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 379
he wire. The wire may be made of platinum or of platinum-iridium alloy. The latter is very hard and not easily worn out. Sometimes, as shown in the cut, three parallel wires are stretchedalong the base-board of the instrument, and arranged so that asingle wire, two wires or three wires in series… … Fig. 240. Meter Bridge. In the cut/ K is the wire, traversed by the contact key. Bymoving the contact C back and forth in the slot it can be broughtover any of the three divisions of the wire. H is the handle fordepressing the key. 6 is a flat spring, carrying the contact pieceand holding it up…
Electricity
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