. Railway and Locomotive Engineering. rovement on the present J. Pr.\tt. Pater son, N. J. Entering Pistons and Welding ; Enclosed are photograph and drawingsof a device for entering pistons in cylin-ders, and which is being very success-fully used here, especially on the larger class of locomotives where the cylinderrings are not so easily collapsed as arethe smaller variety. As the illustrationssliow the details of the device no lengthydescription is is also a photograph of a OF DEVICE FOR ENTERING PIS-TONS IN LOW PRESSURE MALLETS. I hermit w
. Railway and Locomotive Engineering. rovement on the present J. Pr.\tt. Pater son, N. J. Entering Pistons and Welding ; Enclosed are photograph and drawingsof a device for entering pistons in cylin-ders, and which is being very success-fully used here, especially on the larger class of locomotives where the cylinderrings are not so easily collapsed as arethe smaller variety. As the illustrationssliow the details of the device no lengthydescription is is also a photograph of a OF DEVICE FOR ENTERING PIS-TONS IN LOW PRESSURE MALLETS. I hermit weld made on the front rest and frame cross-tie on a Mallet((.mpound locomotive, and which effecteda saving of $300 by so doing. The very?-rcccssful weld was made under the di-rection of Mr. R. L. Woodman, our fore-man blacksmith. Ed. MuRR.^v, M. M.,C. & O. Forge, Va. Theory of the ; The apparenty paradoxical action ofthe injector by which steam from the boiler forces water against its own. (?il WITH ATTACHED. pressure is explained by Robert Grinvshaw, an eminent authority, as a questioaof velocity not of pressure. At a given-pressure steam escaping from an orifice-has a higher velocity, say ft. perminute, than water under the same pres-sure, say 150 feet. In issuing from the-ir jector nozzle the steam strikes the waterthat also enters the combining-tube, con-denser and at the same time imparts tothe feed-water together with the con- 122 RAILWAY AND LOCOMOTIVE ENGINEERING. April, 1912. denser, its own velocity Unis driving itinto the delivery-tube, and as this feedwater lias a higher velocity than waterwould have under the given steam pres-sure in issuing from the boiler it canovercome the pipe friction, raise thecheck valve and enter the boiler againstthe latters pressure. The continual condensation of thesteam causes a vacuum to fill, which newwater rushes in from the feed. There isalso another element entering into
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