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 73
Fig. 55.—Connector-switch bank, unwired. winding on an ordinary spool. The outside diameter of this ring, whichhas a rectangular cross section, is the same as that of the spool head, andthe inside diameter is just large enough to allow the ring to fit snugly over 56 A UTOMA TIC TELEPHON Y the core.… … Fig. 56.—Detail of connector-switch bank. the armature for the fraction of a second, giving it a very noticeable lag.As explained more fully in the description of the circuits of this system,
Telephone
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