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1.E.g., Walter P. White, Phys. Rev. 31, 697 (1910);
1.E. Lange and J. Monheim, Zeits. f. Physik. Chemie 149, 51 (1930);
1.L. Ebert and Jörn Lange, Zeits. f. Physik. Chemie 149, 390 (1930).
2.Walter P. White, Phys. Rev. 31, 137 (1910);
2.Walter P. White, J. Am. Chem. Soc. 36, 2293 (1914).
3.Walter P. White, J. Am. Chem. Soc. 36, 2299 (1914).
4.A good deal of time was spent on an obscure effect observed whenever the temperature of the gradient portion above ice had been changed. This was around 0.000025 of the reading due to that gradient and lasted 15 minutes or more. The reading was lowered, and this was the case whether the wire had been warmed, or cooled by carbon‐dioxide snow, and when the junctions had remained in their stirred ice bath all through the experiment; hence, it can hardly have been due to a temperature lag of the junctions. These conditions also exclude a lagging temperature of the gradient portions of the thermel as a cause; and a further reason is that in the various thermels used the gradient portions were such as to read sometimes higher, sometimes lower, when warmer, and oppositely if colder. Hence a changing temperature of the gradient would have given an opposite effect half the time. This effect was sometimes actually observed and was easily distinguishable from the obscure effect, which lasted longer. Tension in the wire resulting from differential expansion is excluded from the possible causes both by special precautions taken and by the fact that in this sample of constantan wire tension increases the power of the thermel. On the other hand, a more sensitive test made between 20° and 60° on constantan wire alone, from the same spool, showed no trace of the obscure effect. Since the effect is so small and of such comparatively short duration it is not serious practically. Its further investigation is left for other experimenters.
5.This wax may possibly be obtainable in small quantities.
6.Very important data on insulators are given in: H. A. Curtis, Bull. Bur. Standards 11, 384 (1915).
7.Walter P. White, Phys. Rev. 25, 345 (1907);
7.Walter P. White, J. Am. Chem. Soc. 36, 1861 (1914).
7.Walter P. White, Compare Zeits. f. Instrumentenk. 52, 281 (1932).
8.L. Ebert and Jörn Lange, Zeits. f. Physik. Chemie 149, 402 (1930);
8.L. Ebert and Jörn Lange, Zeits. f. Instrumentenk. 51, 207 (1931);
8.cf. also Walter P. White, Zeits. f. Instrumentenk. 52, 281 (1932).
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