P. Papier maché safety plug, McEvoy's, 22 Paraguayan war, torpedo operations during the, 191 Passage through torpedo defences, clearing a, 111 Passive obstructions, destruction of, 113 Patent electric lamp, Siemens', 248 ---- torpedo boat protective, Fosberry's, 182 Percussion fuzes, 23 ---- ----, McEvoy's, 24 Permanent joint, Siemens', 47 ---- magnets, 280 Physical state of the explosive substance, the, 204 Picric powder, 209 Planting submarine mines, rules to be observed in, 74 Plates, Brown's arrangement of earth, 100 ----, connections of switch, 100 Platinum wire fuze for conductivity, test of, 101 ---- ----, test of resistance of, 101 ---- ---- fuzes, 33 ---- ----, English service, 33 ---- ----, McEvoy's, 34 _Plongeur_, French submarine boat, 185 Plug, Mathieson's cement safety, 21 ----, McEvoy's papier maché safety, 22 Pola, torpedo experiments at, 231 Polarization, definition of the term, 273 Porter's torpedo ship _Alarm_, Admiral, 159 Portsmouth, torpedo experiments at, 229, 233 Potential, definition of, 270 ----, Voltaic battery test for, 104 Powder, Horsley's, 216 ----, picric, 209 Precautions in manipulating the electric light, 252 Primer, Abel's mechanical, 23 ----, McEvoy's, 21 Projecting frames for torpedo ship defence, 111 ---- Whitehead's fish torpedo, methods of, 138 Propeller, Thornycroft's screw, 170 Properties of a Voltaic cell, definition and, 269 Prussian system of firing by observation, the, 73 Q. Quadrant electrometers, Thomson's, 86 Qualifications essential to submarine boats, the, 184 R. Rain's detonating composition, 23 Reflecting galvanometer, Thomson's, 87 Reflector, Colt's, 7 Remarks on offensive torpedoes, general, 156 Resistance boxes, 97 ---- of cables, test of electrical, 104 ---- platinum wire fuze, test of, 101 ----, Voltaic battery test for internal, 104 Resistances by Wheatstone's balance, measurement of, 98 ----, circuit, 276 ----, measuring electrical, 93 Rheostat, the, 96 Rope mooring, single, 56 Rotation of armatures in Siemens' electric light apparatus, 246 Roux and Sarrau, experiments by, 207 Rules in connection with submarine mines, 29 ---- to be observed in forming cable joints, 51 ---- ---- planting mines, 74 Russian and Turkish offensive torpedo operations, 194 ---- defensive torpedo operations, 193 ---- electro-mechanical mines, 68 ---- torpedo boat attack at Batoum, 115, 202 ---- ---- Matchin, 196 ---- ---- Rustchuk, 200 ---- ---- Soukoum Kaleh, 201 ---- ---- Soulina, 198 ---- ---- off the Aluta, 200 ---- ----, the final, 203 ---- ---- boats, Schibau's, 178 ---- ---- launch, Yarrow's, 172 ---- torpedoes, 193 Russo-Turkish war, torpedo operations during the, 192 ---- ----, torpedoes during the, 14, 115 Rutschuk, Russian torpedo attack at, 200