Modern practice of the electric telegraph : a handbook for electricians and operators (1874)
Pope, Frank L., 1840-1895 · New York : D. Van Nostrand · leaf 144
of the most inte-resting problems in practical telegraphy is that of doubletransmission, or working in opposite directions at thesame time over a single wire. This apparently para-doxical result maybe accomplished in several differentways, the principles involved being very simple endeasily… … Fig. eo. A and B (Fig. 60), are the two terminal stations ofthe line. The main battery E, at station A, is placedwith its +, and the battery E at station B with its — 132 APPENDIX AND NOTES. pole to the line, as represented. M and M are thereceiving magnets or relays, which are wound through-out…
Telegraph
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