St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 48
is open, as shown. To close the circuit, the arm is pushed over until it presses down upon the contadt-point. For neatness, both wires are joined to the under side of the switch or to binding-posts. Fig. 57 shows a knife switch. Copper blades are pressed down between copper spring clips to close… … 46 PUSH-BUTTONS, SWITCHES AXD BINDING-POSTS.
Electricity
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