Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 164
TELEGRAPH OFFICE EQUIPMENT — TRAFFIC 149 … 150 TELEGRAPH ENGINEERING started and brought up to proper voltage by means of itsfield-regulating rheostat RR and placed in parallel withits neighbor by throwing switch E to the left and closingswitch B. Thereafter switches A and then F are opened.In the figure V and A indicate voltmeters and…
Telegraph
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