Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 270
current, nor capable of being read to a very greatnicety. All the most accurate measurements are thereforemade by extremely sensitive galvanometers of the astatic ormirror type, the adjustment of the apparatus requiring thatthe current through the galvanometer shall vanish. The chief instrument… … represented by the lines AB, AC in one plane, and thepotential difference between A and B or C by a line ADperpendicular to the plane. The lines DB and DC will(Art. 147) give the potential-gradient. If two points B, Fbetaken in AB and AC respectively, so that AB : BB :: AF: FC 251 252 Electricity.…
Electricity
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