A Treatise on the Steam Engine; From the Seventh Edition of the Encyclopedia Britannica

A Treatise on the Steam Engine; From the Seventh Edition of the Encyclopedia Britannica

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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. 1846 edition. Excerpt: ...we have already described. The force of the steam-engine was made to draw up a piston from the bottom of a cylinder, leaving a vacuum below it. Into this vacuum the piston was again carried down, after the action of the steam had ceased, by the whole force of the atmosphere, amounting to about 15 Ibs. on every inch of its surface. Thus the atmosphere was rendered a reservoir of power, the power being first of all taken up by forming the vacuum, and again given out by the atmosphere pressing the piston down into the vacuum. The following is the arrangement by which Mr Buckle accomplished his object. P, fig. 112, being the usual piston and cylinder of the steam-engine, L L the usual beam or lever, L R the connecting rod, R O the crank, and R W W W a toothed wheel carried round by the crank, as usual in the steam-engine. To this is added a smaller wheel r w w, having only half as many teeth as the larger, so that during one turn of the small wheel, the large one performs half a revolution; /1 is a second lever attached by a rod to a crank r, and by another rod IH it lifts a piston from the bottom to the top of an open pump H, leaving a vacuum beneath. When the piston is at the botom of the pump, the crank R is near the point 1 in the figure. While the crank passes down from 1 to 2, it is raising the piston in the pump against the pres N sure of the atmosphere, the steam then exerting its greatest force; but when the large crank reaches point 2, the small crank r is at the bottom of its circuit, the piston in the pump is at the top; and now the pressure of the atmosphere carries the piston down into H, turning the little wheel r w w along with it, and propelling the large wheel and crank from 2 to 3, through that part of the stroke where there is a...show more

Product details

  • Paperback | 72 pages
  • 189 x 246 x 4mm | 145g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236611195
  • 9781236611192