The Philosophical magazine; a journal of theoretical, experimental and applied physics . o of/_^, or its equal He, to D C is nearly the same asthat of 0°-26 to 273°-f 10°, or of the increment of temperatureto the G temperature, or temperature reckoned from the zeroof gaseous tension. The ratio of De to D/ is nearly 1 to 4, asdetermined by the experiments of MM. Clement and Desormes,also of MM. Gay-Lussac and Welter (Mecamjwe Celeste, book 12).The ratio of D/to DC is thus nearly 1-04 to 283, or 1 to 272;and this is the amount of deviation from the law of Mariotte inair at 10° C. between the pre
The Philosophical magazine; a journal of theoretical, experimental and applied physics . o of/_^, or its equal He, to D C is nearly the same asthat of 0°-26 to 273°-f 10°, or of the increment of temperatureto the G temperature, or temperature reckoned from the zeroof gaseous tension. The ratio of De to D/ is nearly 1 to 4, asdetermined by the experiments of MM. Clement and Desormes,also of MM. Gay-Lussac and Welter (Mecamjwe Celeste, book 12).The ratio of D/to DC is thus nearly 1-04 to 283, or 1 to 272;and this is the amount of deviation from the law of Mariotte inair at 10° C. between the pressure of two and one atmospheres,as derived from Messrs. Thomson and Joules experiments onthermal effect. The above result may be exhibited in diagram by A B, another cylinder resting on the same plane as C D, and having one-half the transverse area. The weight of the piston U being equal to W, and the weight of air in each cylinder being the same, as well , 271 as the temperature, we have AB=/C equal to jj^ of CD. § 4. This computation, expressed by symbols, is _cl A=7^ 273 + /. the Primary Laws of Elastic Fluids. 281 in which A represents the deviation^ t the temperature on Centigrade scale,0 the observed cooling effect, n the ratio ^ (which is 3-78, taking the mean of theexperiments from the Mecanique Celeste). § 5. In the demonstration of this process, it is assumed as anaxiom that air, in passing from a higher to a lower state of den-sity without performing work, does not gain or lose heat upon thewhole. (This is called Mayei-^s hypothesis by Prof. Thomson.)Thus suppose S W, tig. 2, to represent a cylinder impervious toheat, and that it is divided p. ^ by a partition k k. On oneside of this (S) let there beair, and on the other (W) aperfect vacuum. If we nowimagine k k to he instanta-neously withdrawn, the airin S rushes violently into first, great motion in thedirection S W is generated, and a corresponding lowering oftemperature: then the motion is reconverted
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