Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 308
o neighboring Hues, electrostatic disturbances may alsobe neutralized, although such disturbances were inap-preciable along the electrified zone of the New HavenRailroad. 9. Simultaneous Use of Lines for Telegraphy and Teleph-ony.— A pair of Hne wires forming a metalHc telephonecircuit may be… … SUBSCRIBER 1 SUBSCRIBER 2 Fig. 19. P fOO COMMON-BATTERY TELEPHONE CB yT^r U.E [
Telegraph
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