[Bubier], Edward Trevert, 1858- [from old catalog] · Lynn, Mass., Bubier pub. co. · leaf 326
use of the heating effectof a current instead of its magnetic effect, and therise of temperature of the conductor is measuredby its expansion. This conductor, in the Cardewvoltmeter, consists of about fourteen feet of plati-num-silver wire of extremely small diameter ; this ;>24 ELECTKICITY AND… … CARDEW VOLTMETER. counteracted by a cord attached to a spiral spring,and passing about a small wheel, which, by itsrevolution, causes the pointer to be carried overthe scale. This, as the wire expands or contracts,the pointer indicates, by its greater or less deflec- RECENT APPLICATIONS. 325 tion,…
Electricity
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