Cooke, Josiah Parsons, 1827-1894 · Boston, Little, Brown and Company · leaf 485
and will remain in any position in which it may be placed.Moreover, the action of an electric current Tipon it is not influ-enced by the magnetism of the earth. The graduated disk justreferred to rests on the ivory frame, and is made of copper, whichhas the effect of deadening the oscillations of… … Fig. 363. The apparatus is so delicate, that the heat of the hand, placedseveral feet in front of the conical cap G, will be at once percep-tible, by deflecting the needle. Moreover, when the deflection isnot greater than twenty degrees, the angle of deviation is propor-tional to the difference of…
Matter · Heat
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