Mechanical primer, Abel's, 23 ---- ----, McEvoy's, 21 ---- tests, 85 Medway, experiments with countermines in the, 236 Menotti cell, description of the, 78 ---- test batteries, 79 Menzing's towing torpedo, 130 Mercury circuit-closer, McEvoy's, 65 ----, fulminate of, 215 Metallic joint, Nicholl's, 45 Method of carrying fish torpedoes, Thornycroft's, 140 ---- ---- sinking and raising Lay's torpedo, 149 ---- ---- testing, the Austrian, 109 Methods of attack with Harvey's torpedoes, 121 ---- ---- coupling dynamo-electric machines, 254 ---- ---- generating electricity, 269 ---- ---- protecting ships against torpedo attacks, 180 ---- ---- projecting Whitehead's fish torpedo, 135 Mines, submarine, electrical, 10, 27 ---- ----, advantages of, 28 ---- ----, defects of, 29 ---- ----, mooring, 54 ---- ----, in the American war, 27 ---- ----, electro-contact, circuit-closers for, 63 ---- ----, Fulton's stationary, 5 ---- ----, mechanical, 10, 16 ---- ----, advantages of, 17 ---- ----, extempore, 21 ---- ----, McEvoy's, 22 ---- ----, improved Singer's, 20 ---- ----, mooring, 26 ---- ----, Russian electro, 68 ---- ----, Singer's, 19 ---- ----, rules to be observed in planting, 74 ---- ----, sweeping for, 112 Mixtures, explosive, 208 Mode of firing Harvey's torpedoes, 121 ---- ----, in 1829, 6 Monitor _Duba Saife_, destruction of the Turkish, 197 Mooring, Austrian method of, 56 ---- electrical submarine mines, 54 ----, fore and aft, 56 ----, ladder, 55 ----, launch for placing, 58 Mooring mechanical mines, 26 ----, single rope, 56 Morse firing keys, 81 Multiple cables, 43 ---- ----, junction boxes for, 52 N. Nicholl's metallic joint, 45 Nitro-glycerine, 209 Nordenfelt torpedo gun, the, 257 Norwegian torpedo launches, Thornycroft's, 163 O. Observation, firing by, 69 ---- ----, Prussian system of, 73 Observing telescope, shutter apparatus and, 84 Obstructions, destruction of passive, 113 ----, Lay's torpedo in clearing away, 151 Offensive torpedo operations, Russian and Turkish, 195 ---- ---- warfare still in its infancy, 115 ---- torpedoes, failure of, 8, 11 ---- ----, general remarks on, 156 Ohm, definition of the, 281 Ohm's law, application of, 276 Operations, torpedo, 187 ---- ----, during the American civil war, 189 ---- ---- Austrian war, 192 ---- ---- Austro-Italian war, 188 ---- ---- Crimean war, 187 ---- ---- Franco-German war, 192 ---- ---- Paraguayan war, 191 ---- ---- Russo-Turkish war, 192 ---- ---- defensive, Russian, 193 ---- ----, Turkish, 193 ---- ---- offensive, Turkish and Russian, 195 Ordinary type of torpedo boat, the, 179 Ottoman fleet, cause of failure of the, 14 Outrigger torpedoes, spar or, 154