E. Earth plates, Browne's arrangement of, 100 Effect compared, explosive force and, 204 Efficiency of Thornycroft's boat engines, 171 Electric cables, creeping for, 112 ---- ----, Hooper's, 41 ---- ----, insulated, 38 ---- ----, insulation test for, 102 ---- ----, jointing, 44 ---- ----, Siemens', 40 ---- ----, Silvertown, 41 ---- circuit, closing the, 60 Electric circuit, the, 267 ---- fuses, 33 ---- lamps, automatic, 248 ---- ----, Siemens' patent, 248 ---- light apparatus, Siemens', 241 ---- ----, conducting wires for, 247 ---- ----, light produced by, 244 ---- ----, rotation of armatures in, 246 ---- ----, wear and tear of, 247 ---- ----, application of the, 256 ---- ----, concentration of the, 251 ---- ----, precautions in manipulating, 252 ---- ----, self-acting shunt for Siemens', 245 ---- ----, the, 239 ---- machine, description of a frictional, 278 ---- machines, methods of coupling dynamo, 254 Electrical resistance of cables, test of the, 104 ---- resistances, measuring, 93 ---- submarine mines, 10, 27 ---- ----, advantages of, 28 ---- ----, defects of, 22 ---- ----, mooring, 54 ---- ----, rules for using, 29 ---- test of insulated joints, 104 ---- testing, Armstrong's system of, 107 ---- tests, 85 Electricity, frictional, 278 ----, methods of generating, 269 ----, theory of, 265 Electro-contact mines, circuit closers for, 63 Electrolytes, 271 Electro-positive and electro-negative, the terms, 271 Electro-magnet, the, 281 Electro-mechanical mines, Russian, 68 Electrometers, 86 ----, Thomson's quadrant, 86 Electro-motive force, 270 ---- ----, Voltaic battery test for, 105 ---- forces, comparing, 94 Employment of torpedo ships, the, 158 Engines, efficiency of Thornycroft's boat, 171 England, torpedo experiments in, 222 English service platinum wire fuse, the, 33 ---- torpedo boats, Yarrow's, 173 Ericsson's torpedo vessel _Destroyer_, 160 Experiment at Cherbourg, torpedo boat, 170 ---- with a torpedo boat, flotation, 171 Experiments, Abel's detonation, 216 ---- by Professor Abel, 207 ---- ---- Roux and Sarrau, 207 ----, Colt's torpedo, 7 ----, Fulton's practical, 5 ----, torpedo, at Carlscrona, 220, 224, 232 ---- ---- Chatham, 220 ---- ---- Copenhagen, 223 ---- ---- Kiel, 222 ---- ---- Pola, 231 ---- ---- Portsmouth, 229, 233 ---- ----, Fulton's French, 3 ---- ----, in Austria, 220 ---- ---- England, 222 ---- ---- Turkey, 232 ---- with countermines, 235 ---- ---- at Carlscrona, 237 ---- ---- Stokes Bay, 236 ---- ---- in the Medway, 236 Explosion, definition of the term, 204 Explosive agents, torpedo, 217 ---- compounds, 208 ---- force and effect compared, 204 ---- ----, definition of the term, 204 ---- mixtures, 208 ---- substance, physical state of the, 204 Explosions, illustrated torpedo, 218 Extempore drifting torpedoes, American, 119 ---- high tension fuzes, 37