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
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