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Electricity for Boys

Chapter 44: U

By James Slough Zerbe

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About This Book

A practical manual aimed at young readers that explains electrical principles and hands-on construction of apparatus. It opens with a brief historical overview, then recommends workshop layout, tools, and safety precautions before guiding readers through building magnets, coils, armatures, batteries, and simple dynamos. It presents methods for detecting and measuring current, explains units such as volts, amperes, ohms, and watts, and describes common experiments and construction techniques with many illustrations. Emphasis is on progressive, step-by-step instruction to develop practical understanding, while warning that some demonstrations can be hazardous.

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.