Clark and Weston standard cells . count of the hysteresis frequently observed. All comparisonswere therefore made in electrically heated and controlled kerosenebaths. The baths, 70 cm in diameter and 40 cm deep, were set up in aroom in the basement of the laboratory, the temperature of whichwas automatically controlled to within i° to 2° for most of the year 41 Wright and Thompson: Phil. Mag. (5), 16, p. 28; : Zs. f. Instrk., 13, p. 298; and Barnes: Proc. Roy. Soc, 62, p. 117; : , 10, p. 268; and Hulett: Trans. Am. Electrochem. Soc, 5,

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Clark and Weston standard cells . count of the hysteresis frequently observed. All comparisonswere therefore made in electrically heated and controlled kerosenebaths. The baths, 70 cm in diameter and 40 cm deep, were set up in aroom in the basement of the laboratory, the temperature of whichwas automatically controlled to within i° to 2° for most of the year 41 Wright and Thompson: Phil. Mag. (5), 16, p. 28; : Zs. f. Instrk., 13, p. 298; and Barnes: Proc. Roy. Soc, 62, p. 117; : , 10, p. 268; and Hulett: Trans. Am. Electrochem. Soc, 5, p. 67; 1904. 34 Bulletin of the Bureatt of Standards. [ Vol. 4, No. i. by means of a thermostat pneumatically operating dampers in thehot and tempered air supply ducts. As there were no windows, thecells were also protected against any possible influence of direct oreven diffusedsun light. The construction of the thermoregulator employed in the baths,although not embodying any essentially new features, is described r no p-n J J.

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