back, and exhaust steam goes out through B and D. The motion of the piston is communicated by a drivingrod to the machinery to be run. The unit for measuring the work done by a steamengine is called a horse-power. This equals 33,000 foot-pounds per minute, and is the standard wherever theEnglish… … Fig. 55. Heat. 79 stroke, and N the number of strokes per minute, thenumber of foot-pounds of work the engine can do willequal P x L x A x N, and the horse-power of the enginewill h^ P X L X A X A^divided by 33,000. Example. — The piston of an engine is 18 inches in diameter and hasa 30-inch…
Physics
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