B. Balance, Wheatstone's, 97 ---- ----, manipulation of, 99 ---- ----, measurement of resistances by, 98 Barrel torpedoes, 19 Batoum, Russian torpedo boat attack at, 195, 202 Batteries, bichromate, 77 ----, double fluid, 274 ----, firing, 75 Batteries, Leclanché's Voltaic, 77 ----, Menotti test, 79 ----, signalling, 78 ---- ----, Daniell's, 78 ----, single and double fluid, 272 ----, telegraph, 79 ----, Voltaic, 79 ----, Von Ebner's, 76 Battery test for electro-motive force, Voltaic, 105 ---- ---- internal resistance, Voltaic, 104 ---- ---- potential, Voltaic, 104 Beardslee's high tension fuze, 36 ---- joint, 46 Bearings, firing by cross, 70 Bichromate batteries, 77 Boat, Bushnell's submarine, 2, 184 ----, Confederate submarine, 185 ----, experiment at Cherbourg, torpedo, 170 ----, French submarine, a, 185 ----, Lay torpedo, the, 141 ---- ----, capabilities of the, 147 ---- ----, clearing obstructions with the, 151 ---- ----, improved form of the, 153 ---- ----, launching the, 147 ---- ----, method of sinking and raising the, 149 ---- ----, used as a tug, 150 ---- ---- to clear away mines, 152 ----, _Lightning_, Thornycroft's torpedo, 168 ----, torpedo, attack at Batoum, 195, 202 ---- ---- Rustchuk, 200 ---- ---- Soukoum Kaleh, 201 ---- ---- Soulina, 198 ---- ---- off Matchin, 196 ---- ---- the Aluta, 200 ---- ----, the final, 203 ---- ----, attacks, 180, 191 ---- ----, methods of protecting ships against, 180 ---- ----, protective, Fosberry's patent, 182 Boats, submarine, 183 ---- ----, qualifications essential to, 184 ----, torpedo, 162 ---- ----, English, 173 ---- ----, Herreshoff's, 178 ---- ----, ordinary type of, 179 ---- ----, Schibau's Russian, 178 ---- ----, Spanish, 175 ---- ----, Thornycroft's, 163 ---- ----, Yarrow's, 172 Booms, construction of, 110 ----, defence of harbours by, 110 Boots for divers, 261 Boxes, junction, 51 ---- ----, for multiple cables, 52 ---- ---- single cored cables, 52 ----, resistance, 97 Brakes for Harvey's torpedoes, 123 Breaker, the circuit, 62 Breast-plate for divers, 260 Brook's torpedoes, 19 Brown's arrangement of earth plates, 100 Buoys for Harvey's torpedoes, 122 Bushnell, the inventor of torpedoes, 2 Bushnell's drifting torpedoes, 2 ---- mode of ignition, 2 ---- submarine boat, 2, 184