Excerpt from The Theory of the Steam Engine: Showing the Inaccuracy of the Methods in Use
In the Treatise on Locomotive Engines, the first French edition of which appeared in the beginning of 1835, we developed a new theory of the steam-engine. We then made the application of it merely to locomotive engines, because the subject constrained us so to do; but we announced at the same time, that this theory was no less necessary to calculate with accuracy, either the effects or the proportions of other steam-engines of every description.
Immediately after the publication of that Treatise, the theory we speak of was adopted in several works. An illustrious member of the Institut, of whom science has lately had to deplore the loss, M. Navier, who had just published in the Annales des Ponts-et Chaussees of 1835, a paper on the use of locomotive engines, immediately resumed his work, and presented in 1836, in the same scientific publication, another paper, in which he acknowledged the accuracy of the theory we had just introduced, and abandoned, in consequence, the ordinary process of calculation to substitute ours in its place.
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