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‎Recherches sur les chaleurs spécifiques des fluides élastiques (3).‎

‎(Paris, Bachelier), 1853. 4to. No wrappers. In: ""Comptes Rendus Hebdomadaires des Séances de L'Academie des Sciences"", Tome 36, No 16. Pp. (669-) 707. (Entire issue offered). Regnault's paper: pp. 676-687. A few marginal brownspots.‎

‎First apperance of this very importent paper where Regnault declared his acceptance of the conservation of energy.""Speculation and discussions of theory are noticeably absent from Regnault’s published work, as they are from his surviving notebooks. But in 1853 he declared his acceptance of the principle of the conservation of energy"" and later he measured the mechanical equivalent of heat, although with only moderate success. In declaring his support for the principle, Regnault stated that he had subscribed to the mechanical theory of heat “for a long time” and that he had been led to it independently through his own experiments ""Comptes rendus... de AcademiE des sciences..."" (The paper offered). ""(DSB).Roberts & Trent ""Bibliotheca Mechanica"", p. 275.‎