St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 123
Fig. 170. I20 HOW ELKCTRIC CURRENTS ARE DISTRIBUTED. the various smaller wires would become overheated, andperhaps melt or start a fire. An accidental short circuit,for example, would so reduce resistance that too muchcurrent would suddenly rush through the wires. Thereare several devices by which… … Figs. 171 to 175. fuse ivire, placed in the circuit and supported by a porce-lain block. These wires are tested, different sizes beingused for different currents. As soon as there is any tend-ency toward over-heating, the fuse blows; that is, itpromptly melts and opens the circuit before anj…
Electricity
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