Practical Mechanics and Allied Subjects
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Practical Mechanics and Allied Subjects

Practical Mechanics and Allied Subjects


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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. 1915 edition. Excerpt: ...motor it was found that with a speed To find the pull produced at the end of a given lever at a given speed and horsepower we have by transposing the horsepower rule, horsepower Writing this equation for the length of lever arm "L" we have and for the revolutions per min., we have horsepower X 33,000 These rules enable us to find any one of the variable quantities in the rule in terms of the other quantities. Revolutions per min. = PROBLEMS 18. What pull "P" is produced on the end of a 4-ft. brake lever when the machine pulley is making 250 r.p.m. and machine is delivering 8 h.p.? 19. Find the brake horsepower of a steam engine running at 250 r.p.m. and exerting a pull of 80 lb. at the end of a lever 6 ft. long? 20. What length of lever arm is required for a pull of 18 1b., with a speed of 180 r.p.m. and a load of 2 h.p.? The brake horsepower is the power of an engine or motor or water wheel available for use at the machine pulley and does not include the power lost in the machine itself through friction. If in a steam engine we found the horsepower developed in the cylinder and called the cylinder or indicated horsepower we would find that this power is greater than the brake horsepower by the amount of power lost in friction in the engine mechanism between the cylinder and the fly-wheel or pulley. The horsepower thus lost is called the frictional horsepower. In finding the indicated or cylinder horsepower of an engine we use a steam indicator or as it may be called, a recording steam gauge which takes a record of the steam pressure in the cylinder throughout the stroke of the piston. Such a card.diagram or record is shown in Fig. 100. In making a test indicator cards are taken at each end of the cylinder. From...


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Product Details
  • ISBN-13: 9781230025926
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 38
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1230025928
  • Publisher Date: 13 Sep 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 86 gr


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