Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 115
The generator voltage should be suihcient todevelop a current of from 0.09 to 0.15 ampere in the linewire when both transmitters and one pole-changer areclosed. ■ When extremely bad weather renders the second side ofthe quadruplex inoperative, the quadruplex circuit maybe used as a duplex circuit… … Fig. 10. repeater is shown in Fig. 10. The polarized relays Pi andP2 control the operation of pole-changers Ci and C2 re-spectively, and the neutral relays Ri and R2 control theoperation of transmitters T2 and Pi respectively. It ispossible also to have the pole-changers controlled by the…
Telegraph
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