Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 39
AGS J2Dj3 Fig. 20. by means of the Torsion Balance (Fig. 21). It consists essen-tially of three parts—(1.) A long thin magnetic needle, -4, 20 Electricity. [Book I, evenly magnetized and suspended, so as to swing in a hori-zontal plane by a fine silver wire, which is attached above to aTorsion… … Fig. 21. circle (shown enlarged on the right of Fig. 21) carries theupper end of the wire coiled on the horizontal arm CD,supported on the frame E, which can be twisted round thevertical axis, the graduated limb FQ measuring the twist puton to the wire in performing an experiment. (3.) The…
Electricity
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