American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 258
r is the resistance coil equalling the resistance of the main line; gc is the ground coil,thrown into circuit when the switch sp is turned to the right in the figure; its resistanceis made to equal the internal resistance of the full battery mb. THE QUADRUPLEX. 215 FIG. 173. … REPEATING SOUNDER. The connections, as shown in Fig. 170, are, of course, apt to be transposed, insome respects, in practice, but they may be easily verified by following out the actualdesk connections. It is alwayswell in practice not to relytoo implicitly on any dia-gram of such connections…
Telegraph
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