American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 557
de the box is pulled down the end within thebox, is elevated. When the end sh of the lever is thus raised it comes in contactwith the disc d which it lifts up. The disc in turn lifts the lever l up, and away fromthe pin/>, on the periphery of w, permitting the train of wheels to start. This… … THE GAME WELL FIRE ALARM, 447 starting hook might now he pnlled hidefinitely without bringing its end sh in contactwith the lever l. When the outer door of a signal box is closed it thrusts a rodagainst the lever si, which rod holds that lever towards its magnet, regardless ofwhether the circuit is…
Telegraph
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