1856, ISBN: 9781156336519

Paperback. New. This item is printed on demand. Paperback. This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (… Mehr…

Paperback. New. This item is printed on demand. Paperback. This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1856 Excerpt: . . . a visible form, resembling smoke. Its expansive force, however, is not wholly destroyed; for the vesicles themselves expand as they rise, and soon become invisible, mingling with other vapors in the air. Could we look into the cylinder, fitted with highly elastic steam, we should be able to see nothing. But, that the steam is thore, and in its invisible form exerting a prodigious force, we know by the movements of the piston it, a vacuum will be formed, and the pressure of the atmosphere on the piston above will drive it down. The admission of more steam below will raise it again, and thus a continued motion of the piston, up and down, will be produced. This motion of the piston is communicated to wheels, levers, and other machinery, in such a manner as to produce the effect intended. How was the J60. This is the mode in which the engine of oNewcomm Newcomen and Savery, commonly called the atand Savery mospheric engine, was constructed. It was called constructed the atmospheric engine because half of the work was done by the pressure of the atmosphere, namely, the downward motion of the piston. What improve-761. The celebrated Mr. James Watt introwaU make in ucec wo imPortant improvements into the steamthe steam-en-engine. Observing that the cooling of the cylinder gtne by the water thrown into it to condense the steam lessened the expansibility of the steam, he contrived a method to withdraw the steam from the principal cylinder, after it had performed its office, into a condensing-chamber, where it is reconverted into water, and conveyed back to the boiler. The other improvement, called the double action, consists in substituting the expansive power of steam for the atmospheric pressure. This was performed by admitting the steam into the cylinde. . . This item ships from La Vergne,TN.<