Carnegie Institution of Washington publication . Fig. t.—Cartesian diver ad-justed for diffusion meas-urement. In 3. Barometer.—The apparatus is obviously useful for ordinary baro-metric purposes, and provided the temperature, /, of the air at v is knownto 0.0250 C, the barometric height should be determinable as far as 0.1 mm.Apart from this the sensitiveness of the apparatus is surprising. Great caremust be taken to avoid adiabatic changes of temperature, so that slowmanipulation is essential. These and other precautions were pointed outin the original paper. The apparatus labors under one f
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Carnegie Institution of Washington publication . Fig. t.—Cartesian diver ad-justed for diffusion meas-urement. In 3. Barometer.—The apparatus is obviously useful for ordinary baro-metric purposes, and provided the temperature, /, of the air at v is knownto 0.0250 C, the barometric height should be determinable as far as 0.1 mm.Apart from this the sensitiveness of the apparatus is surprising. Great caremust be taken to avoid adiabatic changes of temperature, so that slowmanipulation is essential. These and other precautions were pointed outin the original paper. The apparatus labors under one fundamental diffi-culty, as the diffusion of a compound gas like air is a complicated discrep- Am. Journ. Sci., ix, 1900, pp. 397-400. THE DIFFUSION OF GASES THROUGH ancy which will be felt in the lapse of time, in the next chapter. The question will be discussed 4. Equations. Manipulation.—Let h be the difference of level of the impris-oned water and the free surface in the reservoir R. Then it follows easily that Rm r 7 i jt rm pw~ gM (i+