The temperature coefficient of the saturated Weston cell

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Abstract
The effect of temperature on the electromotive force and on the performance of acid Weston cells has been studied from - 24 to + 40° C. The e.m.f. reached a maximum at about 3°, and at - 20° it was just over a millivolt less than the maximum. The cells behaved satisfactorily at - 16°, but at - 18° freezing took place gradually and was accompanied by a rapid decrease in e.m.f. At - 24° the electrolyte had completely solidified, and the e.m.f. was about 12 millivolts lower than the maximum. The frozen cells resumed their normal behaviour when kept at room temperature for about a day. Cooling increased the internal resistance of the cells. The e.m.f. temperature formula in common use does not hold below 0°, but a slightly different formula has been obtained, valid between - 20° and + 40°.

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