A rough method of estimating the horse-power of a steam engine is to multiply the square of the. diameter of the cylinder in inches by 0.755, and this product by the mean engine pressure and the last product by the piston travel in feet per minute. Divide the last product by 33,000 for the indicated horse-power. In the absence of logarithmic formulae or expansion table, multiply the boiler pressure for §■ cutoff by 0.91, for A cut-off by 0.85, | cutoff by 0.70, 3-10 cut-off by 0.56. This will give the mean engine pressure per square inch near enough for ordinary practice, for steam pressures between 6*o and 100 pounds, always remembering that the piston travel is t.wice the stroke multiplied by the number of revolutions per minute. ■ •
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Auckland Star, Volume XXXVII, Issue 230, 26 September 1906, Page 3
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126Untitled Auckland Star, Volume XXXVII, Issue 230, 26 September 1906, Page 3
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