Identifier: americanengineer84newy (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. 5.—DIAGRAM OF BENDING MOMENT AND SHEARING FORCES. have been worked out considering the frame as a beam supportedat four points (where it rests on the springs), the re-action beingequal to the sum of the loads supported by the springs. 1 his diagram shows that the proportion of the boiler weightcarried by the front engine is concentrated at a point midwaybetween the first and second wheels or 31 in. ahead of the middlewheel, and as this is the only point on the front truck at whicnthe boiler is supported the weight must be such that its momentabout the center of the truck will equal the moment of the weightof the front truck itself, acting at the distance its center of gray- \M: r AMERICAN ENGINEER AND RAILROAD JOURNAL, MARCH. 1910
Text Appearing After Image:
—-4 sir x :> T 2iiJr 1- «tr 1^ ELEVATION, SECTIONS, AND PARTIAL PLAN AT CYLINDERS OF MALET COMPOUND (0-6-6-0) LOCOMOTIVE, :, CANADIAN PACIFIC RAILWAY. __X March, 1910. AMERICAN ENGINEER AND RAILROAD JOURNAL. S5 ity is located in the rear of the center of the truck. On mostMallet locomotives now in service this is not the case; the actualpoint of support of the boiler on the frames is set forward (con-sidering a truck with the cylinders at the front) of the virtualpoint sufficiently far to make the moment of the truck weightconsiderably greater; this is done to prevent rocking in a longi-tudinal direction, and, of course, tends to allow the truck to dropat the front, to correct which, a suspension bolt working on ballscats connects the lower rail of each back engine frame to theupper rails of the front engine. Any tension put on them by screw-ing up on the adjusting nuts pulls down on the rear end of thefront engine frame correcting the efifect of the center of gravityof the fron

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