Types of Gas Masks Used by American and European Armies 133 1,500 Tons of Peach-Pits Used for the Manufacture of Charcoal for Use in Gas Masks 134 Testing Respirators Outside the Gas Chamber 135 Testing Gas Masks Inside the Gas Chamber 135 Advancing Under Gas 138 Training for Gas Warfare 139 Cutting Their Way through Barbed-Wire Entanglements while Training with Gas Masks 139 American Salvage Dump in France 192 A Workroom in an American Salvage Depot in France 192 An American Delousing Station 193 An American Laundry in Operation Near the Front 193 A 16-Inch Howitzer 202 A 16-Inch Howitzer on a Railway Mount 203 A Scene in an American Arsenal 214 Filling a Powder-Bag for a 16-Inch Gun 215 An American 75-mm in Action 232 The 37-mm Gun in Action 233 An American 75-mm Field Gun, Tractor Mounted 234 A 12-Inch Railway Gun in Operation 235 A 12-Inch Seacoast Mortar on a Railway Mount 236 6-Inch Seacoast Rifles Taken from Coast Fortifications and Mounted for Field Use in France 237 John M Browning, the Inventor of the Pistol, Rifle, and Machine Gun Which Bears His Name 242 The Browning Heavy Machine Gun 242 A Rifle Grenadier 243 Bombing Practice 288 Eggs of Death 288 Pigeons Have Been Repeatedly Used with Success from Both Airplanes and Balloons 289 The Eye in the Sky; an Airplane Camera in Operation 289 Radio Telephone Apparatus in Operation on an Airplane 300 President Wilson Talking with an Aviator in the Clouds by Means of the Radio Telephone 300 A Range-Finder for Ascertaining the Altitude and Speed of Airplanes 301 A Sentinel of the Skies 306 An American Observation Balloon Leaving Its “Bed” Behind the Western Front 307