Popular Science Monthly 1929: Vol 114 Table of Contents
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JUN 17 1923 POPULAR SCIENCE MONTHLY Aoix@ Table of Contents Volume 114 JANUARY TO JUNE 1929
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POPULAR SCIENCE MONTHLY JANUARY, 1999 rae . Table of Contents for January | | LEADING ARTICLES ’ Automobiles | Tue Reat Fatuers or Fiicut. . By John R. McMahon 17 Know Your Car _ . ; 57 The inside story of Orville and Wilbur Wright, told for the first time 6 by ~— Roads : 66 ; Har A Brion New Srars! . ; .By Edwin W. Teale 20 an be Park the Cor Sideway it a | How the world’s greatest telescope will enlarge our universe Meter Baal fe Mads tees Teed Snoors His Racine Car at A TARGET . By Marcel Wallenstein 22 end Water . 68 | The story of Major Segrave’s new four-mile-a-minute racer Oil Cup Invented to "Stop Battery A Five-Mituion-Voit Gun Burtt To SmMasH Atoms Corrosion. 68 By Alden P. Armagnac 23 Dashboard Register Keeps Oil Mile- Daring adventures with the greatest thunderbolt ever harnessed age Record . . 68 Tue Tauest By Frrreen Srories . 25 — Pliers Serve as Handy Valve Engineering wonders planned for the world’s largest sky: scraper Pe nee Checked ee, -_ ArMoRED Suips Win TuriILuinG BatTLes with Powar Ice 4 ee ge om By Robert E. Martin 26 ~~ — Glare “Specs” for y fo . Night Drivers 69 Adventures of men who risk death to smash the frozen barriers Conon Clicks as Racing Car Climbs Waar THE Wor.tp Owes To 1928_—izr. . 8 Fence. . : 71 Leaders in many fields of science tell of the year’ s great ‘achievements Novel Bushing Press. 86 Most We Aut Wear GuassEs? . .By E. E. Free 30 eo Serves as Trouble - Surprising new facts about our failing ey udebe Sn — Oe ae re A Ficutine SKIPPER OF THE AIR . . By Arthur A. Stuart 32 A Three-Tone Horn . ; 86 Looking ahead with Dr. Eckener, builder and master of air liners Fea Belt Repair Q 86 How To Spot THE AIRPLANES. . . 34 Ten Dollars for an Idea! . 86 modern makes of commercial and military aircraft i Lost Races Live Acarn! . . By Michel Mok 42 Aviation Romantic adventures of the Sherlock Holmes’s of archeology ' Pep | Famous Macic Tricks ExputaIneD. . . By George S. Greene 45 — 308 A oo a? = Secrets of startling stage illusions revealed for the first time The “ Whirlyind’s” Dad dy? 40 Neon, Maaic Gas THat Licuts THE Way TurouGH Foa To Guide Byrd Flyers. 40 ; ; : By H.C. Davis 47 Map Guides Air-Mail Clerks 40 New uses for the intense new light that shines out day or night Testing Effects of High Altitude 40 SrrRANGE Fires THAT START THEMSELVES By John E. Lodge 50 Safety Valve for Super-Dirigible 41 Strange stories of queer blazes and how they started ag to — = — ; - One Man Coutp Run Tuts Sure! . .. .. a 53 oe ° . Marvels of the newest electric ocean liner Will Market Autogiros 41 Warns of Flying Ailments 41 Water or Air Cooling? 41 SPECIAL FEATURES Rone Remaeiang Bevtee 41 ables to Guide Planes 41 Cover Desien . : . By Herbert Paus Dispel Fog by Heat . . 41 | How To PERPETUATE Your Eannina Power . .By Wallace Ames 4 a Airway Beacon Weighs Nearly a as The financial editor’s monthly advice , ae 57 Putuine THE Macic Heat Switcu ._ . By Collins P. Bliss, M. A. 12 Parachutes Have Snatched 115 Why home owners turn to oil burners for convenience and comfort Flyers from Death. . ‘ 66 Our Reapers Say— , 14 Plane Terrifies Pygmies . 71 Links IN THE CHAIN oF SCIENCE. . By Karl V ooght 48 Wreckage Tells of Amundsen Fate . 72 Interesting facts and comment gleaned from the news of progress ‘ Your First TELEvision Set. . .By John Carr 65 Engineering How to build and operate an ‘experimental receiver Sertine Up a Monet Raitway . By Frederick D. Ryder, Jr. 16 Huge Bride “ » eels ” semmeenes 56 An expert’s hints on one of the most fascinating of hobbies Fresh Air a Mile Down 56 Wuen Anp How To Appty Katsomine. . By F. N. Vanderwalker 78 Air Pressure Gun Shoots Cement Making over old walls and ceilings 135 Feet. . 56 You Can Make Artistic Hinces . . « By Edwin Thatcher 79 Record Blast Dislodges 40,000 Tons Simple ways to construct hardware, told by a master craftsman of cory Went Gece D 58 How To Burtp a Rea Frrepiace By Basil Ewing Webb 80 ~—— ell Goes Down 7,800 e Modern tricks that revive a “lost art Bas irene, ties ngthen New EDITORIALS . . 82 Coolidge Dam x - 66 How You Can Test ANTIFREEZE , By y / Me ortin B unn 84 Upside-Down Skyscrapers Proposed Gus and Joe reveal a simple formula that will save worry and money 4 in Japan . 72 Geer UE Ls LNs, 2, emtag erate net nets Dae ten te poets, sot Cael, ei omc, 7 - Co., Inc. Entered as second-class matter ‘Dev. . 1918, at the Post Office at senting in its editorial columns numerous stories of new products of applied ‘° | New York under the act of March 3, 1879; additional entry as second-class opeses, Sous ar yy ——— does not underwrite the business methods -*hd = matter c S Cutenee. Illinois. Entered as second-class matter at the Post Office of the individuals o ucing them. The use of ey" Setenee Canada. Printed in U. 8S. A. Copyright, 1928, by the Popular Monthly articles for stock-8e schemes is never authorized. O. B. Capen, Science mublishing Co., Inc. Single copy, 25 cents. Yearly subscriptions to President and Treasurer; R. om ilson, Vice-President; A. L. Cole. Secretary.
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u u WTA RY, 1929 Janvany, 1929 POPULAR SCIENCE MONTHLY 3 —— Exceptional People t New Processes and ? Mee dene “ee! Tanks Built Champion Blood Donor Has Given Inventions Giant Pump Is Lubricated with 117 Pints. . 54 Water It Lifts .. 59 —— He Agrees to Kill Five Million Paper Defeats the Check Millions of Tons of War Explosives Prairie Dogs 71 orger . we ew 52] Put to Use . 59 Champion ist Knows Two A Pencil and Handy Slide Rule Modern Machines Develop Rich Hundred Tongues 71 Combined . 54 Diamond Field . ; 59 Keeps Hundreds ds of Antique Clocks Now Golfers Can Tee Off in the Begin Search for Radium. . . . 59 ——— Ticking on Time . . 72 Living Room! . 54 | Coconuts May Rival Cows .. 60 Oe aes | Simplified by Screw- os baw Lumber Reveal a Paint we aus. . . 61 Health and Hygiene Hand-Driven B Buffer Wheel Polishes 55 | 2oy, Sails 1, 750 Miles. . 61 57 Yellow and Red Rays Also Vital to It Plays a Tune When You Light a m aot cat — nada That Won't 61 s Body Growth aad Cigarette 57 | Largest Grindstone Is Built in Z a Meals Not Harmful, i Pocket Microscope * Sesten ithe or 66 * ests a . 58 hs, - ees Nerves, Experi- - a’ “Cart before =e Tries Mechanical | Stamp e ees eel 7 wee SN the Horse” . 59 | Phone Net Widens . . May Save Lives of Carbon Monoxide « Sandpapering Made Easier by Handy Buttons, Conbe and Pens from 38 68 Victims . ‘ 7 Holder ee . 69 Skim Milk . 67 ae atrolman’s Club Also Flashlight 60 | Twelve-Foot Pie Hauled to Oven by ” Laboratory Discoveries This Mail Box Sheds the Water Like eq tractors 67 69 Plants, Like People, Tanned by In- Handy Shaving Lamp Moves Around "Mae. gy Tug alien — 67 69 visible Rays 58 the Mirror . 66 | The World’ s Longest Railroad . . 68 Predicts Water in Place of Coal for New Tool Invented to Cut Curves New Highways for Brazil. . . . 68 69 Fuel . , 60 in Wood . 67 | Huge Tree from Tiny Seed . 69 Life’s Riddle Is Nearly Solved, Says Stainless Steel "Propellers Save Re- The Birds Set Records in Trans- 71 Chemist . 71 | | pairs . OPES Se Atlantic Flight .. 70 a 9 ny al Rowboat Offers Novel 7 | 084 yDuck””'S Suit Permits Walking - SI ee in Water 70 a. Metering Speedy * Footmobile Folds and Record Overland Vision Nearly 200 86 How Much Do You Know about the Parks in Closet . oe eae Miles. 71 86 Weather? 56 | Airplane Pioneer Builds Novel Lighted House Numbers Law in 36 Philippines Will Witness Sun’s Total Motorcycle . - ee w FB Stockholm . . 72 : Eclipse. 56 Electricity Fights Pests; Electro- Timing Wind Speed a Hard Job for cutes Rats . 72 Weatherman. . 57 Photography Searchlight Battery a War Game ; Hailstones Larger than Baseballs Spectacle. . 72 40 ] on Record . 58 | Silver Nuggets Salvaged from Movie Rum Runner, Set Ablaze, Tests Fire 40 Tower Thermometer the World’s Films. 60 wees v's 73 40 Largest . 58 | Camera Records Path of Lightning 40 Simple Ways to Measure the Speed Bolt . 61 40 of the Wind . 60 | Living Human Cells “ Act” on Movie For the Home Owner 40 — Builders Aided by Weather- Scree: ‘ 67 41 66 Altitude Told by Camera. 69 | Furniture Polishing Secrets . 106 41 Proposes “Smoke Rings” to Prevent X-Ray Movies Reveal wearer ofa Oil Burner Improved with Baffle 41 Hurricanes . 68 Rose. . 73 Plates .. . 107 41 Replacing a Broken Window Pane . 114 4 Models Radio Novel Indoor Clothes Drier . . 116 A “Wonderland” of Model Ma- ‘ . 3 chinery 52 | Invents New Television System Hints for the Mechanic 41 Elaborate Model Railway Uses Tacks Minus Disks. . . wh. for Spikes. 55 | ABC’sof Radio. . ‘ 64 | Mounting Your Lathe Work . . 9 57 Working Model Train Fits in Ciga- How to Kill Dynamic “Hum” . 64 | Handy Tool Bit Holder. . . 94 rette Case. . 56 | More Durable Tubes . ; 64 | Improvised Fixture for Broeching . 94 66 Remarkable Model Shows " Apart- Better Volume Control ; 64 | Old BillSays— . ere ak 71 ment Village. . . . 67 | Radio Piano Invented to Hush A Spring Winding Tool . . 108 72 How to Build a River "Packet 90 Twanging Sound 70 | Holding Flat Form Tools . . . 108 — — | Spindle Hole anf ° the Chuc New Devices for the Home | [7 6yal Facts and Ideas Quick-Change Punch and Die Holder 108 Stove Rings Save Heat . . 74 Tool to Aid in Cleaning Machine 56 Ice Cream Made with Your Washing Hourglass, Germ Screen Added to Fixtures . woes. 56 Machine. . 2 74 Telephone . 54 | Quick Way to Space Holes . . 110 md Curtains Tethered ‘ rs 74 ~—* Suddenly Vanishes for Three ooked Iron Plug Saves Fingers an es 54 oS Connections . 74 | Curious * ‘Rubber Snake” Is Found I deas for the H andy Man 58 One Handle Lifts Many Saucepans . 4 in Yellowstone . . 54 New Cap-Removing Wrench . . 74 | Rat-Eating Rats Bred to War on Setting Up a Bench Saw Table . 88 31 “Nutcracker” Tongs Lift Pans . 74 Their Kind . 54 | It’s Easy to BuildanIgloo . . . 96 Two Electric Stoves in One. . 74 | Complete Fire Department on a Cabinet—1929 Model 98 56 Portable Two-Piece Baby Crib . 74 Two-Ton Truck. 55 — for Your Home Work- Gombination Tea-Coffee Percolator. 75 | Million Mark Passed by Five U.S. 105 72 Window Panes Fold in for Cleaning. 75 Cities. . 55 Caustic Soda Found an Aid in Gluing Soap Chamber in Dishwashing Mop 75 = Had Tooth Ills 3,500 Years Several Woods. . . . . . 112 Safety Latch Locks Gas Cocks . . 75 55 | Quick Drying Putty . .. 116 Funnel and Strainer in One . 75 Te ehone Calls Triple in European Improving Gas Range Lighter 116 Screen Is Kitchen Cabinet 75 Cities. . 55 | How to Turn Large Columns 122 me Rubber-Lined Caps Save Ginger California Fishing Fleet Gets 813, . Hints on Applying Corner Braces . 123 > Ale “Fizz” . , 75 000,000 Haul . 56 | Mounting a Map on a Desk for ce New Automatic Siphon a 75 Tigers and Men Fight to a Draw in Ready Reference . . 1% i Guards Hand While Slicing Bread . 75 $ India. 57 §& Steam Heater for Mash . 124
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POPULAR SCIENCE MONTHLY FEeBrRuary, 1929 EOP Table of Contents for February LEADING ARTICLES , Astronomy Coat From CABBAGES . . By Grover C. Mueller 17 Screen Production Shows Motion of How the synthetic chemist’s new magic affects your Y daily life Planet . . 62 BurLpine THE GREATEST BRIDGE. . . By Edwin Ketchum 20 ~~ Comet Discovered by an Ama- Marvels of a colossal structure to span the Hudson River _— * F Planet May Be 70 Snurrine Out a Grant CANDLE . . By John E. Lodge 22 ~— wet rozen Plane lay os How daring men fought and won a thrilling battle with a f toned oil well q ‘ F WASHINGTON AND LincoLn Botu WeErE INvENTORS By Homer Croy 23 ‘ Little-known triumphs of two of America’s great men Automobiles New Proors Tuat ANIMALS Reatiy Can Tuink By Robert E. Martin 24 Steam-Puffing Granddaddy of Mod- Amazing feats of dumb creatures’ intelligence en Auto Feund. . ”s 57 ProsPEctTING FoR GoLp BY ELECTRICITY By George Lee Dowd, Jr. 26 Keew Veer Cac | 57 Finding buried treasure with a pair of headphones Invents New Front-Wheel Drive for Liquertep Hetivum Bots on Ick ann “Freezes” Tin By Arthur A. Stuart 27 Autos. . 61 Strange new uses for America’s fireproof ee gas Tractor Sets 1, ,830-Mile Endurance A New GuIvE To THE HEAVENs . ‘ 29 Record . 63 Where astronomers have found thousands of 1 new universes Swinging Auto Crib Rocks the Baby SOS!—A CHALLENGE To SCIENCE . By Frederick Tisdale 30 to Sleep . 72 What inventors are doing to avert sea disasters One Time in Five It’s the Train That Ir You Hap Muuions To Spenp— . . By Michel Mok 32 IsHit . 72 An unusual interview with Harry Guggenheim, godfather of _ Closed Car Has Removable Top to RincsIDE SEATS ON THE OcEAN Bottom. 35 ‘i —. Hub” D 72 Taking movies of sharks and suckers from a “hole in the sea” = S yes Weisht - esign- 72 Tue Reat Fatuers or Fuicut . . . By John R. McMahon 42 hoe Soft a i il ie Continuing the intimate story of Orville and Wilbur Wright “Snare” 73 Tives Make THE Eartu Bor Over. By Edwin W. Teale 45 Oregon Village Sees Its, First Auto- How new facts are solving the mystery of why volcanos erupt mobile . _ 73 Now You Can Eat SUNSHINE . By Frank Parker Stockbridge 47 Every Little Dial Sas. a Meaning 73 Newest uses of invisible ultra-violet light ; Women Drivers Can Signal Now— Sxy Rarmway Runs To StranceE Hore. 49 No Excuse . . 15 An engineering wonder of the Alps Removing Radiator Obstructions 86 New Marvets or PLanE Design... . By Robert T. Pound 53 A Tool Compartment Lock . . 86 Why airplanes can’t be built like automobiles Both Doors Open at Once 86 Wuen THE Sxy Rams Soxpiers!_. 55 When the Battery Is Dead . 86 Remarkable experiments in fighting battles with parachutes Blowing Starts Siphon 86 Ten Dollars for an Idea . 86 SPECIAL FEATURES — Aviation Cover Desien . , By Herbert Paus Impostnc A SAVING SENTENCE ON A SPENDTHRIFT By Wallace Ames 4 eee * Monoplane Flies with - How to keep money after earning it I a ‘to Balance Pl; — Hep ror You In Buripine 12 Convertible Balloon-Dir ance Planes onvertible Balloon-Dirigible 40 Announcing a valuable new service of Popular Science Institute Test Three-Bladed Propeller. 40 Our Reapers Say— . ‘ 14 Pehle Odd All-Metal Dirigible Nearly Wuy Two Sets May Loox ALIKE, put BEHAVE DIFFERENTLY Ready to Fly. . 40 By John Carr 64 Climb he Miles to Take Air Pic- What goes on inside a radio receiver tures. . 40 Rewitrine For A. C. SImpLirieD By Alfred P. Lane 65 Huge Searchlight Batteries for East- Short-cuts for the amateur builder of sets ern Airport . 41 DecoraTivE Mera. Sawine . By Edwin Thatcher 6 “Ghost” "Airplane Nearing Comple- What you can do with a jeweler’s blade tion. . . 41 Pinc-Pone TaBie Foups Into ScREEN . By Charles A. King 7 More Records Smashed . 41 An unobtrusive outfit for a newly popular game Nae ae ae 41 ControLLinG A Move Rartway . By Frederick D. Ryder, Jr. 78 Ki wae | ye A : — ° - Tricks in running miniature trains Planes Wear Life Buoys . 41 TurninGc Rincs or Woop. . . By Herman Hjorth 79 New Gun S¢rays Bullets . 41 A master craftsman tells how to make rounded pieces New Material fer Airship Bags . 50 Luxurizs To App TO THE Home... y Milton G. Sturgiss 80 head Reslorers Find Airp mae xplore ind a New A glimpse at the new comforts of the 1929 a Suga 52 EpiToriais ._. ae eT ee ee Plan 1 World’ s Largest Airplane Plant 59 Waar Feeps Gas to Your Car? By Martin Bunn 84 Air Landmarks Should Be 7 Gus and Joe discuss fuel supply systems 4 White, Black se | fy at 26 ‘fourth Avenue, New York, N.Y, by the Popular Science Publishing contents of this magaaine must = tbe reprinted wit permission. ‘in pre- Inc. Entered as second-class matter ‘Dee. 28 , at the Post Office at —s 8 editorial co of new a of applied New York under the act of March 3, 1879; additional’ entry as second-class ence, Popular Selence ‘Monthly iy does mos underwrite the business methods matter at Chicago, Illinois. ee as second-class matter at the Post Office - the viduals or concerns pr oducing =. The use of Fooulas a lence Department, Canada. ed in U. S. A. Copyright, 1929, by the Popular Monthly articles for Se schemes is never authorized. apen, Science Publishing Co., oy Single copy, 25 cents. Yearly " subscriptions to President and Treasurer; R. Vice-President; AL Cole, ° | ! |
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RY, 1929 10 15 Fesruary, 1929 POPULAR SCIENCE MONTHLY rem: “Beams ”” of Sound to Guide Air- craft in Fog . Bird’s-Eye View from Plane Reveals Buried City. . Sees Fights Fire i inthe Air. . “Prop’’ Blades Made Hollow Hops from Train—Crash! “Aerial Fish Express’’ . Duration Record Stands . Engineering Five-Mile Highway Built Across James River. . Bolstering Up the Leaning Tower of Pisa Suspended by Crane, House Rides Across River. . : World’s Greatest Gas ‘Line Exceptional People This Dentist Had Courage 3 He Built His Own Castle—on the Ground . He Made American Flag of 33, 000 Wheat Kernels . Paints First Scientific Portrait of Spectrum. Health ond Hygiene New Cancer Hope Weak Feet Walk on . Air in New Arch Support. Life Span 100 Years by 1950? Ex- perts Differ . Masks Safeguard ‘Health of Paint Spray Users . Compressed Air Drill New Aid to Surgeons. Grafts Part of Human Eye i in Amaz- ing Operation . Tests Show Canary Bird Is Best Gas Detector. . Doctor Makes 7,000-Mile Call by Radio. . Colds Blamed on Lack of Proteins in Diet ‘ Laboratory Sinai An Artificial Heart! . 7 Thunderbolts from : a Glass Invisible Forces Photographed! : “Lightning” in Auto Motor. . New Experiment Confirms Findings of Einstein . Ee ee a a Models Making Movie Thrills with Tiny Toys . Traffic Problems Revealed by Work- ing Models . . : Building the Buckeye State . Whittling Model Propellers . Nature “Busy Bee’’ a Myth—He’s a Loafer, TestsShow. . Rocky Mountain Wilds Are Pre- served for Science . . . English Hard for Parrots. . Big Trees, Centuries Old, Found to Be Fireproof . Tiny Ocean Plants Build Houses of Health Glass. . Landmarks Guide Pigeons Home? . New Sugar Discovered in Dahlia Juice. . ; Lizard Hypnotized! F If Brain.Size Counted, the Whale Would Be Smart. A New Kind of Mosquito! This Makes 141 er ; From Mountains of Mystery, Killed by Too Much Light . . 132 . 132 . 132 . 182 . 104 . 150 . 150 § Necklace 35,000 Years Old 62 73 132 59 63 69 75 37 68 70 7 50 56 58 59 61 63 73 74 51 51 63 68 69 60 92 56 56 58 59 71 7 74 75 75 75 . New Devices for the Home New Electric Broiler... 38 Straight-Edge Ladle Gets Food Out 38 Handy “Automatic Pincushion” . 38 Extracts the Last Drop of — Juice. . 38 Gas Refrigerator and Range i inOne. 38 Pie Pan Has a Handle . 38 Waffle-Iron with Built-In Thermom- eter . cae . 38 Novel Frying Fok . . . . . 38 Egg-Timing Alarm Clock. . 39 Springs Operate Odd Kitchen Churn 39 Wall Hook Snags the Clothesline . 39 Newest Holder for Steel Wool * 39 Keeps the Percolator Top from Fall- ing Out . 39 Combination Toaster and Percolator 39 Nonspill Salt-and-Pepper Shaker . 39 Makes Either Coffee or Tea. . . 39 Electric Sandwich Toaster . 39 Built-In Medicine Cabinet Has Ad- justable Mirror. . . 39 New Processes and Inventions Drives Rocket Motorcycle . . . 37 Detects Artificial Pearls .. 50 Swimming Turtle Is Hour Hand of Novel Clock. . 56 Air — Drives Novel Cata- mara: 56 Soldering Jobs Simplified by Electric Furnace . 57 Traveling Shears Clear Phone Lines of Litter. . . 60 Self-Dumping Scow Turns Somer- sault in the Water... 61 New Hand Truck Picks Up Piles of Boxes. . 62 Principle of Range Finder Applied to . Depth Gage. . 62 Fabricated Lumber Cut in Lakor- Saving Shapes . 68 Amazing Machines Do Work of an Office Force 69 “Fountain Pen” Pistol Can Shoot Deadly Bullets . . ‘ 69 Would Foil Bank Robbers . . 70 A Mechanical Substitute for Tailor’s Shears. 70 Folding Pushcart Runs on Rubber- Tired Wheels .. 70 Three-Wheeled Motorcycle Runs on Endless Tread . 71 Novel Card Table Serves Also as Movie Screen . 71 Dry Cell Blasting Device Resembles Flashlight. 71 Tin Can Filling Station for Ciga- rette Lighters . . 74 Tiny Dynamo Operates ‘New Bat- teryless Flashlight . . . 74 Holder for Pipe Cleaners. . 75 Novel Lamp Cord Holds s Cigarette Lighter .. 75 Radio Radio Pictures Made Lifelike . . 58 A Useful Transformer Test . . . 67 When Batteries Play Out . . . 67 ABC’sof Radio. . 67 Handy Radio Aerial Mast Clamps to the Roof... 69 Stations Identified | by This Radio es + + 74 Unusual Facts and Ideas One Jump Ahead of Death!. . . 36 Modern Cave City. . . . . . 87 Light Organ Paints Scenery. . . 37 ee ee eRe 50 g “What Can I Make from a Block?”’. 129 ® Each Color HasIts Number . . 50 Farmsinthe Sahara? . . . . 50 Will the Ocean Overflow? . . . 50 The Tropicsina Box. . . . . 651 No Fire in Redheads? . . . . 51 Every Man His Own Still . . . 51 Cathedral Blasted from Cliffs . . 52 Human Body’s weed Reported Photographed . 56 Opals, Once Feared, Today Yield Vast Fortunes .. 57 Latest Ice Cream Cone Wears a Bonnet . 57 Searchlight on 1 Wheels Aids Fire Fighters. . 58 Cameraman Snaps Torpedo ‘Diving into Waves. . 58 Gypsum Increases Soil’s Capacity for Moisture. . 58 Tribesmen Jail Idols if Prayers ‘Are Unanswered. . 58 Begin Search for Diamond Fields in Canada . 59 Your Busy Heart Is Fed by Tiny : “Dinner Pails” . 59 Rubber Band Returns Ball in One- Man Tennis. . 60 Chemical Makes Open-Air Ice Skat- ing July Sport... 60 Catch Birds in Fish Nets. . 61 Where Half of the World’s Gold Is Weighed. . 61 7s Typists’ Fingers with Radio 62 Wails 1 Hide Radiators in Novel Heat- ing System . . 63 Stunning Gowns of Metal Soon May Be the Style. . 68 Put Milk in the Dark to Keep It Fresh. . 69 Urge Metal Storage for War Needs. 69 Nobility Not Degenerate, Genealo- gists Assert .. Te ae Europe May Soon “Eat” Its “Drinks” in Solid Form . . . 70 Gives American “‘Talkies’’ Foreign Tongue . 70 Find on Handwork of Cave Men Jewelers. . : 71 Road Signs Teach Geology — 72 Holland Tunnel ae 8,500, 000 Carsina Year . 72 Colored Telephone Poles to Liven Landscape . ‘ 73 Tin Foil Amazingly The... 74 Did Man’s Legs Develop Before His Head?. . . 74 — a Real Storm Warn- 75 Colored Snapshots—When? . . . 150 The Men Prefer Blue. . . . . 150 For the Home Owner - Upholstering Old Chairs. . 102 Fastening Objects to Plaster Walls . 127 How to Waterproof Shoes . . . 128 Hints for the Mechanic TimesaversforShop Men . . . 94 Old Bill Says— 94 Turning Oversize Work i ina Lathe. 96 Ideas for the Handy Man Now for Winter Sports . . . . 90 Choosing a Paint Sprayer . 100 Cannon for Shooting Snowballs. . 101 Blueprints for Your Home Work- Gs. | «s,s =, ea a Varnishes in the Home Workshop . 108 Weatherstrip for Bottom of Storm 121
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POPULAR SCIENCE MONTHLY Marcu, 1999 ee WHAT IS NEW THIS MONTH Table of Contents for March LEADING ARTICLES I Am Learnine To Bea Fiver. . Vivid experiences of a greenhorn student. pilot How Tury Sank AND SAVED THE S-4 By William W. Moss, Jr. The Navy’s daring test of submarine rescue devices A WEEK INTHE AIR . . By Major H. A. Erickson Thrilling moments in the record- -breaking flight of the Question Mark SETTING THE TyPE BY WIRE! . By John E. Lodge How sizzling news is sped into print WHEN THE Sun Grows Co_p. By Frank Parker Stockbridge An amazing prophecy by one of science’s leaders Scorry ALLAN—MAsTER OF THE FROZEN TRAILS Tells His Own Story to Fitzhugh Green Adventures of the famous Alaskan racer and his sledge dogs Science Takes Stock or 1Ts CoNQUESTS Leaders in research inventory the year’s great advances A Famous Sxy-Writer TELLs or His Jos By Capt. O. C. LeBoutillier and cross “‘t’s”’ in mid-air By Jack O’ Donnell ‘*snappy’’—dramatic By Larry Brent How daring aviators dot “i’s’’ Once Epison Was An EprtTor But he was thrown nto the river for being too episodes from his crowded life Tue Reat Fatuers or Fiicut . . . . By John R. McMahon Gliding with the Wright brothers—another installment of a great story HunTING QUAKES IN A SUBMARINE . . By Norman C. McLoud The S-21’s amazing discoveries at the bottom of the sea WuEN THE Rapto Lion Roars . By Edwin W. Teale Back-stage secrets of a broadcasting studio New Fyne Fievp ror Roor Tops , An ingenious invention which may revolutionize airports SPECIAL FEATURES Cover DeEsiIGn . . 7 . By Herbert Paus How Jack Nevins MADE Sur: RE OF r His FaMILy’s Prcanctas, FutTurE By Wallace Ames What is a sensible program of life insurance? CuoosinG Toots To Last. .. By Major Carlos De Zafra Tests of screw drivers by the Popular Science Institute Our Reapers Say—. Back or THE Montn’s News _.. By Karl Vooght Absorbing bits of romance and wonder behind latest discoveries CasH Prizes ror Set BurLpErs . An unusual contest for amateur radio fans Super-Power ror Your Rapio . How you can build a high-volume amplifier Way a “Cueap” House Costs Most How to spend your money wisely in building Tuts Mopet Broke Au Recorps . By Vincent L. Johnstone Complete plans for a tiny seaplane that flew 1214 minutes How to Turn anp Intay Trays. By Herman Hjorth New designs for lathe-working enthusiasts EpIToRIALs . , , How THE IGNITION Sree Works : "By y M erties Bunn Gus explains the secrets to a driver stalled on the road CyLinprIcaL GrinpinG HELPs By Hector J. Chamberland Inside facts that every machinist should know By Alfred P. Lane By Milton G. Sturgiss 28 30 32 42 46 53 12 14 48 63 64 74 78 81 82 84 92 Astronomy Finds Seven Tiny New Planets . Mysteries in the Moon . Model of Greatest Telescope Com- pleted. A Billion Meteorites Hit the Earth Each Day .. Scientist, Near Death, ’ Stays by Meteor Find Suggests Martians Fired “Light Bombs” at Us a ae Automobiles Tests Show What It Takes to Make a Car Skid ae, Know Your Car . Headlight Glare Reduced by Two New Devices. Auto License Always Handy with This New Safe ._. New Automatic Gear Shift Invented Four Useful Auto Tools Combined inOne . You Simply Drive U p ‘onto This Jack; No Pumping Electric Robot for “Home, James”. This “Steamer” Is 34 Years Old, ‘and Still Going! . . The Motorcycle Steps Out as Auto's Rival “Stay Alive” Club Seeks to Make Streets Safe . : a to Fix a Broken Spark Plug A “‘Raincoat”’ for Ignition Handy Garage Door Stop Piston Ring Compressor . Sticking Tires Remedied . Autos Says Aviation Airport Lights Sunk in Ground . The Airplane Junk Yard Arrives Airplane Service Stations, Too . Laying a “Carpet of Light” When Army Blimp Takes Gas . America’s Largest Passenger Plane . British Torpedo Plane Tested And Out YouGo! .. A Foghorn for Airships Plane Plants Grass Seed . “No Smoking’”’—But They I Do . An Amazing Stunt ; Better Roof Signs. Warns of Sleet on Wings America Hails the Autogiro . Net Catches the Air Mail ; Plane Helps Police Capture Fugitive Night Planes Flew 15,000 Miles in a «Sr Serie Boy Flyer Wins $1,000 for Coast-to- Coast Hop . ' Longer Range for Planes - 165 49 49 88 40 40 40 40 40 41 41 41 41 41 41 41 41 41 52 54 66 68 72 ey 1929, Vol. 114, No. 3. Foouiee Sofence Mont pe > published month- at 250 Fourth Avenue, New York, N. Y., by the *9 r Science Publishing re Inc. Entered as second-class matter ‘Dec. 28, 19 8, at the Post Office at New York under the act of March 3, 1879; additional entry as second-class scien: matter at Cateeae, Iilinois. Entered as second-class matter at the Post Office of the rtment, C ted in U. 8. A. Copyright, 1929, by the Popular Science msablishing Co., Inc. Single copy, 25 cents. Yearly subscriptions to Popular Science Monthli individuals or concerns pr Monthly articles for stock-selli President and Treasurer; R. C. United States, its possessions, and Canada, $2.50; foreign countries, $3. contents of this magazine must not be reprinted without permission. In pre- senting 2 its editorial columns numerous stories of new products of applied i not underwrite the business methods ng them. The use of Popular Science Capen, am Vice-President; A. L. Cole, Secretary. * is never authorized. O. B. The a ee
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SH, 1929 —————__. ‘9 ‘9 0 7 QO Cri ee eS ee ee ee OOo oO oO Crew SF eanlea POPULAR SCIENCE MONTHLY ee ea F MARCH, 1929 ; Engineering ¥ Adjustable Casserole and Pie Plate Lives Saved by a Scarf! . 37 Holders . . 76 | Every Snowball an Art Galle 39 Saving Niagara’s Grandeur . 48 | Hanger Keeps Dress from Slipping 76 | Creates “Chemical Man” ai 50 Engineer’s Puzzles Prove Abilities of Versatile Kitchen Table . . 76 | Ancient Words Still Live 50 =m = ie 52 — Ventilator Fits Any Win- Steam-Heating Outdoors 50 Longest uspension pan earing ow 77 | Uncle Sam Runs a Laundr 51 Mg ay a al is 58 —_ > Cabinet Hides Phone and A Rattle 2,400 Years Old , P 54 e Man Controls c in New 77 | How Much Do You Know About Vehicular Tube . 59 |° Screwless Closet Bar Installed in 30 Chemistry? .. 55 Gas Lines from Ruhr Will Supply All Seconds... 77 | Traveling Sawmill Made from Old Rory | oe 60 — Casters Cure Table’s Motor Car . . : 55 ngest Truss Bri ge s Built in () . 77 | “Paint” Cars with Fabric . 55 Netherlands. . 71 | Sewing Cabinet Folds Like Screen . 77 | Earth’s Shape Altered by ‘Tides i in ‘ Electric Iron-Comb Renovates Furs 77 Its Crust? . 55 Health and ieee, “Lamp Bulbs” Glow in Bathroom Make-Believe Liner Built for Movies 56 Claims Victory over Yellow Fever $1 Py 4 ning Ref - rir —_ er. ” Seainine Witney Wieuen, Bocee - urning rigerator 77 | O . or Na ~~ by Tanks in in iad io Sircken . 7 ee New Processes and U. S. Has 6,643 Bridges . 57 Rules for Baby’s Sunbath . 58 5 They Fastened on Buttons Centuries aes * 5,000 Years Ago, in Scan- - Inventions he 57 ave - - s New Poison Gas Destroys Armies 48 ane * ‘Mystery House” Looks Few Children; Long Life? . « « @l pment aes g Apparatus . 50 Like a Village . . 57 Ills from ee : i Cc 71 | Does the Work of 400 Men. . 54 | Armchairs of Rubber. 58 Tiny Fever! e o8" —He Carries 12 ae Section Gang Cleans —~ Armored Submarine Built ys Mes 54 y France . 59 ° ° Dashboard Cigarette Case Supplies Burning River Mud for Electric Laboratory Seni a Ligh ght, Too. 58 Power . 60 “Hot I New Marvel. . . 50 | Novel “Sledmobile” Needs No Hills 60 Phonograph Needle a Heavyweight 60 ata a Machine 51 | Door Lock Turns Out the sees as Fishing Two Miles Deep! . . 66 Tame Deadly Rays to Make Rubber. 55 R You —— New Gl dian 60 ng Prosge o> a 66 z “ emar e New Glass Can Be n Age of Electric Power . . . 66 ed a —_ ” —— 69 Sawed Like Wood . . 61 | Power Snowplows Keep Alpine Light Remains a Mystery . . . 73 Furfural, Once Rare, Now Made Roads Open 67 Mining Wealth in the Air 166 from Beets . . 66 | New Yorkers Talk over 8,000,000 Hair-Splitting the Inch - 166 a —_ for Telephone. af 66 — of be es i af 67 olding mbrella Carried in Wom- 20-Year Avalanche Warning Saves Models an’s Hand Bag 67 Villagers’ Lives. . 67 When School Work Is F Build Seals or es , a Drafts Auto- Pine Trees from U. S. in Demand en School Work Is Fun—Building matically. 68 Abroad . 67 Ships. . . 66 | “Vest Machine Gun” Pours Bullets Does Your Wife Burn the Toast? Finishing Our River Packet. . . 96 into Bandits ; 69 Here’s Why 68 Rigging eit Sate . ¥ = aor re Peaches Now Measured a — Senolies Heat for Railway ‘a . y Machine. . ion . Coins Rapidly Wrapped by Counting Lamps Provide Midnight Sun for Nature Machine : 69 Golfers. 68 Quills, Not Teeth, Protect Australia’s _ hl Lantern Lighted by i a Fishing Season on the om Anteater . . 34 | «Mechanical Snake” Cleans Drain Girl Explorer Hunts for Sol The Battle of the Turkey Cocks . 34] “pines — el omon's 7 The World’s Ugliest Animal. 34 | Cotton-Lined Paving Found to Im- Rivetless Ship Launched. 70 i ae ae > Cranky Ds prove Roads . 70 | Women Stick to Jobs Better Than — Te, Bie "Tha Ow 34 | Microscope Lenses for Spectacles 71 Men . 70 "a oy 88 — 7 34 | “Electric Hand” on Brakes Prevents Chinese Serve Monkey Brains at A Bird That Dances a . Jig 34 Train Wrecks ” —— 2 ; Dampness of Lumber | Measured Coal Delivered Like Food, inCartons 71 = Prairie Dogs’ Abode with os Quick as Magic 73 | Voices of Famous People Preserved 71 PS wn Se ae 35 Double Keyboard Piano Plays Stammerers Not Backward . . 71 The or pt Mara ie Strange Music . 73 —, War Chariot Is Found in oa cae alestine . 72 ee Sarat eBay Oe Photography Fight wi Hi-Hat for Cam inthe World . 2 35 | Plants Star in the Movies 38 phor Supply ‘ 78 This Bird EatsSnakes . . . . 35 wg wa ~ Birds titiad et 49 For the H Lion Cubs Playful as Pups .. 35 1c ovie Camera Takes Pano- or ome Owner He Loses Gills end Moves to Terra rama of CardGame_. 57 | p anaes Wall Firma . . $5 | Automatic Machine Prints Photos a M — * Ww, ll Pap o —— the Line,” Ram Style . 85 at High Speed . : 70 Easily Bus ‘lt Table for Games 7 . 124 enomous Tarantula Lives as Long m Posvuntinn Main Genaee:, g Rugs from Slipping. . 126 Bird Pei er Producers Protected : Radio Mow te Fuaes hashing amen ee Gi , Sk | Added to Col Danger in Short Radio Waves? . 49 | Removing Old Kalsomine . 187 y nel fa Study. to Col- g7 | Turning Radio Static into a Weather “mae Prophet . 54 . ° Sweet-Tooth Skunks Raid Hives 68 | pow to Adiet Vous Mew these Hints for the Mechanic a Toad Aids West- 60 for Hairline Dial Settings . 62 | Dodging Errors in Shop Work . . 94 Caterpillar Army Fights ‘Cactus - ae by le al y~ Small Motor Drives Lathe . 192 ee: ae eee oe ABC’sof Radio. . . . . . 62 New Dest the H This Housewife Discovers Kettle Ideas f or the H andy ane ew Lrevices f or the £10me Really Sings! . 71 | Chests in Popular Designs New Kitchen Servant Runs from Radio Signal Strength Is Recorded I Add a Shop to My Garage. = Wall Motor. . . 76 in Colors . 72 | Veneering Isn’t Hard toDo. . 90 Steam Heat by Wire 76 | Knows His Radio's Voice. 73 | How to Make a Magic Funnel . . 100 V Cl 4 d Floor Polisher 76 BI ts for H Ww. ksh 108 acuum Cleaner and Floor Polisher ueprints for Home Workshop. . Turns Milk Bottle into a Pitcher . 76 Unusual Facts and I deas Home Workshop Chemistry . . 110 Food Jars Keep Crackers Crisp 76 4 Stealing the Sea’s Salt 36 4 Cutters for Making Dowels . . 184 .
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POPULAR SCIENCE MONTHLY APRIL, 1929 Table of Contents for April LEADING ARTICLES sj Astronomy m . Poison in Comets... 46 penaant s Topsy-Turvy Wor.LD . By Alden P. Armagnac 17 Bolt of fron Cast from the Sky 49 ing aspects of the new theory of Nature’s forces How Steclickt Is Menswed b Su! pga RE ee Peace ye Bh oe a Norman Foster 20 Photo-Flectric Cell y 54 n actor’s vivid story of sound pictures in the making : PLANNING A 44-MILE TUNNEL! : By George Lee Dowd, Jr. 22 —— Registers Heat from 56 How engineers aim giant tubes at an invisible bull’ s-eye Light from Tumbling § Suns Astives in A Macuine Tuoat Makes Heroes By H.C. Davis 23 800 Years 70 The thrilling role of the radio compass in rescues at sea Fiyers Open THE Wor Lp’s Ice Box . By Edwin W. Teale 24 , Strange mysteries of the Antarctic revealed Automobiles Switcuine On THE SuN ‘ By Robert E. Martin 27 How to choose and use a health lamp Another Speedy Challenger . 34 I Am Learnine To Be a Fryer, Parti. By Larry Brent 28 Challenging U.S. Speed Records . 35 A student pilot’s story of his first trip in the air pa gus e Controls Traffic 35 RUNNING A SKYSCRAPER. . By Peier Vischer 31 oo ded — _ om Still R 47 Odd experiences of the ‘ ‘mayor’ ’ of a perpendicular town Tin " Stvl " . . uns in 57 Tue Biccest ENGINEERING Jos Hoover Ever TackLep was at ; 61 By Will Irwin 32 id Vv A keen analysis of our new President by an old friend Rosrng Win Wap Working m0 Tue Rea Fatuers or Fuicut, Part IV . By John R. McMahon 42 Trick Valve-Grinding Tool . 90 How Wilbur and Orville Wright soared on wings at last A Self-Starting Siphon . 90 Wircues—Stitt oNTHE Jos! . . Cl. . By Arthur A, Stuart 45 Running-Board Tire Rack 90 Curious results of the human mind’s craving for wonders Ten Dollars for an Idea! . 90 CANNONBALL BAKER, AUTOMOBILE “‘BroncHo BustER” Tells his story to Henry Morton Robinson 50 apt Thrilling adventures of a famous road racer Aviation Are You IN THE Rigut Jos? __.. ; By Ruth Moore Morriss 52 Psychologists prepare new tests of your aed U. S. Gliders Match Skill 34 SLAYING THE Ice MonsTERs . : By Michel Mok 53 eter agen ore = How experts trail bergs and blow them up America’s Latest Air Liner . 40 ———t the First Steam-Driven r 40 SPECIAL FEATURES A Snhdienney New Airplane Motor . 40 Cover Desicn . By Herbert Paus Gasoline Gage Marvel of Accuracy . 40 FrxancraL RACKETEERS By Wallace Ames 4 Super-Sensitive Altimeter Detects The financial editor’s monthly advice Five-Foot Drop 40 REFRIGERATOR OR GERM-BREEDER? . By F.G. Pryor 12 Mammoth Flying Hotel for 80 Why many ice boxes are a menace to health Passengers. - 4i Oun ReapensSay. ... 14 Transcontinental Air-Rail Route 41 Gumpses or PeorLe Worta KNow1nc 26 oom a. ; = pter That Works? 41 Thumbnail sketches of outstanding personalities New Goggles for Airmen 41 Back or THE Montn’s News By Karl Vooght 46 Britain’s “Question Mark” . 41 Interesting facts and comment illuminating the latest events in science Rescued from the Tree Top . 46 GettinG THE Best Tone rrom Dynamic ee Alfred P. La Wing Strength Tested by Piles of y re ne 62 Sandbags 54 How to build a radio baffle board Lindbergh’s Trophies Fill Wing of Taree Waysto Burry a Ravioli. ‘ By John Carr 65 Memorial. 54 Timely suggestions that will help you to choose a design Planes Glide into River Like Ducks 54 Locxine Out THE Heat anv Cox . By William Dewey Foster '74 Sturdy Monoplane Wears Stream- Inside facts about insulation in house building lined “Pants” . : 55 Wao Can a Ppa mnee? a at ad 79 oe oy Out Giant 12-Passen- 55 One of the world’s most perfectly equip ome wor ops Turninc Fancy Boxes anp Bowis «5 «(5 «SCw«SOBy Herman Hjorth 80 R-100 | Passengers to Land on 55 ooo the wood-turning lathe to best advan - 82 Sign of the Pawnbroker Urged as Air Ir Your Heapuicuts Went Ovr— . By Martin Bunn 84 Crap Eopgelin & to Explore Arctic near - Gus gives the rules for safe driving aska 58 A Lieut Hanp on THE WRENCH . By Henry Simon 96 War “Birds Flit from Floating 2 Nest Secrets of handling tools ‘4 Built like Dovecote . . 71 QaadS Re tth Wide Saw PE Scloner Mememazmmimueee ment: Cute, rte se ueateton, tat Covad, $2, role commie. SE, The , Inc. Entered as second 918. at the Post Office at senting 2 its editorial columns numerous stories of new products of a ied New York under the act of Mareh. 3 3. 1879; additional entry as second-class sci opular YY Monthly does not underwrite the business methods matter at 5 Coreen. Illinois. Entered as -class matter at the Post Office of the sitions « r concerns _ ucing them. The use of + ewig 4 ..-—— Departm Canada. Printed in U. me) A. Copyright, 1929, by the Popular Monthly articles for stock-selling schemes is never authorized. Capen, Science Publishing Co., Inc. Single copy, 25 cents. Yearly subscriptions to President and Treasurer; R. C. Wilson, Vice-President; A. L. Cole, Ssoretery:
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Apri, 1929 POPULAR SCIENCE MONTHLY FE OEE ————— Huge Searchlight’s Beam Will Guide Air Liners Chicago “Hub” 565,406 Miles Engineering Launching a 500-Ton Gate . Why Not Weld Them All? New Dredge Driven by Diesel Motors . England Seeks Fog-Proof Building Materials. Six-Ton Slate Block Hoisted from Quarry p for Planes Flying Ruastions —— He’s Inventor, Executive, and Rail- way Conductor . Snake Guardian a Part-Time Ww eath- er Prophet . World’s Only Masters of Strange Inlaying Craft . Doctor Helps Cripples ‘with Own Free Inventions. Builds Sailing Yacht of Turkey Bones Paints ‘‘ Einstein’’ Pictures of ‘‘Ener- "in Art. Mail Carrier Has "“Circled Earth” Seven Times... Pedals 175,000 Miles on Bicycles i in 20 Years : A Riveter for 50 Years, He Claims the Record Health and Stink Sciences Combine to Save King George's Life. Dyeing the Blood to Keep You from Dying . o> Key to -™ Life?. Finds Some Germs Prefer Blonds for Victims .. Can You Give a Name to Ultra- Violet Ray? . : Boys Build” “Human Engine” in Study of Anatomy . Three Chemicals of Life Flow in Our Blood Physician Feeds Patient Through Pain in Skin Sees “‘ Magic”’ in Medicine . Laboratory Discoveries Chemist Claims New Way to Harden Precious Metals ‘ Five Million Volts! . . Testing with Mechanical Hands Study X-Rays behind Barricade Tells How Wind Sways Towers — Torch Reveals Microscopic ife : ee es Nature Fresh ‘‘ Milk” Right from the Bark Why Sap Rises First ee, Cat Had Teeth Like Daggers . Gulp Takes ‘Whole Deer at One G “Sneezing” Plants Spray Their Seeds into Air . Zoologists Seek to Save Whale from Extinction . Walnut Trees Kill Plants Whale Eats Millions of Shrimp for Lunch. , Salamanders Grow Eyes New Devices for the Home Nonskid Anchors for Your Rugs A New Automatic Toaster — Latest Dishwasher Wheels to Table No Tears in Onion Chopping 71 if 72 47 56 66 36 36 36 57 67 69 69 69 46 46 48 56 57 58 58 66 67 46 47 48 69 49 49 58 58 61 66 66 71 71 76 76 76 64 New Adjustable Can-Opener 76 * Letter May Tell Secret of — Ice Pick and Bottle trad”’ 59 Opene ,s 76 Would Banish Cupid for Rule of Safety Lock for Gas Cocks . 77 Eugenics. 59 A Stand for Your Razor . 77 | Electric ‘“Bos'n” Shouts Orders on Novel “‘ Cooking Cabinet”’ 77 Warship 60 Wall Recess Guards Hot Iron. 77 | Quake Takes a Short Cut through Handy New Broom and Mop Holder 77 Earth’s Center. . 60 Miniature Washboard for Dainties. 77 | Angel Fish Brings Deadly Bacillus to Aquarium . 60 New Processes and “= Much Do You Know about hysics? . 60 Inventions Finds Germs Existed Before Dino- Train Obeys Its Master’s Voice “©. 35 saurs. . oe 61 Ready-Lighted Cigarettes Pop from Wanted—Three-Eyed_ Fish!. 61 This Holder. . 60 | Discovers Vast Plateau on Brazilian Deliveries Locked Up by Kitchen- Border ! 66 Wall Receiver .. 60 | Tear Gas Warns of Poison . 67 Devises Weights to Stop ‘Trains from Sandbags to Strengthen Hands of Crashing. 61 Pianists . . 67 Lock-It- ion Latch Foils Winds and Want White Hair? Then Use X-Ray Robbers. . 61 “Bleach” 67 Automatic Device Sends Out $ OS Underground Gold Vault Rivals Calls . 61 Hugo’s Fiction ._. 68 Divider Slices Pies into Cuts of The Same Old Money, but in Equal Size .. 67 Smaller Paper Bills .. 68 Dials Show Time-Table of Trains at Gas Masks to Be Used in Fight on aGlance_. . 68 Hay Fever .. 69 Folding Bicycle Carried Like a Type- Detects Secret Message by Shading writer 68 of the Ink . 70 Crashless Crossing Gates Bend Like Gunny Sacks from Banana Trees . 70 a Bow 69 | A Trainload of Gasoline Goes Up in Double. Walled Pot Keeps Flowers Smoke . 70 ° Watered . 72 | Lower California Is Rising from the Sea 70 P holography Finds Babies Are Normal Despite “ ” : Parents’ Ages . 71 —— a ae 60 — Beauties Skate on n Sunproof a «“é ce . Snaps New Canyon 79 | One Twist of the Wrist Sprinkles 10 Tiny Camera Photographs Inside of Acres 72 Stomach. . 72 —" Prancing Trains Postmen - Dressing Up Your Photographs - - 92 to Wa ° Taking Pictures Backward . . 104 — Manufactures Its Stained 73 " : a ; Titles for Amateur Movies . . 127 Many Uses Combined in One Water- fs ing Radio Canadians Will Use Peat to Reduce Radio’s Puzzles. 49 Coal Bills. 713 How to Hook a Phonograph to Your Snake Bites Killed 27 in U. S. in a Set . 64 , 73 Tone = Quality from Records . 64 pecial Receivers . A 4 64 BCed Rade | oa For the Home Owner Researchers Baffled nd ‘Six Radio More Closet Space. . - ee Mysteries 67 | Emptying a Washing Machine . . 102 Controlling a Bathroom Light . . 102 Unusual Facts “a I on How to Tell Wool from Cotton. . 115 Teaching a Young Gorilla Tricks 36 | How to Do ns with Siete Odd as the House Jack Built 37 Guns . 122 Pulls Train a mee Long! 38 he Handy M Around the Pole ina Saucer. 39 The World’s Healthiest “Spuds” 48 Ideas f wad f — Benjamin Franklin’s Broom 48 | Sewing Table in Modern Style . . 78 What Is the Right Size? . » 48 | Hammering Out Metal Trays ... 81 New Wonders in Glass : 49 | One Bench That’s Big Enough . . 94 Tests Breath of Honeybees . 54 | Turning a Flagintoan Egg. . . 104 Test “Cast Stone’”’ Strength with Landing Gear for Model Planes . 106 Tiny Cylinders . 55 | Blueprints for Your Home Work- Tiny gee on Man’s Back Pushes shop . . 108 Him Uphill. . 56 | Metal Fastenings for Woodwork . 110 Motor Boat Leaps through a Hoop 56 | Turning Large Work on a Small Use Poison Gas to Rout Foes of Lathe. 112 Pineapples . . . 56 | Novel Way to Bend Bamboo for These “Cukes” Cannot Fail. 57 Model Airplanes. . . « Plans to Use Tung Nuts for Making How to Display a Ship Model . 114 Paint Oil. . 57 | Mixing a. Low-Cost Varnish Re- Electrified Water Keeps I Fish Out of mover. 116 Ditches . ‘ 57 | Small Baltimore Clipper Model Is Nitrates from Africa . 58 Easy to Make . . 121 Hoard in England Adds to Bronze Parrafin Seals Paint Cans . : 194 Age Mystery 68 | You Must “Strike Gold” to Win Five Years’ Work to Quarry One This Game . 125 Block of Marble 59 | Small Crucible Made from a Battery Gas Blows * Mile of London Streets Carbon 128 59 4 Inner Tube Makes a Punching Bag 128
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POPULAR SCIENCE MONTHLY May, 1929 —..., LEADING ARTICLES i Astronomy Pouttine Licgutninc TO Work . By Robert E. Martin 17 Taking the Moon's Temperature “7 Why engineers spent $75,000 to take one photograph ~~ Built Out of 57 Ecuipse To Cueck EINSTEIN. . By George Lee Dowd, Jr. 21 Astronomers Say the Moon is Brown; What astronomers may learn from the next solar spectacle Mars, Green. 58 SrRANDED—SEVEN Mites Up! . By Alden P. Armagnac 22 Designs Great Telescope Mirror Like A veteran Air Corps pilot tells of his biggest. thrills Honeycomb . 66 War Gas Ficuts Peace-Trme Foss. . By Alfred P. Reck 4 . Queer jobs that Uncle Sam’s chemists are finding for trench poisons Automobiles A Biecer Ditcu THAN THE PANAMA , By H.C. Davis 25 Hanging by an Eyelash! . 34 Facts everyone wants to know about the proposed easuenn canal Women Drivers Have More Acci- I Am Learninc To Be A Fiver—PartIll. . . By Larry Brent 26 dents, Survey Shows . 56 A greenhorn pilot tells what his first forced landing feels tke Bus a on Extra Wheel If a Tire Puiay TaG WITH Dynamite! . By Edwin Ketchum 29 Phy ll a - How experts are seeking a “foolproof” explosive Weather P 58 Do Birps Fy sy Rapio Compass? . By Michel Mok 30 Lock for Emergency Brake to Pre- Why migrating flocks don’t lose their way vent Runaways... 58 Tue Man Wuo Mave Rapto TALK . By Frank Parker Stockbridge 32 Odd “Flivver” Craft Rides on Land The romantic story of Lee De Forest or Water. 67 Maxine New Maps oF THE SEA 37 Leaping Car Lands on Another . 70 Perils of the hydrographic engineers How to Check Ignition oe 88 How Human Mo es Dic River Tuses.__.. 39 An Automatic Light . 88 A picture story of the marvels of subway construction Valve Adjusting Tool 88 X-Rays Trap Art CouNnTERFEITERS By John E. Lodge 42 Spring Compressor. 88 How science can tell a fake from a genuine ‘‘old master” A Simple Hood P. rotector 88 Tue Reaw Fatuers or Fuignut—Part V. . By John R. McMahon 48 Ten Dollars for an Idea ._ : 88 How the Wrights, idols of Europe, first “cashed in’’ on their plane Tools to Keep Your Auto in Repair 163 SrraNnGce Eyes Tuat NEvER SLEEP . By Arthur A. Stuart 51 ’ Latest marvels of automatic machines that “‘see’’ and almost think Aviation SrEAMER Carries A MILE oF Cars. . 53 Details of an amazing ocean craft that swallows a whole freight train mee ees - = a Pane -Proof”’ : 40 Model Propeller Pulls 15 Pounds 40 SPECIAL FEATURES an renee Bie Laer ng ectric Wire Ai in unne Cover Design. . By Herbert Paus Tests. 40 Goop Investments Can Be Misrits By Wallace Ames 4 Airplane-Dirigible Hybrid for Britain 41 Counsel from the financial editor Mail Plane’s Shadow on the Sands. 41 Tue Facts on House Insunation . 12 — Airplanes Now! . _ Housebuilding tips from the Popular Science Institute of Standards ew Safety Slots . 41 Oun Ruapans Say 14 os Air a of Steam . 41 inte ; aes utogiros for America 41 Gupses or MEN IN THE Pusuic Eye . 20 Huge New York Airport . 41 Interesting views of unusual people Radio Lights the Airport. 41 Back or THE Montnu’s News. . By Karl V. ooght 44 How Airplane Carrier Crews Keep Where latest achievements fit into the picture of progress Fit. 55 Hitrcutne Poonocraps To Rapio . . By Alfred P. Lane 62 Three Men Have Wild Ride in Runa- How to connect an electrical pick-up way Balloon. . 55 UNSCRAMBLING THE Rapio HasH. . By John Carr 65 Students Now “Fly” without Leav- Facts about interference every fan should know ing Ground . 71 Comrort Bexinp Brick WALLs . By William Dewey Foster 74 Plane’s Siren Switches On Airport Building charm and durability into an economical home Lights! . 72 Dup.icaTING AN ANTIQUE MIRROR . By Frederick J. Bryant 78 New ee Goes the Limit in Wing How to make a beautiful walnut replica at small cost Stagge 4 72 Bowts Mabe with A HaMMER By Edward Thatcher 79 First After the Wrights 139 Simple directions for aaeap attractive pieces of copper and brass — Become of the Pioneer “a EprroriAis ._. ne, Sed 82 y Wuen Vatves Get OurorSrep ; By Martin Bunn 84 Enai . Gus, the auto mechanic, tells the secret of efficient timing ngineering Tue “Ten Toousanptn” Toucu . By Henry Simon 94 Highest Dam in the World . 44 Precision hints for the man behind the micrometer § =100-Story Skyscrapers? 47 May, 1929, Vol. 114, No.5. Popular Science Monthly is I a ~ month- United States, its possessions, and Canada, $2.50; foreign countries, $3. The Tag feet pay ACE Ey Die yh nn ge pt New York under the act of March 3, 1879 sdditional entry as seco 8 Popular ee 5 —— does not underwrite the business methods matter at Chicago, Illinois. Entered as second-class matter at the Post Omee of the viduals o prod them. The use of spouer Science Department, Canada. Printed in U. a) A. Copyright. 1929, Ld the Popula Monthly articles A a + schemes is never authorized. Capen, Science Publishing Co., Inc. Single copy, 25 cents. Yearly su sovilieae © to President and Treasurer; R. oe ilson, Vice-President; A. L. Cole, ierdon + —}\
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AY, 1999 —=—- PO OO OOD OOD OD HY Ne “™“SE May, 1929 POPULAR SCIENCE MONTHLY — —————— Drawing Water Power from Scotch Highlands . Newest Oil Locomotive Could Light a Town Power Resta Is Bored through Italian Alps . ‘ Exceptional People A Great Engineer and Adventurer . Makes Coats You Can Wear Either Side Out .. Africa Hunter Brings | "Em Home on Motorcycle . Artist Weaves Portraits from Human Hair . Dare-Devil ‘Fireman Dives 85 Feet into Net. . . Magician of Chemistry Father of the Skyscraper He Makes the Camera Lie Health and onan Men and Microbes Sifting a City’s Smoke No Sterilization by Radio _. Advocates Prohibition of Teeth-De- caying F a Cave Children Had Rickets . Finds Tracing Cloth Acts ‘Health Glass’’. More Lime, Fewer Divorces, De- clares Dietitian .. Skipping Heartbeat Not Always Danger Sign ims Laboratory Discoveries Sugar from Flowers and Medicine from Sugar . — “Cod Liver” Oil Made from Yea Three = Times as Sweet as Sugar. Nature Bringing Dinosaurs to Life . How Insects See Us... Our Best — Stories Are ‘Wrong, Says Expe Trees Fed | of Millions of Micro- scopic Slaves. Frogs Can Learn a Simple Problem in Geometry. . ‘ He Does All the Housework New Devices for the Home Space-Saving Bed Hides in Table Electrie Clipper Trims Hedges . Snips End Off an Egg ; Novel Can Opener. Measuring Kit Serves Many ‘Needs. Locks Windows Open or Shut .. Spot-Remover Set for ee Stains. ; Electricity Dries the Laundry Dishwasher Built into a Faucet. New Floor Polishing Machine A “Suitcase” for Laundry .. Flower Holder Combined with ee eee New Processes and Inventions “Wishbone” Tubes proaching Vessels New Grain Elevator Weighs Car- goes Automatically _.. A Substitute for the Bulky Golf Bag. Detect Ap- . 131 ¥ Golf Club Picks Up the Ball. 59 66 | Helps You Pick a Cinder Out of Your Eye 60 67 | Dual Control for Piano ‘Stops ‘Pu- pil’s Mistakes . 60 70 | Novel Stirrup Clamp Aids in Bat- tery Repairs. . 66 Pens doe. Torch Cuts Steel Like a JigSaw . 66 20 Two Ears Now Can Listen at One Telephone ; : 68 57 New Red Dye from Cactus... 68 Making a Telephone Talk through a a 58 Loudspeaker. . 69 Track Coach Invents New Toe-Hold 59 for Sprinters. 70 Amazing New Fireproof Lumber 68 Promises Safer Homes 73 . 129 . Photography Heartbeats in Movies. 46 Onion’s Light Photographed . 55 44 ‘ . 47 Radio Your Newspaper by Radio . 44 58 | ‘Talk to Byrd from Panama . 59 61 | Trouble-Shooting with Phones . 64 Regeneration and Quality 64 61 | The Right Grid Leak. 64 AB C’s of Radio. . 64 67 | Fugitive Trapped by Long Distance Radio Photo ; 66 71 | Radio Brakemen for Trains . 70 Ships Making Submarines Safer. 45 46 | Mothering a Brood of Twelve Sub- marines . 55 54 | Larger and Faster Liners to Ply the Atlantic. . 68 59 | Extension Davits to Aid in Lifeboat Launching 70 $8 Unusual Facts and Ideas 46 | Strange Bridges the World Over 35 Watering the World’s Crops 36 57 | Urge 24-Hour Clocks 44 How Much Do You Know about 67 Electricity? ; ; 45 Where Our Energy Goes. 45 69 | Mower Harvests Fodder from Sea 70 Bottom . 54 The Air Above Your Home Is Yours Say Experts. . 54 Italy Originator of Ice Cream? . . 54 76 | Blades Cost Shavers $38, 000,000 a 16 Year . 55 76 | Pictures in Wood Etched by Sand . 56 76 | 523 Chrysanthemums Bloom on a : 16 Single Stem... 56 "6 Curious ‘ee House Built t by Nature . 57 77 | Its Front Door Isa Tunnel. . 57 77 | Bullfrog Army to Fight Alaskan 17 Mosquitoes ; 58 77 | “Skinny” Men Smartest, College 77 Tests Show . 58 They’re Taking the Chill Out of Ice 17 Cream 59 Millions of Reptiles Killed for Leather - Ls 59 Curious “Log House” Built of Drainpipes . 60 Trees Worth Millions. 60 Do You Know a “Decibel?” It’s a 54 New Unit . 60 Lights Rout Two Enemies of Fruits 55 and Plants .. 60 59 4 Produces Shapely Pickles 60 ? —— Carpenters Build Church iz 61 Parlor Baseball Played with Tiddle- dywinks ‘ 61 682,308 Bird Immigrants. ‘ 61 Diet of Milk Makes Worms Alluring to Fishes. 67 Demand for Sawdust Fuel Causes a Shortage. 67 Reads Name of Explorer on Mystery Rock 68 Cordon of Petunia Vines Guards Against Fires. 68 A Cupful of This Poison Could Wipe Out a City . 68 College Fania in Pistols and Blood- hounds . 69 — Court 400 Years Old, “Still in 69 Altar 3, 500 Years Old Is Unearthed in Palestine Fit 71 Beebe Angles for Strange Fish with Radium Bait. 72 Cement Helps Put Out Oil Well Fire. 73 Would Blast Arctic Ice to Keep Us All Cool... 73 Tail Lamps for Elephants the Law in Ceylon . 73 Milk > Now Delivered in n Handy Paper Bottles .. 73 “* Average Inventor” Begins ‘His Work at 25 . ‘ 151 Research Two Miles High 5. alee EE A Strange “Death Valley” . . . 160 The Fiddle-Maker’s Secret . . . 162 For the Home Owner Varnishing Your Front Door . 90 Substitute for Garden Hose Washer 102 Renewing Floors Overnight . . . 104 Testing Butterin the Home .._ . 109 Drain for Back Yard. . 118 Repairing Shingled Roofs That Leak 119 Hints for the Mechanic Spiders Set Up Work in Lathe . . 96 How to Make a Small Arbor with Square Shoulder... . 96 Three Ways to Reset a Tailstock . 96 A 1/40,000-Inch Thickness Test with Simple Tools... 96 Old Bill Says—__.. 96 A Finishing Tool for Steel or Bronze 116 Revolving Centers for Pipe in Lathe 116 How to Make an Old Style Tool Post More Rigid . ¢+0 SRB Spark Test for Ground Holes . . 128 Ideas for the Handy Man A Model Plane for Long Flights 80 How to Cast Concrete Seats . . 86 A Dresser for Small Homes . . Drilling Holesin Glass .. 98 How I Built a Portable Workbench for Use ina Small Apartment . 100 These Handkerchiefs Can Fly . . 102 Pins Prevent Bench Drawer from Falling .. 102 Blueprints for Your Home Work- shop. . . . 106 Modernistic Smoking Stand. . 108 Strong Joints Made with Clamp Nails. . 110 Old Gun Converted into Floor Lamp 111 Table Extension Aids in Perspective Drafting 1ll Making an "Interchangeable Screw- driver Set. ‘ 112 Cleaning Oily Shop Floors | . . 112 Striping with Lacquer... .* 114 § Preparing Concrete for Paint . . 114
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! POPULAR SCIENCE MONTHLY JUNE, 1999 WHAT IS NEW THIS MONTH Table of Contents for June LEADING ARTICLES t Automobiles SrraNGEsT AMERICAN SEA Mystery Is Sotvep at Last oc geal Crossing to Unsnarl = By Alfred P. Reck 15 ‘ What happened to the vanished Cyclops y AY — Driveway Safe from Pune- 86 Wuat Is AweEap IN AVIATION ‘ : 18 A Simple Bushing Press . 86 Leaders of the air discuss flying’s wonderful future Broken Glass Extractor . 86 Tue Speepiest Crart AFLOAT . . By Robert E. Martin 20 Filtering Out the Dust = The romantic story of Gar Wood, America’s speed boat king ope Aviation A New Ice Acre May Bury Us . Pt 22 , A startling prophecy of another glacial in invasion New Aerial Ambulance 40 Aviation in High School 40 Mopern Noan’s ArK Ficuts Disease By Henry Morton Robinson 23 Multiple Airport Beacon 40 How animals are helping medical research America’s First ‘‘ Flying Train” Goes Do Insects Tutnk Like Men? . ae By Michel Mol: 25 175 Miles. 40 Amazing intelligence feats of ants and wasps San Francisco “Attacked” from Air! 40 I Am Learnine To BE «a Fiyer—Panrt IV. By Larry Brent 26 American Aviation Doubles ina Year 41 A breath-taking day in the life of a young rookie pilot Nickel-Plate Wings 41 Unper Arctic Ice To THE Poe! 29 _ F light Record 41 Why a daring explorer plans a submarine dash beneath frozen seas ee wl oe ps Loncest Arrway Links AMERICAS . By Alden P. Armagnac 30 Geein-to- Brasil sete 41 How aviation is tapping the riches of a southern continent Airship Ribs Tested P- 50 New CaLenDarR BY 1933—Eastman By Frank Parker Stockbridge 32 1929 Icarus Tries Wings and Hits Why the famous camera maker favors a thirteen-month year Dust. . 54 THE 1929 Power Boat Fizer . . - os 34 New Safety Landing Gear for Planes 56 A pictorial presentation of the latest i in motor craft Weather Mast for Air Line... 56 “I Was Atmost CANNIBAL STEW!” . By Martin Johnson 42 Static Serves as Weather Prophet for An explorer’s thrilling adventures, as told to ‘Fitzhugh Green Flyers. 58 “Da Vinct Dip It First”. By Edwin W. Teale 44 Armo ed Buildings, Subway Cities, How a genius of four centuries ago anticipated modern wonders for Air Defense... 59 KEEPING THE CONGRESSMEN COOL . ; 45 Air Mail Stamp, Music, and Pictures A remarkable solution of a perplexing ventilating problem —All for a Nickel . 64 Tue Fastest THING ON WHEELS . By Arthur A. Stuart 46 An Aerial ' ne That Can A “‘human bullet” sets a new speed record Never Fai : 66 Tue Rea Fatuers of FuicHt . . By John R. McMahon 52 ‘ ‘ Concluding the great story of Wilbur and Orville Wright Eng wreering Harness the Sun for Power . 50 SPECIAL FEATURES — hd — Tunnel Laid in - Cover DESIGN 3 By Herbert Paus Pile Driver Advances over Footing Pinninc Tatts on Donkeys . By Wallace Ames 4 It Builds ; ‘ - Timely and useful financial advice Wuy Some Rapro Sets Cost More By Alexander Senauke 10 Exceptional P People Institute tests reveal what you - for your money ‘Toten dite. . 38 Our Reavers Say— . — ee She’s the World’s Best Woman Back or THE Montn’s News... By Karl Vooght 48 Fencer . . . $8 Illuminating comment on the latest in science Wins Horseshoe Pitching Title 38 Way, “A. C.” Sets Cost Lessto Run. . By John Carr 60 They Hold Men’s and Women’s Fig- An answer to a question that puzzles most radio fans ure-Skating Honors .. 38 How to Kitt Squeats In Your Set By Alfred P. Lane 61 He Can Heave 760 Pounds . 38 An expert’s advice on curing a familiar nuisance Surgeon Is Crack Pistol Shot 38 How To Srart Your House Ricut By Roger B. Whitman 72 Called America’s Lustiest Horn Hints on selecting the best materials and construction methods Blower . - . . 38 Maxine A Famttry Motor Boat... Bu Newcomb Leonarde 6 King of Marble Shooters 38 Plans for a seaworthy power craft that you can build ae Is .* Rifle a ded 38 How To Buttp a Tavern TABLE By Frederick J. Bryant 78 a I anemaeng for making an exact copy of a rare — o Spends . 4 Years Buil ding Inl = id ° ° . . ° ° . ° ° Table Top 64 Do You Know Your CARBURETOR? ao. By Martin Bunn 82 Old Indian Shs Last of Totem Pole Gus and Joe discuss an important part of your car Makers 71 Otp Brit Buys an Arc WELDER . By James Ellis 94 Forty Years a Diver, and Still on A veteran mechanic finds an efficient “putting-on” tool 4 the Job . . B June, 1929, Vol. 114, No. 6. lar Science Mon blished month- United States, its possessions, and Canada, $2.50; foreign countries, $3. The Ng Meutered as second-clas os work maatt ter ‘Des. 28, Tots. at the Post Omer at senting ‘o aos editorial solemns vos ‘shesiae af rm products of applied New York under the act of Mareh 3 3. “Taz: sdditional’ ex entry as seco! a ar Science Mont! does pd underwrite the business met: matter at Catesso, Illinois. Entered as matter at the Post Office of the paittinls ¢ r concerns ucing them. The use of Popular eee Department, C Printed in U. “oA. A. the Popular Monthly articles for stock-selling na hy is never authorized. ‘apen, Science Publishing Co., Inc. Single copy, 25° cents. Yearly su riptions to President and Treasurer; R. C. Wilson, Vice-President; A. L. Cole, Secretary. Jun | Ir
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| — JUNE, 1929 POPULAR SCIENCE MONTHLY ———— —— Health and Hygiene Happy Hunting Grounds for Germs Is Unhap iness . You Can’ . scape a Cold, Medical rts Sa Hundred Di erent Kinds of Colds May Get You Laboratory Discoveries Music by Light! .. “Blectrified Food” Next “Silent Sounds” Used to Analyze Liquids . Silver to Purify Water Nature Eagle a “Model Citizen”. Did Plants Migrate Like Birds A Ago? . 1 Barks Like a ‘Dog—and It Bites, Too! . ee’ Toads Do Not Cause Warts. One-Celled Amoeba Swims by Dis- solving Itself . Scientific Fishing Party Hunts Sea Mammoth . This Tree Has No Enemies and No Diseases . Ages - New Devices for the Home Laundry Pre-Packed in Novel Fold- ing Hamper . Fourteen-Blade Hedge .. : New Electric Foot Warmer. . Now—a Machine That Cools Your Living Room in Summer . ; Prevents Frozen Water Pipes Electric Iron Cord Out of V Way in Wall Reel . Nail Brush Holds Pumice Stone . New Stepladder-Stool . . Dinette Looks Like Door . . Table Stove Bakes, Roasts, Fries, and Toasts .. : Canvas Sling Totes Firewood . Six Freezing Speeds in New Refriger- ator Control. —— Kept Handy i in Bag on Shears _ Trim ‘the Bridge "Table Serves as Fire Screen . New Processes and Inventions Electric Voting Machine to Speed Elections. —. of Cane Carries Cigarette i : ae te An Adjustable Sawhorse. . Divides Inch into Millionths A Handy Golf Ball Holder... Sharpens Two-Edge Blades in the Safety Razor . Stencil "Maskine Paints Designs on Walls 1 57 66 51 59 64 65 48 55 58 65 67 68 69 74 74 74 74 74 74 75 75 75 75 75 75 75 75 54 55 64 65 65 66 a 66 4 - Her Ring a Vanity Case... 67 ¥ Machine Signs 7,500 Checks an Hour 69 Novel Barometer Flashes Warning of eee New Cedar Plaster Fights Moths 71 Photography The War Against Smoke .. 51 New Device Makes “Stills”’ fro Home Movies = 4 ‘ 68 Radio Radio Speeds Ship Repair 58 When the Storage Battery Dies 63 Bringing Out Low Notes 63 Imitation Static 63 Two Tones at Once 63 ABC's of Radio. . 63 They Turn on the Radio to Predict Weather. . 66 “Shut Up!” He | ‘ommands, and Radio Set Stops « » Ships How Much Do You Know About Ships? . 51 “Ghost Warship” Rigged as “Target for Big Guns 58 Luckiest Submarine, S-48, Survives Two Mishaps 58 Floating Deck to Save LivesatSea . 70 Navigation —— = Pocket- Sized Table _.. 70 Unusual Facts and Ideas Curious Towers Bent by Time . 39 Towers of Mystery ‘ 48 The New Paper Money . 48 Back tothe Flood . 49 Gems Live and Die 49 Our Faces from Fishes. 51 Novel Silo Built of Wire Fence and Roofing . . . 54 Women Inventors Busy | on House- hold Improvements. 54 Mechanical Leader “Cools Out” Race Horses. 55 Our Roving Eyes Move 100 Times a Minute . 55 How Much Is a Billion? It Depends on Where You Are. 55 Collapsing Bridge Buries Crowded Motor Bus_. 56 Scientist Links Early Man to Garden of Eden . 57 Water Heated Electrically. While You Sleep. 57 Huge “Whales” of Lumber Make 1,200-Mile Trip .... . 857 Composer’ s Portable Piano No Larger Than Trunk 57 Portuguese Mines Promise New Radium Supplies. 59 “Silk” Gowns of Asbestos May Be- come the Style . 65 Ice Jam Defies Thousand Pounds of Dynamite : 65 Saves Labor on Ironing Day 65 Wanted—a a Style of Hand- writing 66 4% Chestnut Blight Hits Tanning In- ae. .: + eee New Tests Pick the Best Man for the Job. 67 Ages Wine by Electricity i in a Few Hours. 67 Machine Counts Audience in Ticketless Theater : 68 How Fingerprints Can Be Counter- feited 68 How Jewelers “Set the Stage” for Diamonds . 69 Radium Used to Prevent Rubber Factory Fires. 69 Huge ‘ “Electric Hen” Will Hatch 20,000 Chicks . 71 Indoor War Game Demands Skill of aGeneral . 71 Unearths Mastodon Bones Near San Francisco : 71 For the Home Owner House Plants Thrive on Soap Baths 64 Sinall Pieces of Ice Keep a Refriger- ator Colder .. lige Kalsomine Stippled Walls . 102 Caring for Garden Hose. . 108 Taking Match Scratches off Wood- work . 112 Friction Tape Leashes Upholstery Springs . 112 Silencing a Screen Door with Rubber Bumper . : . 117 Hints for the Mechanic How Wood Aids the Machinist . 96 White Lead asa Lubricant .. 96 When to Use Old and New “Mikes” 96 The Fine Points of Oiling .. 96 Watch the Milling Cutter’s Heel 96 Headstock Center Locates Work 96 Indicator Sets Angle Plate : 96 Go Slow with a Portable Grinder 96 Ideas for the Handy Man Constructing a Piano Bench 79 Building an Electric Motor . 84 Latest Racing Yacht Model 88 Fancywork for Your Lathe . 98 Keeping a Shipshape Shop . ._.. 104 Bench Built from Popular Science Blueprint . . . . 104 Sharpening Your Auger Bits . 106 Magic with a Bit of Rope. 108 Blueprints for Your Home Work- Shop. . 111 Removing Oil from Oilstone . 112 Resoftening Hard Rubber . . . 112 How to Wash Rubber Articles . . 112 An Ink for Writing on Glass . 112 To Dissolve Salts Quickly. . 112 Safety First with Volatile Y solvents . 112 br | Beeswax Purity . ae A Stool to Please Any Small Child . 113 Sealing Varnish Cans 115 Waterproof Envelope Made from Old Inner Tube . 117 Realistic Wooden ‘Revolver Shoots Rubber Bands . 121 Hundreds of Striking Articles in This Single Issue ~ Cover from Every Angle the Latest Developments in the World of Invention and Discovery