American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 473
close to the left ends of the electro-magnets in such a way that whenany one of the coils is charged with a current, and, consequently, draws in its iron core,against the pull of spring s\ an extension of the core, which is thereby caused to pro-trude from the left end of the coil, gets into the… … TRANSMITTER KEY BOARD. The key-board used in this system is a circular one (resembling that outlined inFig. 301), with the figure and fraction keys in a circle within the letter keys. In Fig.300, a section, kb of the key-board, is shown; with the dot key, and keysA b; also the repeat key, and…
Telegraph
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