INDEX

Air, fighting waves, 334 raising ship, on, 319 war in, 123

Airplane, ambulance, 146 armored, 139 artillery-spotting, 131 camera, 173 cartridges, 131 classes of work, 127 fighting among clouds, 137 flying boats, 144 gasolene tank, 130 giant, 132 hospital, 146 launching from ship, 303 Liberty motor, 142 scouting, 125 scouts, 128 speed of, 134 spotting, 177 training spotters, 180 wireless telephone, 194 See also Seaplane

Ambulance airplane, 146

Armored diving-suit, 330

Arms and armor, 111

Artillery, hand, 23

Atmosphere, shooting beyond, 64

Audion, 185

Balloon, Blimp, 260 helium, 164 historical, 148 hydrogen, 150

Balloon, kite, 174 principles, 150 record flight, 65

Barbed wire, 15 cylinders, 17 gate, trench, 9 gates through, 15 shelling, 16

Barge for towing seaplanes, 302

Barrage, grenade, 27 mine, 292

Battle-fields, miniature, 180

Blimp, 260

Blisters on ships, 307

Boats, electric, 308 Eagle, 301 flying, 144 surface, 298

Bombs to destroy barbed wire, 16

Breakwater, pneumatic, 335

Browning, John M., 56

Buildings, shadowless, 227

Caisson disease, 325

Caliber, 68

Camera, airplane, 173

Camouflage and camoufleurs, 211 buildings, 227 grass, 229 horse, 223 land, 222 roads, 225

Camouflage, ships, 211

Cartridges, aircraft guns, 131

Catapults, 36

Caterpillar tractor, 109

Caves, 8

Coffer-dam, salvage, 318

Color, analyzing, 229 screens, 229

Compass, wireless, 201

Convoy, 267

Countermines, 17

Deep sea, conditions in, 312

Deep water diving, 327

Depth bombs, 265

Devil's eggs, 276

Diesel engine, 240

Direction-finder, 205

Dirigible, see Balloon

Disease, caisson, 325

Diver, armored suit, 330 caisson disease, 325 rest chamber, 328 sled, 330 submarine torch, 329 suit, 324

Diving, deep, 324 record depth, 327

Duck-boards, 9

Dugouts, 7

Dummy heads of papier mâché, 13

Eagle boats, 301

Egg-laying submarines, 287

Eggs, Devil's, 276

Electric motor-boat, 308

Engine, Diesel, 240

Field-guns, 81

Fire broom, 105 liquid, 103

Forts, machine-gun, 58

Fuse, grenade, 28

Gas, 85 American, 102

Gas attack, boomerang, 92 first, 89

Gas, chlorine, 87 diphosgene, 96 exterminating rats, 94 grenades, 26 helium, 164 hydrogen, 150 lock, 97 masks, 99 mustard, 98 phosgene, 93 pouring like water, 86 shell, 95 sneezing, 98 tear, 95 vomiting, 98

Gasolene-tank, airplane, 130

Gate, barbed wire, trench, 9

Gates through barbed wire, 15

Gatling gun, 43

Geologists, Messines Ridge, 19

Glass, non-shattering, 100

Grapnel shell, 16

Graveyard, submarine, 314

Grenade, disk-shaped, 33 fuse, 28 gas, 26 hair brush, 34 history of, 23 Mills, 29 parachute, 31 range of, 25 rifle, 28 throwing implement, 27

Grenade, wind-vane safety device, 32

Gun, aircraft, 131 American, 50-mile, 63 big, hiding, 226 caliber, 68 disappearing, 77 double-end, 145 18-inch, monitors, 306 elastic, 73 field, 81 42-centimeter, 79 how made, 76 120-mile, 70 long range, German, 62 non-recoil, 145 on submarine, 249 16-inch, coast defense, 78 Skoda, 81 spotting by sound, 181 three-second life, 73 12-inch, submarine, 251 ways of increasing range, 67 wire-wound, 76

Hand-grenade, see Grenade

Helium, 164

Hospital, airplane, 147

Horizon, seeing beyond, 219

Howitzer, 79

Hush ships, 304

Hydroaëroplanes, see Seaplanes

Hydrogen, weight of, 150

Hydrophone, 270

Illusions, optical, 215

Kilometer, length in miles, 6

Kite balloons, 174

Kite, water, 283

Liberty motor, 142

Liquid-fire, 103

Locomotives, gasolene, 10

Lusitania, 316

Machine-gun, 112 airplane, 127 Benèt-Mercié, 52 Browning, 53 Colt, 44 forts, 58 Gatling, 43 history, 41 Hotchkiss, 49 Lewis, 50 Maxim, 42 water-jacket, 47 worth in rifles, 58

Machine-rifle, 55

Magnets, lifting, salvage, 334

Maps, making with camera, 175

Marne, first battle of, 4

Messines Ridge, mine, 19

Metal-cutting under water, 329

Microphone detectors, mines, 18

Mine-field, North Sea, 290

Mine laying, North Sea, 292

Mine-laying submarine, 287

Mine railroad, 294

Mine-sweeping, 281

Mines, 276 anchored, 278 and counter-mines, 17 automatic sounding, 278 drift of, 285 electric, 277 floating, 284 Messines Ridge, 19

Mines, paravanes, 288

Monitors, 306

Mortars, 79 depth bomb, 266 flying, 23

Mortars, See also Trench mortars

Mother-ships for airplanes, 305

Motor-boat, electric, 308 sea Tank, 299

Motor torpedo-boats, 298

Mystery ships, 220

Net, North Sea, 290

Ocean currents, 285

Optical illusions, 215

Oxy-hydrogen torch, submarine, 329

Paint in war, 209

Papier mâché heads, 13

Papier mâché horse, 223

Parachute, 175 grenade, 31 search-light shell, 84

Paravanes, 288

Periscope, submarine, 244 trench, 11

Pill-boxes, 59

Pneumatic breakwater, 335

Pontoons, salvage, 320

Propeller, shooting through, 136

Radio, see Wireless

Railroad, mine, 294

Railways, trench, 10

Range-finder, 170

Range, getting the, 169

Range of guns, increasing, 67

Range, torpedo, 213

Rats, freeing trenches of, 94

Rifle grenade, 28 safety device, 32

Rifle, machine, 55

Rifle stand, fixed, 14

Roads, camouflage, 225

Salvage, 310 diving, 324 ice-tongs, 334 lifting-magnets, 334 methods, 317 pneumatic, 319 pontoons, 320 shackles on ships, 333 submarine F-4, 321 submarine sphere, 332

Scouts, airplane, 128

Sea, deep, conditions, 312

Sea gulls finding submarines, 258

Sea lions locating submarines, 259

Sea tank, 299

Seaplane, 143 automatic, 145 submarine patrol, 259 torpedo, 145 towing-barges, 302

Search-light shell, 84

Shackles, salvage, 333

Shadowless buildings, 227

Shell, gas, 95 grapnel, 16 search-light, 84 shrapnel, 83 Stokes mortar, 39

Shield on wheels, 114

Ships, airplane, 304

Ships, blisters, 307 camouflage, 211 "clothes-line," 220 convoy, 267 hush, 304 making visible, 230 monitors, 306 mystery, 220 railroads on, 294 sunk by submarines, 310

Ships, see also Salvage

Shrapnel shell, 83

Sled, submarine, 330

Smoke screen, 262

Sniper, locating, 13

Sniperscopes, 12

Sound, detecting submarines, 269

Sound detectors, mines, 18

Sound, spotting by, 181

Sphere, salvor's submarine, 332

Spotting by sound, 181

Spotting gun-fire, 177

Submarine, blindness, 244 chasers, 255 construction, 234 depth bombs, 265 egg-laying, 287 engines, 246 F-4, salving, 321 getting best of, 253 graveyard, 314 guns on, 249 history, 232 hydrophone, 270 mine-field, 290 mine-laying, 287 net, 290 oil-tank, 236 periscope, 244 reclaiming victims of, 310 rest chamber, 328 salvage vessel, 332 sea-gulls, 258 sea-lions, 259 seaplanes, 259 ships sunk, 310 sled, 330 steam-driven, 250 torch, 329 torpedo, 246 12-inch gun, 251 vs. submarine, 269

Super-guns, 62

Tank, 107 American, 122 flying, 139 French, 119 German, 120 one-man, 114 sea, 299 small, 121

Telegraphy, rapid, 199

Telephone, New York to San Francisco, 186 wireless, 178

Titanic, 314

TNT (trinitrotoluol), 18

Torch, submarine, 329

Torpedo, 299 boats, motor, 298 electrically steered, 308 construction, 246 getting range, 213 proof ships, 306 seaplane, 145

Towing-barge, seaplane, 302

Trajectory, 22

Trench, gas-lock, 97

Trench mortar, 36 pneumatic, 37 Stokes, 38

Trench railways, 10

Trench warfare, 4

Trenches, 21 barbed wire gates, 9 duck-boards, 9

Tunnels, mines, 17 to observation posts, 12

U-boats, see Submarines

Villages, underground, 7

Walking-machine, 108

War, paint, 209

Water kites, 283

Waves, fighting with air, 334

Wireless compass, 201 spy detector, 200

Wireless telegraph, rapid, 199

Wireless telegraphy explained, 188

Wireless telephone, 178 airplane, 184

Wireless telephony across Atlantic, 192

Woolworth Building, falling from, 135

Wrecks, see Salvage

Zeppelin and Lowe's balloon, 149

Zeppelin balloon, construction, 156

Zeppelin, suspended observer, 162

Zeppelin's failures and successes, 154