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Reference Temperatures for Thermels, Especially in Calorimetry
1.W. P. White, Phys. Rev. 31, 588 (1910);
1.W. P. White, J. Am. Chem. Soc. 36, 2318, 2323 (1914). See Figs. 1 and 2, this paper.
2.Some workers have used thermels to read the thermal head of the calorimeter, even though this meant, for them, introducing a second measuring system. A potentiometer is needed anyway for accurate electric calibration; it is a simplification to use it for the main temperature also, and a gain to have it available for reading the thermal head.
3.Erich Lange, Fortschritte Chem., Physik Physikal. Chem. 19, 443 (1928).
4.F. M. Jaeger and E. Rosenbohm, Rec. des Trav. Chim. des Pays‐Bas 51, 3 (1932).
5.The temperature difference in the water in the Dewar was about 1.5 percent of the thermal head.
6.It seems possible that evaporation might be detrimental between two bodies of water of different composition. This would scarcely happen if the two were occasionally mixed together, as they would be by a circulator or with the diving bell inclosure.
7.The best, though not the only, explanation in that case is diffusion of vapor through the adhesive tape with which some 60 linear centimeters of joints had been sealed.
8.Cf. H. C. Dickinson, Bull. Bur. Stand. 12, 28 (1915).
9.Walter P. White, J. Am. Chem. Soc. 36, 2318 (1914).
10.For thermal heads as large as 0.05° the temperature equalization by silver plates begins to be unsatisfactory, but entirely adequate stirring can be provided without appreciable heating. A wide propeller 17 mm long running in a tube at 80 R.P.M. was satisfactory in a pint Dewar. The very complete set of light pulleys, to be driven off the shaft of the bath stirrer, was made complete with frame in less than 2 hours.
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