The standard electrical dictionary; a popular dictionary of words, terms, and phrases, used in the practice of electrical engineering (1897)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · New York, H. W. Henley & co. · leaf 514
/~**py»\ … 1 / Fig- 3J5- 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
Electricity
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