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<p>A series of experiments has been carried out with the primary object of obtaining complete data to formulate specifications, according to which the voltameter might be used at any time for the measurement of current and (with the aid of resistance standards) for checking the constancy of the Weston normal cell. The voltameters used were the porous cup and Smith form, which were found to be in substantial agreement and give the value 1.01827 int. volts for the Weston normal cell at 20 degrees C. A study of the effect of acid in the voltameter has shown a quantitative relation, expressed by the equation /b y/ =
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<br>Subjects: electrolysis; measurements and use of instruments; Condensed matter; electronic structure, electrical, magnetic, and optical properties</div>
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