Hallberg, Josef Henrik, 1874- · New York city, The Moving picture world · leaf 151
CTRICITY consequent temperature rise. It has been found that ironor steel wire possess this quality. For practical pur-poses, however, the pure iron or steel wire, is not of suffi-ciently high resistance; therefore, it is customary to usea wire made from a special alloy, composed of steel andnickel… … For the highest class of rheostats, a special wire madefrom an alloy composed mainly of nickel and copper issometimes used. The object in using nickel copper wireis to prevent rust, especially where the rheostat is usedoutdoors, or transported from place to place where itwould be likely to be…
Motion picture theaters · Electric lighting
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