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 67
trunk No. 10, ready to start all overagain. The way that it is done is this: When the guide shaft is opposite trunk No. 1, finger No. 1 is pressingtogether the two-finger springs. When the starting relay operates, thetrip relay is pulled up as well as the lock magnet. The springs of thetrip relay… … Fig. 47.—Unmounted master switch. No. 10, where the finger No. 10 trips open the springs of the trip relay.This cuts off the current from the solenoid magnet, and returns the lockmagnet to the control of the starting relay. From then on, the actionis as has been described. If the tenth trunk is…
Telephone
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![An illustration from The Mason Machine Works, Taunton, Massachusetts, U.S.A., inventors and builders of cotton machinery : Founded 1842 ; Incorporated 1873 ; [Catalogue] (1898)](https://img.insideoutlibrary.com/img/200/ia-masonmachinework00maso-83-29@90.webp)
