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 271
Fig. 212.—Clutch mechanism. zontal disc for each sequence switch. On the shaft of the switch is adisc whose end is near the disc on the drive shaft. A stationary electro-magnet is capable of magnetizing these two discs, drawing them intocontact, and thereby causing a clutch action, rotating the… … Fig. 213.—Commutator.
Telephone
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