The London, Edinburgh and Dublin philosophical magazine and journal of science . which thezinc rests in a mass of moist zinc-sulphate crystals, has a verysmall diffusion lag, but has the disadvantage that there is apossibility of particles of zinc falling and reaching themercury. This fault is, howrever, eliminated in his invertedtype. The Carhart cell, in which the solution is of constantstrength, also possesses a very small diffusion lag, but it has \ the Electromotive Force of Clark Cells with Temperature. 295 two serious drawbacks, firstly, an error of a few tenths of adegree in the temper
The London, Edinburgh and Dublin philosophical magazine and journal of science . which thezinc rests in a mass of moist zinc-sulphate crystals, has a verysmall diffusion lag, but has the disadvantage that there is apossibility of particles of zinc falling and reaching themercury. This fault is, howrever, eliminated in his invertedtype. The Carhart cell, in which the solution is of constantstrength, also possesses a very small diffusion lag, but it has \ the Electromotive Force of Clark Cells with Temperature. 295 two serious drawbacks, firstly, an error of a few tenths of adegree in the temperature at which the cell is saturated makesan error of several ten-thousandths of a volt in the ,and, secondly, every time a current passes through the cell acertain amount of zinc is dissolved, so in time the solutionbecomes stronger. This point is of particular importancewhere the cells are used with condensers. Fig. 5.—Curves connecting and Temperature. Kate of Variation of Temperature, 1° in 15 minutes. Temperature in degrees 17 18 19 20 21 22. 296 Messrs. Spiers, Twyman, and Waters on Variations in Fig. 6.—Curves connecting and Temperature ; Rate of Changeof Temperature 1° in 30 minutes.
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectscience, bookyear1840
