In terminology, Clausiusian refers to thermodynamical views, model, system, and general school of thought of the pioneering 1850 to 1865 work of German physicist Rudolf Clausius on the nature of heat, work, and energy; and or those views deduced therefrom.

The following are representative quotes:

“This excellent work [Thermodynamics of the Steam-Engine and other Heat Engines (1898) by Cecil Peabody] has now been ten years before the public and is well known to every member of the engineering profession. It has been, during these years, the representative, in this country and in the English language, of the Clausiusian system of thermodynamics, as applied in the work of the engineer, and it has been from the first, a standard treatise. … The book constitutes an excellent treatise for use in engineering schools and colleges as a text-book-based upon the methods of Clausius and of Zeuner.
Robert Thurston (1899) [1]

“Every chapter [of Sidney Reeve’s Thermodynamics of Heat-Engines, 1903] gives proof of independent thought, and while, unquestionably, many of the modes of expression of fundamental ideas and facts would be differently presented and probably sometimes criticized by one trained in the forms of the great school of Clausiusian writers, every competent critic will probably admit the soundness of the philosophy and the clarity of expression which distinguish the book.”
Robert Thurston (1903) [2]

1. Thurston, Robert H. (1899). “Review of Cecil Peabody’s Thermodynamics and the Steam-Engine and other Heat Engines” (pg. 86), Sibley Journal of Engineering, Volume 13.
2. Thurston, Robert H. (1903). “Review of Sidney Reeve’s Thermodynamics of Heat Engines” (pg. 305), Science, Volume 17.

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