INDEX TO VOLUME 91 



Page 

 One Inventor's Idea for Lengthening the Life of a 



Rubber Tire • 255 



Making a Trolley-Car of the Motor-Truck 261 



Device to Remove Automobile Bodies Without 



Scratching 262 



The Newest Child's "Pushmobile" 263 



An Easily Adjusted Tire That Locks Itself on the 



Wheel 268 



A Motor-Truck for Ice Cream Delivery 272 



Tipping Truck for a Large Cylindrical Oil Tank. . 282 



Miniature Automobiles and Their Race Meets. . . . 283 



Effects of Oil and Grease on Rubber Tires 288 



Repairing a Worn Plunger in an Automobile Oil- 

 Pump 293 



A Tractor Trailer Made for an Old Automobile. . 295 

 Inflation and Weight Governs the Resiliency of 



Tires ....296 



Constituency of Rubber for Side Walls of a Tire. . 302 



Salvaging Motor Wrecks with an Equipment Car 324 



Motor Truck Carries Thirty-Eight Soldiers 326 



Live Steam or Vapor to Save Gasoline 351 



A Lock which Makes the Ford Car Thief-Proof. . . 353 



Automobile Accessories 357 



Men Whom the Automobile Has Made Rich . .358-359 



The Gasoline Automobile as a Locomotive 360 



The Air-Propelled Unicycle 370 



Loading Coal Baskets from a Motor Truck 379 



Cleaning the Air Fed to Automobile Cylinders. . 383 



The Biggest Automobile Spring 384 



What Six Gallons of Gasoline Can Do 409 



A Dust-Proof Cover to Keep the Automobile Lug- 

 gage Clean 417 



A Tire Pressure Gage No Bigger Than a Pencil. . 421 



Storing Automobile Fenders 424 



A Garage Built with the Contour of a Cathedral. . 431 



An Anti-Kick Device for the Ford 435 



Caring of Inner Tubes to Prevent Chafing 455 



Dust Proofing the Automobile Priming Cup 455 



Rim Cuts in Tires 470 



Automobiles, Motor-Trucks and Accessories . . .508-51 1 



Turning a Car in Its Own Length 512 



This Truck Loader Will Lift One Ton Ten Inches 



Per Second 517 



Your Motor Is Known by the Piston Rings It Has 522 

 The Small Caterpillar Tractor Rings the Death 



Knell of the Industrial Railroad 532 



The Rising Price of Automobiles 543 



Inspecting a Six-Mile Tunnel by Automobile 544 



A Motor Truck Line I 540 Miles Long 548 



Advertising by Motor-Truck 549 



Photographing the Jolts of an Automobile 550 



Loading Trucks Without Disturbing Sidewalk 



Traffic 554 



A Car-Lifting Brake 560 



Improved Electric Gearshift for Autos 567 



Buying a "Used Car" 573 



This Tire Pump Gets Power from the Engine 



Crankshaft 585 



A Harrow-Like Brake for Mountain-Climbing 



Automobiles 590 



The Common Rotary-Valve Gasoline Engine Is a 



New Departure 600 



Testing for Trouble That Causes Poor Auto Lights 610 



How to Relieve Your Auto Brakes 617 



Electrically Operated Turntables for Automobiles . 669 

 Automobiles, Motor-Trucks and Accessories .... 674-7 



It Has Both a -Pneumatic and a Solid Tire 681 



Preventing the Ford Engine from Overheating. . . . 687 



Touring in a Motor-Truck 697 



Transporting a Precious Mirror 703 



An Automobile Safety Device 705 



Kerosene-Driven Farm Tractor 720 



Hauling a Seven-Ton Truck Out of the Mud 735 



Changing a Roadster Into a Five-Passenger Car. . 737 



Getting More Mileage Out of Gasoline 738 



A Simple Cylinder Re-Boring Machine 748 



A New Way of Cushioning the Front Spring Action 



of an Automobile 828 



Three-Purpose Electric Drill 828 



The Automobile Driver Must Know What to Do in 



. Case of Accident 83 1 



Bell Gives Warning When Automobile Backs Up. . 834 



A Powerful Motor Sprinkler 849 



New Motor Truck Kitchen 85 I 



Automobile Accessories 852-53 



Mirrors to Avoid Auto Accidents 855 



Burning Distillate in Your Auto Engine 864 



Page 



Keeping Auto Engine at Right Temperature 866 



Turning the Headlights Electromagnetically 919 



Forty-Five Miles an Hour on This Motorcycle Sleigh 920 

 An Automobile Steering Wheel for a Bob-Sled. . . 928 



NATURAL SCIENCE 



The Grave-Digger Beetle 25 



How Scientists Capture Mosquitoes Alive for Ex- 

 periment and Study 26 



Japanese Mosquitoes for Bird Food 68 



Counting the Drops in a Fog 91 



Mountains Float 1 08 



The Common Housefly Is the Most Unpopular of 



Insects 110 



The Misunderstood Shark 196 



Teaching the Proper Care of Forests by Object 



Lessons 1 99 



It Is Beautiful Because It Is So Ugly. 201 



Teaching Children Natural History with Animal 



Pictures Made of Sand 201 



Mysterious Ice Mines 207 



Poison Ivy and How to Avoid It 207 



The Curious Ways of Egypt's Holy Beetle 252 



What Monterey Did with a Whale 255 



Everybody Knows the Squash Bug 264 



Coaxing Music from a Pile of Rocks 267 



Imitating Nature with a Miniature Volcano 286 



An Irish Thrush Rings for His Food 288 



Potash from California Sea Kelp 325 



Operating upon Trees 346 



Unwashed Sponges Are Dirty 351 



Penitentiary Roof Garden 390 



Feeding London's Zoo Animals 400 



The Night Song of the Tree Cricket 406 



Faces in Walnut 407 



Why Pheasants Need Foster Mothers 410 



Growing Umbrella Handles ,. 420 



How a Cyclone Bent a Flagpole 433 



Why Does a Cat Have a Tail? 438 



This Bird's Nest Is a Two-Room Apartment 525 



If You Had No More Teeth Than an Elephant You 



Couldn't Be a Soldier 572 



Teaching the Truth About the Misunderstood 



Snake 579 



Rivers That Flow in Two Different Directions .... 678 



Why Do Salmon Go Annually Out to Sea? 681 



A Thirty-Five Acre Island of Mud Near Memphis 721 



The Robber Crab 730 



Orchids That Grow on Telegraph Wires 731 



How Plants Accommodate Themselves to the Cli- 

 mate f 737 



San Salvador's Terrible Quake 741 



A Lizard That Squirts Blood from Its Eyes 805 



Palm Spiings 805 



Snow Honeycombs and "Penitents" 805 



How Did One Egg Get Inside of the Other? 826 



The Cut Branch Did Not Die 836 



Exploded Beliefs about the Arctic 839 



You Can Hold a Dozen of These Coconuts in One 



Hand. . 848 



The Eccentricities of the Sleeping Horse 851 



Can a Frozen Fish Be Restored 873 



Mvsterious Sound That Baffles Science 881 



Eat Your Dates with an Easy Mind 918 



PHOTOGRAPHY AND MOTION-PICTURES 



A Photographic Trick— Try It the Night of the 



Fourth 7 



Making "Night Scenes" for the Motion Picture. . . 24 



Wireless in the Talking Movies 33 



Making Motion Pictures at Home. 54 



Taking Motion Pictures on the Road in a Queer 



Vehicle 61 



An Attachment Which Will Lock Your Camera to 



the Tripod in an Instant 120 



Dinner Served in Gondolas on a Champagne River 220 



Camera Handled Like a Pistol 241 



Directing a Motion Picture Show from the Mana- 

 ger's Office 254 



Taking Snap Shot Action Pictures at Night 280 



A Solution for Reclaiming Over Exposed Blue 



Prints 287 



Leveling a Motion Picture Camera Tripod 292 



A Quick Action Electric Switch for Photographers 307 



Taking the Glare Out of Motion Pictures 324 



