Practical Instructions for Detailing Machinery, Instructions for the Execution of Various Works in Iron

Practical Instructions for Detailing Machinery, Instructions for the Execution of Various Works in Iron

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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. 1871 edition. Excerpt: ... the mean pressure on the piston the mean force on the crank pin. 3-1416)2-00000(0-636 188496 115040 94248 207920 188496 19424 0-636 is then the constant factor which we may place in a general rule. Eule.--The mean total pressure on the piston of a steam engine being given to find the mean pressure on the crank pin, multiply that on the piston by 0-636. In the above case we find, excluding allowance for friction, that 498 lbs. is provided. 498 lbs. load 636 2988 1494 2988 316-728 lbs. on each crank pin 2 633-456 lbs. on two crank pins. From which it will be seen that we have sufficient power for the work. In respect to air engines we have not much to say, as they are not used to any considerable extent (in England at all events), and those that are in use are of small size. We must, however, point to a few matters connected with them of practical importance. In the early air engines the difficulty most difficult to contend with was the destruction of packing and working parts by the high temperature necessary to be used in order to obtain the requisite working pressure, and when we consider that by raising air 480 degrees, we only obtain an additional pressure of 15 lbs. on the square inch, it is evident that either high temperatures or very large machinery must be used. In order to keep the heat away from the working parts, the well-known plunger-shaped appendages are always attached to air engine pistons, except in the case of some few which, like Mr. Gill's, worked under water, the elastic fluid used being a mixture of heated air and steam. During the past ten years another description of socalled air engine has come to some extent into use; the air is forced into the furnace which is closed by an air-tight door, and the air heated by more

Product details

  • Paperback | 44 pages
  • 189 x 246 x 2mm | 95g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236621832
  • 9781236621832