Small, Sidney Aylmer, 1876- [from old catalog] · Chicago, F. J. Drake & co · leaf 145
Fig. 62. Low Voltage Arrester Disconnecting Switches. Single forRailroad work. Double for Electric Lighting. Question 10. Is there not danger in the men inspect-ing the arresters ? Answer. Disconnecting switches as shown in Figs. 62and 63 are installed in places where some other switchwill not… … Fig. 63. High Voltage Disconnecting Switch for Arrester. LESSON 10. Magnetism. introduction. The natural magnet has been known for ages. TheEgyptians and Greeks in their writings long before theChristian era mentioned that a certain mineral attractediron and steel. They also knew that a piece of…
Electricity
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