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are to be used. Those with which the public are most familiar are shown in Fig. 24.
They consist of a spindle mounted on a non-conducting base, and having arranged upon it a metallic piece, which, by turning the handle attached to the spindle, is brought into contact with metallic pieces to which the line wires
Fig. 24.
are secured by suitable binding screws thus closing the circuit.
The spindle is turned against the stress of a spring, so as to break the circuit quickly, when, by rotating the spindle, the bar mentioned is released from the metallic line wire contact-pieces. These switches are made of different sizes for carrying different strengths of current.
