, 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.

Wo