Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 312
ferences be-tween the telephone and tele-ffraph circuits. The two coils ^ Fig. 23. R at each end may also be replaced by a repeating coil of the type shown in Fig. 21. The follo^\dng numbers indicate the order of magnitudeof the condenser capacities: c = 2 mf., Ci = 2 mf. andC2 = 6 mf. The… … 298 TELEGRAPH ENGINEERING low-frequency generators (about 16 cycles) is unsatisfactorybecause the impedance of the retardation coils Z is smallto these ringing currents, resulting in chattering of therelay armatures. Instead, calling is accomplished bymeans of weak high-frequency currents (about…
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