. American engineer and railroad journal . ince been .;alled upon to undergo. Although the oil cylinder dynamometer is generally consid-ered the best suited for this class of work, its advantages arenot as great when used with the Mallet compound type of loco-motive as with the ordinary simple engine. The former givesa very steady, even pull, is not subject to any consider^ible capacity of 110,000 lbs. is in. This gives a total movementof inches to the pen point. An inspection of the drawing will show that an underframehas been designed for this car which will assure perfect align-me
. American engineer and railroad journal . ince been .;alled upon to undergo. Although the oil cylinder dynamometer is generally consid-ered the best suited for this class of work, its advantages arenot as great when used with the Mallet compound type of loco-motive as with the ordinary simple engine. The former givesa very steady, even pull, is not subject to any consider^ible capacity of 110,000 lbs. is in. This gives a total movementof inches to the pen point. An inspection of the drawing will show that an underframehas been designed for this car which will assure perfect align-ment and rigidity of the whole structure. It consists principallyof a very heavy, strongly braced box girder center sill, built upof two 15 in., ^3 lb. channels, extending continuous the fulllength of the car, a distance of 39 ft. 6 in., the web of eachchannel being reinforced for its full length with a V2 in. x 12 These channels are spaced 14 in. apart and cover plates^4 in. X 21 in. are riveted on top and bottom. The superstruc-. , OF NEW DYNAMOMETER CAK. 177 178 AMERICAN ENGINEER AND RAILROAD JOURNAL. May, IjU. ture of the car is of wood and therefore the remainder of tlieuiiderfranie is of comparatively light construction. The sidesills are 6 x 4 x ^ in. angles continuous for the full length ofthe car body and the end sills are 6 in, channels. The bolstersand two cross bearers, spaced equally between, are of the simpletruss type, the bolsters having a Ji x J2 in. tension memberand a I X 12 in. compression member. The cross bearers havea ^ in. top plate and a Vs in- bottom plate 6 in. in width, flieupper members of both the bolsters and cross bearers pass through openings cut in tlie center sill channels and a stiffeningand reinforcing casting is inserted at this point. Supported on this steel underframe are six longitudinal wood-en sills, 4x6 in. in section. These are securely bolted andfastened to the steel members, especially to the side sills,
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
