American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 88
unquestionable that some of theself-closing £ rrangements devised would provide a remedy which would be ratherworse than the complaint; as, for example, that one in which the operators elbow,while he was sending, was to be caused to open a circuit closer which would be au-tomatically closed when… … SELF CLOSING KEY. has taken Its place. The key resembles other modern Morse keys quite closely. Itspeculiarity is that the finger-tip of hard-rubber is in two parts, a, b, one within theother. In size, a is about the same as the finger-tip of the ordinary key. At its cen-tre a circular hole is cut,…
Telegraph
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