American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 561
o-m ignet in the firealarm or other circuit. c,Cj^,C2, represent three cylinders on eacli of which num-erals from o to 9 are imprinted, one above the other, as outlined. Each cylinder isgiven a tendency to turn on its axle in the direction of the arrow, but is preventedfrom so doing by arms… … case. When either of the fingers f, f^, Fg, is lifted momentarily it pushes back its cor-responding extension rod. This act moves the upper end of the extension rod out ofthe path of its projecting pin /, thus permitting the cylinder to turn the distanceof one numeral, when the extension rod again…
Telegraph
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