REGNAULT, Henry Victor.

[Drop-title]: "Recherches sur les Chaleurs spécifiques des Fluides élastiques." 12 pp. Large 4to, disbound (a little foxed). [Paris]: "Extrait des Comptes rendus des séances de l'Académie des Sciences, Vol. XXXVI, Séance du 18 avril 1853." The very rare separately issued offprint; no copy in N.U.C. or OCLC. "In this very important paper Regnault declared his acceptance of the principle of the conservation of heat. Though he states that he had subscribed to the mechanical theory 'for a long time' and that he had been led to it by his own experiments, that appears not to be the case. He was later to measure the mechanical equivalent of heat, although with only moderate success. Timoshenko, 262 notes than in 1846 while a student of Regnault, Kelvin participated in his experiments on heat."­Roberts & Trent, Bibliotheca Mechanica, p. 275. Regnault (1810-78),graduated from the École Polytechnique in 1832 and entered the École des Mines, later travelling extensively through Europe to study mining and metallurgical practices. He returned to the Polytechnique as assistant to Gay-Lussac, succeeding him in the chair of chemistry in 1840. The following year he became professor of physics at the Collège de France, where he performed his most important experimental work. From 1854 he was director of the famous Sèvres porcelain factory. Fine copy preserved in a blue morocco-backed box. Ex Bibliotheca Mechanica.

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