Factory and Industrial Management Volume 24

Factory and Industrial Management Volume 24

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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. 1903 edition. Excerpt: ...that any attempt to measure the area as a whole by the planimeter will not give the true mean effective pressure throughout the stroke. Various methods may be devised to overcome this difficulty, these being based on the division of the diagram into several portions, in each of which the scale may be assumed to remain constant. Each of these portions is then measured separately, using the corrected value of the scale belonging to each, the sum of the several portions being taken as the corrected area of the whole. By using the corrected values for various portions of the range of the spring movement it is also possible to find points in the curve corresponding to the corrected pressure for determinate points in the stroke, and thus a critical examination of the action of the steam at any point in the cylinder may be made. When it is considered that the indicator diagram is often used for the measurement of power for engines in which the effect of the steam upon a piston several feet in diameter is referred to the action of an indicator piston of about half-an-inch in diameter it will be seen how essential it is that the limit of error should be made as small as possible. The engineer is working at the short end of a very long lever, and every error in the instrumental work is multiplied many times. Herr Roser's paper will be accepted as an excellent contribution to methods which are rendering the work of the steam engineer as precise as that of the chemist or physicist. SUBMARINE TORPEDO BOATS. THE DEVELOPMENT OF VESSELS FOR SUBMARINE WARFARE IN EUROPEAN AND AMERICAN NAVIES. Society of Naval Architects and Marine Engineers. E success which has attended the J. trials of the submarine boats "Moccasin" and "Adder," the...
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Product details

  • Paperback | 572 pages
  • 189 x 246 x 29mm | 1,007g
  • United States
  • English
  • black & white illustrations
  • 1236812298
  • 9781236812292