The Steam-Engine Indicator

The Steam-Engine Indicator

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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. 1900 edition. Excerpt: ...m. e. p. 24.0--16.76 = 7.24 pounds. The column headed Fig. 42 gives the several widths for the corresponding diagram, and the column headed Fig. 43 does the same for its diagram. The resultant m. e. p. obtained by subtracting the m. e. p. for the secojid column from the m. e. p. for the first column is the same as that already found from Fig. 41. Under the heading of Differences are given the results obtained by subtracting the numbers of the second column from those in the first column. These differences are clearly the widths of Fig. 41 at the corresponding lines; the differences C are negative for the 6th, 7th, 8th, 9th, and 10th lines corresponding to the widths of the loop for Fig. 41. The calculation at the right hand is evidently a transcript of the calculation for Fig. 41, and would give a correct result whether or not there is a loop, for without a loop there would be no negative differences. Finally it is evident that the subtraction of widths of the loop in the calculation for Fig. 41 is a purely arithmetical operation, due to the fact that the back-pressure happens to be higher than the end of the expansion-line. It is evident that the mean width of an indicator diagram can be obtained, when the area in square inches is known, by dividing its area by the length in inches. The area can be conveniently measured by aid of a planimeter, which will now be described. Amskr Planimeter.--It is customary to determine the mean effective pressure of indicator diagrams from the area of the diagram measured by aid of a planimeter like that represented by Fig. 44. This instrument has two arms, the tracing-arm HF and the guiding-arm HP, hinged together at H. The Fig. 44. guiding-arm has a needle-point at P which serves as a pivot to locate the...
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Product details

  • Paperback | 28 pages
  • 189 x 246 x 2mm | 68g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236588754
  • 9781236588753