[Bubier], Edward Trevert, 1858- [from old catalog] · Lynn, Mass., Bubier pub. co. · leaf 328
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… … AYRTON & PERRY SPRING VOLTMETER AND SPRING AMMETER. box containing coils of insulated platinum-silverwire, so wound as to avoid self-induction. Thecoils are made of different sizes of wire, in order tovary their resistance from one to 4,000 ohms, and PvECEXT APPLICATIONS. 327 their ends are…
Electricity
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