HISTORICAL ACCOUNT OF THE STEAM ENGINE. CHAP. I. Nature of Steam-Application of it as a moving power -Hero-Brancas-Marquis of Worcester-Sir Samuel Morland-Papin-Savery-Boaz-Newcomen-Hulls -Falck-Amontons-Deslandes-Francois. As the whole power of the Steam Engine depends on the employment of elastic vapour, produced from water at different temperatures, varying from 212°, or the boiling point of Fahrenheit's thermometer, to 300° of the same scale, it may be advisable in the first instance to examine some of the principal phenomena connected with the formation of vapour in its most simple form, and its application to the steam engine will then be sufficiently obvious. Steam is highly rarefied water, the particles of which are expanded by the absorption of caloric, or the matter of B. |