• Stock contact, 121.
• Storage, 82.
• Storage battery, 107.
• Storing, 82.
• Substances, 135.
• Sulphate, 55, 128, 133.
• Sulphur, 19.
• Sulphuric acid, 31, 84.
• Sulphuric acid voltameter, 55, 57.
• Superstition, 171, 173.
• Surging, 153, 154.
• Swinging magnet, 53.
• Swinging switch blade, 67.
• Switch blades, 66.
• Switches, 65, 66, 70, 77, 78, 90, 117.
• Switches, bar, 65, 68, 90, 91.
• Switches, bar, parallel, 67.
• Switches, heart-shaped, 78.
• Switches, piece, 77.
• Switches, reversing, 67.
• Switches, sliding, 67, 80.
• Switches, terminal, 8.
• Switches, two-pole, 65.
• System, circuiting, 79.

T

• Tail-piece, 16.
• Tantalum, 169.
• Telegraph, 11, 90, 96.

• Telegraph key, 106.
• Telegraph sounder, 108, 109.
• Telegraphing, 94.
• Telephone, 12, 110, 113, 117, 118, 119, 120.
• Telephone circuit, 118.
• Telephone connections, 116.
• Telephone hook, 122.
• Temperature, 56, 88, 134, 161, 170.
• Tension, high, 38, 102, 184.
• Tension, low, 38, 98, 102, 179.
• Terminal, 31, 34, 35, 40, 48, 82, 86, 93, 95, 107, 116, 121, 122, 151, 152, 153, 154, 156.
• Terminal knob, 31.
• Terminal, secondary, 102.
• Terminal switch, 81.
• Theoretical, 160.
• Therapeutics, 187.
• Thermo-electric couples, 146.
• Thermo-electricity, 135.
• Thermometer, 56.
• Thorium, 169, 186.
• Thunderbolt, 171, 173.
• Tin, 136.
• Tinfoil, 31, 101.
• Tools, 11, 13, 17.
• Torch, brazing, 17.
• Transformer, 145, 146, 158, 159, 180, 182.

• Transformer, step-down, 182.
• Transmission, 38, 187.
• Transmit, 63, 95, 157.
• Transmitter, 12, 120, 121, 122, 123.
• Transverse, 16, 52.
• Transversely, 43.
• Trigger, 75.
• Tripod, 31.
• Tubular, 44, 45.
• Two-pole switch, 65.

U

• Ultra-violet, 185.
• Uranium, 186.

V

• Vacuum, 184.
• Vapor lamps, 169.
• Velocity, 60, 73.
• Vertical armature, 75.
• Vibration, 110, 111, 113.
• Vibratory, 110.
• Vise, 13.
• Voltage, 37, 38, 60, 61, 62, 63, 87, 88, 99, 147, 154, 165, 180, 182.
• Voltage, high, 158.
• Voltaic, 29, 32.

• Voltaic pile, 33.
• Voltameter, 7, 58, 88.
• Voltameter, sulphuric, acid, 55, 57.
• Volts, 60, 62, 87, 89, 132, 158, 159.

W

• Water, 123, 138, 144.
• Water power, 142.
• Watts, 60, 61, 160.
• Wave lengths, 104, 110.
• Weight, 49.
• Welding, 13, 182.
• Winding, 18, 40, 47, 58, 159, 196.
• Winding reel, 14.
• Window connection, 76.
• Window frame, 78.
• Wire, 6, 18, 21, 26, 28, 156.
• Wire, circuiting, 79.
• Wire coil, 40.
• Wire lead, 70.
• Wire, parallel, 28, 49.
• Wireless, 12.
• Wireless telegraphy, 103, 104, 184.

• Wiring, 80.
• Wiring, window, 77.
• Workshop, 11, 17.
• Wound, compound, 48.
• Wound-series, 47.
• Wound-shunt, 47.

X

• X-ray, 184, 185, 187, 188.

Z

• Zinc, 17, 34, 35, 85, 135.
• Zinc plates, 33.