A manual of the steam-engine. For engineers and technical schools; advanced courses by Thurston Robert Henry 1839-1903

Author:Thurston, Robert Henry, 1839-1903
Language: eng
Format: epub
Tags: Steam-engines
Publisher: New York : J. Wiley & sons
Published: 1891-03-25T05:00:00+00:00

set of curves shown in various publications, but probably first laid down in this form by Mr. Porter.* AB exhibits the initial volume, as does also CD ; AD and BC represent the initial pressure; EF is an ordinate, taken at convenience; and the terminal ordinates are GH, 7J/, and LK. OR is taken at half-stroke; while CN is the axis of the equilateral hyperbola, AOG t the upper curve, of which CB and CH are asymptotes. Ordinates measure absolute pressures in pounds

FIG. i34--TH« TMBI FII 1111 mil

per square inch : abscissas represent volumes of unity of weight (i lb.lt Thus BA is the volume (4.73 cu. ft.) of one pound of steam at a total pressure of 90 pounds per square inch; ABCD is the external work done in its production. It is this curve which is commonly assumed to be that of the expansion of steam.

The curve AOI is the curve of dry and saturated steam, its co-ordinates representing the simultaneous pressure and volume of the fluid when in contact with the mass of water from which it is produced. The expansion is less, and the rate of fall of pressure greater, than if it were to follow the law

* Steam-engine Indicator; p. 1*3.

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