Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 313
REPEATINGCOIL Fig. 24. REPEATINfiCOIL telephone circuit, as shown schematically in Fig. 24. Thelocation of the simplex telegraphic apparatus is indicatedby the letters A, B, C and D. In a similar manner, twotelephone circuits, each adapted for composite working asshown in Fig. 22, may also…
Telegraph
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