American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 501
laced with relation to the upper part of the ear r that, after the lower part of the ear has been struck by the angular arm a and the wheel H is, consequently, halted in its progress, the wheel w can only traverse a space equal to the distance between any two of the pieces, say, ad, when one of… … FIG. 317.
Telegraph
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