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The diffusion of gases through liquids and allied experiments . ditions under which flow takes place. In fig. I, ab is a. rubber hose filled with water,terminating in the receiver R. Here the lowerlevel of water may be read off. Moreover, R isprovided with an open hose C, through which pres-sure or suction may be applied by the mouth, forthe purpose of raising or lowering the swimmer, vd, in the column A. Inthis way constancy of temperature is secured throughout the column. 3. Barometer.—The apparatus is obviously useful for ordinary baro-metric purposes, and provided the temperature, /, of th

The diffusion of gases through liquids and allied experiments . ditions under which flow takes place. In fig. I, ab is a. rubber hose filled with water,terminating in the receiver R. Here the lowerlevel of water may be read off. Moreover, R isprovided with an open hose C, through which pres-sure or suction may be applied by the mouth, forthe purpose of raising or lowering the swimmer, vd, in the column A. Inthis way constancy of temperature is secured throughout the column. 3. Barometer.—The apparatus is obviously useful for ordinary baro-metric purposes, and provided the temperature, /, of th Stock Photo
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The Reading Room / Alamy Stock Photo

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2AJBY41

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1487 x 1679 px | 25.2 x 28.4 cm | 9.9 x 11.2 inches | 150dpi

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The diffusion of gases through liquids and allied experiments . ditions under which flow takes place. In fig. I, ab is a. rubber hose filled with water, terminating in the receiver R. Here the lowerlevel of water may be read off. Moreover, R isprovided with an open hose C, through which pres-sure or suction may be applied by the mouth, forthe purpose of raising or lowering the swimmer, vd, in the column A. Inthis way constancy of temperature is secured throughout the column. 3. Barometer.—The apparatus is obviously useful for ordinary baro-metric purposes, and provided the temperature, /, of the air at v is knownto 0.025° C., the barometric height should be determinable as far as o. i 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-. FiG. I.—Cartesian diver ad-justed for diffusion meas-urement. *Am. Journ. Sci., ix, 1900, pp. 397-400. THE DIFFUSION OF GASES THROUGH ancy which will be felt in the lapse of time. The question will be discussedin the next chapter. 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 T p^ ~ gM {i--m/M)-pu, /p<, (i) .%::;

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