Motion picture projection : an elementary text book (1928)

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MOTION PICTURE PROJECTION 31 from the generator at the central station are brought to the lamp, motor, or heating device to be supplied, and the flow of current to this device controlled by means of a switch. The switch consists of pieces of metal which may be brought into contact when desired. The operation of the switch makes or breaks the contact. One handle Fig. 1 may control two switches, so that with one motion the circuit can be broken at two places. The switch may be located on the wall and be of any one of a number of different forms, such as the "snap switch," the "push-button s witch," and the "knife switch." The switch may be located in the socket which holds the lamp ; such a socket is called a "key socket." It makes no difference at