. Engineering practice and theory, for steam engineers ... . fore. Such a rule would be convenient in estimatingthe power of an engine before its exact speed wasdetermined, or in places where different speeds areemployed to meet the requirements of the service. The horse power constant of the low pressurecylinder of a compound engine, may be found ineither of the above ways. Suppose that the engine we have been consider-ing is the high pressure side of a compound engine,and the low pressure side has a cylinder 48 inchesin diameter with the same stroke. Area of cylin-der 1, square inches,
. Engineering practice and theory, for steam engineers ... . fore. Such a rule would be convenient in estimatingthe power of an engine before its exact speed wasdetermined, or in places where different speeds areemployed to meet the requirements of the service. The horse power constant of the low pressurecylinder of a compound engine, may be found ineither of the above ways. Suppose that the engine we have been consider-ing is the high pressure side of a compound engine,and the low pressure side has a cylinder 48 inchesin diameter with the same stroke. Area of cylin-der 1, square inches, and 1,^33,000= which is the horse power constantfor the low pressure cylinder. If the mean effective pressure is 10 pounds, x 10 = 307 horse power. Adding these twotogether we find the total power to be 307 +3°7 =614 indicated horse power. The intermediate and low pressure cylinders oftriple and quadruple expansion engines may betreated in the same way, whether they are run con-densing or non-condensing. 68 ENGINEERING PRACTICE. THE LIPPINCOTT PLANIMETER. AND THEORY. 69
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