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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. 1854 Excerpt:...the pressure when the temperature is known, or to determine the temperature when the pressure is known. The most extensive as well as the most delicate experiments ever undertaken, are those of Arago and Dulong, which were made at the expense of the French Government; these experiments range from 1 atmosphere up to 24, and the following formula has been given by those eminent philosophers, which will represent the temperature for pressures from 4 to 60 atmospheres, without any sensible error. These formulae differ a little from those given by Pambour; he p = (-269704 +-0068031 05.. (7) t = 146-991 Tp--39-644 where p is the pressure in pounds per square inch, and t the temperature in degrees of Fahrenheit. Tredgold's formula, as modified by Mellet, for pressures from 1 to 4 atmospheres,,i_03-+jy 8 r 201-18 /; t = 201-18 %/p-103. The formula by Pambour for the same range, is /98-806-My Q v 198-562 J K' t-198-562 VJ-98-806 Another useful property of elastic fluids has been discovered by the celebrated Gay Lussac; viz. that if the temperature of a given weight of any elastic fluid be made to vary, its tension being the same, it will receive augmentations of volume exactly proportional to the augmentations of temperature, and for every increase of one degree of temperature (Fahrenheit) will be produced an increase of-00202 of the volume occupied by the fluid at the temperature of 32. If v be the volume of any given weight of elastic fluid under any pressure, and at the temperature of 32 of Fahrenheit, the volume it will occupy under the same pressure and at the temperature t, of Fahrenheit, will be v' = v + v x-00202 (t-32) (1) Also, for the volume vf' and temperature t, we have has made some slight mistake in converting the French measures into English. We omit...