Identifier: americanengineer68newy (find matches)
Title: American engineer and railroad journal
Year: 1893 (1890s)
Authors:
Subjects: Railroad engineering Engineering Railroads Railroad cars
Publisher: New York : M.N. Forney
Contributing Library: Carnegie Library of Pittsburgh
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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Fig. 6. the same capacity, and with the same speed of rotation willdevelop the same power, with the same initial pressure andratio nf expansion. First, suppose the cut-off to take place at Mand m at one- 506 THE AMERICAN ENGINEER (November, i8g.(.
Text Appearing After Image:
g > o Vol. LXVIII, No. II.) AND RAILROAD JOURNAL. 507 fourth of the stroke ; then the volume of the steam admittedin each case will be 1 cub. ft.. but the areas of the surfaceswhich enclose this 1 cub. ft. will differ considerably, the areasof the two ends and of the belts .4 .If, a m of the barrels being5.54 sq. ft. and 9.78 sq. ft. Therefore, if condensation beproportional to surface, the quantity of steam condensed inthe short-stroke cylinder would, other things being equal, be177 per cent, of that in the long. If, however, the steam, instead of being cut off at one-fourth,were cut off at three-fourths of the stroke, the case would bedifferent. Then the volume of the steam cutoff A y y B,fi u it b would be 3 cub. ft., and the enclosing surfaces 12.62sq. ft., or 4.21 sq. ft. per cubic foot in the case of A B C D,and 13.33 sq. ft., or 4.44 sq. ft. per cubic foot in the case ofabed. Therefore, other things being equal, the condensa-tion in a b c 1/ would be 106 per cent, of that in

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