American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 501
424 AMERICAN TELEGRAPHY. FIG. 315. … riding on the flange f of wheel h. The next instant the ear will strike against thatarrt, and throw the tongue out of a hole / on the side of h. This act throws the ear between two of a circular row of teeth (Fig. 315) which teeth are fixed just outside of the normal path of the ear. These teeth…
Telegraph
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