The standard electrical dictionary : a popular encyclopaedia of words and terms used in the practice of electrical engineering (1898)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · London : Crosby Lockwood and Son · leaf 513
s own instrument except by sending the equal and ^_ 508 STANDARD ELECTRICAL DICTIONARY. opposite currents through its coils. When his key is depressedand As key is untouched, he works As receiving instrument. When As key is depressed simultaneously with B^s key, thetwo line currents are in… … Fig. 314. Duplex Telegraph, Differential System, Suppose that B is sending a dash, and it begins while As key israised. The line and compensation currents in Bs receiving in-strument neutralize each other and no effect is produced, whileAs receiving instrument begins to register or indicate a…
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