American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 399
illator and the cohererk are not connected to the earth, as in Figs. 254^/, 254^, but that a small inductioncoil or transformer, t, is interposed. In Fig. 254/*!, A is the vertical wire which is OOD<b S£- AMERICAN TELEGRAPHY. attached at its lower end to a coil of wire w. The end of the wire s,…
Telegraph
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