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 319
ositionthe galvanometer G is in circuit with the opposite coatings of thecondenser C. On depressing the contact S.^ is broken and 6^ ismade. This brings the battery B in circuit with the condensercoatings. On releasing the key it springs up and the galvanometerreceives the effect of the charge of… … Fig-. 207. Kempes Discharge Key. Key, Double Tapper. A telegraph key giving contacts alter-nately for currents in opposite directions, used in needle telegraphy. Key, Jncrement. A key for use in duplex and quadruplextelegraphy. Its action is to increase the line current, not merely tosuddenly turn…
Electricity
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