Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 129
z^fiiS … Fig. 5. either the distant automatic transmitter or the distantmanually-operated pole-changer. The Wheatstone systemis almost invariably operated duplex. Repeaters for use with the Wheatstone automatic systemresemble polar direct-point duplex repeaters (§ lo, Chap. II)thereby dispensing with…
Telegraph
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