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Things a boy should know about electricity (1900)
St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 124
thpure gutta-percha. These are then surrounded by hempen yarn or other elastic material,and around the whole areplaced galvanized iron armorwires for protecftion. Eachcore, or condudlor, contains aconducftor consisting of asingle copper wire or a strandof three or more twistedcopper wires. 144.… … Fig. 177- 122 HOW ELECTRIC CURRENTS ARE DISTRIBUTED. used to produce light, heat, power, etc. For lightingpurposes this is accomplished in two principal wajs. Fig. 178 .shows a number of lamps so arranged, inseries, that the same current passes through them all. + ♦—© (Q-Electricity
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