Popular Science Monthly 1930: Vol 117 Table of Contents

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POPULAR SCIENCE MONTHLY Table of Contents Volume 117 July to December 1930 OEE i LLIN I EIS Brin on gr ae CE enti wen en en) — 1

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25 Cents a Copy $2.50 a Year S opular Ge ience MONTHLY funded 1872 381 Fourth Avenue New York, N. Y. Table of Contents for July, 1930 LEADING ARTICLES 7 Automobiles Crooks Cured by Surgeon’s Knife .By H. H. Dunn 19 Sliding Floor for Trucks . . 35 Are criminals the victims of their glands? Auto Trunk Suits Shopper or Tourist. 36 Talk, Hear, See on This Phone . Drawing by B. G. Seielstad 22 Powder, Left from War, Lacquers How the new two-way television works YourCar. . . 36 Jumping from the Sky . , . By Buddy Bushmeyer 23 What parachute leaps taught a man who has fallen 100 miles Aviation “Plant Pill,”’ Used in Big Fields, Gives Giant Yield to Farmers 26 Flying Boats to Fight Fires . . 47 Novel food capsules pass their first large-scale tests Hospital on —- 52 Strange Dreams Made to Order . . By David Ballin Klein 27 oe — P = ute That Sus- 53 A psychologist tells why you “fall” in your sleep Overshoes for Plane Lessen Ice Why Your Fireworks Flash and Go Boom. By Alden P. Armagnac 38 Linde Cheeses Mow Coates. = Mysteries of the Fourth of July thrillers explained Coast Route. 53 World’s History in One Picture . . By George M. Richards 40 jg Saree soy Glider i in Crose- 54. A graphic chart of civilization’s ups and downs _ Croydon Installs Neon-Lighted F Weather Vane. 54 New Ways of Probing Old Earth for Gold .By Arthur Chapman 41 “Diving Bomber” Adds New Ter- How modern prospectors search for mineral riches ror to War 54 . l Genius Crushed by Patent Laws . . By Robert E. Martin 43 —_ Ene Trips iy Europe 54 Just what good is a patent, anyway? Coffee Grinder Radio Dial for . l : Millions Use New Covered Wagon - By Michel Mok 56 Makes W ‘hirling Propellers Stand th High-powered buses set a new style in travel Still . 55 i N Me ees Picking a Gliding Site. By Edwin W. Teale 58 New Light Air lane 3 — Jigs . 35 What it takes to make a good place to soar Turntables for Airplanes . . . 55 A Ten-Mile Storage Battery . eae 5: iin 60 How a unique Connecticut reservoir keeps aueglen 3 power on tap En gineerin g New Ways to Cure Radio Fading. - By Alfred P. Lane 71 Columbia River Bridge Span Sets What to do when the stations die out Two Records. . 45 Putting a Radic in Your Car .By John Carr 72 Shi Pree Generate Power for i Now you can enjoy programs on the road Electric Trains Run with No You Can’t Save Gas with Gadgets. . . «By Martin Bunn 74 Pe ed —— Shaft Built in 51 Gus and Joe explain why nothing takes the place of. fuel Germany ae es _ 62 FEATURES AND DEPARTMENTS Health and Hygiene Cover Design . By Herbert Paus Young Doctor’s Robot ne Financial Article . . 4 Bell at Error . 30 Tiny Electric Bullets Kill Fero- Popular Science Institute Pose 12 deta Geen . 31 Our Readers Say— . 14 Your Age Depends on Colds New Ideas and Inventions 29 You've Had . 32 i Woman Breathes— Only Three Progress and Discovery 45 Times a Minute... 33 Popular Science Scrapbook . 61 Finds Germs Shrink So They Inventions to Lighten Your Household Ghats 68 Can't Be Seen __ . : 36 Powerful Drugs F: ound in Venom Editorials . . 70 of Toad . 51 Helpful Hints for Radio Sie’ : 73 P. rot s Blood Ends Measles in 63 Re The Home Workshop. % Sunlight Keeps Candy Free from Novel Kinks to Use on a Car 84 yg Germs... 66 Bek Ah ita AT Labapaansctengs Mowe gamlanes monte sete ot hs mart mg nt be ernie ta crane ator Entered as seeond 28, 1918 nat the Post Office at turn of such material or insure against its loss. In presenting numerous stories New York under the act of Bre 3, 1879; additional entry as second-class of new products of applied science, Popular Science Monthly does not under- matter at Chicago, Illinois. Entered as second-class matter at the Post Office write the business methods of the individuals or concerns producing them. The Deparcment,, a. Printed in. 8. A, Copyright, as ‘subgertptions to pm AB eat Science Monthly articles for oe tae Ing schemes is never United States, its possessions, and Canada, $2.50: foreign countries, $3. The dent: A. L. Cole, P vice Prtckdent anh aa ee ree

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Popular Science Monthly for July, 1930

Laboratory Discoveries Quartz Crystal Most Accurate of ocks. Effects on Life of Unseen Rays I Is Studied at Berlin ; Models Eight-Foot Graf Zep Flies 1,800 iles . An Easy-to-Build Model of the DO-X . Maker. Our Covered Wagon Model. Give Your Model Plane the e Right Propeller . A Choice of ‘Ships for the Model New Devices for the Home Clothes Hamper Has Compartment for Silks . ‘ Drip Coffee from One-Cup Device Label for Milk Bottle Shows Day It Came . Radiant Heater Cooks Meat at Table . Toaster Turns Itself Off and Ejects Toast. Fork Passes the Toast and Drops It on Plate Cleans Mop and Holds the Dust. Cooks Three-Course Dinner on One Burner ek New Knife Sharpener ._ . Clothes Rack in Kitchen Stool Four-Adjustment Meat Chopper. Toothed-Ridge Dustpan Cleans the Broom. . Rubber Tray Makes Removing Ice Cubes Easy ‘ mie Spoon and Grater i in One Special New Processes and Inventions Railroad, Ties and All, Laid by New Machine. ‘ Flashlight in Powder Compact P New Refrigerator Gas May Cool Tropic Homes _. ‘ New eral Motor Runs Bicycle ‘ Blind Man Could Work New Electric Plu % aratus through Neck. Nine-Mile Gun Shoots 800 Times a Minute . Secret Liquid Bathes High Volt- age Switch . Spring Clamp on Light Fastens Anywhere. Machine Mimics Glow of Fire- place . ; Sammetniina New in Pipes . Lighter on Cigarette Case. Hold-Fast Nut Lock . New Hat for Women Holds Key and Powder Puff. . A Book for Your Lunch ‘ Pipe Lighter Won’t Blow Out No Cables in This Elevator .. . Boat Rolls Along at 80 Miles an Hour . With Motor on Back, ‘Hard Jobs Are Easy . . Mirrors Guide Golfer’s ‘Swing. New Air Torpedo Has No Crew . akes Deaf Hear 45 51 66 76 80 86 68 68 68 68 68 68 69 69 69 69 69 69 69 29 30 30 31 31 32 33 33 33 34 34 34 35 35 35 36 37 37 50 4% t

Photography Meter Measures Movie Light. A Tiny Movie Projector . . Flashlight Gun Makes Night Snapshots. . “are ek Air Photos Made by Army Pigeons. Re 6,000,000 Candlepower " Movie Wight. . . é Radio saeer of Future May Go ad Radio Yardstick Keeps Tab on 600 Stations . Static Forecasts May Help Radio Fans . ie Test High Power Radio 30 34 16 49 67 16 52 66 67 Unusual Facts and Ideas Germs Used to Improve Swiss Cheese Flavor. . — Baffled by ‘Todine in ain . May Produce Wool Without Sheep Helium Now Cheap Gas . Frozen Meat Now Sold in Car- tons. Polar Reports Wanted to Guide Weather Man _. Bacteria Blamed for Strange Farm Fires. Italy Now in Race for World’s Finest Ship . Chart Teaches You to Dance. Making Great Bricks . Australian Lake Looks Like Lake But Isn’t . Tanbark Padding Makes Football Field Safe. . Mind Must Be Worked to Keep It Keen . Low Voltage Current May Cause Death , Test Pencils in Search for Long Lasting Lead ___.. Better Tires Is Aim of Tests Made on Rubber... Two New Alloys Harden Copper. Whole History of World to Be Seen in Museum __.. : Oil Solidified by Liquid ae Varnished Auto Plates Fade Out Quickl ; London Tries to Divert Traffic to River Taxis Giant Telescope Mirror Made in Great Heat ; How Pictures, Ruined by Time, Are Saved by New Art... - * Fired ae Steel to Clean t Machine to Read Is Inventor's Goal . Black Light Detects Forgery in Checks Smoke Masks of 1664 and 1930 Com ared > ; “World” Phone Book Out in Denmark... America’s Cup Defender Gets 168-Foot Mast. Lipton’s New Shamrock Small but May Be Fast _. $10,000,000 Cruiser Is New Flag- shi ‘ Old Mosaic Art on New Chimneys Girl Asks Congress to Protect Her Designs ; : 29 29 30 30 31 31 31 32 34 35 36 37 37 37 16 16 16 47 47 47 47 47 48 50 50 50 51 51 61 62 62 63 63 4 a

¢% Find Million-Year-Old Track of Giant Beast . Strange F riendships Among Ani- mals. Just Like Their ‘Ancestors. Pulpit Serves as Tool Box... Proposed _New_ Calendar Is 4,000 ears Old... German Public Gets Art Works Chea Paris oncert ‘Hall Has Giant Pipe Organ. Sound Film Is Used ‘to ‘Record Contract , Why Gold Rings Stain the Skin . Ultra-Violet Lamps May Abolish Windows... Tom Thumb Opossum Found in Argentina 63 64 65 67 67 67 67 For the Home Owner Blotting Paper Holder Dries Razor Blades Repairing Linoleum So the Patches o Not Show ‘ How to Remove a Stamp from an Envelope . Hints on Building Shelves and Bookcases. Repairing a _ Composition Single oof . Craftwork How to -Finish Furniture . foterde ft t Simplified Woodworking Building Garden Seats of Wood . A Pergola Is Easy to Build A Rarity Among Tables You Can Slide Big reign From This Rack 110 . iil 112 113 77 . 106 75 82 . 100 110 Ideas for the Handy Man Ways to Straighten Cupper Boards Foot Controlled Bench Lathe _. Swimmer’s Ladder Made from Tire Chains . Polishing Head Used as Small Lathe . Carbon Holder for Ray Experi- ments . Setting Up a ; Substantial Canvas Cottage. Blueprints for Your Home Work- shop. ay A New Way of Dyeing Setting a Hard Saw _. Marking Buoy Made from Old Bard Can. . Fish Stringer Made from Dis- carded Toothbrushes .. Repairing a Broken Band Saw Blade cod a Painting Absorbent Woods .— | Forging a Hunting Knife from an Old File. Two Puzzles That Look Easy Easily Constructed Balance for the Home Laboratory _. How to Make a Set’ of Marine Curves 78 90 95 95 99 102 . 103 . 105 107 108 108 109 109 . 116 - LF 118 118 Hints for the Mechanic Threading Facts for Shop Men _ . How to Make a ~~ Collet Adapter 92 malaika ¥ <7 rt ; he | 3% m — x . « eile , are ae 2 mee et i RN a a

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25 Cents a Copy $2.50 a Year Sdience Table of Contents for August, 1930 LEADING ARTICLES Mystery Cell Aids Television Startling new developments in the art of seeing by radio Thrills of Flying Six-Ton Planes How it feels to pilot the “big boys” Froth Smothers Bigge. st Oil Blaze ; The story of chemical fire-fighting’s greatest ¢ triumph Dove Is Now Night Bird of War Army’s carrier pigeons taught to fly in darkness New Pipe Lines Point to Gas Heating Era . By Alden P. Armagnac How cheap fuel from wells offers new luxuries to homes Sugar Will Give You Endurance Surprising new facts about diet revealed by tests of athletes - Bowlus Teaches Me How to Glide What happened when a veteran flyer tried a motorless plane What Europe Can Teach Us About Patents . By Edward Thomas A lawyer comments on the shortcomings of our system How Engineers Crowned the World’s Tallest Building . . Drawing by B. GC. Seielstad Putting a spire on the Chrysler tower explained in pictures The Talking Newspaper . How they make sound ne ends Splicing a Cable in Mid-Atlantic . By Burt M. McConnell Exciting moments of the ocean linesmen, told by an eye-witness Universe Whirls on Plaster Sky Marvels of America’s first planetarium Headphones for Modern Sets Why earpieces are still in style Don’t Buy Radio Tubes by Looks Timely advice in judging the worth of equipment Gus and Joe Are Real Live Men An answer to readers’ queries about the Model Garage pair FEATURES AND DEPARTMENTS Cover Design Financial Article es Popular Science Institute Page .:. Our Readers Say— ... .¢ New Ideas and Inventions Progress and Discovery Popular Science Scrapbook Fifteen New Ideas for the Housewife Editorials Helpful Hints for Radio Sine The Home Workshop : Hints for Men Who Work on a August, 1930, Vol. 117, No. 2. Fvoutes Science Monthly Is published month- ty at 381 Fourth Avenue, New York, Y., by the Popular Science Publishing Ine. Entered as second-class “LR. Dec. 28, 1918, at the Post Office at New York under the act of March 3,, 1879; additional entry as second-class matter at Chicago, Illinois. Entered as aqgeak-enee matter at the Post Office partment, Canada. Printed in U. 8. A. C opyright, 1930, by Science Publishing Co., Inc. Single copy, 25 cents. Yearly subscriptions to United States, its possessions, and Canada, $2.50; foreign countries, $3. The op ular 381 Fourth Avenue New York, N. Y. MONTHLY unded 1872 Automobiles _ By Robert E. Martin 15 Liquid Oxygen Runs Amazing ; Auto . 25 ar for Auto Jack Helps Tire By Randy Enslow 18 hangers . 27 y . Rapid- Fire Guns on Fast Cars 30 Axle Wedge Stops ene tees 84 20 Repairing Brakes 84 Rim Spreader 84 Unmatched Doors . 84 By John E. Lodge 21 Two Locks for Doors 84 ; Auto-Camping Trailer Built for Less Than $25 . 100 23 Aviation By James W. Booth 35 Army Plane Sends Map by Radio 49 y J Amphibians Climb Button Land- ng f Fl In d by “4 Pane Devices for ers Inv ente ~~ imran os Students W a Can’t Fl ” 50 Plane Flies Mail from Paris to 39 Buenos Aires ; 50 Falling Leaf Stunt Is ‘Done Up- side. Down ‘ 51 Glider, without Wings, Soars on 52 Fuselage . 51 Crude Oil Smoke Gives Pilots Wind Direction , 51 By Michel Mok 53 120 to Fly in Giant Plane 51 - Engineering Longest Tunnel in East Taps Japan’ s Oil Field 42 58 Two-Way Phone Service Installed on Trains ; 43 England Digs Biggest “Under- By Alfred P. Lane 67 water Tunnel... . . 43 Sittten 0 Health and Hygiene ' Electric Eye Guards against Sun- burn . 30 : By Martin Bunn 70 Serums Fight 20 New Kinds of : Pneumonia , 31 Fever Made to Order with Radio Waves : 32 “Tron Doctor” Used to Cure Div- er’s Bends 33 . By Herbert Paus Gas Victim Saved by “Automatic 4 Machine i 33 Mineral Waters Used to Cure 10 Snake Bite 42 12 First Pictures of Pasteur Insti- 95 tute 44 4 Bitter Medicines Hidden i in Food . 59 59 Laboratory Discoveries 64 Man-Made Lightning Gets Power 66 Facts . 41 68 Study Cell Whirling under Micro- scope 42 71 Electric Laws Upset by Strongest 84 Magnet contents of this magazine must not be reprinted without permission. The editors are not ——e for unsolicited contributions, and cannot guarantee the re- turn of suc aterial or insure against its loss. In presenting numerous stories of Dew products of applied science, Popular Science Mouthly does not under- write the business methods of the individuals or concerns ——_ them. The use of Po — ee Monthly articles for es ng schemes is never authoriz Capen, President and Treasurer; . Wilson, Vice-Presi- dent; A. L. “Cole” Vice-President and Secretary.

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Popular Science Monthly for August, 1930 . ios oe Seep gee arpa pee a eS Models Historie Scenes Models : How to Put Ship i ina Bottle re True-Pitch Propellers for Model Airplanes . Whittling a Model Shown in Fine Bowlus_ Sailplane e eee. Sa ee $100 in Prizes for Bottle Models . New Devices for the Home Receptacle for Kettle Covers . ~— Clamp Holds Baking Dish i Ironing Board Swings Out of Way New Automatic Foaster_. Wire Sash Guards Children from Open Window : Versatile Sandwich Toaster An All-Metal Scouring Brush. Rubber Vases Change Shape . New Type Radiator Uses Fan Combination Pepper and Salt Shaker. ae ; Novel Tie Rack. Heater Plug Cooks Eges, ‘Warms Hot Water Bag . Complete Laundry in One Ma- chine . ‘ Hold Bath Towel Firmly : Combination Cooking Appliance _ New Processes and Inventions Nonmelting Ice Gives Skaters Bemg Seem. '. . Electric Violin Plays without Sound Box ro Gage r Saawer A against Manhole “xplosions Machine Writes Ad in Clear Wa- ter ‘ ‘ Pats Rouge o on Electrically : Table Keeps Cards from Blowing Away . . Gun That Shoots Tacks Prevents Eyestrain for Drafts- men ‘ This Clock Talks English . Silent Vacuum Cleaner. Will It Tame Wild Pitcher? False Ears for the Deaf ‘ Photo and Message on Phono- graph Post Card ; Pencil and Knife in New Device New Diving Bell for Quarter- Mile Descent. Summer Days at Will, with New Weather Maker... German Robot Stamps Turf Bet- ter Than Men _.. . Two-Eyed Microscope Spots False Pearls New Eyeglasses Go Inside the Lids Mechanical Band May Oust Army Musicians. Planets on Umbrella Make Astron- omy Easy . Cap and Mask in One Protects Diver's Eyes . : os Photography Meter Measures nope for asain rapher 60 71 99 64 64 64 64 64 64 64 64 65 65 65 65 65 65 26 4 b r Machine Handles Movie Film Home Movie Cabinet . Soundproof Camera Wheels. Make Talking Movie of Latest Eclipse Rolls on Radio No Men in Radio Operated Tank . Radio —_ Up Plant Growth Radio Makes State One Police Station ° Changing Voltage Ruins het tion Transformer Repairs Short Circuit Tests. A B C’s of Radio Unusual Facts and Ideas Steel Floors May Lead to Homes of Steel... . Red Windows Stop Flies SP Kg Metal Rams Aid Search for Pre- historic Relics. Marble Fakes Exposed by Ultra- Violet Rays . Seek Way to Lessen ‘Summer Sun’: 8 Heat Sulphur Aids and Ends Growth of Animals. Find Unexploded Telephone Device Vacuum Furnace Boosts Output of Uranium . Predicts Moon Flight i in 1 Hydroger n Rocket Thought Easiest of All Work Seek Metal Ten Times or than Steel 2 Three New Ways to Find Flaws in Welded Steel Cotton Hull Won't Fatten ; Steel Houses in France Have Met- al Furniture . New Trolley Cars Run 60 Miles an Hour , Swinging Stage Used to Make Giant Map 400-Pound Rail Joints. Neckties of Rubber Look Like Silkk . Heart of Far North Se en in Rare Photos Clean Railway Car in Kettle : Sits in a Cabinet for Soundproof Tests . Helium Keeps Foods Fresh for Months Beehives or Bathtubs from Pal- metto Koots . Process Found to C an ‘New Irish Potatoes . New Welding Gas Made by E lec- tricity Lifeboat with Diesel Engine De- fies Panic... Tenderness of Meat Ge ts Accurate Test R New York Has the Only Se shool for Stone Cutters ‘Bombs with Sugar Is Sweet, ‘eight Tests Welded ‘Huge Sip ped Booze Gives a ‘Swifter ick 36-Foot Press Makes» Truck Frames . ee 29 1 29 31 48 31 47 62 68 68 68 68 26 26 27 27 27 30 30 31 31 33 33 34 59 59 r Masts for America’s Cup Defenders 62 5,900 Theaters Will Show eens. Films... 63 Uses Periscope in 1 Sketching Fish . 63 Hailstones Last a Year . . . 63 For the Home Qwner Easy-to-Build Garden Trellises . 92 Hints on Making — Vevieties of Shelving . . 93 Building a Bookcase . . . . 93 Cleaning Razor Strops __. . 98 How to Stir Paint Before Using . 106 Filling Cracks with Putt 106 The Right Way to Hold a Paint Brush . . 106 Covering the Unused Paint Can . 106 Painting the Clapboards . 106 Caring for Brushes 4 Soldering Leaks in Pans oe Craftwork A Fairy-Tale Chair Amuses Chil- dren. 89 Can You Fit These Blocks To- gether? 98 Providing Your Hunting Knife with a Durable Sheath . 102 Woodworking Machine Sawin Blueprints for from on ~- ‘ 74 ork- ‘our Home shop. . 103 Folding Drying Rack for Emer- gency Use Indoors . 107 Ideas for the Handy Man Testing Your Fund of betinae: ta, Facts . 75 Packing-Case » Camp Furniture . 76 ‘ New Hinges Require no Mortising 85 A Rustic Rock Pool for Your Garden.. . 86 How to Write on Glass. 87 Increasing the Comforts of Camp- ing with an Air Bed er Drying Tacky Paint . . . . 99 Removing Old Finish ._. 101 Easily Made Container for Blue- print Pa . 102 Making a ioe for Boys . 104 Hints for the Mechanic Pointers on ite and Drilling Sheet Metal . 80 Close-Limit Gaging on Milling Machines . 88 Surface Plate for Small Work . 88 Drill and Ream at One Setting . 88 Remo e Metal before Milling . 88 Discarded Phonograph Needles Make Ideal Scribers ‘ 83 Powdered Rosin Keeps Belt from Slipping. . ow! Generating a True Taper , . 88 62 4 Regulating Oil Feed on Bearings . 88 Lig cc Soa 2a RETR ME ETA ener RMA No sine ta > ~ P — TARR NEN OG RTT OTR ce IT OE —— —— TC a 2 i sige * tel 3 = > GS ounem 6A ca APRS REET BOYLE TE PRAT SOS. os freudinneianmareusiiase

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opular Science MONTHLY founded 1872 25 Cents a Copy $2.50 a Year Pop 381 Fourth Avenue New York, N. Y. Table of Contents for September, 1930 LEADING ARTICLES Test Light Speed in Mile Long Vacuum Tube. . By H.H. Dunn 17 Why scientists have built a mile-long test tube Radio City To Cost $250,000,000 . Drawing by B. G. Seielstad 19 Wonders of a new world center for education and entertainment New Plane May Fly Straight Upin Air . . . By Edwin W. Teale 20 What a new kind of heli icopter may mean to aviation Secrets of Sleep Revealed by the ye By H. M. Johnson and G. E. Wiegand 22 You rest best when you toss and reo Lone Eagles of War Banished by Mass Flying By Lieut. H. B. Miller 24 Why aerial squadrons are the modern battle weapons Quick-Erozen Foods Exactly Like Fresh By John Chapman Hilder 26. How a revolutionary process puts new delicacies on grocery shelves eae Made My Flying Better . . . By Assen Jordanoff 36 a mous aviator tells of his thrills in motorless soaring Taking Golf Swing Apart Shows Left Side Does It By Alex J. Morrison 38 An expert reveals the secrets of a popular game A Great New “‘What’s Wrong’? Contest . ........ 4 $1,000 a month in cash prizes How to Get an Air-Tight Patent. . . . By Edward Thomas 41 Valuable hints for inventors from an experienced lawyer Pork Chops from the Sea . By John E. Lodge 54 Hunting the fierce swordfish, “wild hog” ‘of the ocean Man’s Greatest Ups and Downs __.. . © A graphic picture visualizes latest records of air, sea, and earth Learn Your Flying Young! . . By Randy Enslow 64 Lindbergh’s barnstorming partner ‘tells why to start early Why Loudspeaker Foils Experts. . By Alfred P. Lane 69 How draperies and even walls alter a 1 set’s tone How to Obtain Sharp Tuning in Your Set . . . By John Carr 71 Expert advice on making adjustments for selectivity Dumb Drivers Cause Most Accidents . . . . By Martin Bunn 72 Gus and Joe recall mishaps where the car was not to blame FEATURES AND DEPARTMENTS EE ee ea ee ee EE Se ae oe a rr i Se ee ete eft 2 IS Em Nee ee OR re ee ee er a ee ee eee Progress and Discovery 43 Popular Science Scrapbook . 57 New Ideas of Interest to Homemakers 66 Editorials 68 The Home Wickshep ME eS) aa Helpful Hints for Auto Cedhate ena a ee er Astronomy Remote Stars Travel 7,200 Miles a Second Tiny Wires Measure Heat of Stars New Planet Swinging Nearer the es si tie. oe Automobiles Lighted Strip in Road Stops a ish Cars . This Motor F uel Defies W eather . Turn of Key Operates Automatic Car Jack... Auto’s Weight Used to Open Garage Door . Noise of” T: raffic, Works Stop-Lights Helmets for Auto Racers . Biggest Speedometer Automat for Gasoline . Auto Rescues Swimmers . No Need to Crawl under This Car ~— Car Built by Twelve-Year- r , Auto Dare-Devils Race and Talk . Tool Box under Hood or en to Dash .. ‘ Magnet Tests Bearings Fender Aprons. . Speed Easy to Read Aviation Biggest Glider to Seek New Record Planes Launched by Dirigible . Land Tugboats for Airships Outboard Motor Powers Airplane New A. gal Plugs Help Endurance Fili Glider an and Pilot Must Get License Hereafter . Death Plays Tag with Airmen— and Loses Glider Shot into Air by Launching Machine . Human Flying Squirrel Zooms through | ; F er ar Cc = for the Novice . Balloon Guides Fog Bound Pilot . Troop Trains of Sky to Fight Next War . Dry Ice Dust, Scattered by Plane, rings Rain Seaiteniitien Biggest Canal Lock Opened in folland . Canal Ship Raised 118 Feet in Five Minutes Two-Mile Bridge Now Spans Mississippi Health and Hygiene Vaccine May End Common Colds Rats Find nee | in Cotton- seed : cee wee 33. 50 29 43 47 47 49 Septem Der,1930,Vol. 117,No. 3. ier gees p Reeaeeey is published month- contents of this magazine must not be reprinted without permission. The editors iy at 381 Fourth Avenue, New Yor he eee Science Publishing are not Lee pm for unsolicited contributions, and cannot guarantee the re- , Inc. Entered as second-class 3.4 er = bee" 28, 1918, at the Post Office at _ turn of suc aterial or insure against its loss. In precones. numerous stories New York under the act of March 3, 1879; additional entry as second-class of new products of applied science, Popular Science Monthly does not under- matter at Chicago, Illinois. Entered as second-class ag at = hung & he write the business methods of the individuals or concerns sellin — them. The Department, Canada. Printed in U. 8. A. Copyright, 1 Science Pub! biishing Co., Inc. Single copy 25 cents. Yearly i eukesipiie to to authori use of Bang Science Monthly articles for ne United States, its possessions, on Canada, $2.50; foreign countries, $3. The dent; A. L. Cole, Vice-President and Secretary. me schemes is never Capen, President and Treasurer; R. ilson, Vice-Presi-

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EE TS POLLS ES, ON Suiiatar Stanko cx stale Se RSCNM eee SE 4 ‘ La manbubisn endear ees Popular Science Monthly for September, 1930 Models 7 A Queen’s Sedan Chair Model . 73 A Stagecoach Model Built from Our Blueprints ei Lace Paper Decorates Ship Models 97 Whittling a Flying Wing Model . 102 Hints on Model Meets . . . 104 Midget Rise-Off-Ground Plane Made of Writing Paper i ts Jig Speeds Up ete of arate eadeyes. . lll New Devices for the Home A Holder for Your Cleanser Can . 66 Cranks Out Noodles by the Yard. 66 Keeps Milk Bottle Cap in Place . 66 These Lamps Fit on Your Bridge Table . 66 Warming Cabinet Built into Radiator . . bs ek An Illuminated Book Stand - . 66 Makes Pitcher Out of Milk Can. 66 Shock Absorbers for the Radio . 66 Kitchen Shelf Conceals Clothes Rack ... 66 These Vacuum-Cleaner Dust Bags Can Be Thrown Away . . . 67 Novel Egg Beater. . . . . 67 Corn Grater Fits on Pan. . 67 ae a the Gas from Blowing Out. 67 Wicker Seat and Clothes I ~~ Combined : 67 Window Ventilator Rolls Up . . 67 Necktie Rack Folds into Small Space . 67 Tiny Sharpener Puts Edge on Razor Blades... 67 New Processes and Inventions Powered Diving Bell Crawls on Sea’s Floor . 28 a Whistle Fried on En; ine 28 New La oa Angle Drive Is a satile ; 29 Blowtorch Light Pierces Fog. . 29 Two-Ended Point Made Fog. : oe ee: Code Whistle Reveals Ship’s Course in Fog 31 Chairs, Made to Slide ‘Together, Store Easily . 31 Vacuum Street Cleaner Scatters No Dust... -” en ar ee Novel Hook Fights Fires. . . 34 Handy Bridge Table oe New Movie Mike . . .. . 35 Phone Book Index. . . . . 35 Cops SeeBehind Them . . 35 Wood Blocks Test Oiliness of Oil 49 Photography Movie Photos by Automatic Cam- era ; 31 Can Doveiep This Film in See Gem... 32 Picture from hay Level oe A Talking Camera. . 35 Invisible Molecules Caught by Camera .. 46 Birds Snapped from Tent . op TBS Radio “Owl” Switch Stops Radio . . 30 Amateur Treasure Finder. . 34 Hertz Institute Will Seek Radio Secrets. =n 47 Watch Your Radio Diet i 50 Radio May Be Used to Speed Up Brain. . 63 Here’s an Eas Way to Learn Radio Slee ly oe bee ABC’sof Radio , , . . . 7 Unusual Facts and Ideas Chicago Molds Mask of Crooks . 29 Benzine Product May Rival Steam for Heat . 30 Picture on Check May Prevent Forgery : 30 Plan ouble-Deck ie 30 Jelly Goblets Are Now Fit for able Use. 31 Plowing Ground Ends Kansas Mirages . 43 New Sheet Steel Process. . . 44 Giant Locomotive on Rollers . AA Streamlined Engine Built for Speed . : 45 Tiny Boats Fight Fires. 45 Water Tower for Skyscraper Fires 45 To Dive for North Pole .. 45 =. Ray Gives Racer’s Exact 46 Mexicans Build 35-Mile Road in a Day 46 Amplifier Catches Roar of Ant =. 46 Whirling Lens Used to Grade Farm Products by Color .. 47 Use Fringes of Light to Gage Plant Growth 48 No Odor Found That Stops Mos- quitoes 18 Machine Traps Liar by Heart- beat. 48 Railway Dining Car Real Re- frigerator. . 49 New Process Extracts Radium in One Month .. 49 Gigantic Sugar Cane Grown in Florida ; 49 Why Segrave’s ‘Racer Set New Speed Mark . 50 Boat with Glass Bottom Can Crawl . 50 Finds Many Wild Weeds Make Excellent Food 57 English Tower Tells Time, Heat, W ‘eather 58 Fifty Words, Average Phone Vo- eabulary . : 58 Expect 00-Mile Trains 58 Some Caucasian Silver Tarnishes to Gold 59 Statue Doctor Has 1,000 Patients 59 be Real Tennis at Sea . 59 ou See Tornado, Get in Car— “ Steponlt . 59 New Weapons Found for Locust - War Fast TF. cotwork Aids Toiler in Orient. 61 Movie Gets World’s Biggest Mural 62 Women’s Noisy Dresses Help Public Speakers . 62 Big Thyroid Gives Booze Quick Kick 62 Whale’s Picture Made at Byrd’s Polar Camp . 62 Your Eyes Are Fooled by Phan- tom Building . . 63 - j + Population of World over Two illion . Seeks Region Where e Lightning Is a 2 Severe For the Home Owner Can Opener Cuts Steel Leaders and Gutters . Knife Point Guard for Cutting Linoleum... Moth “Gun” Used for Spraying Paint . 102 Soldering Iron Softens Old Putty for Removal 102 Upholstery Repairs ‘for Beginners 112 Opening Fruit Jars... ’ Bottle Themner Attached to Kitchen Ce ere 115 Craftwork Gifts You Can Make of Silver . 90 Handmade Sewing Case . 96 Small Pack Mule Carries Burden of Cigarettes . You, Too, Can Build This Doll’s House . i Woodworking How to Cut Your Own Moldings. 82 Smart Looking Wooden Seats for the Porch or Lawn . Using a Lathe and Power Saw to Build an Oak Stool . . . . 108 Ideas for the Handy Man Restring Your Tennis Rackets . 76 Easy Way to Make Exhibition Poultry Crates .. 78 Band Iron edt for Clothes Hangers .. 95 Lighting Your Heme Wedeibas:', 98 Blueprints for Your Home Work- eS oe . 103 How to Typowsite Your Nemes In- delibly on Tools... 106 Determining Electrical Polarity in the Home Workshop. . . 101 Can You Fit These Blocks To- gether? .. . 114 How to Cut Off a Bolt. of cb: (eo Making an a oe hee Sa Corn Hints for the Mechanic Lapping—Best of Shop Finishes . Use Magnifying Glass on a Dim Blueprint . The Right Grinding Wheel Saves High-Speed Tools ‘ When Filing Is a Waste of Time . Cut Off Bothersome Sleeves . Tallow or Lard Aids in ea i. Certain Alloys . Old Hacksaw Blades Make Useful Lathe Tools . . Shopmade Stool Leasens Welder’: 8 Fatigue ; Simple Vise Jaws Hold Work Parallel ‘ $8 8 8 88S & & v=) ~~ Ps at ceniin cin Meek ot oa BS CTI PO - 7 , - . — eagle 2S. Peer eee S297: Le : ree os ‘e — pie Sem at eee SERGE «tee et nd Ng Snes Ce = egeY Meee fe noc age . rit ssa &

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25 Cents a Copy $2.50 a Year

Pop opular Science MONTHLY founded 1872 381 Fourth Avenue New York, N. Y.

Table of Contents for October, 1930

LEADING ARTICLES American—Unknown to Fame—First Man on Record to Leave Earth on Wings . . By Robert E. Martin The romantic story of the world’s pioneer flyer Now—Radiophoto Storm Charts Sent to Ships at Sea How wireless map transmission aids ocean liners $1,000 Cash Prizes This Month .. . » sa Beginning a great new “What’s Wrong?” picture content Radio Now Walks, Rides, Flies By Michel Mok ’ How roving announcers work miracles to broadcast the news Flying with a Test Pilot . . . By Edwin W. Teale Thrills in trying out brand-new planes Machines Work Cup Defender . . ° Drawing by B. G. Seielstad Details of the American yacht that will race the Shamrock V Odd Rules Hamper Our Cars Abroad . . ‘ By George Lee Dowd, ‘Sr. Why Japan’s taxis have two horns and tail lights work from rear Monorail Aims at High Speed ......... An amazing plan for a 150-mile-an-hour railway We Have Found a Way to End Mississippi Floods . . By Brigadier General T. H. Jackson, U.S.A. How “Old Man River” is being tamed at last Build in Haste, Repent at Leisure . . By Charles W. Frank An architect tells of the home he built for himself New Tubes Increase Battery Set’s Power . . By Alfred P. ‘Lene How to get the most out of your receiver with latest equipment Grease and Stay Clean, Says Gus By Martin Bunn Lubrication pointers from the Model Garage man FEATURES AND DEPARTMENTS SS ee ee ae oe ee ee ee ee By Herbert Paus ee << . se « 1 ete 8 8-6 eS eee 6 Popular Science Institute Page . . . « « © © «© « © © « Our Readers Say— . . . * 2-62 @-e8 © € © Easy Ways to Do Familiar Household Jobs ‘a @ bk & 6% RE a.) Pens vg oe oe ee ea ee oe ee ee aw Helpful Hints for Radio ee oe OW om ee OO ee a em i Mie: . ..4 « 6 ¢ 6 © @ ©. 6 .€ ©. Useful Hints for Car Machinists . . . « « « « « « 19 22 23 26 28 40 42 72 74 12 14 70 71 75

AUTOMOBILES New Auto Jack Has Great Power Car Cooks Your Dinner . Charges Battery While You Sleep Accelerator and Brake Combined Cigarette Lighter Attached to Automobile Motor a Springs for Car Wheels Automatic Whistle Warns Motor- ists. Crash Car into Wail in Tire Test Bumper Works Electric Auto Brake Motorists Can Now Get Their Change in Gas . “Belgian Roll” to Shake Car Apart 85-Mile-an-Hour Bus Streamlined AVIATION Odd Flying Machines Designed to Vary Usual Modes .. Students Learn to Fly in Clipped Wing Plane. Springs Work 'Chute That Lowers Plane. Stunt Jumpers Ordered to Wear Two ’Chutes.. Radio Beacon Guides Blind Flight Biggest Airship Named Akron Mail Bag Unharmed by Fire Plans Ten-Mile Climb in - Ball. . Flying Boats Catch Poachers . . Motorcycle Gives Glider Send-Off Blimp Lands on ae Deck for Passenger i ea ENGINEERING Boulder Dam, Biggest Yet, Now under Way. . Chicago to Have First ‘All- Metal Apartment. Pacific Ocean Now ‘Being Carried 92 Miles Inland . Tank to Guard Base of London Building ‘ 43 43 51 51 HEALTH AND HYGIENE Autos, Ousting Horses, Banish Lockjaw . . 38 Blame New Tiny Germ for Creep- 45 ing Paralysis Air Purifier Resembles Zep —" Calorie Counter Tells You What to Eat 50

October, 1930, Vol. 117, No. 4. Popuuer Science Monthly is published monthly at 381 Fourth Avenue, New York, by the Popular Science Publishing Co., Ine. Entered as second-class matter. ser. 28, 1918, at the Post Office at New York under the act of March 3, 1879; additional entry as second-class matter at Chicago, Illinois. Application for entry as second-olass matter at Dayton, Ohio, is pending. Entered as second-class matter at the Post Office Department. Canada. Printed in U, 8. A. Copyright, 1930, by the Popular Science Publishing Co., Inc. Single copy, 25 cents. Nine months’ subscription, $2. Yearly subscriptions to United States, its A. L. Cole, ¢ rice-President and Secretary. possessions, and Canada, $2.50; foreign cuungsten. $3. The contents of this magazine must not be reprinted without permission. solicited contributions, and cannot guarantee the return of such material or insure against its loss. In presenting numerous stories of new products of applied science, Popular Science Monthly does not underwrite the business methods of the individ- uals or concerns producing them. The use ,4 Popular Science Monthly articles for stock-selling schemes is never ae. R. C. Wilson, Vice-President; he editors are not responsible for un- B. Capen, President and Treasurer;

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x Popular Science Monthly. for October, 1930 MODELS Model of Eiffel Tower Built for Radio Mast . 50 Offer $50,000 in Prizes for "Model Makers . . 55 2,000 Companies Busy Making Model Planes . . 56 Air Thrillers Studied with "Model at Home . o. om Real Gas Engine Flies Plane - 62 Adding Figures to Our Model of a Queen’s Sedan Chair . 2 Model of the Curtiss Condor . . 106 Clothespins Useful in Coach Model Making . 118 This Toy Airplane Does. Every: thing wens Fly . « 134 NATURE Mile-High Skyscraper Would Equal Ant Hill . . 45 Odd Views of Animals. . 52 Pinchot Gets Rare Photo of Skate 62 “Extinct” Passenger Pigeon Seen 62 NEW PROCESSES AND INVENTIONS This Phonograph Also Shows Pictures . . 31 Mechanical Fish Cuts Mines Loose 32 Street Signs Lighted Both td and Night 3 32 Hollow Concrete Piles . ‘ 32 Powered Cradle Rocks Baby ‘ 33 Rain Closes This Window oa Electric Cutting Tool Is Portable 33 All-Electric Typewriter NowHere 33 New Piano Player Can Be Car- gee ie Cees’. 5 oe tw et ew Machine Parts’ Size Recorded Instantly o> lec. da Se Electric Eye Opens Automatic Door . ee: Razor Handle Holds Pencil to Cure Cuts .. ;. oe Aluminum Gas Pipe Will Bend - & New Lifeboat Is Driven by Levers 35 Closing Book Puts Marker in Place 38 Mirrors Cast Image on Screen be- hind Speaker .. 38 World Blown Up to Study Geog: raphy. i 38 Phone Base Has Index le 38 Poison Gas Tank Kills Boll Weevil 44 New Harrow-Plow . ‘ 44 Pins in Book Form . . 44 Heat Control Saves Soldering Iron 45 Arrow on Bike Shows Turn 50 Transfer Slip Printed on Car . 51 Automatic Watchman Rings Alarm Bell ‘ 54 Slows Motorboat Down to Right Fishing Speed. i 55 Trigger Fires Oil from Can ‘ 55 Lumber Piling Machine Aids Russian Industry . oe Unsinkable Boat Meets Test ‘ 60 Liquid Paper Helps Farmers : 61 Tool Is Handle, Wrench, Hammer All in One . . 61 Saw Has Big and Little Teeth 61 Self-Adjusting Caster 62 Thumb Tacks in Street 63 Wire Stripping Pliers 64. ¢ @ Faucet Connection Easy with New Hose Reel eS PHOTOGRAPHY New Lens Cleaning Kit . . . New Process Shows Mites as Giants. To Make Colored Movie of Fish Mirror Gives Distance to Movie Camera Copies Rare Books . . Rocket Gets High Altitude Photos Making Old Eyeglasses Into Photo Frames . Taking Photos Before an Open Fireplace RAILROADS Periscope for Trains ‘ Pulls Locomotive by Nose . Monarchs of the Rail Get a Bath Glass Stops Sun’s Heat Squeeze Brake Stops Car . No Fire in This Engine Shock Absorbing Rails . Revolving Seats Add to Railroad Comfort Locomotives Used to Fight Fires Mechanical Iceman Now Gives Ice to Dining Car aie Biggest Engine Frame in One Piece .. . é loene UNUSUAL FACTS AND IDEAS Old Ironsides, Refitted, Is. Good as New ‘ ‘ Transparent Slipper Fits Shoes Big Rocket May Rise 13 Miles Chinese River Moves Its Bed 90 Miles Radium in Lakes Makes Ontario's s Fish Big. Great Race Horse Gets $50,000 Home. Talkies to Review 61 ‘Conturies of Figuring ‘ Can Now See Water Turn to Hot Ice Meters " Challenge Famed Gon- doliers . Fly Now Bred to ‘Kill Peach Pest “Mike” Shows Cricket Fine Musician r ‘ Two Alone Build Stone Home ‘ Four-Foot Boat Hits 40-Mile Clip Gas Smell Now Saved .. Babel of Tongues Sorted by Phone Rare Photos Show Steps in Growth of Orchid . . - How the Staff of Life is Made ‘ Tiny Auto Runs Itself When Light Hits It . Sodium Lined Tubes May Carry Electric Current R Glider-Kites Do Stunts "While Held by String . Babies Branded with Ultra- Violet Light ° Lamps Rid Rare Statue of Pests Work with Big Rockets Is Again Under Way. . Highest Thing on Sea “ Majes- tic’s Mast . Six Astrologers ’ Fail ‘oe Meet Simple Test ‘ >» Giant Harrow 65 Feet Wide 64 59 61 63 121 . 131 ¢ Electric Shovel Grabs 15 .Tons at One Bite in Iron Mining 65 Violet Light Is All Sea Gets 700 Feet Down .. ote FOR THE HOME OWNER Trap for Poisoning Red Ants. . 119 Homemade Candle for Emergency 121 Ways to Overcome Outside Paint- ing Difficulties 122 Cleaning Furniture and Leather 131 Turning Lever Valves . 133 CRAFTWORK How to Turn Totem-Pole Can- dlesticks This Sewing Screen is a ’ Gift to Please Any Woman . ; Copper Braid Decorates Lamp Stand of Pipe 96 Every Camper’s Axe Deserves a Good Sheath... . 102 Toy Table and Chairs - 108 Imitating Wrought Iron Colonial Hardware How to Cast a Signet Ring i in a Cuttle Bone Mold . . . .114 Picturesque Electric Lantern Made for Sixty Cents . . . 120 IDEAS -FOR THE HANDY MAN Driving Small Power Tools . 75 Woodworking Do’s and Don'ts 77 Complete Shop Built in Garage 86 An Ingenious Way to Use a Hack- Saw Blade... 86 Revolving Nail Box for Bench 98 Insulating Temporary Wire Con- nections . . 106 A Modernistic Handy Table . 104 Gluing Small Fancy Boxes . . 107 Fishhook Disgorger Keeps Line Taut . ree Rifle Shoots Rubber Bands - 110 X-Bars Keep Vise Jaws Parallel 112 Gluing Veneered Furniture - 112 Blueprints for Your Home Work- shop. . . 113 Scaling Furniture ‘Down ‘to ‘Suit a Child. . . . 115 Wiring Your Home Workshop - 116 Upholstered Radio Bench is Easy to Construct . oka Tools Make Inlaying Easier - 127 Bevel Guide for Small Circular Saw. . . 128 Homemade Tool Turns Knobs . 129 Constructing a Magazine Holder . 130 Lock Joint on a Circular Saw . 132 Interest in Boat Building « 133 Saw Filing Clamp of Wood . *. 135 HINTS FOR THE MECHANIC Better Ways to Cut Thin Metal . 90 Making Laps for Toolroom Work 94 Turning Set Screws . - 102 Film of Oil Corrects Grinding Errors . - lll How to Grind Holes of Small 64 @ Diameter . . cc o'ic-« B®

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25 Cents a Copy $2.50 a Year l Pop ner C ONTHLY founded 1872 381 Fourth Avenue New York, N. Y. Table of Contents for November, 1930 LEADING ARTICLES Radio Aids Police in Swift Arrest of Crooks .. . By Edwin W. Teale How flashes through the ether trap the criminal at work Why Midget Golf Swept Country . By Jesse F. Gelders The fascinating, inside story behind America’s latest fad America to Save King of Horses . By James W. Booth How breeding will preserve famous Arabian steeds Whirling Spools Lift This Plane . . ....... Details of an amazing aircraft built on the “rotor” principle Can Our Camera Fool Your Eye? A new $1,000 “What’s Wrong?” picture contest Blind Flying—a Race Against Death . By Assen Jordanoff A famous airman tells of his battles with fog Rescue Tank May End “Sub” Deaths . . By John E. Lodge Inside the strangest water tower in the world Air Progress from Lindbergh to Coste A picture review of aviation’s advance between two fommeus flights Weather Man Makes the Air Safe . . By George Lee Dowd, Jr. How a new high-geared forecasting service works I Studied the Birds to Learnto Fly . . By W. Hawley Bowlus What pelicans and buzzards taught a noted glider pilot Saving Runaway Farm Lands . . By Charles Fitzhugh ‘Talman How novel engineering projects will battle soil erosion Avoid Fads, Plan for the Future . . By Harre 'M. Bernet What happened when an architect built his own home Radio Aims at Remote Control . By Alfred P. Lane How to keep your receiver out of sight Expert Advice on Auto Lighting Gus and Joe discuss a car’s lamps FEATURES AND DEPARTMENTS By Martin Bunn Cover Design Financial Page , Popular Science Institute Page Our Readers Say— . Household Inventions, to Speed Vou Work Editorials ” Helpful Hints for Radio aio The Home Workshop Kinks to Help Auto Mechanics By Herbert Paus 19 24 26 27 42 54 59 72 78 80 12 14 74 76 77 81 92 > > AUTOMOBILES Thermometer in Auto . 51 Front-Wheel Drive Used in 1908 52 Where the Old Car Meets Its End and Starts Life Over Again 61 Colored Auto Tires to Match Car’s Paint = 70 AVIATION Whales Pursued in Planes Are Shot from Air . se de A Junk-Heap Plane . 49 Air Light Visible 300 Miles Away 63 New Glider Motor Weighs 22 Pounds 63 Air Express May Span ‘Continent 63 Curtiss Helicopter Rises in Se- cret Tests ° 5 ae Plane Battered by Hail . ‘ 64+ Tilting Wings Absrob Air Shock. 64 Glider Sails 101 Miles . . . 64 Pilot’s Map in Case Protected from Wind . 64 New Bomber Carries Gunner Be- hind Rudder .. 64 Pilot Uses Landing Lights as Rudder . 64 Biggest Airship “Gets Its "First Helium Cell . 65 Balloons Give City Gas ” When Pipe Line Is Cut .. 65 Can Dispel Fog but It Costs Too Much . 65 American Engines Put in " Giant Dornier DO-X _ . 65 Glider Launched by a “Motorboat 65 Planes Bomb Miniature Village 70 4 ENGINEERING Big Machine Runs in Hydrogen Gas Tank . . : 35 Big Crane Lifts Little One ie Floating Span Is Used as ” Railroad Bridge Rises 62 Steel Yoke Drags Mighty Log 67 America’s First Monorail Line Planned for New York . 71 HEALTH AND HYGIENE Electric “Incubator” Now Aids Premature Babies p Revolving Sanatorium Always Faces the Sun . Lack of Cold Germs "Makes Islanders Move ite, at ee November, 1930, Vol. 117, No. : fewer Science Monthly is published monthly at 381 Fourth Avenue, New York, . Y., by the Popular Science Publishing Co., Inc. Entered as second-class matter. ‘pee. "28, 1918, at the Post Office at New York under the act of March 3, 1879; additional entry as second-class matter at Chicago, Illinois. Application for entry as second*class matter at Dayton, Ohio, is pending. Popu tered as second-class matter at the Post Office ponent, Canada. Printed in uals U. 8. A. Copyright, 1930, by the Popular Science Publishing Co., Inc. Single copy, 25 cents. Nine months’ subscription, $2. Yearly subscriptions to United States, its . L. Cole, Vice- President and Secretary. possessions, and Canada, $2.50; foreign countries,. $3. The contents of this magazine must not be reprinted without "permission. The editors are not responsible for un- solicited contributions, and cannot guarantee the return of such material or insure against its loss. In presenting numerous stories of new products of applied science, Science Monthly does not underwrite on ee methods of the individ- or concerns producing them. The use of P — selling schemes is never eptprtee?. 0. art Cap a so and Treasurer ; . C, Wilson, Vice-President; e Monthly articles for

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=) Popular Science Monthly for November, 1930 MODELS Striping Coach Models .. . 84 Sampan Model Illustrates Novel Way of Making Hulls. . . & Whittling a Trimotor Model . 112 Inside Facts about Rubber Motors 118 Simplifying Your Ship Models . 128 Home Workshop Honor Roll . . 134 Tool for ae: Thin Piano Wire .. . 135 NEW PROCESSES AND INVENTIONS Spring Jaws on Club Pick Up Golf Ball 5 32 New Phonograph Records ‘Light and Unbreakable. 32 Machine Keeps Road Builders Honest 34 New Steam Turbine Locomotive Forty Percent More Efficient 35 Plunger in Toothbrush Makes Bristles Whirl . 45 This Vacuum Mouth Dusts Small Places . 45 Climbing Vines ‘Held in Place with Metal Hooks . . 46 No Direct Draft with New Type Ventilator . 46 Blinking Light Tells Dampness of - Lumber ‘ . 47 New Shaving Brush “Clips” to Cream Tube . 47 New Shoes Shaped to ’ Fit Like Old Ones .. 50 Narcotic Bullets Put Wild "Beasts to Sleep .. 50 Use Life Preserver a as Cushion . 50 Mounting Helps Flag Fly Freely 50 Wire-Paper Latest Building Aid 52 Robot for Library Stamps Cards 53 Flee Down Guy Wire to Escape Oil Well Fires . 53 New Nozzle for Hose Waters Plants’ Roots . . 66 Projector Gives View of Micro- scopic Objects. 66 When Stroke Is Right, Golf Club Whistles . 67 New Rail Crossing Ends Wear and Noise 4 68 Letter Box Raises Lid as ; Post- man Drives Up . 69 Car Coupler Cuts Railroad Hazard 69 New Lamp Has Three Shapes 69 Flashlight for Dial Telephone Clips On. 70 Gooseneck Tower Used to Fight Oil Fires. 70 New Brick Veneer Is Only One Inch Thick ‘ ; 70 Board Rack Is Reversible 70 Wood Finish for Walls Now Comes in Rolls pc here Se PHOTOGRAPHY X-Ray Pictures Show Penguin's Strange Neck 33 Movie Made as Surgeon Operates 47 New 37-Pound Talkie Camera, Soundproof. 52 Butterfly Wings Take Photo of Themselves ‘ 52 RADIO Loudspeaker Heard 25 Miles Away 53 ¢ @ Radio Waves eee to Kill Fruit Pest SHIPS Windjammer with Training Crew Lashed by Storm x Electricity Launches Lifeboat Boat Runs Without Crew . ; Odd Vessel Built to Carry “Sub” . Want Tugboats to Use ee Not Whistles . Tom Thumb Golf Goes to ‘Sea on Big Liner . . Two Ferryboats Made Gigantic Wet Battery ; UNUSUAL FACTS AND IDEAS Man’s First Finger Shorter Than Woman's. Piano, Mandolin, Cello Combined with Guitar. Seek Pound’s Weight in Washing- ton, D. C. . Bees tell Time, but How Nobody Knows. . Horse’s Life Story Now Complete Two-Ton Earth Spins in Office Building Population, 17,000,000 Women Talk Easier—Therefore More. Chemists Make Rubber Pleasant to Smell. Push Button Starts English Fire Engine . . Makes Concrete That Rises Like Bread . New Race of Honeybees Now Being Bred . S Ivory Tusks by the Ton Cars Hurled into Air Furnish New Thrill . . Coat Hanger Pedals Used to Play Piano. Smoke Veil Guards ‘Citrus Trees Camera on Job as Oil Well Bursts into Flame . Outboard Motorboat Hits 50-Mile Speed... ‘ New Ways to Study ‘Stars His Own Railroad Car Fiddle Made by Hand Homemade Diving Suit A Back Yard Circus One-Plant Hothouses Now Used in England. Play Football on 32-Inch Field Family’s Bicycle Built for Five Caddies in Wire Armor Defy Careless Golfers . Quarter-Inch — Works « on 110 Volts Aquaplaning on Land Is New Dare-Devil Stunt “Cat’s Cradle” Figures Man’s Migration Tail Carried Brain of Prehistoric Monster. Vast Death Belt | in Sea Is "Found by Carnegie P Americans Now Exploring Egypt’s Oldest Pyramid ‘ “Daylight” Furnished by Imita- tion Windows Since 1920, ‘Jumps Trace >» Giant Awning Shades | 20 "Stores @ Burning Bluff Is Big Mystery 67 > Circuit Breaker Can Hold a Dozen Men Builds Outboard from Popular -Science Plans . Gas Blast aes Odd London Relic 68 68 9 1 FOR THE HOME OWNER Space Saving Closet Cabinet 96 Removing Soot frem Chimney. 107 How to Apply Metal Weather Strips to Windows . . 108 Hanging Curtain Rods . . 111 Making a Doorbell Ring Musically 117 How to Imitate Tile Effects with Stencils . 126 Old Oil Pump Drains Flooded Basement . 127 Damp-Proofing Cellar Walls in Color . . . 135 CRAFTWORK Leather Case for Camera . . 84 How to Make Decorative Weather Vanes . oe Jee Copperplating Baby’s Shoe ‘ . 116 WOODWORKING You Can Build a Screen Just as Beautiful as This . . . 88 A Modernized Lounging Chair . 102 The Right Hinge Saves Work . 114 Easily Constructed Electric Photo Printing Box . . o » aCe Aids in Sandpapering . . 133 IDEAS FOR THE HANDY MAN Ten Shots at a Clip with This Toy Machine Gun . . Golfing at Home on a Nine-Hole Parlor Course. . Improved Horseshoe Pitching Court . Wooden Beam Compass for Large Circles . Blueprints for Your "Home Work- shop Starting a “Nail in a Difficult Place Funnel for Separating sarang Solutions ; A Socket- Wrench Kink . ‘ Glass-Front Hoppers for Hold- ing Nails and Screws. . A Quick Way to Clean Black- board Erasers. . Chemicals Used for Tinting Brass One Padlock Fastens Row of Lockers gg ed ok HINTS FOR THE MECHANIC New Ways to Use Old Tools . Old Bill Says—. . How to Clean Oily Leather Belt- ing. . Lapped Joint Improves "Endless Belts for Power Tools . . Can You Edit These eas State- ments? ’ . 100 81 82 90 - ill 113 115 - 120 120 121 . 122 124 . 131 98 - 100 . 125 -

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CINE: F PREG TARO Pe 25 Cents a Copy $2.50 a Year Psp pular Sc ONTHLY founded 1872 381 Fourth Avenue New York, N. Y. Table of Contents for December, 1930 LEADING ARTICLES How Firebugs Burn Millions New feats of cctectives who war on incendiaries Streamlined Auto Can Almost Fly .. . Details of a famous airship designer’s amazing invention My Forty Years of ane Wild Rides Cows ‘ The first chapter of « a pioneer pilot’s own adventure Dynamite Hurls Dam into Place .. . How engineers blocked a racing river in six sosnads $1,000 Cash Prizes . . as A great new “What's Wrong? ?” contest, and a a second chance at another New Steel Alloy is Rustproof New Safety Under the Sea By Alden P. The romantic story behind the latest “super-stainless” By Edwin W. Teale in Rubber story Armagnac metal An observer’s first-hand story takes you on a submarine ride Blow Errors Crash the Stoutest Planes New facts about the “why” of air accidents By H. C. Davis Oyster Pearls, Worth Millions, Made to Order .. . By Earl Chapin May Farming gems in ocean cages for Milady’s necklace We Still Live in Last Ice Age By Charles Fitzhugh "Telmen What an uausual piece of scientific detective work revealed Phil Cook Mikes His Whole Show at Once . . By John E. Lodge Secrets of a famous radio entertainer’s fifteen voices Flops of Famous Inventors Freak patents from the workshops of noted men . By George Lee Dowd, Jr. Model Your Home and See It Before You Start .. By Joshua H. Vogel How a Seattle architect designed his own home Radio Now Has Tone Control New ways to change your receiver’s voice What You Should Know About Antifreeze By Alfred P. Lane By Martin Bann Gus and Joe tell how to guard your car in cold weather FEATURES AND DEPARTMENTS SE aaa Financial Page Popular Science Institute Page * Our Readers Say— Thirteen New Aids Designed fee the Besy ‘tate Editorials . . ea a) eae a ew Helpful Hints for Radio amy ‘ The Home Workshop .. . Useful Hints for Car Workers By Edgar F. Wittmack - 100 By Michel Mok 19 22 By Capt. Horace B. Wild 23 26 27 31 40 42 57 59 78 84 85 12 14 82 83 87 > AUTOMOBILES Coil Springs Work Garage Door . 34 Biggest Truck Holds 100 Tons 35 New Handle Works Car Brake 38 Left-Turn Car Signal Has Mirror Attached. Tire Inflator Works Without | Human Aid. . 69 Fast Army Truck Hill- Climber « vA 300 Miles an Hour Aim of New Auto. 72 Electric Heater Keeps Tce off Windshield ‘ 74 Candle Keeps Ice from Forming on Windshield . 75 New Traffic Post Made of Rubber 76 Thirty-Foot Turntable — Buses 77 Cars Kill Off Rabbits ‘ 77 Homemade Auto Air Filter Keeps Out Grit You Can Improve Your Garage By Applying Wallboard . 126 AVIATION Big Bullet Explodes When It Hits Airplane Fabric . 46 Vanes Hold Plane Level . 54 New Mail Plane Hides Wheels as It Rises . 54 Sunlight Beacon Guides Aviators 54 Plane, in Flight, Refuels from Car 54 Parachute Lowers Plane and Pilot 55 Tailless Plane Lands at Low Speed. 55 Night Flyers Can ‘Now Tell Cloud’s Height 55 Air Line Carries Only Freight . 55 Glider in Air Looks Like Gigantic Bird. 56 Neon Gas Lights ‘Guide Traffic in the Air. - 56 Expect High Speed of Rocket- Driven Plane. 56 Army’s Mystery Plane Passes Speed Test. 56 Pilots Learn to Fly in Anchored Glider... ‘ 62 Big Mike Detects ‘Airplanes 69 Airplanes Stop Prairie Fire 69 ENGINEERING Machine Solves Hard Problems . 32 Runs Switchboard From Armchair. 46 Claude’s Power Tube Laid Deep in Sea. 62 Big New Dam Supplies "225,000 Horsepower. . 64 Use Arc Welding in ‘Skyscraper . 64 HEALTH AND HYGIENE Body of Rubber Aids Students . Robot Breather Fills 7; if Muscles Quit 39 * copy, 25 cents. Nine months’ December, 1930, Vol. 117, No. 6. Popular Science Monthly is published monthly ., by the Popular Science Publishing Co., ; matter Dec. 28, 1918, at the Post Office at New York $ matter at Dayton, s matter at the Post Office Department, Canada. Printed 8. A. Copyright, 1930, by the Popu’ar Science Publishing Co., Inc. Single subscription, $2. Yearly subscriptions to United States, its possessions, and Canada, $2.50; foreign countries, $3. The contents 6f this maga- at 381 Fourth Avenue, New York, N. Y Inc. Entered as second-class under the act of March 3. 1879; additional entry as second. clas ed Entered as second-cla sure against its loss. zine must not be reprinted without permission. The editors are not responsible for unsolicited contributions, and cannot guarantee the return of such material or in- In presenting numerous stories of the new products of applied science, Popular Science Monthly does not underwrite the business met the individuals or concerns producing them. articles for stock-selling schemes is never authorized. O. B. Treasurer ; R. C. Wilson, Vice-Pres ident; A. L. Cole, Vice-President and Secretary. s of The use of Popular Science Monthly Capen, President and

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Popular Science Monthly for December, 1930 Our Diet Hurts Eskimo, His Is ¢ Bad for Us. 70 Man’s Blood Drawn Off, Purified, Reinjected . 71 German Babies Now Get Sun Bath . 75 Teach Women to Detect "Bad : Foods . . . . « «= MODELS Here It Is—Our New Model Destroyer 327. 87 Full Block Control For Your Model Railroad . ‘ 94 A “Tailless” Model Plane : 110 ys Air Yacht—Another Scale Model Whittled From Wood . 118 Ship Model Photo Used as Christmas Card . . . . 125 Ship Model Short Cuts. . 131 Our Blueprints — Build This Model ‘ . 139 NEW PROCESSES AND INVENTIONS Arm Holds Golf Ball for Indoor Practice . 32 Electric Eye Finds Flaw i in Bottle 33 Golf Joined to Pool in New Outdoor Game . 33 Hinged Handle Makes. Parasol Adjustable 33 Charcoal Filter Ends Many Pipe Worries . 34 Phonograph Can Record "Radio Program . ‘ 39 Midget Car Uses Man Power és 39 New Harvester Works on 60 Percent Slope . . 48 Phone-Holding Bracket Leaves Hands Free . Se New Bridge Table Has Card Compartment. 52 — Helmet Has Mask over. - Nail, Seals Hole in Roofing B 63 Thermometer Clings to Outside of Window . 64 Portable Lift to "Save Fire- Trapped Victims 68 Electric Power Plant Is ‘Carried Around Novel Cards Teach Children Music . 69 New Thrills from Winged Bicycle 70 Cylinder Toothbrush Has No Bristles 71 Ultra- Violet ‘Light Finds Check — Forgeries . i Electric Scrubber Cleans Fast a ee Saw Blade for Power Drill Cuts Metals. 73 You Can Now Press Pants While in Them 76 New Oilless Bearing ‘Lubricates Itself. 77 Disappearing Keyboard Changes Piano’s Looks swf PHOTOGRAPHY New Distance Finder Designed for Camera . 33 New Tank Develops Air Map Film 47 Camera Saves Beauty ‘of Cologne’s Dome. 65 Movie of Black Smoke Warns Factory Men... 74 Ancient Beasts Live in Movie 76 @ RADIO Radio Set Built into New Piano . Automatic Radio Clock Tunes in Stations German Vacuum Tube Has No- Inside Grid. Records Now Used to Broadcast Programs ae a ae UNUSUAL FACTS AND IDEAS Tiny Homemade Motor Runs 13-Foot Canoe . Visible Clock Times Football Games. Woman Goes 700 Feet i in Making Apron ‘ Dice of 3, 500 Years Found in Ancient Ruin Powerful Lodestone From Utah . Army Trucks Take Men Over Longest Bridge. Run Big X-Ray Tube at 600,000 Volts’. Roller-Skiing New Summer Sport Lights Play a Tune. . Use Five Farms as Big Laboratory. ° Now Make Rubber from Wild Mexican Shrub. ‘ i Engine Runs 66 Years . . Northern Lights, Made by Man, Guide Flyers. ~ — Bears Get Taken for a i Automatic Lights Run New York Traffic . Farmer Sees Inside of Tornado— and Lives. Divers Set Record Raising Gold from 400-Foot Depth Pe Motorman’s Reactions Tested German Designs Mushroom House re Star’s Heat Measured by New Vacuum Tube... ~~ Five Minutes of Astronomy — German Homes Built in Three Circles Laboratory Tests Cows’ Efficiency . Big Loudspeaker Heard Thou- sands of Feet . e Ocean Washes through Spanish Aquarium. Acid Etching Now ‘Used i in Novel Way to Make Dainty Glassware Phonograph Music Now Used in Church... Grade Pupils by Eye Movements Power Plant Waste Warms Hot- houses . ; Largest Loudspeaker Horn for Auditorium . Urge Factory Workers to “Wear Thick Spats. ‘ Australian Flashlight Set Off in Hartford : Tropics Ship “Tee” to “Save North’s Food . Electric Lamp Is Blown Out, Lights with Match . Russian Clubhouse Is of Glass New York Skyline Now and Fifty Years Ago. . Exhibit Brazil’s Flexible Stone Lighthouses of Strange Designs Aided by Balloon, Man Leaps Hundred Yards. This Mechanical Robot Writes ‘Its Answers 38 38 39 46 47 48 48 48 49 49 49 49 50 51 52 52 53 53 53 62 63 63 63 65 65 69 > q > Japanese Beetles Now Killed in Carload Lots. ose ae Hottest Spot on Earth Hits 900,000 Degrees. 70 Puppet Show Is Run by Children 71 Trolley Matches Speed of Plane 72 Each Seat Has Lamp in London Theater . . 72 Cows Eat Sawdust ‘and Thrive on Strange Diet. 73 Electric Dispatcher Runs Trains 73 White Wings Now Ride One-Man Cleaning Car is Motorcycle Caught in 1 Record Speed Test. 74 Street Cars Washed by Automatic Sprayer... . 74 Land Skiff Races New Sport i in England. 75 Models to Give View of "Fourth Dimension . 75° Study Radium Nine Feet “Away . 77 FOR THE HOME OWNER Shoe Holder ey to anes Door . .. oe Weatherstripping a “Door . 114 Kalsomining Ceilings . . . .117 Bread Gage Insures Uniform Slices . «'« =a Simple Plumbing Repairs . 132 New Door Locks That Are re Easy to Install. . 135 CRAFTWORK Notebook in Leather . 104 Trick Ways of Inlaying . 122 Marbleizing With Paint - « 130 Novel Lamp Sheds nei Through Glass Rods . . . 136 WOODWORKING Cabinet For Lathe Tools . . 91 A Gay Cabinet to Hold Christmas Toys . . 93 IDEAS FOR THE HANDY MAN A Child’s Christmas Show . . 91 Making Your Home Shop Safer . 92 Ripping Boards on a Small Saw . 93 Chremium Plating Easily Done . 102 in a Home Shop Saw Table. - 117 T-Rest Extends Range of Small Blueprints For Your Home Work.’ shop. . wae Lighting Your Home Aquarium . 120 Testing the Glue You Use . 124 Jig Saw Attachment For Round Work. . 129 Storing Round- Bottom Chemical Flasks How to Do Tricks With ¢ a Brace and Bit. r . 134 A Switchboard For Experimenters 137 An Easy Way to Make a — Blackboard 7 . 138 HINTS FOR THE MECHANIC Tips For the Ingenious Shop Man 106 What to Do When Drills Dig In 108 Old Bill Talks Shop... 108 Wiper Keeps Dirt From Beneath Surface Gage