 65 A Simple Way to Banish Odors . . 65 Flat Electric Cord Runs Under Rugs 65 New Processes and Inventions Europe in Four Days Promise of : I ait nae Sh ie Xe Ww 19 Device Warns of Poison Gas in Hudson Tunnel ....... 40 .Luminous Telescope Sights . . . . 46 “All-Rubber Speedboat Built. . . . 47 A Finger Ring Pencil ...... 50 Deadly Power of Rifle Increased . 50 New Circular Padlock Hat Rain Shield Fits into Purse . . 50 A Lighted Pencil New Telephone Is Racket-Proof . . 51 First Aid for Silk Hosiery .... 51 Finding Broken Light Wire . . 51 Concrete Walls Smoothed Like Stone 52 —— Manicure Machine Saves ime + a Storage Battery Locomotive _) eo Novel Fireproof Wastebasket .. . 53 Axles Made Four a Minute... . 53 Telegraph Pole “ Medicine”’ In- jected with Huge Needle ... 54 Tiny Car Warns of Big One ... 54 Photography Movies of Airplane’s Wake... . 41 *Hare’s’’Camera Films Dogs . . . 47 Radio Loudspeaker Weighsa Ton... . 54 Ready-Radioed Homes... .. . 54 SOS Calls Absent Operator ... 57 Unusual Facts and Ideas Reef Plugs Holesin Ship. .... 19 Edison’s Radio Debut on Lamp’s ‘48th Birthday Woman’s Brain Vindicated . . . 40 Test Weathering Qualities of Paint . 40 eginning Next Month “THE MOVIE MAKER” A Thrilling Novel of Men Who Work Miracles Behind the Screen Zero hour! Over the trenches with fixed bayonets—running, stumbling, falling across No Man’s Land, the gray dawn lit with red flashes or darkened by rolling dirt clouds as big shells plow into the earth and bury the living and the dead— Yet not a man lost on either side! For the battlefield is a silver screen and the tall trees uprooted by shells are only two feet high. But the dough- boys are real men, not pygmies. HOW DO THEY DO IT? In this surprising serial story, starting in next month’s issue, you will be told exactly how motion pic- ture producers perform their wonders by technical and camera trickery. Instead of looking at a motion pic- ture screen, you will see behind that mirror of shadow and light—view the movies from the inside. The most jealously guarded technical secrets will be revealed and all told in a vivid story that will carry you along by its swift action and fascinating characters. You Can’t Afford to Miss It Ask your dealer today to reserve your copy of the February POPULAR SCIENCE MONTHLY, on sale Jan- uary 2. r Dog Understands 300 Words ... 41 Old Roman Furnace Found in English Garden ....... 46 Stock Ticker Must Speed Up .. . 46 New Zealanders Oppose Burial of Identity in “Australasia” ... 46 Hammer Lifts a Motor Car... . 46 Why Furniture Weighs More in Summer Than in Winter. . . . 47 Huxley Skeptic on Feminism ... 47 A 15-Mile Butterfly Swarm. ... . 47 Metric Measure in U.S. Asked. . . 53 Origin of Life Is a Riddle Yet Unsolved, Say Savants .... 58 Head-Hunting Laid to Women. . . 53 Labor Saved by Machine Age. . . 538 German Shipyards Come Back. . . 54 What Do You Want to Know? .. 54 Chases Flies 9200 Miles. ..... 54 Grass Saves Coast from Sea. . . . 54 The World a Steam Engine?. . . . 55 Roads of Tinted Concrete. . . . . 55 A Garden of Invisible Light . . 56 Women Are More Like Apes Than | Are Men, Says Savant. .. . 56. Arctic Snow Less Than Ours. . 56 How Much Do You Know of the ‘World You LiveIn? ..... 56 Scoop to Dig Up Sea Floor . . . . 57 For the Home Owner Want Advice on Oil Burners? . . . 52 Hints on Handling and Cutting Ge. cs me 6 are Sloe 86 Screening Registers ....... 88 Thawing Water Pipes. ...... 88 Ventilating Screens ....... 88 How to Remove Shingles Neatly . 95 Hints for the Mechanic Quick-Change Grinding Set-Up .. 84 How to Work with Copper Tubing. 84 Oversize Wheels Reduce Cost of Cylindrical Grinding... . . 84 How Two Costly Snap Gages Were ae eee Br. Timesaving Jig Aids in Drilling Roush Siege . sw ws 2h Portable — Boiler for Thawing a ee ee Wire Washer Takes Up Lost Pes > ok 0 >. 6 eo oe 93 Ideas for the Handy Man Modern Ways to Paint Chairs. . . 177 Hand-Wrought Hardware. .. . . 80 Amateur Stage Carpentry—Build- a aE Eg 81 A Gift Puzzle for Children ... . 90 Handy Paper Funnels Made in an MOE. so se oe ee 91 What Is a “Hot Acid Bath”? . . . 91 Mixture Loosens Glass Stoppers. . 91 Household Dyes As Wood Stains. . 91 This Little Turtle Always Heads | Fey a, oe 95 Adjustable Book Stand. ..... 99 Shoe Shining Attachment for Maenes Ceee wo ea 100 — for Your Home Work- a OY ae ae ES hy! 1 Two Deetal Pieces Built from an Old Chiffonier. ....... . 104 Pipe Fitting Used to Make pS ee ear ae 104 Hundreds of Striking Articles in This Single Issue Tell the Latest News of Science and Mechanics I)

Page 4

~¥

ne an 2 POPULAR SCIENCE MONTHLY Februaryiil . WHAT IS NEW THIS MONTH 14 ee aad ; \ Table of Contents for February a4 3 B. LEADING ARTICLES | T Agriculture ita Nine Wonvers or THE MoperN Wortp .- By Edgar C. Wheeler 11 X-Rays May Beat the Cotton Pests 49 "! Nine up-to-date marvels to replace old seven ae r arecry to 7. Crops . 49 : Sos Toys Tuat Save Mituions_. By Alden P. Armagnac 17 ocd edgy wed geese ed 50 : How models tell engineers if bridges and buildings will sag on Tone ae d Fruit = y Nations Jorn To Sounp Seas . By James N. Miller 19 . “73 s at Ss bottom - the ocean i ‘ Automobiles 3 ‘ARS Howp Secret or Lire . y Arthur A. Stuart 20 i ' Why Pupin, eminent scientist, believes in God. Bore! —: oe sale 48 ‘Stens Parntep on THE CLoups . 22 Test Car Helps Improve Headlights 48 : A 4,000,000,000-candlepower advertisement — — = Automobile” Driven by Wuat Doctors Don’t Know Asout Diet By T. Swann Harding 23 “ay ike 54 ; Startling facts from the laboratory of a food chemist Valve Grinder Saves Labor os Wine Stots Make Panes Sare . By Edwin Ketchum 25 Know Your Car 56 An invention that may revolutionize aviation New Guards "Shield People ‘Car Founp!—A Wuote New Wor.p Unper Oor Feet . Passes 56 By Myron M. Stearns 26 Elevator Lifts Broken Car; You ‘ Learning about the soil we walk on Needn’t Crawl Under . . 57 a Gicnis tar Wealecn 98 — wy Rewry se vo in Fog . 57 . . . ois . . . . . . . . . t A Ea il 57 By Rear Admiral Charles P. Plunkett, U. S. N. ‘onone ec Peg > sil 59 What happened when the Navy took to dry land ; Coal Gasoline Wins Races 61 - Exit—rtue Torcn Bureuar . By Allan O’Hara 31 Sharp-Turning Car Wheels . 61 New metals that fool thieves Le tar py Bus. . 62 Is TeLepatuy ALL Bunk? , By Kenneth Wilcor Payne. 32 A a . aes Feet | How scientists look at “wireless thought” < Bor Use cn Steep Hills 72 Cuances To Get Ricn Never So GREAT ‘ith oor 35 a — for _— 72 Yy enry mit. iams ires Brace Garage Door 72 Why millions await discoverers and inventors Ten Dollars for an Idea . 72 : Dopeine DEATH ON THE WIREs . . By Robert E. Martin 37 ° ae Hazards and thrills in the lineman’s job - ee “Waar Car Sua I Buy?” By Martin Bunn 38 ew Aerial Mapping Device 48 Help Gus select an automobile and earn ten dollars ee ne — e 50 Way Don’r Ws. Fry Srraicut Up?. . . By Ellsworth Bennett 43 ne ee a7 Where the helicopter stands today, revealed by an expert : Is Your Son Lie You? . By L.G. Pope 45 | Tage Drove Food to Caravan What a monk’s laws of heredity tell modern biologists Novel Beacon Challenges Fog 59 Forp GamB.es ror Huce Stake . By Hyatt E. Gibson 46 New Airplane Self Starter. 59 The modern romance of the search for rubber Dies Setting Altitude Mark. . 60 - How to Setect Your Lumsper . . . . ByJohnR. McMahon 64 Plane’s Sideways Drift Is Found A by Hints on picking materials for strength, beauty, and wear New Device . ‘ 60 Sam Loyp’s Puzzie Pace 5 74 “Foolproof” Plane Tested . 61 Wuat Is Haprentne To Rapio By Alexander Senaule, E.E. 8 Novel Dirigible Propelled by Air . 62 OvERHEARING A TaLK Asout INVESTMENT TRUSTS 4 Ocean Plane Model for 50 Passengers 63 FICTION Exceptional People Tue Movie Maxer—Part One... By S.W. Newmeyer 14 Blind Man Is an Inventor 62 An amazing novel of the screen’s miracle workers 4 a a ita Ps Wuistie-Pounk . . By Paul Coonradt 40 nglish Vicar Is Expert Silversmi a Courage, hate, and red-blooded youth i in a logging camp Woman Wields Sledge on Rock Drill 68 . RADIO Health and Hygiene Rapro Norses You Can Cure By John Carr 69 —_ dig om ar . = How To Bump an Exectric Ser. . By Alfred P. Lane 78 Medicine Gains New Ground in THE HOME WORKSHOP Machine Sells Medicine’ p Slot Machine Sells Medicine . & A Prrate’s Cuzst To Hotp Your TrREasurRES ..... . 77 —— mK — or Self- pa ; assaging Machine : ScENECRAFT—PAINTING THE SET . By Andre Smith 80 Ges Gass fer Gentes 55 Be Sperepine Up Your Latue Work By H. L. Wheeler 84 y “Radium Bank” Projected . 57 = 7 : Vol. 112, No. 2. Popular Science Beonehiy te pubtebes » month- United States, its possessions, and Canada, $2.50: foreign countries, $3. The & SR escent Rk ane R tees Sater csaaminem mt acre ie meer, ae * New York under the act of March ns, “1879: additional as -class §§ science, Popular Science Monthly does not underwrite the business i - ce § Taster at Caleago, iilingie. Entered ag second-class matter at the Post Omics of the individuals or Concerns producing them. The use of Popular Science ape: Science Publishing Co., Ine. Single copy, 20 ccuts. ‘Yearly ‘subscriptions to President and Treasurer: RC. , Vice-President: A. L- Cole, Secretary:

Gian Coby New Prie: rer ry _ eer: 6

Page 5

ary, i 9 9 0 0 3 Veo = OO ee

TB february, 1928

POPULAR SCIENCE MONTHLY

' ——— Laboratory Discoveries ¥ - —- Many Parts of Body 6 : Pay a and Carry On . 61 63 | Photographic Film of Wood . 59 —, Real Train Uses 15-Inch ; 61 63 : Sea Plants Make Sugar ip he 81 Radio Probing into Volcano’s Past . . 61 Radio Echoes Are Explained . 48 82 yo sor Station’ Is Pride of tudents . , 60 A Method for 8 et Ra aS a For the Home Owner ip-Table Cone Speaker . 60 Your Radio Tool Kit 68 mary onnrach — from Your Warm 66 Automatic Filament Control 68 Keeping the Hands in Good Condi- 66 A B C’s of Radio . , 68 tien. Vea ie sa 66 Which Power Tube? . 68 Regluing Chaie Rungs 2 ie " 102 66 : Ships 65 | New Navy Monster 3, | Hints for the Mechanic ee Sister Ship 4 | Milling Square Ends on Cold Rolled 67 | Mile-a-Minute Boat. . 34 Measuring § Shoulders of Studs . . 86 67 | World’s Largest Submarine Is A Prickpunch Magnifier xe 67 | | Launched $4 | A Tool for Packing Valve Stems | 86 A Nonsinkable Boat . : 34 Hardening High Speed Steel "96 67 | Pulverized Coal Drives Ship 51 | A Quick Way to Count Small ll Gear 67 | Electric Liner Sets U. S. Record 51 Teeth 107 67 a . 7 . ‘ U LF d Ide nusua acts an as ‘| Ideas for the Handy Man Why People Wear Clothes 48 Overcrowded Earth Foreseen 48 | Making a Bookstand and Seat . . 88 Chemist-Made Personalities . 49 | A Kitchen Plant Stand . . . . 88 50 | Earthquakes Laid to Moon . . 49 | AGiftGavel . . OS ae 50 | Earth Rotates More Slowly Each Cocoanut Ash Receiver . 88 50 Day, Says Astronomer : 50 | Blueprints for Your Home Work- ‘Fingerprinting’ Muffins 50 Shop ; 93 51 sg Any Questions? 50 $ Rosin in ‘the Home Workshop ; 108 Are You Abreast of the Times? ’ bd e e If you can’t answer the questions below, turn to the page indicated 11. Is fried food healthful? (p. 49) a haven’t helicopters gone up thousands of feet? p. 44) Why does a telephone lineman take a running jump when > (p. 45) he mounts an electrically charged pole? (p. 37) How mane a ‘ wood are commonly used in home building 65 15. What is the best way to kill moths? (p. 52) How does science make its own “divining rods?” (p. 56) How does ey electrical savant, believe life came to the earth? (p. 21) What kind of metal can’t burglars’ torches pierce? (p. 31) . Why were clothes invented? (p. 48) . What billion-dollar industry sprang from a college boy’s 12. What nation has the largest submarine? (p. 34) 13. - What is the climate seven miles above the earth? (p. 57) 14. . What is the principal problem in constructing an electric Why has an inventor produced luminous golf balls? (p. 53) 16. What are the nine wonders of the modern world? (p. 11) 17. - How much of yourself could you do without? (p. 61) What is the dam that surprised engineers when it didn’t 18.

Page 6

2 At POPULAR SCIENCE MONTHLY az March, 98 = March, 1928

WHAT IS NEW THIS MONTH

Table of Contents for March

LEADING ARTICLES Maxine Supmarines Save. . ._ . By John Walker Harrington The tragedy of the S-4 sinking, and what it taught the Navy Is Lost Exptorer Now JunGLe Gop? . By Francis Gow Smith Weird possibilities hinted by a mysterious disappearance Way WE Are Immune To Some DisEasEs . By Lidda Kay First steps that foretell greater medical conquests to come “We” Smaso More Recorps. . . . By Ellsworth Bennett The amazing mechanical performance of Col. Lindbergh’ s plane RoMANCE JAMS THE Loc JAMS... : By Arthur Grahame What veteran lumbermen do when the spring drive comes down Sperry—Competitor oF THE Sun . By Frank Parker Stockbridge The story of a mechanical genius, his searchlights, and his gyros Wauere Dip You Catcu Coup? . By P. A. Carmichael New things doctors are learning about contagion and overeating A New Broop or Linpsercus . . By Maj. Gen. James E. Fechet How the Army is teaching fledglings to fly, Brits or Oip Ciay Kick Up a Bia Row _.. By George Lee Dowd, Jr. An archeological “find” that started a scientific battle Tue Rea Story BEHIND THE New Forp Car . By Edwin Ketchum How one man’s ingenuity met a great industrial crisis Wuat We Owe To NEwron . . ._. By Arthur A. Stuart The story of a young farm boy who explained the universe Triumpus or Rapio’s “Hams” . . By Alden P. Armagnac How amateur tie-ups span continents and serve nations Sea Waves to Drive Novet Power Piant How a Navy engineer would harness the ocean’s energy Tue Worwp’s Greatest TIMBER Crop . A single island’s colossal industry Our Barttr.iesnirs ON WHEELS . By Rear Admiral Charles P. Plunkett, U.S. N. How American naval guns turned the tide in France Rossinec Foe or Its Perus . . « By Norman C. McLoud Latest strides of progress to aid navigators Coat Too Userut to Burn . . By A. C. Fieldner A noted chemist’s vision of the treasures within black lumps Piants Mave sy CHEMISTRY Laboratory creations that almost outdo nature He Resvuitt His House ann Savep $6,000 . By John R. McMahon Making a convertible home for one or two families Wuen You Buy a Car— By Martin Bunn Gus and Joe tell how “service” and “trade allowance” affect your choice Decipine Wuat Toots ArE Goon. . By F. G. Pryor Our Reapers Say—. oe es FICTION Aut MerTaL. . . By Andrew A. Caffrey A high-geared story of an air liner, a girl, and a dramatic rescue at sea Tue Movie Maxer—Part Two y S. W. Newmeyer Thrills that the cinema audience never sees, in a ‘ialaaien novel RADIO Locatine Your Rapio Trovus.e A Gute 1n Cxoosine A Rapio Set Powertne Your E.ectrric Set THE HOME WORKSHOP Tue Suvptest Fiyine Mover . By J. D. Bunch and A. F. Koch rr i OENWAWS QMGMIES. . . 5+ se 6 6 te lt le Tricks OF THE TOOLMAKER . By Hector J. Chamberland By Alexander Senauke . . . By John Carr By Alfred P. Lane 13 16 21 24 26 28 29 31 32 3+ 39 41 42 +4 47 49 56 71 74 10 18 36 68 70 82 81 84 88

Automobiles “Road Yacht” Complete Home . Who Is Father of Automobile? . Paving Put to Test ‘ ‘ Open Car and Sedan in One . Garage Door Dogs Novel One-Wheel Luggage ‘Carrier for Motor Cars . . Know Your Car New Paint Striping “Device Lets Anyone Decorate Auto. . .. A Bed in a Motor Car A Quick-Acting Auto Jack Back Through Garage Doors. Tool Boxes in the Floor . Swinging Stop Light . Ten Dollars for an Idea . Astronomy Sun’s Collapse Predicted Big New Meteorite Studied. Star a Pulsating Gas Bubble . Aviation Oil Engine and Cheap Helium May Start New Flying Epoch . . . Navy Issues.Ocean Air Maps _ . Globe-Circling Dirigible Nears Com- pletion . ; First Aquatic Air Glider . Barbed Anchor Aids Airships. Caterpillar Landing Gear__.. First Floating Dock for Seaplanes * Aerial Signpost” Directs Flyers Seaplane Can Go 4000 Miles. . Planes Use Costliest Wood at $600 for Thousand Feet .. New Light’s Colored Rays Fight Fog Engineering Artificial Gales Test epee Models. . , Dam Holds Water with Water . Plan to Utilize Moon Power Twin Panama Canal Foreseen Dam Is Engineering Feat . . Heating Plants on Roofs Next? . Steam Well Power Unlimited A $275,000 Floating Road _ . Bridge Nearly 500 Feet High Engineers’ World News Service . Monorail Cars Under River . Health and Hygiene Skeletons That Teach Health Blood Pressure and Motoring How Colors Aid Eyesight Heart No Pump, Says Doctor Why Boys Eat So Much New Gains in War on Disease Perfumed Anesthetic Is Latest . 50 52 59 50 53 53 54 54 55 58 58 58 64 50 53 _ 138 - 142

peer 928, Vol. 112, No. 3. Popular Gotence Manthiy is published o menth- United States, its possessions, and Canada, $2.50; foreign countries, $3. Avenue, New York, = Xo oF ‘opular Science as second-class m. New York under the act of March. 3. “9879: additional ‘entry as second-class matter at Eatored scien as second-class matter at the Post Office of the fe individuals or concerns producing Canada. <—_ . 8. A. Copyright, 1927, 7S e Popular Monthly articles for stock ubscriptions to President and Treasurer; R. Publishing Co., Single ‘copy, 25 cents. Yearly's contents of this m # Dee. 2, 1918, at the Post ‘Office at senting in its agazine must not be rep: schemes is never authorized. O. B The rinted without permission. In re: editorial columns numerous stories of new products of — ce, Popular Science Monthly does not underwrite the business method: them. The use of Popular Selence ‘apen, lison, Vice-President; A. L. Cole, Secretary.

— =

10. 11. 12.

Page 7

—e ee i i i Me eo POPULAR SCIENCE MONTHLY Se — ——— : 4 @ Ending Nui f Wet Umbrella . 60 % How Much D Toe See er or uwscoverl g Nuisance 0) et Umbrella Ow uc ‘o u Kno e Laborat y D ’ ernes Novel Golf Scorer in Watch Case 60 World You Live In? , 63 Health Rays — Clothes’ Holes What a Harmonica Grows Up to Be 60 | Tree Stump an Incinerator 63 Gi Alone, Tests St XRay ian om Bundle-Tying Device. : 61 | Old Cement Mine a 40-Acre Mush- Sky Plays with Sound Waves 62 A Slot Machine Soda Fountain . 61 room Farm : 65 Chea p Cornstalk Walls Now 63 a gong 4 in 61 ——- Spot” I Is 452 Below 65 Sugar Produced by Chemistry a ove w Cuts iles in 50 one Insulators’ Bath Day 65 A Wireless Electric Light 8 | eee ” Playing Cards in “Tile Form Defy For the Home Owner New Devices f or the Hlome ante th al ae = Filling Bathroom Cracks... . 102 New Knife Grinder 66 | A Mechanical Professor. . 63 | How to Conceal Cracks in Plaster . 102 Dane Knob Burglar Alara og | Eisotric Signs Flash Paris News Plumbing Hints for Home Owners ". 180 oor R Bulleti . umbing Hints for Home Owners . 2 3 in Novel Med- a Optical tes Gages —. - 2 H . f he Mech icine : 7 ° ‘ P ints for the Mechanic Bread Cabinet Hides Goodies in Secret Compartment . . . 66 Phot ax hotograp hy Using Gears for Indexing Work on Speedy One-Hand Flour Sifter 66 Toad Chall — oe - 51 the Grinder ._. 90 Reversible Broom Saves Bristles 66 enges Camera's Speed 63 | Depth Gage for Lathe Drilling . 90 — ong Fills Your Radiator - Radio ee Ht RP * 90 Table a Radiator i inOne . . 67 oy eg in Each Room . 55 Metal . 90 Keeps Your Clothespins in Reach . 67 ” io Waves Never Die? 65 arto a Joint for Floating Reamer 90 Fixt E the. 90 Nord er Oe Meat, “OG | Unusual Facts and Ideas | ‘ie Mature ior Magne bate New Cooker S Fl : 67 | Was America Man’s Birthplace? 50 Makes "ieee ff Veer Gleae Ale Creeping Baby Is Trotter. 51 Ideas f - the Handy war Bottle ———— ——a —— in Arctic . 51 a to Care for hyo a _ Stew Laundey Bag Hold _ 67 nsects Turned to Metal . 51 ow to Lay Out Your Own Shop or weds Sag ry ag Holder Chairs. 6 Bottle Traces Ocean Current 52 Decorative Metal Work . ... 92 Men gging Up red Chairs. 67 ~— =: Name — Animal . 52 ee aya Set. . . 94. wastika May Trace Races to Lost ools—Pride of My Farm . . . 96 aa tect one and Pacific Continent . . . 52 | Wood Turning Simplified -. . nventions _ | Self-Sprinkling Roads Built . 53 | Blueprints for Your Home Work- : Sound to Light to —_ Deaf Sea —_ Caught with Nets . 53 ™ .. Pe PON, 106 ; 51 | Five-Mile Road of Gold Ore . 53 aint Removers You Can Make... 112 Saw Uses Sand to Cut Rock . 52 | Junk Makes Queer Golf Links 53 | How to Remedy White Paint’s Gear-Wheeled Roller Skates... 53 | Mail Trapped by the Desert . 55 Yellow Tint. . 112 Portable Track for maiied Grey- Oil Ditch a Fabric Pattern . 55 | Horseshoe Magnet an Aid in Home hounds. ; 54 | Smaller Dollars Save Millions 55 Workshop. 114 Wheels Made of Cotton . . 54 | Making All Russia Gas-Proof . . 55 | Keeping Nickel-Plated Hardware New Way to Tell Time in Bed . 58 | Building Wreckers Imitate ——- Bright. 114 New Chemical “Ice” for Rink 58 sion . é 55 | A Small Plant Stand aguas Can Steel House Erected in Little Over Hens Smash Laying Records 55 Make. .. . 120 Three Hours : . 59 | Toy Car Claims Speed Mark 58 | Dowel Sticks As Xylophone Keys . 195 Foolproof Elevator 59 | Baboons As Servants Advised 58 | Carpenters’ Level Used for Sighting pean | bows Lig mek * 59 | Trees Gage Wind Velocity 134 Long — ata 5 . 129 onograp ieves "Phone Girls . 60 | Any Questions? . 59 | Razor Blades Ai elers . 129 A Vest Pocket Ash Tray. . 60 | Bright Children Not “Queer” 59 | A Movable Saw Table. . 130 Eggs Kept Fresh by Daily F Ride on Old Maps Make Lamp Shades 62 | Walnut Shell Made into “Comicull” Ferris Wheel . . 60 4 Fingerprints Identify Races . 62 ~ Elephant. ; . 181 Are You Abreast of the Times? If you can’t answer the questions below, turn to the page indicated Who is said to have a prior claim over that of Gottlieb Daimler, German engineer, as the “father of the automobile?” (p. 54) To what diseases can man, today, make himself immune ? What is the proper ta to bend bamboo, in making model p. 81 What planet shoots huge volcanic bombs into space? How do new species of animals get their names? (p. 52) “= is the American factory which, making wood cohol from coal by a new process, may supply the whole United States? (p. 49) What “important archeological discovery” is called a hoax by scientists of high repute? (p. 31) What chemist has at last duplicated nature's feat-of mak- ing sugar and starch, as plants do, from water, sunshine, and carbon dioxide? (p. 64) Where does the Army Air Service oot young men to fly? (p. 29) How do lumberjacks break a log jam when they can’t find the key-log? (p. 24) 1. a y pressure any connection with auto accidents? 13. p. 51 2. Who will transmit for you, without charge, a radio message to anyone, anywhere? (p. 39) 14. (p. 22) 8. What kind of a cold is not contagious? (p. 28) on a 4. For what is Sir Isaac Newton famous? (p. 34) airplanes? 5. Why are we to have smaller dollar bills? (p. 55) 16. at 5 -6. What star is believed to be a pulsating bubble of gas? ‘ (p. 59) 17. 7. Why did Henry Ford take small boys riding in the first 18. of his new cars? (p. 32) 8. What is the result of the U. S. Bureau of Standards’ 19 rg 7 investigation to find uses for farm waste? . p. 63 20. 9. Where is the coldest spot on earth? (p. 65) 10. How can you use imaginary lines to make your house a convertible one or two-family dwelling? (p.71) 21. 11. What is the latest invention of Elmer Sperry, perfecter of the gyro? (p. 27) 22. 12. How does a new type of dam hold back water with water? (p. 58) Can the waves be harnessed for electric power? (p. 41)

Page 8

POPULAR SCIENCE MONTHLY WHAT IS NEW THIS MONTH Table of Contents for April LEADING ARTICLES LiypspercH—How He Does Ir By Caleb Johnson New light on the world’s most famous airman TunneEv Burt, THEn Sunk In Bay . . By H. H. Dunn An engineering marvel of the Pacific coast TELEVISION BROUGHT INTO THE Home . . By Alden P. Armagnac “Looking in” as you “listen in,”’ with first practical small outfit Dancers Tuat Lurk mn THE Famity IceBox . . By Frederic Damrau, M. D. 13 19 20 22 Startling conclusions from a Popular Pw da Institute report on house- hold refrigerators Sea Wurrrets THRItt In Newest Sport By Ellsworth Bennett High spots of a sensational outboard motor boat race “Can I Arrorp AN AIRPLANE?” . . By H. C. Davis “— a nation-wide survey revealed about the dollars om cents of private ying A LoupsPEAKER For A Mitiion Ears . ' How engineers tested a horn that can be heard a mile Puiants Tuoat Sex, Fee, anp Tornk. js. By Arthur A. Stuart Amazing discoveries of a famous Hindu botanist Skyscrapers Burtt Wurtz Tenants Wait. Wonder feats in modern building construction Beatinc DeaTH AT THE SEA’s Bottom Divers’ thrilling moments beneath the waves Fontaine Fox Insists He Is an INVENTOR A prominent cartoonist’s own story of his “contraptions” Hypnotism Gives Arp To SuRGEON . . By Grover C. Lange Banishing pain without anesthetics Keeprtne Trams Out or Wrecks . . By Jesse F. Gelders How new inventions have lightened the dispatcher’ s burden Fiyrmvec WounpvED Troops THROUGH SNIPERS’ BULLETS . By Hyatt E. Gibson By R. C. Upjohn . By Peter Vischer By Robert E. Martin A marine aviator’s heroic exploit in Nicaragua How Do Tury Know Asout Atoms? By George Lee Dowd, Jr. A simple explanation of the newest conception of matter Hourriine THrovuGs SPAceE IN A PARACHUTE Hair-raising glimpses of a parachute-jumper’s life SrranceE Rapio Devices Locate Buriep TREASURE By Albert Henry I Kingerly Modern divining rods that really work Pans To Cross Ocean IN 60 Hours Will this new craft revolutionize ocean travel? Wonper Srortes IN THE MakING By Frank Parker Stockbridge What science’s leaders talked about when they got together How to Start Your GarpeEN Now. .. . Timely pointers on preparing for summer crops Derapty GARDENS IN FLy Foorprints New dangers in insect tracks revealed by the microscope A House HasIts Face Lirren. . . . By John R. McMahon How ingenuity transformed an old dwelling Unmaskine Garace “Gyps” What inexpert car repairs cost you Our Reapers Say— ea a How You Can Tett a Goop Neasieailiaatials ; By L. G. Pope . By Edwin Ketchum By E. Bade By Myron M. Stearns 25 26 28 29 31 32 34 36 37 39 42 43 45 49 50 66 67 71 74 10 8 t & RADIO Ether Music Put on Trial . . . 15 Law Bars Radio Interference . . 53 Radio Photos by Air Jet. . . . 54 Device Aids Short Wave Radio. . 58 Tips to Help Get Sharp Tuning. . 68 Difficulties of Wiring Simplified. . 70 Use the Correct Voltage. . 70 Testing High Capacity Condensers. 70 ABC’s of Radio. . 0 el Power Unit Built at Low Cost . . 82 FICTION “The Make Must Go On” . The Movie Maker—Part Three. . 46 HOME WORKSHOP A Real Kiddies’ Playground. . . 79 Next We Make the Mayflower. . . 80 His Shop is Always Orderly. . . 84 How to Mount Small Motors. . 88 Radius-Forming Tool for Grinding Wheels . . 88 Marker and Combination Rule for Measuring Bar Stock . 88 Floor Compound Cleans Hands. . 88 Polishing Attachment for Speed Lathe. . 88 Window Shade Shields Lathe from Grinding Dust ._. oe. Making Your Jackknife Last. . . 92 Repairing Canvas Canoes. . . . 94 Restoring Old Furniture. . 97 Screw Eyes Serve as Neat Support for Shelves . . . 99 Furniture for Beginners to Make . 100 Blueprints for Your Home Work- shop . . 102 Template for Block Letter Signs . 106 Hot Bed Sash 110 Hydrochloric Acid in the Home Workshop. . ‘ . m Painting a Breakfast —— . 112 How to Fit Hinges Like an Expert . 116 How to Make Small Pulleys . . 120 FOR MECHANICS Jobbing Shop Short Cuts . . . 86 Thread Scraping Tool . 114 Steps to Take in nee § a Tool- makers’ Jack . . «ao Cork Pads for Clamps . 115 HOUSEHOLD KINKS Replacing a Broken Window Pane . 90 How to Cut Glass. . . 90 How to Fill Holes in Plaster Walls . 108 Cleaning Shades . ‘ . 110 Scrubbing Fireplaces . . 110 7 entry second-class : at Chicago, En as second-class mag Oh “at ithe Post Office Department, ‘snide Printed in U. 8. A. Copyrigh the Popular = science, P: of the Ange Se if A. riptions to United States, its possessions, an contents of this m senting 2 its editorial col: vid r con Monthly articles for stock: President and T R. C reasurer; must = be hy without permission. In umns numerous stories of new peotuste of applied lar a Monthly cng not underwrite the business met d Canada, $2 foreign countries, $3. us them. The use of poorer, Eolence es is never authorized. Capen, ao Vice-President: A. L. Cole. } A on ft j%@©o wre rr «oF

Page 9

L} — POPULAR SCIENCE MONTHLY Astronomy Eclipse Scheduled to Minute The "Mocs Makes Clocks Vary . Meteorite anaes wae Repair Car , Automobiles Toy Cars Teach Traffic Rules Know Your Car . ; Stile for Motor Cars Only : Old Motor Car Frames Make Break- water ; Simple Auto Bearing Test Loudspeaker Automobile A Leg-Operated Accelerator An Inside Motor Spotlight Decline of Railways Seen. Motor Super-Speedways to Cover Europe . . Rubber Paving Defies Wear Wooden Blocks as Jacks Two-Purpose Light Switch . Jack for Extra Light When the Axle Breaks Ten Dollars for an Idea! . Safety Beacons in Streets Aviation Largest Dirigible’s First Gas Bag Committee Surveys City in Plane to Pick Airport Site ‘ , Airplane Cowboys Herd Reindeer . Lighter Aluminum for Planes $400 Aero Fare to England . Odd Parachute Square in Form. Pilotless Plane Loops Loop Under the Control of Radio Plane Speedier with Pontoons Stunt Flyer Takes No Chances . Nondrifting Mail Parachute Engineering _ ii Runs nop a vad New I Bridge Inside Old One . Air Unearthing Buried City Biggest Shovel Lifts 24 Tons World Water Power Census Exceptional People Edison at Ford’s Show : — Stupendous Hand-Sewing He Takes Stalls to the Cows Woman Manufactures Stone 41 52 52 52 54 58 59 15 62 62 65 4 Health and Hygiene New Pulmotor Rival . . Expert Vindicates Coffee Vaccine Given in Pills Now . Laboratory Discoveries Seek Heat-Proof Walls Picked Fruit Keeps on Living : Study Blood with Radium Detector New Poisons Kill Pests Only X-Ray Imparts Luminescence . Chicken Heart Still Alive Models and Toys Just Like MacMillan Ship Children Devise New Planes Kiddy Car Has Plane Motion New Devices for the Home Closes Window by Clockwork €ylinder Jug Chills Beverages . New Mop-Wringing Pail _.. Pot Whistles When Eggs Are Done. Nonelectric Vacuum Cleaner Shows Who’s at the Door .. Pancake Griddle Is Also Waffle Iron Electric-Lighted Refrigerator Broils on Any Stove ._. ‘ Turns an Orange into a Drink . Cup-and-Sandwich Tray . Electric Plate Warmer Colander Comes Apart for Cleaning . Cooks Doughnuts at Table . New Processes and Inventions New870-PoundShell . . . “Magic Carpet”’ Aids Crops Mechanical Chemist Replaces Human Analyst . . : Rapid Gun-Sighting Device . Self-Winding Watch .. Complicated Bottle Machine Makes One Millionin Week . . . Rail Tickets Printed on Spot Steel Scaffolds Replace Wood Hiking Cane Has Tail-Light New Telephone Summons Imitates Bird’s Call . . Machine Tests Marcel Waves New Smoke Alarm .. Hand Bag Atomizer . . An Accident-Proof Baby’s Bottle 5 Mantel Clock Is a Savings Bank - 130 t 41 41 64 40 41 41 63 64 59 62 63 60 60 60 15 40 40 40 53 54 54 55 55 55 55 55 56 56 56 4 A Nonswaying Rope Ladder Fire Escape ‘ Tiniest S Sewing Kit. “Vulcanizing’’ Socks Saves Darning Lemon Juice Filters Pipe Smoke A Quick-Drying Shaving Brush . Now a Player-Accordion . Duplicating Typewriters Removable Lights. The Slot-Machine Manicurist Now . New Parcel Sealer. . . ; New Motorcycle Machine Gun . Multiple Locomotive Sirens. . Submarine Safety Device Is Donated tothe Navy .. Giant Rotary Plow. : Food Rises in “‘Magic”’ Table . Safety Device Stops Trains . Motor-Driven Wire Stripper Umbrella with a Window Simple Color Film Invention Unusual Facts and Ideas Social Brain Best . Much of World Unexplored — ‘ Brains Mean Death, Asserts Di. Carrel. Electric Power by Balloon . How Much Do You Know of the World You Live In? , How Cyclones Grow . . Jumbo of Roller Bearings Your Queries Answered Bird Flies Across Atlantic Before It Is3 Months Old .. ; Porcupines Don’t Shoot Quills yer Steel Balls Bombard —— Goggles . . ; Lindbergh Epic on : Post Card How Industry UsesSawdust .. A Needle Injects Sauce in Chicken . Rail Ticket Booth on Wheels. Discoveries Upset Race History Better Fur Cleaning Method Chemical Snow Replacing Ice . . Aero Engineers Aid Farmer hath In- proving His Windmills Mining Record Smashed. . Chain Drive Roller Skate Goes to *Patentees’ Court” vt ots Harem Buried with Ur’s King é Red Paint Draws Barnacles. . — Phonograph Heard ‘Thirty Smoke Dims City’ sSun. . Two Heads Proved to Beat One. Electric Yacht Run ed ee But- tons . 40 40 40 41 53 53 54 54 55 55 Keeping Abreast of the Times Interesting questions you now will be able to answer (p. 52) a PP PF “see by radio?” (p. 20) marine? (p. 33) Is coffee really harmful? (p. 41) service to Eng a eS UPS of pine trees? (p. $1) How did a famous cartoonist happen to invent an auto- matic boat-bailing device? (p. 34) Where is a new highway that runs through a skyscraper? What will it cost you to build a newly-demonstrated set to 15. What device has been invented to pass air, food, blankets 16. and heating — to the trapped crew of a sunken sub- Who is planning a regular trans-Atlantic air passenger aod, with a $400 fare? (p. 54) 19. How can uleitiine photograph atoms? (p. 42) Which of the world’s largest buildings stands upona forest 20. Are “two heads better than one?” (p. 64) 11. What aviator recently performed a spectacular feat in the (p. 27) mountain fastnesses of Quilali, Nicaragua? (p. 39) 12. world? (p. 19) Just what will it cost to own and run your own plane? What three-quarter-mile tunnel is the roomiest in the 13. Which American railroad has just installed the first auto- (p. 66) matic train-dispatching machine? (p. 37) 14. Why are sea-faring races of men pygmiest "ig 51) How can you “humor” delicate p 17. Do flies leave footprints? (p. 6 shove by radio? (p. 45 ts in transplanting? How much do mistakes of inexpert garage men cost you yearly? (p. 74) 7) 18. How high can the bucket of the world’s largest power swing? (p. 58) Why did only one = motor boat cross the finish line in a recent thrilling race? (p. 25) How does a Prospector hunt hidden ores of precious metals

Page 10

POPULAR SCIENCE MONTHLY May, WHAT IS NEW THIS MONTH Table of Contents for May LEADING ARTICLES Dick Byrp—ADVENTURER . . By Fitzhugh Green The romantic story of one of America’s greatest airmen Wauiuzzine at A Hunprep Yarps a Seconp! . By Carl Helm A 207-mile-an-hour dash that shattered a world’s record New Wizarpry or CoMPRESSED AIR By Robert E. Martin How leashed whirlwinds serve you in daily life To Detiver Music sy WIRE . By Edwin Ketchum Radio programs over your electric light lines in latest amazing plan Riskinc DeaTH FoR SCIENCE. By Earl Chapin May Why daring inv stigators experiment on themselves A Sup Tua? Can Ficut a SQuapRon By Herbert Paus An artist’s impression of the airplane carrier Saratoga Youne America Finns rts Wines By Edgar C. Wheeler Creating a new race of aviation engineers Vite Smetts Maps INTO PERFUMES By P. A. Carmichael The amazing origin of scents that charm Tue Winn’s Wuairuicic or DEATH . .. . By L. G. Pope Our newest knowledge of the havoc-spreading tornado New Wortp Arr Trams Buazep . ; .By Hyatt E. Gibson The thrilling story of two epochal air jaunts Gives 42 Quarts or BLoop To Save 86 Lives By George Lee Dowd, Jr. Cheating death with modern marvel of transfusion WueEn Icresoxes Breep Germs . . By Frederic Damrau, M.D. Dangers of an inefficient refrigerator P=zzzters Meet tn War oF Wits . By Alden P. Armagnac Behind the scenes with the makers of brain-teasers Pitratits THat Await INVENTORS By Bruce Donald What to do with your patent Artic InvENToR’s Macic Eye Sees Across THE OcEAN By H. C. Davis " How a penniless pioneer achieved television SECRETS OF AL TALK REVEALED . By Warren MacDougall Cars Our Reapers CHOooseE . By Martin Bunn Helpful pointers for prospective buyers i in Popular Science auto contest So.vine THE Mystery OF THE SHAPE OF THE EarTH Pr ee ee By Edna Kenton If our planet is not a globe, then what? A Wuote Farm in Your Yarp . By E. Bade How to plan your summer garden He Buitr a Home in Opp Time . . By John R. McMahon An amateur-built dwelling that was finished in six months AviaTION SLANG . By Brock Mays Interesting gleanings from the airman’s parlance Our Reapers Say. . . ee a FICTION Tue EtectricPmuort . . . .By Beryl D. and Orville H. Kneen A breath-taking episode in the life of a stunt-flyer Tue Movie Maker—Part Four . By S. W. Newmeyer Secrets of the film world in a thrilling novel RADIO Maxine Your Rapto Speak Up By Alfred P. Lane Amazine New Ampuiryine TuBE By John Carr THE HOME WORKSHOP ParntinG witH Hanp SPRAYERS . ‘ By Berton Elliot Our Mayflower Taxes SHAPE By E. Armitage McCann Maxine THE Most or A LATHE . By Albert M. Thomas 13 16 19 21 25 27 30 31 33 34 35 38 39 41 45 46 50 56 69 72 10 22 42 66 68 77 78 84 T Automobiles New Auto Engine toSaveGas . . 48 Motor Car That Can Swim Devised to Explore Alaska . . . 49 Know YourCar . . » « = Interchangeable Truck Motor . . 62 Mirror Keeps Traffic Lights in View. 74 A Locked Tool ee . « Handy Spouted Can. . . « & Light Shows Brake Position. . . 74 Ten DollarsforanIdea!. . . . 74 Astronomy Largest American-Made Telescope Mirror Cast . . .« 2 Solving Secret of Glow in ‘Sky ‘ “0a Boy Builds Own Telescope . . . 55 Aviation Flight in Aged Plane Shows Aero gress 18 Railroad Yards to be Airports Too. 37 Planes and Gas Fight Locusts . . 52 He Flies 18,000 Milesa Month. . 54 Planes Sink Ship in Test. . 58 Now You Can Insure Home Against Wreckage by Airplanes . . . 59 Flyer ate Se Loop 1,111 Times . . 59 Speaking Tubes By Aviators . . 60 Did Balloon Clock Cost Life? . . 62 Engineering S-4 “tae Project Uses —— van toon . — 18 Artificial SeaforSahara. . . . 48 High Bridge Engineering Feat .. . 58 Exceptional People Three Science Medals Won. . . 49 Makes Tricks for Stage Musicians . 57 Designing wel Is — Unique Job. . on 2 ee ieltiaidiai Prehistoric Animal Bones Unearthed in South America . . 49 South Sea Expedition. . . . . 59 Health and ee Gains in War on Disease. . . 49 Hair Grows by Spurts . . . . 53 Laboratory Discoveries Ultra-Violet Glass on Trial . . . 48 New Power of X-Rays Found . . 52 Unique Nonmagnetic Ship Seeks More Secrets of Sea 53 Radio Tube Used Backwards Aids 4 Study of High Voltage. s ay. 260 Fourth Vol. 12. No. 5. Popular Science Monthty is published month- venue, New York, as Y., by te ‘opular Science Publishing Canada. ia Printed aU. 8. A. Copyright, 1927, by the Boone Publishing Co., Inc. Single copy, 25 cents. Yearly "quaautipiiete te to as second-class ma’ ter Deo. 28 1918, at yh Post Office at —_—> its editor Ney ‘York under the act of March 3, 1879 additional ‘entry as second-class ee, Popular Sci matter at Chicago, En’ matter “at “the rows Ones of the viduals o United States, its possessions contents ¢ of this Monthly articles for stock: President and Treasurer; R. and Canada, $ foreign countries, $3. The eegacine must not be co hoe without permission. In pre; lumns numerous stories of new products of ap vay - Monthly does not underwrite the business methods r concerns yn them. The use of Soowee Science emes is never authorized. apen, Fn Vice-President; A. L. Cole, } Ae May, 1928 ait Ol eet lt OlCUDlS

Page 11

POPULAR SCIENCE MONTHLY Models. ¥ Vise Attachment Holds Tubes Firm. 60 * Four Centuries of Bicycle History . 58 Typewriter Shifts Carriages . 61 Weather on Air Six Timesa Day . 59 Tiny Earth, Sun and Moon oping Device to Stop Gas Poisoning 61 Pupils Make Musical Instruments . 59 Pace with Real Ones .. Tides Operate Electric Buoy 61 “Synthetic Grain” Proposed. . . 59 Yachts of Paper .. 57 | Bank Vault Oxygen Tank 61 Clock Set in Floor of Bank . . 61 Mayflower Ship Model 78 | Umbrella Pocket in Bag. . 61 | Hard Slate Cut Like Cheese by Cable Airplane Model for Racing 82 | Target Records Your Score . 61 Filled with Sand. . 62 Models Made from Our A 108 | Rigid Hack Saw Saves Blades . . 61 | Air Tubes Carry Red- Hot Steel. . 62 Building Bricks Made of Waste from Unbreakable Concrete Poles. . . 63 ° Big Baking Powder Plant . 63 | New Products of Corn Waste . . 63 New Devices f or the Home ae on —_— Phone Cal Re : 63 ~ _ +7 Tae Spee of the Nonclogging Salt Shaker ; 64 achine Lakes Phone Ca peats or ouLive In? . . 63 Turn of Wrist Adds Salt and Pepper. 64 It on Your Return. 63 “Tceless” Ice Balls Chill Drinks . 64 Ironing Board Hammock 64 For the Home Owner Guards Your Milk Bottle 64 Photo gra phy Makes Coffee under Pressure 64 Double-Duty Screen Door . . . 88 Flat-Lid Teakettle of Many Uses 64 | As Many Photos As You Wish . 59 | Hints on Puttying and Painting. . 98 Floor Scraper Broom Attachment . 64 | Camera Built into Hand Bag 60. | Repairing Wall Fabrics . . . . 98 Odd Fork Mixes Food 65 Filling Floor Cracks .. oa Deep-Dish Pie Cup . 65 How to Repair Chipped Fixtures . 100 Speedy New Toaster. . 65 Radi Magnetic Tack Hammer... 100 — Cooker Lies Flat, Stands on adio End . 65 “One-Way Window” 1 Tells You Who bay tha no \ Rete tems Two is | Hints for the Mechanic s Outside ‘ 65 ; . Novel Suction Hanger ‘ 65 — — Made Still Purer . 49 Taper Boring Attachment for a Lazy Tong Window Washer . 65 | w, of th U sed i Uni — by Twe Lathe . . . 86 New Oven Scoop. .. . 65 Bis I net Stati a _ 53 | HackSaw Pad. 86 1B ” es : Holder for “Sizing” Packing Rings. 86 Seat for Use on Derrick . . 86 New Processes and U LE d Ide bias arty — . Lathe Dog . 86 : 0 ade Milling Attachment . 104 Inventions ARES. SEED ane Jig for Drilling Oil Holes . . . 104 The Mechanical Man Shown by His Pontoons of 60-Hour Atlantic Speed- : Maker . 18 boat 18 . Device Reveals Voice’s Struggles Relics 3,000 Years Old Dug Up Near Ideas for the Handy Man with Foreign Languages .. 49 Berlin , ; 18 Compact New Seismograph Records Ants Have Fire Department. 48 | Two Cabinets that Hold All a Boy’s Earthquakes. 49 | Sunken Island Is Grumbling. 49 Treasures 79 Telephoning through the Sea 52 | Millions of Pounds of Air Blown A Movable Saw Table Wheeled on Automatic Typewriter Cover 52 Every Day in Organs . 52 Casters ; Peat Flowerpot Stand Aids Plants 52 | Hibernation Next to Death . 52 | Wood Turning for Beginners 3 3 Blackboard Drawing Device 52 | Air Fans Quiet Din in Tunnel 52 | Refinishing a Canvas Canoe 90 Mechanical Tennis Opponent 53 | Highways to Link Americas . 53 | Novel Pipe Rack Has Japanese Lines 95 Golf Tee and Pencil in One . 53 | What Do You Want to Know? . . 53 | How to Make Sticking Drawers Run Microscope in Pen Barrel. 53 | Millions of Gallons of Gas Saved ” Smoothly. 95 New Clock Run and Regulated from Light Tank Paint .. ‘ 54 | How to Make White Library Paste 97 Wall Socket . . 54 | Ship Fights Storm with Syrup . . 54 | Blueprints for Your Home Workshop 101 Coal Oil Distilled by New Process . 55 | Electric Alarms for Sleepy Students. 55 | Home Workshop Chemistry. . . 103 Machine Buries Power Wires. 59 | Nothing at All—a Vacuum—Worth Anvil Makes a Novel Paper Weight 104 New Edison Miners’ Lamp 60 Millions to the World ._. 55 | A Useful Trick for Pressing Men’s Wheelbarrow with Caterpillar Tread Tiniest Plant Makes 12 World’s Best Ties . . 108 Will Not Cut Ground. . 60 Accordions a Year . 57 | A Simple Way to Prepare Colored New Hat Rack Saves Space . 60 | Stout Hickory Rods and 24-Thread Marbled Paper. . +, as Bag Keeps — Clubs om Cutting Lines Catch Swordfish . ; 57 | Improvin ng a Paint Sprayer i ae Green. 60 4 1,309,918 Bulbs in Signs . 58 4 Driftwood Novelties of Cypress. . 118 Keeping Abreast of the Times Interesting questions you now will be able to answer — . out on a large scale? (p. 21) What single ship can defy a whole battle fleet? (p. 27) 11. 2. In what great city is “wired radio”’ to have its first try- Why were experts ove apres when they broke open the mold containing the in America? (p. 48) argest telescope mirror ever cast 10. a Why did Costes and Lebrix, round-the-world French flyers, really undertake their amazing trip? (p. 33) What poor young inventor made biscuit tins and soap boxes into a home television set? (p. 41) What bird can “talk’’ with an alphabet of twenty-four letters? (p. 45) Who piloted a record-shattering racing auto built on air- plane lines? (p. 16) What prominent official advocates roofing railroad tracks for airports? (p. 37) Why must certain dangerous medical experiments be tried on human beings instead of animals? (p. 25) What is the national group whose members call one another by such odd, fanciful names as “Skylight” and “‘Zoroaster’’? (p. 38) How fast is a tornado believed to whirl? (p. 32) 12. 13. 14. 15. 16. 17. 18. 19. 20. What important precautions should you take in selling a patent? (p. 39) What is the latest method of performing a blood trans- fusion? (p. 34) What is meant, in aviation slang, by a “kiwi” a “‘ wash- out’’? (p. 72) What famous aviator and explorer was a football star in his youth? (p. 15) — now believe that the earth is really a sphere? p. 50 How can vou make one flower garden yield two crops of blooms? (p. 56) What insects have fire departments? (p. 48) “ na correct way to spray a table with lacquer? p. 77 How does a new electric clock bring you observatory time? (p. 54) |

Page 12

POPULAR SCIENCE MONTHLY

WHAT IS NEW THIS MONTH GEER

Table of Contents for June

LEADING ARTICLES BREAKING INTO AVIATION . .. By Edgar C. Wheeler Famous pilots tell how to become a commercial flyer First PLANE From Europe By H. C. Davis Rapro Brines Pourtics into Your Home| By Earl Reeves Broadcasting and the Presidential campaign Purtine THE EartH ON THE SCALES . By Edwin Ketchum How a physicist in a cave is weighing the globe you stand on A Great Dream Opens AN EMPIRE . By Homer Dye, Jr. The romantic story of David Moffat and his tunnel y bese the Rockies Seventeen-Year Locusts Coming. . By A. B. Champlain Odd facts about the queer insect horde that will vint us this summer Dick Byrp—ApvENTURER—Part Two By Fitzhugh Green An untold chapter in the thrilling life story of a popular hero Huge Friyine Horets Race ror First Overseas Fiicat By Carl Helm ‘A glimpse of luxurious ocean voyages in giant new dirigibles Huce New Surer-Locomorives . By George Lee Dowd, Jr. Novel designs and queer fuels of modern engines Catcuine Crooks witH A CAMERA . By Howard McLellan How the all-seeing lens detects forgeries and convicts evil-doers Gauiteo GaLIiLet, “ImmortTaL Foou” . . By Arthur A. Stuart Why a persecuted genius is now called the father of 6 science TAMING THE MissIssIPPI. . By Myron M. Stearns A great problem of flood control discussed by an expert Forts ON Teams Dery Banpits By P. A. Carmichael How armored cars transport valuables in safety Giant Mystery Tuse Promises New Rapio Marve.s By Robert E. Martin ‘A wireless thunderbolt that kills animals and Ee plumes of fire $200,000,000 ron Researcno; WHat Do We Ger? . | By Frank Parker Stockbridge What science’s ‘triumphs mean to you in your daily life House Srarts Lire Over AGAIN By John R. McMahon Turning an historic home into a modern one Way Most Home Rerricerators ARE REALLY WorTHLESS By Frederic Damrau, M. D. Startling pages from the Popular Science Tostitute s tests Gus Expuains a Broken AXLE . By Martin Bunn Why your car can turn a corner Treat Your Puants Like Bases. . By E. Bade “Bringing up” the summer flowers and vegetables FICTION Hovupin1 or THE DeEsERT. By Fred Graves The vivid story of a man who faced savage elephants i in Ktrican wilds Tue Movie Maxer—Part Five . By S. W. Newmeyer -A dramatic novel of the cinema RADIO How to Apapr Your Set To A.C. By Alfred P. Lane THE HOME WORKSHOP A Seaptane Mope. Tuat Files By J. Danner Bunch and Avison F. Koch Smmpte Workpencu Kinks . Hints on Usine Portasie Toots By ‘H. L. Wheeler 13 16 22 24 25 27 28 32 35 36 38 40 42 43 51 67 69 70 74 18 48 64 77 78

Astronomy Watching a Star Explode . . . 46 Astronomy’s Silver Ball ._. 55 Temperature of Mars Taken; Fifty Above at the Equator. . . 58 Automobiles A Seagoing Auto . —— Auto Horn Sets Traffic Light , Emergency Hose Repair. . . . 72 Spring as Fan Belt ‘ ~ « ae Round the Spring Edges . . . 72 Ten Dollars foranIdea!. . . . 72 Aviation Wright Airplane Shown in London. 21 Lindbergh Designs a New Plane . 21 Airmen Again Fight Arctic . . . 34 Britain’s New Airplane Carrier. . 52 Nations Share Air Triumphs . . 52 New Air Surveying Exploits . . 52 Planes Rise Like Rockets . . . 52 Radio Laboratory in Plane .. 52 Plane of 150-Foot Spread Has Wheels Bigger Than Man... 53 Balloon Dwarfs All Others . . . 53 U. S. Retains Altitude Mark . . 53 New “Gear-Shift” Propeller. . . 53 Hospital Ward on Wings. . & Fighting Brood of the Lexington . 68 Planes Aid Wrecked Ships . . . 54 Metal “Ears” Detect Planes . . 55 Seven-Cylinder Plane Motor . . 56 Air Mail Signal . . 57 Novel Cockpit on Ground Tests Flyers’ Ability .. ae 59 New | Radio Talks to Flyers ie oie rr agate First Welded Bridge . . . 46 Novel Test for Steel Bridge . i « Huge Concrete Wall Moved . . 58 Health and Hygiene Human Treadmill Tests a s ungs ‘ 46 Medicine’s Great Advances . 47 New Vitamin Discovered in Experi ments on Rats . F 47 Peril in Some Public Baths . . . 54 Brain Surgery EffectsCure . . . 58 Laboratory Discoveries Edison on Job Testing Rubber . . 21 Nerve Impulses Heard in Tests . 46 Lightning Bolt Put to Work . . 47 Radium Substitute Promised . . 58

Vol. 112, No.6. Popular Science Monthly is published month- yop PRAGA by the Po; Pu Inc. Entered as second-class matter Dec. 28, 1918, at the Post Office at “York under the act of March 3. 1879: additional ‘entry as second-class tL - 3 Illinois. ares ag second-class matter at the Post Ones 4 Copyrigh' e Popular Publishing Cc Co., Inc. Single copy, 25 cents. Yearly ‘subscriptions to of the individuals o Monthly articles for stock President and Treasurer; R. senting in its editorial columns United States, its possessions, and Canada, $2.50; foreign countries, $3. The contents of this magazine must not be reprinted without permission. In numerous stories of new peeGuste of ap ied science, Popular Science Monthly does not underwrite the business methods or coneerns “a4 them. Th es is never

~— a —— -_—_——

ie use of ryouee Science authorized. O. B. Capen, P ion Vice-President: A. L. Cole, Secretary, ' |

Page 13

U June, 1928 POPULAR SCIENCE MONTHLY eel ” Models 3 —_ _ of owen .~ Auto _ 58 ¢ = en Set Det ‘ Lo 60 rain Transplanting Device In- ow an Mine ‘ 60 Strings Cotes a oon Auto. . . = creases Crop Five Times . 60 | How Much Do You Know of the Rigune t™ ? Poy Ty boat | 8g | Life Rafts Made of Kapok: . 61 World You Live In? . 60 Rubber-Driven Toy Tugboat . . Theater Seats of Rubber 61 Biggest | ew oy nLiner 61 ‘ onora otor Bus ins é 61 New Devices for the Home Photography Sounds Have Their Colors, Says Rolling Marble in Wall Holder . . 62 | Living Bacteria Filmed by Micro- Psychology Professor . . 61 Kettle Flates Save Burning, Clean Movie Camera... 47 For the Home Pistia Silver. 62 | New Four-Lens Camera for Aerial : yy Cabinet Has Bins with Survey . 52 How to Paint a Breakfast Set . 82 . 62 | Folding Screen for Home “Movies . &7 Tuckaway’’ Servesas Table . . 98 Bel tray ‘Holds Food or Book . . 62 Scientists Risk Death to Film’ Vol- Colorful Craft-Work Novelties . _. 100 Glass Holder for Bridge Table . . 62 cate ja Action 59 | Simple Folding Cot for Emetgencies 106 A panatnn Lock for Your Front Neat Trellis Supports Porch Flower Door . — 62 Radio Box . . 106 Cork Bath Brush Floats. . . 62 i How to Fit Drawer Locks Expertly 106 Sanitary Rubber Milk Bottle Stopper 62 a i en pai Repairing Loose Chair Rungs . . 118 elping the Deaf Hear io . a Sat _ based — 62 Radio Aids j in Paper came) 60 Hints f or the Mechanic Hairbrush, Mirror, Comb in One . 63 | How to Use Solder 66 | Small Planer Does Heavy Work . 86 An Electric Plug You Can’t Break . 63 | Repairing Radio Parts 66 | Worn-Out Milling Cutter Used for Moistens Your Home’s Air . . . 63 | Special Tools Save Time 66 Light Shaping . ; 86 Novel Lock for Lamp Bulbs . . 63 | 4B C’sof Radio . . 66 | Spring Improves Old Grinder . . 86 Oven Shelves Slide Out... 63 How to Stamp Index Arrows .. 103 Metal Sponge ee Pots and Pans 63 Unusual Facts and Stans Fitting Keys Quickly . . . . 108 Strainer in Jug’s Lid - « 63 | The Doomed S-4 Raised . 21 Couch Hides Clothes Racks: . : 63 | Breaking ect Toll 91 | Ideas for the Handy Man i Ship Swallows Whole Trains . $1 | Surf Sleds and Boards Easy to Make 79 : New Processes and Magnets—Strangest Tool of Man . 39 | Concave and Convex Turning . . 90 : In ti Grows Plants without Soil 47 | Channel Sills Make Strong I-Beams 93 ventions Electricity’s Strange Uses. 54 | Book Ends Embellished with Inlaid Pulverized Coal Runsa Ship . . 45 | Alaska, America’s Bargain, Yields Designs : 95 Turns Cornstalk into Paper Pulp . 46 Over a Billion Profit. . 54 | Our Boy Rides the Air Mail 96 Makes Hydrogen Cheaper and Safer 47 | Street Car Camp for Tourists. 54 | Dish-Mop Buffing Wheel . . 98 Self-Acting Crossing Gate . . 54 | Plants Growing in Tree Tops Extend Jumping Jack Has Clothespin Body 98 Pillow Cures Sleeplessness . . . 54 Roots toGround .. . 55 | Blueprints for Your Home Work- Lost Sheen of Silk Restored. . . 54 | First World Weather Maps . 55 Shop . as 99 The “Iron Cashier” . . .. . . 56 | Helping Nature Color Fruit . 55 | Tools for Metal Workin . . 104 New Sealing Tool . . . . . 56 | All Boys in 4 Generations 58 | Stepping the Mast of a . . 0 Pocket Kindling Wood . . 56 | Tree Rings Reveal History . 58 | Books That Tell How to Do Wood- Workbench Tool for Many Tasks . 56 | A Subway without Trainmen 59 working . . 116 Lawn Mower Carries a Light . . 56 | Old Paper Money Made Over 59 | Glycerin in the ‘tue ‘Workshop 117 Cigarette Lights without Match . 57 | Any Questions? P . 59 | Paper Strip Indicates Moisture in the Overshoes That Fit in Pocket . . 57 | Blue Paint Joke on Baboons. .60 Air 118 Automatic Lighthouse Can’t Fail . 57 | Transplanting Hawaii's Fish 60 | Homemade Vise Has Guide Bars This Boat Rolls on Water . . . 57 § Smallest Fire Boats Fastest . 60 ¢ Madeof Pipes... . 119 WHAT IS COMING NEXT MONTH q ‘How do trans-Atlantic flyers know when to hop off? They don’t. But the weather man does. And the meteorologist who started Lind- bergh, Byrd, and Chamberlin will tell in our next issue just what is the “right weather” for ocean flying. qj “T can peer into your stomach and read your future!’’ a famous physician recently told the editor of this magazine. And this doctor has written a remarkable article that tells how marvels of X-rays are solving mysteries of the human body. q You can almost hear the spectators’ shouts as the man who knows most about the world’s greatest sporting event—the Olympic Games—predicts in a vigorous article the results of this summer’s meet. Africa has a lure like that of no other con- tinent. Strange people, strange animals, strange plants, and strange customs! ‘Now I'll Tell One About Africa” is an article that you won’t want to miss. q “R.O.G.” to anybody interested in aviation means—“‘rise off the ground.” So an R.O.G. model is one that takes-off like a real plane. A simple model of this type will be described in our Home Workshop Department. q You will want to read, too, the next chapter of Commander Green’s biography of that modest hero and sportsman, Richard E. Byrd, and the second installment of “Breaking into Aviation”’—thrilling first-hand experiences of famous pilots. AND leading articles that will tell the latest, up-to-the-minute news of laboratory discoveries, scientific triumphs, and amazing new inventions