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(HOW TO FIGURE HORSE POWERComparatively Kaay Method of Making Calculation With Any Engine Is Available.As an easy method of calculating horse power the following is commended:I Where practicable take an indica-; tion diagram which shows the mean pressure of steam throughout the ! stroke. In order to calculate thmpres-1 sure, ten ordinates are usually Grown across the diagram; the length of these Is measured on a scale representing the pounds per square inch of pressure. The ten numbers thus obtained are added together and the sum divided by ten;-this gives the average pressure per square Inch of ateam throughout the stroke. Calculate the area of the piston in square inches from Its diameter, and multiply this ; by the square inch. This gives the total pressure exerted on the piston. Next multiply the number of revolutions of the engine per minute by twice the length of the stroke in feet; this gives the speed of the piston in feet per minute; multiply thla by the pressure on It in pounds, and the result Is the number of foot pounds of work done on the plstqo per minute.A horse power Is reckoned at 38,000 foot pounds per minute, the number of foot pounds divided by this figure gives the indicated horse power. A portion of this, varying from a third 4o a fifth, is taken ip in overcoming the friction of the working parts of the engine; the remainder only la available for useful work.
Newspaper Details
Libertyville Independent
Libertyville, Illinois, US
Thu, Nov 08, 1917
Page 3
Full Page
Clipped by
Nichole R.
USA 24 Mar 2025
Other Publications Near Libertyville, Illinois
Libertyville Lake County Independent and Waukegan Weekly Sun
Libertyville Independent
Libertyville Lake County Independent
