Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 247
ng more than agrain. This is suspended by asingle fibre of silk in a cylinderof small diameter, round which iscoiled the wire in a solid cylinder.The length of the wire depends on the purpose for which thegalvanometer is used, in some consisting of a few yards ofstout wire, and in others of several… … Fig. 144. Chap. III.] Ohms Law. 229 is accomplished by means of the lamp and screen, just asshown in the quadrant electrometer (Fig. 105). On the topof the coils is placed a permanent magnet, which controls themagnet in the galvanometer, bringing the spot of light initiallyto the zero on the…
Electricity
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