The London, Edinburgh and Dublin philosophical magazine and journal of science . ast years Philosophical Magazine*, allowme to express my full agreement with your views. But Ifurther believe that it will interest you to know that there is amethod of directly measuring differences of potential, whetherbetween two liquids or between a liquid and a metal.* Phil. Mag. October 1885, p. 372. Electromotive Forces in the Voltaic Cell. 71 The method rests upon a remark of Helmholtz*, that aquantity of mercury, if insulated, and arranged to form dropsquickly beneath the surface of a liquid, rapidly acqu
The London, Edinburgh and Dublin philosophical magazine and journal of science . ast years Philosophical Magazine*, allowme to express my full agreement with your views. But Ifurther believe that it will interest you to know that there is amethod of directly measuring differences of potential, whetherbetween two liquids or between a liquid and a metal.* Phil. Mag. October 1885, p. 372. Electromotive Forces in the Voltaic Cell. 71 The method rests upon a remark of Helmholtz*, that aquantity of mercury, if insulated, and arranged to form dropsquickly beneath the surface of a liquid, rapidly acquires thepotential of the liquid. Let T (fig. 1) be an insulated drop-ping-funnel full of mercury, which drops inside the liquid Fthrough a fine point, and let M be a metal plunged into thesame liquid; the electrometer E will indicate the true differ-ence of potential between M and F. I have experimentallyconvinced myself that, by careful regulation of the flow, onecan get the potential of the mercury to correspond with thatof the liquid within about -01 volt. Fig-. 1. Fig.
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectscience, bookyear1840
