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 622
Fig. 377- Regulating Sockets. or a choking coil, the action of which may be controlled bya key or knob, so that the brilliancy of the lamp is varied. Relay, Double Balanced. A combination of two relays on onebase, with their armatures so adjusted that either a very slight … Fig. 378. Double Balanced Relay. increase or decrease in the line current will close the local circuit.It is used in burglar alarm systems. Relay, Marconis. An instrument for receiving messages sentby a system of high-frequency electric waves. It consists of asmall glass tube 4 cm. long, into which…
Electricity
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