St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 119
Il6 HOW BLECTRIC CURRENTS ARE DISTRIBUTED. and a similar one leading it out of the house again to the other main. In large buildings, pairs of wires, called risers, branch out from the servicewires and carrj^ the cur-rent up through thebuilding. These havestill other branches —floor mains, etc.,… … Fig. 159.
Electricity
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