Things a Boy Should Know About Electricity / Second Edition

by Thomas M. St. John

Fig. 57.

Fig. 58.

Fig. 59.

Switchboards are made containing from two or three to hundreds of switches, and are used in telegraph and telephone work, in electric light stations, etc., etc. (See Chapter on Central Stations.) Fig. 60 shows a switch used for incandescent lighting currents.

Fig. 60.

Fig. 61.