Items related to Smithsonian miscellaneous collections Volume 69, no....
Synopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 Excerpt: ...rough countries, on account of its being more conveniently transported and much less liable to accidents than the mercurial barometer. A suitable form for it, designed by Regnault (Annates de Chimie et de Physique, Tome xiv, p. 202), consists of an accurate thermometer with long degrees, subdivided into tenths. For observation the bulb is placed about 2 or 3 centimeters above the surface of the water, in the steam arising from distilled water in a cylindrical vessel, the water being made to boil by a spirit-lamp. TABLES 67, 66. Barometric pressures at standard gravity corresponding to the temperature of boiling water. Table 67. English Measures. Table 68. Metric Measures. Table 67 is copied directly from Table 70. The argument is the temperature of boiling water for every tenth of a degree from 1850 to 214T9 Fahrenheit. The tabular values are given to the nearest 0.001 inch. Table 68 is copied directly from Table 72. The argument is given for every tenth of a degree from 8oo to 1oo9 C. The tabular values are given to the nearest O.O1 mm. HYGROMETRICAL TABLES. PRESSURE OF 8ATURATED AQUEOUS VAPOR. In former editions of these tables the values of aqueous vapor pressures at temperatures between--290 and 1000 C. were based upon Broch's reduction of the classic observations of Regnault. (Travaux et MSmoires du Bureau international des Poids et Mesures, t. I, p. A 19-39). In these computations the same continuous mathematical function was employed to calculate the values of vapor pressure both above and below the point of change of state on freezing. This resulted in a systematic disagreement between observed and computed vapor pressures below the freezing point, and confirmed the inference from the laws of diffusion following from the kinetic theory of gases, nam...
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