Stationary steam engines, simple and compound; especially as adapted to light and power plants (1899)
Thurston, Robert Henry, 1839-1903 · New York, J. Wiley & Sons; [etc., etc.] · leaf 232
y Willans in his extended experiments,that after a certain point of cut-off is reached it is moreeconomical to reduce the pressure than to increase thenumber of expansions, as would be the case if the cut-offwas made shorter ; and in correspondence with experimentsmade by Mr. E. J. Armstrong in… … Straight-line Diagram. Another change recently made has been the introductionof a separate exhaust-valve, making the steam-distribu-tion nearly the same as in the Porter-Allen engine exceptthat the cut-off is carried through a wider range, varyingfrom three-quarter stroke to zero, and, too, the…
Steam-engines
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