No CrossRef data available.
We use cookies to distinguish you from other users and to provide you with a better experience on our websites. Close this message to accept cookies or find out how to manage your cookie settings.
We use cookies to distinguish you from other users and to provide you with a better experience on our websites. Close this message to accept cookies or find out how to manage your cookie settings.
Published online by Cambridge University Press: 17 January 2013
1. The important researches of Joule on the thermal circumstances connected with the expansion and compression of air, and the admirable reasoning upon them, expressed in his paper “On the Changes of Temperature produced by the Rarefaction and Condensation of Air,” especially the way in which he takes into account any mechanical effect that may be externally produced, or internally lost, in fluid friction, have introduced an entirely new method of treating questions regarding the physical properties of fluids. The object of the present paper is to show how, by the use of this new method, in connection with the principles explained in my preceding paper, a complete theoretical view may be obtained of the phenomena experimented on by Joule; and to point out some of the objects to be attained by a continuation and extension of his experimental researches.
page 289 note * Philosophical Magazine, May 1845, vol. xxvi., p. 369Google Scholar.
page 289 note † Transactions, vol. xvi,, part V.
page 289 note ‡ To avoid circumlocution these laws will, in what follows, be called simply, the gaseous laws, or the gaseous laws of density.
page 290 note * Throughout this paper formulæ, which involve no hypothesis whatever, are marked with italic letters; formulæ which involve Boyle's and Dalton's laws are marked with Arabic numerals; and formulæ involving, besides, Mayer's hypothesis, are marked with Roman numerals.
page 291 note * In violation of Carnot's important principle, that thermal agency and mechanical effect, or mechanical agency and thermal effect, cannot be regarded in the simple relation of cause and effect, when any other effect, such as the alteration of the density of a body, is finally concerned.
page 293 note * Joule's experimental verification of Mayer's law for temperatures of from 50° to 60° Fahr., shews, if rigorously exact, that the density of saturated steam at about 10° centigrade must be 
of what was assumed for it in the calculations of my former paper, but does not go towards indieating any deviation from the gaseous laws of variation in the density of saturated steam at different temperatures.
page 293 note † Philosophical Magazine, May 1845.
page 298 note * Phil. Mag., vol. xxvi.