Calthrop, E. R., 300, 311 Canet, Gustave, 129 Canvas boats, 86 Carbolic acid, 35 Carbon, 28, 50, 94, 98 Carbon in steel, 106 Carbon monoxide, 95 Carriages of guns, 116 Cast iron, 96, 97 Catamaran bridge, 90, 91 Caustic soda, 22, 23, 24 Chloride of lime, 23 Chlorine, 18, 19, 21, 23, 52 Chloroform, 59 Clerk-Maxwell, Professor J., 243 Coal dust explodes, 29 Coal tar, 34 Contact-firing mines, 65 Copper, 147 Cordite, 36 Cotton explosives, 32, 33 Countermining, 63, 73 Crucible steel, 104 Curie, Madame, 41 Detonator, 37 Diastase, 55 Diesel engine, 178, 236 _Dreadnought_, H.M.S., 194 Driving-band on shells, 142 Dynamite, 31 Electricity, positive and negative, 20, 21 Electrodes, 19 Electrolysis of salt, 18, 19 Electrolyte, 19 Electrons, 42 Electroscope, 43 "Elia" mines, 70 Ethane, 51 Ether, 58, 59 Explosion, force of, 30 Field guns, 108, 114 Flotilla leaders, 189 Fractional distillation, 35, 57 French field artillery, 108 Froude, William, 203 Fulminate of mercury, 37 Glycerine, 25 Gravity, action of upon shells, 122, 123, 124 "Guardian Angel" parachute, 300 Gun-cotton, 32, 33 Gunpowder, 27, 30 Gyroscope, uses of, 216, 234 Helium, 42 Hertzian waves, 243 High explosives, 36, 138 High-explosive shells, 137 High-speed steel, 105 Hop-pole bridges, 88 Horse artillery, 108, 114 Howitzers, 111, 114, 115 Hydrostatic valve, 68, 217 Hydroxyl, 52, 53 "Interference" of waves, 241, 248 _Invincible_, H.M.S., 196 Ionogens, 20 Ions of common salt, 19 Iron ore, 93 Kieselguhr, 32 Ladysmith, guns at, 109 Launching a ship, 211 "Limit" gauges, 140 Line-of-battle ships, 191 _Lion_, H.M.S., 197 Lyddite, 35 Machine guns, 115 Magnetic detector, 257 Malt, 55 Marconi, 248 Methane, 51 Methylated spirit, 54 Mine, submarine, 63 _et seq._ Mine, subterranean, 61 Mortars, 111, 112, 113, 114, 118 Naval guns, 112, 120 _et seq._ Naval shells, 136, 137 Nitrate of potassium, 30 Nitro-benzene, 35 Nitro-glycerine, 26, 31, 32 Nitrogen, action of, 26, 30 Observation mines, 65 Oil fuel, 177 _Olympic_, s.s., 197 Organic substances, 26 _Orion_, H.M.S., 193 Parachutes, 297 Paraffins, 51 Periscope, 225, 233 Petrol engine, 181, 182 Phenol, 35 Picric acid, 35 Pig iron, 95, 97 Poison gas, 23 Pontoons for bridging, 77 Propellants, 36, 125, 138 Radio-activity, 41 Radium, 39 _et seq._ Rays from radium, 41, 42 Reeds, bridges made of, 85 _Repulse_, H.M.S., 192 Rheumatism and radium, 47 Rifling in guns, 143 Rolling mills, 98, 139