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Hawkins' Indicator Catechism; A Practical Treatise for the Use of Erecting and Operating Engineers, Superintendents, Students of Steam Engineering, Etc

Hawkins' Indicator Catechism; A Practical Treatise for the Use of Erecting and Operating Engineers, Superintendents, Students of Steam Engineering, Etc


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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. 1899 edition. Excerpt: ...effect of the back pressure is least. If at the end of the stroke the steam has been expanded to atmospheric pressure in a non-condensing engine, there will be no immediate outrush of steam from the cylinder, because there is no greater pressure in the cylinder than that of the atmosphere into which the steam must flow. The steam must therefore be pushed out by the piston, and the resistance to its movement will depend upon the length and directness of the exhaust pipe, as well as its size. The compression of the steam by the piston pushing it out of the cylinder against the resistance to flow through the pipes and passages, will show on the indicator diagram in raising the line of counter-pressure above the atmospheric line. Note.--The actual tendency of a piston to move depends on the difference in pressure upon its two sides. If there were 30 pounds pressure in both ends of the cylinder at once, the piston would not move any more than though there were no pressure at all. If there were 30 pounds pressure on one side and 15 pounds on the other, the force with which the piston would tend to move would be the same as though there were 15 pounds on one side and nothing on the other. In other words, the effective pressure is the unbalanced pressure, or the difference in pressure between the two sides. THE EXHAUST LINE. In a well-proportioned engine at moderate piston speeds, and exhausting through a short and ample exhaust pipe, this moving pressure will not be noticeable with an ordinary spring, and the line of counter0pressure will merge into the atmospheric line. In less advantageous circumstances, however, the back-pressure line will be elevated above the atmospheric line. Sometimes a card is found where the back0pressure line starts in...


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Product Details
  • ISBN-13: 9781234375065
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 24
  • Spine Width: 1 mm
  • Width: 189 mm
  • ISBN-10: 1234375060
  • Publisher Date: 22 Jan 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 64 gr


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Hawkins' Indicator Catechism; A Practical Treatise for the Use of Erecting and Operating Engineers, Superintendents, Students of Steam Engineering, Etc
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