Excerpt from A New Treatise on Steam Engineering: Physical Properties of Permanent Gases and of Different Kinds of Vapor
The object of this treatise is to furnish a variety of matters pertaining to Steam Engineering which appear to be wanting in that profession, and which have heretofore not been published.
The authors consulted for this work are eminent experimenters, such as Regnault and Rudberg on steam and gases, Faraday, Pelouze and Andrews on carbonic acid, Favre and Silberman on heat of combustion, Kopp on volume of water, Fairbairn and Tate on volume of steam. None of these savans, however, are responsible for the formulas and tables herein deduced from their experiments.
Where physical sciences are not sufficiently developed to establish a law of action mathematically, exiperiments are made for the purpose of guiding us to the law; but it can rarely ever be expected that experiments alone can give perfect results, but they give an approximation to the law of variation, which must finally be adjusted and established by the aid of mathematics. This is what has been attempted in the present work.
It was at first not intended to include in this work the steam-tables which are published in the author's Pocket-Book, but after having carefully investigated the Fairbairn experiments and formula for volume of steam and concluding that they could not be relied upon, it was therefore decided to calculate new steam-tables and extend them to a pressure of 1000 pounds to the square inch.
The relation between temperature and pressure of steam is also slightly altered in the new steam-tables so as to conform to a uniform curve or law, because the average curve adopted by Regnault does not follow a regular law, and therefore indicates that there must have been some inexactness in his experiments.
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