Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 83
station is adjusted to equal the resistance ofthe Hne and the apparatus at the distant station, and theresistances of the two coils of each retardation coil are equal.When both keys are idle, the armatures of the pole-changers C and C rest against their rear stops which arejoined to the positive…
Telegraph
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