Page 



What Poor Pavements Cost the Automobile 



Owner . 427 



Cleaning the Oil-Pump Screen on an Automobile 



Engine 449 



Removing aHeavy Truck- Wheel Without a Chain- 

 Block 451 



Using Dirty Waste Oil from Automobile Crankcases 452 



An Improvised Trouble Light for Motorists 458 



Portable Stove for Campers and Automobilists . . . 469 

 An Exhaust Pipe Heater for a Motorcycle Sidecar 466 

 Right Pressure for Bead Molds in Making Tire 



Repairs 466 



Novel Tank Condenses Boiled-Over Radiator 



Water . . . 513 



Sand the Road If It's Slippery. The Newest Auto- 

 mobile Accessory Does That 513 



Automobiles, Motor-Trucks and Accessoies. . .514-515 



Shifting Gears Automatically 524 



New York Police Uses Wireless 531 



Armored Motor Cars 540 



A Vacuum Automobile Brake 545 



Cleaning Sewers with the Aid of a Motor Truck. . 556 



Increasing the Push of Automobile Engines 560 



The Gasoline Caddy and Errand Boy 566 



Look Out for Automobile Gas — It Is Fatal 568 



Regulating the Automobile Searchlight by a Simple 



Push Button 569 



Grind Your Valves at Home. A Machine Made 



for Car Owners 576 



An Alarm That Warns You of a Leaking Tire. . . 580 

 At Last! An Automatic Motor-Driven Tire Pump 586 

 Automobile Lights Which Turn with the Roads. . 588 

 Removing Carbon from Your Automobile Engine 



with Water 588 



Hitching a Motorcycle to a Buggy 597 



Converting an Automobile Into a Farm Workhorse 598 



Dynamo Lighting System for a Motorcycle 601 



Things to Know About Motorcycle Clutches .... 601 

 Marking Date of Repairs on Automobile Tires . . . 604 

 Re-Shellacking a Cork-Float on an Automobile 



Engine 604 



Housing the Motorcycle 605 



Marking an Automobile for Positive Identification 607 



To Keep Weight of Automobile from Tires 610 



A Lubricator for Automobile Steering Pivots 61 I 



Replacing Old Valve-Stems in Automobile Tires. . 614 

 Using the Automobile Jack to Straighten a Frame 619 

 A Simply Constructed Vapor Plug for Automobile 



Engines < 626 



Don't Soil Your Car Floor 645 



An Electric Signal System for the Automobile .... 684 

 Automobiles, Motor-Trucks and Accessories. . .686—687 



The Army Mule Ambulance 703 



The Circus Motors to Town 709 



A Gasoline Horse 710 



Efficient Truck Loader 711 



The I nside of a Tank 712 



Automobile Contest Winner 720 



A Wire-Mesh Top for the Automobile 727 



A Non-Skid Automobile Device Without Chains. . 729 

 An Electric Semaphore Signal for the Automobile. 735 

 An Automobile Spring which Takes up Shocks. . . 750 



New Valveless Four-Cycle Gasoline Motor 752 



Using Straight Side Tires on Clincher Rims 761 



A Small Single Cylinder Homemade Automobile. . 762 

 Repairing a Broken Carbureter Lever on Automo- 

 bile Engine 769 



Remodeling the Motorcycle 771 



Starting Automobile with Current Taken From 



Another Car , 779 



To Cut Automobile Tire Fabric on an Angle 780 



To Prevent a Motorcycle Theft by Short-Circuit- 

 ing Spark Plug 786 



Another Inventor's Idea for Speeding Up the 



Automobile 805 



An Observation-Tower Car for the Army 837 



Automobiles, Motor-Trucks and Accessories. . .838-839 



Barney Oldfield's Racer 859 



A Good Automobile Whistle 866 



Ploughing the Farm by Automobile 881 



A Combined Automobile Spring and Shock Ab- 

 sorber 887 



Carrying the Cook-Stove on the Automobile Trip 896 



The Double Automobile Spring 914 



Troubles with the Safety Spark Gap on Motor- 

 cycles 922 



Substitute for an Automobile Hub-Cap. 934 



A Telescoping Motorcycle Jack for Road Use 936 



NATURAL SCIENCE Page 



Not Buried — ^Only Encrusted in Snow 7 



The Great Hawaiian Volcano Kilauea 10- 1 1 



Are There Inventors Among the Insects? 20 



Eyes That Were Never Made for Seeing 21 



The Wonderworld of Ice Crystals 23 



How Do Birds Always Know Where They Are? . . 64 



How Do Fish Locate Fresh- Water So Unerringly? 69 



How Life Begins 88 



An Icicle Which "Sprouted" Overnight 92 



What Jack Frost Did with a Fountain of Running 



Water 92 



A Winter Elxperiment with Bulbs 93 



A Tree Root that Resembles a Young Deer 165 



A Wonderful Specimen of a Petrified Bird's Nest. . 188 



Music from the Bowels of the Earth? Yes; in Texas 188 



This River Is One of Nature's Puzzles 191 



We Don't Eat This Unfashionable Fish 205 



Snow: A Curse and a Blessing 225 



Even Bees Should Be Careful Where They Locate 243 

 Are You Interested in Cellar Farming? Let the 



Parasol Ant Instruct You 243 



They Grow Cannon Balls on Trees in South 



America 329 



The Native Homes of Orchids and Dwarfed Pines 336 



Blonde and Brunette Bears of One Species 341 



Making Artificial Leaves 342 



Horse-Collar Grows on a Tree 343 



TransplantingPalmTreesWithout Sacrificing Their 



Foliage •.•••, ^^^ 



The Transformation of a Caterpillar's Foot 428 



The Strangling Fig — A Terror of the Vegetable 



Kingdom 511 



A Redwood as Compared with a Railway Train ... 557 



Sentinel Rocks and Their Story 570 



Nature Supplies Boise with Hot Water 572 



How Did the Crocus Grow in the Bottle? 573 



Do You Know That We Americans Have Over a 



Hundred Volcanoes ? 587 



Telling the Age of Water-Marks on a Lake Shore. . 595 

 Nature Hides a One Thousand-Pound Stone Toma- 

 hawk in a Coal Mine 597 



The "Missing Link" Among the Fishes. 672 



That Cloud— How Fast Is It Drifting? 674 



Why the Tendrils of a Plant Grow in Two Direc- 

 tions 677 



Mystery of Stone Giants 682 



Siamese Twins Among Trees 717 



A Miniature Grove on a Tower 728 



Relics of the Almost Extinct American Buffalo . . . 747 

 Like a Combination Tool Is the Blood-Sucking 



Apparatus of the Horsefly 749 



A Self-Warming River 751 



The Birth of a Butterfly 824 



The Mangrove Shields of the Savages 833 



The Gourd in the Bottle 883 



Natural Curiosities Among the Rivers 889 



A Flowery Conception of the Western Hemisphere 897 

 Grasshoppers Which Fly a Thousand Miles Out at 



Sea 909 



PHOTOGRAPHY AND MOTION-PICTURES 



Giving Body Relief to Motion-Pictures . . ; 28 



Photographing a Bald Eagle 46 



Testing Your Camera Lens 58 



How Life Begins *. 88 



Producing Trick Photographs 104 



How Motion-Picture Statues Are Made Overnight 1 14 

 Avoiding Eye-Strain in Watching Motion-Pictures 1 15 

 Making Storms to Order for Motion-Pictures .... 115 

 Why Wheels Run Backwards on the Motion- 

 Picture Screen 1 20 



The Making of Photographic Silhouettes 127 



Making a Motion-Picture Camera 135 



Photographic Focusing Table for Hand-Cameras. . 143 

 Motion-Pictures Tell South Americans of Our 



Industrial Development 232 



How Are Photographs Made in Natural Colors . . . 254 



Statues that Move. Dance and Fight 257 



Photographing Magnetic Field Lines Without a 



Negative 28 1 



A Model Darkroom 298 



A Faked "War Photograph" 350 



Wooden Guns in Motion-Pictures 379 



The Race Between Nature and the Scientific 



Camera 426 



Motion-Pictures on Glass Plates 433 



Stencils Cut from Discarded Photographic Film . 443 



