Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems (1921)
Smith, Arthur Bessey, b. 1875, Campbell, Wilson Lee · New York : McGraw-Hill · leaf 272
Fig. 215.—Sequence switch and cam. cam, of which a sample is shown at the right. Four stationary springsor brushes engage each cam, and the metal mounted on it. By it manycomplicated connections can be made and broken during the progress of … Fig. 216.—General view of panel type switch installation. setting up a call. There is a position indicator at the right, showing thatthere are 18 positions, each of which is centered by the cam and roller Aat the left. 250 AUTOMATIC TELEPHONY
Telephone
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