Publisher's Synopsis
Excerpt from The Transactions of the Academy of Science of Saint Louis, Vol. 5: 1886-'91
The difference between the two belt-pulls, or the load on the brake, is represented by w, r being the brake-arm, or radius of the driving-wheel. If the belt-pulls are F' and fi, then F F to. It is supposed also that the mean effective pres sure required to drive the engine when w an: a is constant for all speeds. In an engine with balanced valves and where the amount of lubrication used increases with the speed, this assumption may be tolerated for a general treatment of the case, although the peculiarities of engines will doubtless cause them to depart from this assumption in a more or less irregular way. Engines are usually built for definite speeds, and often behave poorly when run at widely different speeds from those for which they were designed.
For these reasons, some portions of this treatment cannot lay claim to very great precision. It will serve mainly to present the general conditions of the problem, and may serve as a basis for investigating the peculiarities of individual engines.
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