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 522
itsstrength, while that oiK^ is to strengthen it, whatever its direction.The resistance coil s, of 100° resistance, is called a spark coilybecause it prevents the high electro-motive force of the wholebattery from damaging the points of contact by sparking or formingan arc across when signals are… … llflh^Hlilllllllllll- Fig. 321. QuADRUPLEX Telegraph, y^i and B^ (Fig- 320) are the relays which are used to respond tothe changes in the currents sent by the keys K^ and K^ at thedistant station. A^ is a simple polarized relay wound differentially, each wirehaving a resistance of 200 cj, and so…
Electricity
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