Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 236
aw. 217 hole, into which brass plugs (F. G) fit. When the plugs are inposition, the current passes across the plug; but when theplug is withdrawn, the current goes through the correspond-ing wire. The coils are fitted up in boxes (Fig. 133), thenumbers of ohms in successive coils being 1, 2, 3, 4,… … Fig. 133. We may observe that the ohm is about equal to the resist-ance of a yard of fine galvanometer copper wire (B. W. G. No. 40). *I47. Potential Gradient.—Our first illustration ofOhms law consists of the construction of potentialgradients. Take a battery of three or four Darnells cells(.4,…
Electricity
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