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 514
.<cW^AA.^A^/\ … <i//i//WiWl^^ is i^B Fig. 315. Duplex Telegraph, Differential System. The cut shows a diagram of the operation of one end of the line.R and R are resistances, E and E are earth contacts, and the twocircles show the magnet of the receiving instrument wound with LIMB
Electricity
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