INDEX TO VOLUME 91 



Page 

 The Poison Gases that Kill Men in Trench Warfare 24 



Big Steel Guns and How They Are Made 38 



A New Caterpillar Truck 57 



A Submarine's Trip on Land 58 



Fire-Crackers to Ward Off Submarines 59 



Our Unsinkable Cargo Fleet 63 



An Inverted Periscope Used Under Water 68 



The Shoe Hospital of the Allies 61 



California's Conception of a "Tank" 67 



Millions Spent for Shells 70 



A Signal Gun 71 



Conserving Wheat with Alfalfa 72 



An Electric Rammer 80 



Motor-Boats for Submarine Chasers 82 



Dummy Guns Train England's Gunners for the Sea 94 

 To Save Money During War Time Why Not All 



Dress Alike 1 00 



The U. S. Armies Prepare to Fight Germs 106 



Protecting the British Fleets with Chain-Nets. ... 112 



Separating Russian Prisoners from Vermin 119 



Drag-Bombing Submarines with Airplanes 163 



Handling a Submarine 1 68 



The Time Fuse and How It Works 192 



Antiseptic, Anaesthetic Bayonet 216 



A New French Word "Camouflage" 217 



The Onerous Task of Rejecting Recruits 218-219 



The New French "37" 220 



A Great Map of Warring Europe 222 



An Automobile-Mounted Machine-Gun 226 



How the Germans Mutilated Their Boats 230 



The Largest American Flag .' 245 



A New Method of Foiling Bomb-Droppers 247 



Applying the Idea of the Needle Bath in Shell- 1 



Making. 248 



An Army Tool-Shield 266 



Figures That Give An Idea of the Task of Trans- 

 porting Our Armies 27 1 



Why Not the Land Torpedo? 323 



A Target Which Answers 349 



A Visor for the Helmet 350 



The Marines Sleep on Their Life-Prese. vers 354 



Hurling Barbed Wire at the Enemy 355 



The Primer of the Giant Shell 36 1 



The Biggest Red Cross Flag 369 



Details Involved in Making Shrapnel 369 



Target Practice with Coast Defense Guns 369 



Moving a Piano Across the Sahara 378 



Desert Sandshoes 379 



The Mother of the Submarine 380 



Italian Soldiers Paint Their Faces 382 



Rifle-Firing Kinks Taught West Pointers 383 



Body Armor for the Soldier 389 



Newspaper Torches 390 



Testing the Hearing of a Soldier. 392 



Revolver Machine Gun 393 



How the U-Boats Get Through the Nets . 395 



Khaki Has Been Used Since 1848 401 



All Around a Battleship 402 



The War Dress of the New Guinea Soldiers 406 



Demolishing Cottages with a Battering Ram 409 



The Detonator Head 419 



A Million Dollars a Year to Paint Our Navy 424 



Thrusting Spears for Cavalry 430 



Military Marching for Beginners 475 



Is This the Machine-Gun of the Future? 483 



Three Million Pairs of Shoes Ordered for the Army 507 

 Firing Shells Charged with Gasoline Which Ignites 



on Impact 507 



Will the Shell Burst When It Is Fired? 513 



The New Enfield Rifle 518 



A Shock Absorber for the Soldier's Kit 521 



Statistically, What Is Your Chance of Being Killed 



in This War? 532 



The Camouflage Soldier 533 



Saving the Food Cargo of a Torpedoed Ship 540 



Forty-Three Bombs in a Freight Car of Scrap 



Iron . 542 



The "Red Cross" for the Soldiers; the "Red Star" 



for Their Steeds 544 



The Carrier Pigeon Still Holds Its Own as Trusted 



Messenger 554 



Shoot or Stab This Dummy, and an Explosion 



Occurs 555 



Megaphoning the Reveille 568 



Fighting a Gas Attack in the Trenches 580 



Moving Targets to Quicken the Eye and Steady the 



Aim 585 



What You Will Need When You Go to Training ** 



Camps 596 



Gun-Buoy for Repelling Submarines 643 



A Merry-Go-Round for the German Soldiers .... 644 



A Leopard Ship of the Sea 645 



A Versatile "Helmet 646 



Cowards in the Armv Are Rare 646 



Fighting at Night with Searchlight Torpedoes. . . . 680 



What's Wrong with the Submarine? 682 



Medical Men in the Army 685 



Packing Chocolate in Sausage-Links 685 



Shells with Scissors Attachments That Cut Wire 



Entanglements 686 



Portable Army Bread-Mixer 689 



Catapulting Seaplanes from U-Boats 696 



Identification Rings for Soldiers 699 



A Shoe-Repairing Truck for the Army 700 



Guarding Venice 706 



The New Service Flag 707 



Assembling Torpedos 717 



A Temporary Tombstone for the Unexploded Shell 721 



Paper Uniforms for German Soldiers 728 



A Bullet That Flies Like a Comet 729 



The Machine-Gun Principle Applied to the Revolver 730 



Eliminating the Periscope from the Submarine. . . 731 



Men Who Ought to Make Good Rifle Shots 732 



Business Is Booming in War Horses and Mules. . . 736 



Three Shots with a Single Shell 739 



Will a Projectile Fly True? 743 



A French "75" Anti-Airplane Gun with a Camou- 

 flage Dressing 744 



How a Fighting Dummy Teaches Men to Use the 



Bayonet 824 



Steel Castings for Modern Dreadnoughts 827 



Reaching the Soldiers, Wounded Far Up in the 



Mountains 839 



The Unsinkable Submarine 840 



The Possibilities of a 60-Inch Gun 844 



Testing Shells for Hardness 847 



The French "Horizon Blue" Is the Best Color for 



Uniforms . . 848 



What Defective Ammunition Means 849 



New Motor Truck Kitchen 851 



Blinding the Enemy with Searchlights 859 



A Bomb in a Piano 865 



Dummy Airplane Targets 866 



A German Military Obstacle 869 



The Latest Sea Camouflage 876 



Protecting Battleships with Compressed Air 886 



German Trenches as Comfortable as Houses 889 



England's Great Under-Sea Walls of Bombs 915 



MOTOR VEHICLES AND THEIR 

 ACCESSORIES 



A Hint to Motorists — Keep Your Radiator Clean 7 



Differentiator Motor Vehicles 30 



Automobiles, Motor-Trucks and Accessories. . . .34-35 



Measuring Motor-Truck Loads Automatically. ... 36 



The Youngest Manufacturer of Automobiles 48 



A Solution to Tire Troubles 58 



Auto Engine Cooler on Steam Ejector Plan 62 



Transforming an Auto Roadster into a One-Ton 



Truck 73 



A Ten-Ton Motor-Truck on Eight Wheels 88 



A New Type of Transmission Employs Cork Inserts 1 00 



The Problem of the Automobile Top :••.••• '02 



A Community Garage Comprises Fifty Buildings 



on One Lot Ill 



Making the Acetylene Light as Brilliant as the 



Electric Lamp 120 



Combined Ice-Box, Pantry and Trunk for Autos. . 165 

 Testing a Car's Power to Pull Itself Out When 



Stuck 167 



A First Assistant to the Motorcycle Cop 169 



The Automobilist's Mechanical Cost Keeper 186 



A Folding Crib in the Automobile and Summer 



Camp 191 



A Funnel Will Fill Up Your Automobile Tank 



Without Spilling the Gasoline 193 



Automobiles, Motor-Trucks and Accessories. . . 194-195 



Convenient Automobile Doors 224 



Automobile Run on Alcohol 229 



The Cost of French Army Cars 233 



A Keyless Lock for Your Ford 236 



Auto Engine Cooler Operates on Steam Ejector 



Plan 246 



