Page:Incandescent electric lighting- A practical description of the Edison system.djvu/82

 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

. 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.