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
<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 … Fig. 316. Differential Duplex Telegraph Connections. two coils in opposition. The battery and key are also shown. Italso illustrates what happens if the key of the receiver is in theintermediate position breaking contact at both i and 2. The send-ers line current then goes through both coils of the…
Electricity
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