L. Ladder for divers, 261 ---- mooring, 55 Lamps, automatic electric, 248 ----, Siemens' patent electric, 248 Land service cables, 43 Launch, description of a Yarrow torpedo, 172 ---- for placing moorings, steam, 58 Launches, Thornycroft's torpedo, 163 ---- ---- Austrian and French torpedo, 165 ---- ---- Dutch and Italian torpedo, 168 ---- ---- French torpedo, 169 ---- ---- Norwegian torpedo, 163 ---- ---- Swedish and Danish torpedo, 165 ----, Yarrow's Dutch torpedo, 173 ---- ---- Russian torpedo, 172 Launching Harvey's torpedo, mode of, 123 ---- Lay's torpedo boat, 147 Law, the application of Ohm's, 276 Lay's torpedo boat, 141 ---- ----, an improved form of, 153 ---- ----, capabilities of, 147 ---- ----, launching, 147 ---- ----, method of sinking and raising, 149 ---- ----, used as a tug, 150 ---- ----, in clearing obstructions, 151 ---- ----, to clear away mines, 152 Leclanché's Voltaic battery, 77 Lewis's drifting torpedo, 117 Leyden jar, the, 279 Light, Siemens' electric, 241 ---- ----, conducting wires for, 247 ---- ----, concentration of, 251 ---- ----, precautions in manipulating, 252 ---- ----, rotation of armatures in, 246 ---- ----, wear and tear of, 247 ----, the electric, 239 ---- ----, application of, 256 _Lightning_, Thornycroft's torpedo boat, 168 Lithofracteur, 216 Locomotive torpedoes, 131 Loss of the _Cairo_, 189 ---- ---- _Commodore Jones_, 189 M. Machine, description of a frictional electric, 278 ----, Siemens' low tension dynamo-electric, 75 Machines, methods of coupling dynamo-electric, 254 Magnet, the electro, 281 Magnetism, 279 Magneto circuit closer, McEvoy's weight, 66 Magnets, permanent, 280 Main system, McEvoy's single, 283 Manipulation of Wheatstone's balance, the, 98 Marié-Davy battery, description of the, 275 Matchin, Russian torpedo boat attack at, 196 Material, Hooper's insulating, 39 Mathieson's cement safety plug, 21 ---- circuit closer, inertia, 61 ---- ----, improvements in, 63 ---- ----, spiral spring, 63 ---- joint, 45 McEvoy's drifting torpedo, 118 ---- duplex spar torpedo, 154 ---- improved Singer's mine, 20 ---- joint, 46 ---- mechanical mine, 22 ---- ---- primer, 21 ---- ---- Turk's head, 53 ---- mercury circuit-closer, 65 ---- papier maché safety plug, 22 ---- percussion fuzes, 24 ---- platinum wire fuzes, 34 ---- single main system, 283 ---- weight magneto circuit-closer, 66 Measurement of resistance by Wheatstone's balance, 98 Measuring electrical resistances, 93 ---- the intensity of a current, 95 Mechanical mines, 10, 16 ---- ----, advantages of, 17 ---- ----, best kinds of, 17 ---- ----, extempore, 21 ---- ----, for coast defence, 16 ---- ----, in the American war, 16 ---- ----, McEvoy's, 22 ---- ---- improved Singer's, 20 ---- ----, mooring, 26 ---- ----, Russian electro, 68 ---- ----, Singer's, 19