[Bubier], Edward Trevert, 1858- [from old catalog] · Lynn, Mass., Bubier pub. co. · leaf 327
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,… … wheatstones bridge. than the large one does, thus making the instru-ment nearly dead heat. By introducing extraresistance, a much greater range of electro-motiveforce can be used. The Cardevv voltmeter can be used equally wellfor direct or alternating currents, since, depending 326 ELECTRICITY AND…
Electricity
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