Cassier's magazine (1904) (14768771332)

Identifier: cassiersmagazi2719041newy (find matches)

Title: Cassier's magazine

Year: 1891 (1890s)

Authors:

Subjects: Engineering

Publisher: New York Cassier Magazine Co.

Contributing Library: Smithsonian Libraries

Digitizing Sponsor: Smithsonian Libraries

Text Appearing Before Image:

FIG. 4.—ELEVATION AND PLAN OF LONG-STROKE AIR PUMP MADE BY MESSRS. POLLIT & WIGZELL, LTD. lightning rapidity of cut-off, the abso-lute simplicity of the valve itself, itslarge wearing surfaces, its compactness,and its small clearance spaces,—all thesehave for fifty years and more popularisedit in every part of the world where steamengines are made or used. But it nolonger holds undisputed possession ofthe field. On the Continent of Europethe drop valve has completely ousted it,and in British practice the use of this israpidly extending. Sliding surfaces arenot well adapted for use with superheatedsteam, but the latter appears to have 424 CASSIERS MAGAZINE

Text Appearing After Image:

THE MODERN HORIZONTAL STEAM ENGINE 425 little effect upon the narrow surfaces ofthe double-seated, conical drop valve.This is probably the prevailing cause forthe preference now given to the lattersystem, although there are other rea-sons. For example, there is the strik-ing simplicity and comparative silenceof the lifting and releasing motions, ascompared with the mechanism of theCorliss valve. The possibilities in theway of reducing the wasteful effects ofclearance by skillful designing in thedrop-valve system have hardly yet beenreached, but already it has outclassedthe Corliss in this respect. It is in these two particulars, the frameor bed of the engine and the steam dis-tributing mechanism, that the progressof the last few years is most apparent.For the rest, it seems that a careful ex-amination of the various types here illus-trated will show what a striking amountof care and thought has been expendedin all details tending to ensure the run-ning of the engines for long periodsw

cassiers magazine 1905 horizontal stationary steam engines internet archive document cassiersmagazi 2719041 newy book illustrations engineering machines technology history of technology high resolution images from internet archive

1904

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