American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 422
herto been so arranged, chieflj^ perhaps, because such attention isleast available where the use of such a service would be most advantageous, as, for ex-ample, in branch offices. Experience has shown that this device is much better adapted for short, than longcircuits. The Edison Phonoplex. This… … z. ine^ L^TTW^ EDISON PHONOPLEX-THEOKY. A theortical diagram of the system is given in Fig. 266. In that figure, r and kare the ordinary Morse relay and key. m is a coil of wire wound upon an iron coreformed of a bundle of fine iron wires. It is employed to originate pulsatory currentswhen the…
Telegraph
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