American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 603
It may be seen that the long break in the periphery of the number break-wheelNE is placed at a point where the continuity of the circuit is taken up by one or other ofthe flat springs/1/2, etc., by contact with a break-wheel; and that a similar long breakis made in the periphery of the other…
Telegraph
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