The Engineer's Encyclopaedia; Containing a History of the Discovery and Application of Steam, with Its Practice and Achievements from the Earliest Period to the Present Time ...
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The Engineer's Encyclopaedia; Containing a History of the Discovery and Application of Steam, with Its Practice and Achievements from the Earliest Period to the Present Time ...

The Engineer's Encyclopaedia; Containing a History of the Discovery and Application of Steam, with Its Practice and Achievements from the Earliest Period to the Present Time ...


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About the Book

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. 1890 Excerpt: ... 16 = 8-5 x (7-5 x 7-5) = 478 gallons per minute. The work done--II4 x 10 x 478 _. horse-power nearly. 33000 J r 1 This rule evidently allows for waste in the pump, but one-fifth must be added to the sum for the friction of the engine. To find the area of cylinder required to perform a given amount of work.--We may consider the mean pressure in the cylinder as from 14 to 15 lbs. per square inch, and the velocity of the piston from 80 to 85 feet per minute. It must be remembered that the pressure per square inch is derived from the actual water load divided by the area of the piston, and that one-fifth more power must be allowed for friction. Thus the pressure multiplied by the velocity equals so many foot pounds, which may be taken on an average as 1000. Therefore we divide the number of lbs. of water raised 1 foot high by 1000, and the quotient is the area of the cylinder in square inches. For example: --Suppose it be required to find the diameter of a cylinder of a Cornish engine sufficient to raise 7,000,000 gallons of water 120 feet high in 24 hours. Multiply the number of gallons by 10 (the weight in lbs. of a gallon of fresh water), and then by the height; divide the product by the number of hours reduced to minutes, and the quotient gives the number of lbs. raised I foot high per minute, which divided by 1000 gives the area of the cylinder. Thus: 7oooooox, ox,20 = j833333 + I00Q = s833, -44 which equals 86 inches diameter nearly; to which must be added an allowance for the friction of the engine. The divisor used may vary, owing to the pressure and velocity, and on this account three eminent firms have used in their practice 926, 1113, and 1140 respectively; but the average of a number of Cornish engines is 771. Steam valves for Cornish engine: --T


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Product Details
  • ISBN-13: 9781130143386
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 296
  • Spine Width: 16 mm
  • Width: 189 mm
  • ISBN-10: 1130143384
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 531 gr


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The Engineer's Encyclopaedia; Containing a History of the Discovery and Application of Steam, with Its Practice and Achievements from the Earliest Period to the Present Time ...
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