American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 518
e is utilized.The route of the cir-cuits may be readilyfollowed by meansof the figures i, 2,3, etc. A side view ofthe punching ap-paratus and punch-magnets is given in Fig. 325c. , The punches a in this perforator are 16 in number, of the same diameteras those used in the Wheatstone mallet… … THEORY OF KEYBOARD PERFORATOR. 436/ AMERICAN TELEGRAPHY. series of punches making the necessary upper holes in the paper, the other series thelower holes, the latter series being set lower for that purpose. The paper strip iscaused to pass in a small space between the punches. The punch-magnets…
Telegraph
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