The Copper Queen Practical Mining Course; Object, Rules and Regulations

The Copper Queen Practical Mining Course; Object, Rules and Regulations

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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. 1920 edition. Excerpt: ... I. H. P. of engine. SIZES OF ENGINES---The size of a simple engine, that is, an engine having but one cylinder, is commonly stated by giving the diameter ot the cylinder followed by the length of stroke, both in inches. Thus, a simple engine having a cylinder 12" in diameter and a stroke of 24" would be referred to as a 12"x24" engine. The size of compound and multiple expansion engines are designated in a similar fashion. Thus, a compound engine with a high pressure cylinder 11" in diameter, a low pressure cylinder 20" in diameter and a stroke of 15" would be referred to as an 11"x20"x16." MECHANICAL EFFiCIENC'--This is the ratio of the net horsepower to the indicated horsepower, or it is the percentage of the mechanical energy developed in the cylinder that is utilized in doing useful work. To find the mechanical efficiency divide the net horsepower by the indicated horsepower. PISTON SPEED--The total distance in feet traveled by the piston in one minute. STEAM ENGINE A steam engine is a machine for the conversion of heat into mechanical work, in which the working substance is water and water vapor. A good steam engine should be as direct acting as possible; that is, the connecting parts between the piston and the crank-shaft should be few in number, as each part wastes some power. The moving parts should be strong, to resist strains, and light, so as to offer no undue resistance to motion; parts moving upon each other should be smoothly and truly finished to reduce the resistance to a minimum. The steam should get into the cylinder easily and at the DPODBP time, and the exhaust should leave the cylinder as exactly and as easily. The engine should be capable oi.' being started, ...show more

Product details

  • Paperback | 228 pages
  • 189 x 246 x 12mm | 413g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236842316
  • 9781236842312