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The Practical Management of Engines and Boilers; A Practical Guide for Engineers and Firemen and Steam Users Generally

The Practical Management of Engines and Boilers; A Practical Guide for Engineers and Firemen and Steam Users Generally


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About the Book

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1897 edition. Excerpt: ...with it, and when a return stroke of the engine occurs, the pencil will trace a line corresponding to the back pressure against which the engine piston is moving. This gives an idea of the process of tracing a diagram when steam follows full stroke; when a cut-off is used, the pencil traces the same line as before until the cut-off valve closes, when, as the pressure falls, there is traced a curve, which gives the pressure at each point of the forward motion according to the law for expansion of steam. The length of a diagram drawn in this way represents on a smaller scale the stroke of the engine, and the line traced by the pencil shows the pressures acting upon the piston. These pressures are measured by the movement of the spring contained in the indicator, an inch of movement, or an inch of height above the atmospheric line on the diagram, representing so many pounds pressure, according to the spring used; thus a 40-pound spring would compressed, so as to give the pencil a movement of one inch for 40 pounds steam pressure, and a 60 pound spring, one inch for 60 pounds pressure, and so on. Having, then, a scale, in which one-inch is divided into 30 or 40 parts, or any other number of parts such as ordinarily used, we can readily measure any pressure directly from the diagram when once we know what scale or spring has been employed. The Indicator Diagram. The indicator diagram enables us to calculate the exact horse-power developed, and, knowing what coal is consumed, we can easily find how much is required per hour per horse-power, and compare the figure found with figures which are considered to represent good economy. Large engines will, in general, be found much more economical than small engines, because, although the sources of...


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Product Details
  • ISBN-13: 9781236882424
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 76
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1236882423
  • Publisher Date: 13 Sep 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 154 gr


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