American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 600
C,which, when operated,reverses the main bat-tery B in the u^ualway.A is an annunciator mag-net, or electric bell, vis a grooved screw,geared with the clock-work and started by theregister lever; this screwtends to bring a leverI into connection withd contact point x con-trolling the…
Telegraph
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