P., 1886/1887, un volume in 4 relié en demi-basane verte (reliure de l'époque), (dos passé, cachets de bibliothèque).
Reference : 6285
---- TROIS OUVRAGES ET DEUX MEMOIRES ORIGINAUX par G.A. HIRN Réunis en un volume ---- BON EXEMPLAIRE ---- "Hirn became one of the first to investigate the internal phenomena of the steam engine. In 1847 he discovered the mechanical equivalent of heat. He established the first heat balance. He showed the beneficial advantage of superheat over dry saturated steam in reducing cylinder condensation. Furthermore, he convinced skeptics of the advantage of steam-jacketing cylinders. He proved decisively that cylinder walls were active thermal reservoirs". (DSB VI pp. 431/432)---- "Independently of Mayer and Joule, Hirn discovered the mechanical equivalent of heat in 1847 and in 1854 constructed the first heat balance". (Bibliotheca Mechanica)**6285/L6DE
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