Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 286
ctro- Magnetism and Dynamics. 267 the mercury in the annular cup. The wires are so bentthat the centre of gravity is brought below the cup. Todiminish friction on the cup, the wire frame is also sus-pended by a few fibres of unspun silk, by which nearlyits whole weight is borne (see Fig. 173), and… … Fig. 166. 181. Effects of Terrestrial Magnetism on Move-able Currents.—By means of the double rectangle ofFig. 166, if the rectangles be made large enough (each notless than 10 in. by 8 in.), it will be found, on passing a cur-rent, that the framework sets as a magnet would, but with itsplane at…
Electricity
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