. The railroad and engineering journal . am and Edward W. Chapman, dated December 30, this it is said : Fig. VIII. (not given here) shows a carriage of six wheels forthe engine, which may rest equably, or nearly so, on each of itswheels, and move freely round the curves or past the angles ofa railway, i, i, the fore pair of wheels, are, as usual on rail-ways, fixed to the body of the carriage ; 2, 2, and 3, 3, theother two pair, are fixed (on axles parallel to each otherj to a Vol. LXIV, No. 3.] ENGINEERING JOURNAL. 5 separate frame, over which the body of the carriage should beso pois
. The railroad and engineering journal . am and Edward W. Chapman, dated December 30, this it is said : Fig. VIII. (not given here) shows a carriage of six wheels forthe engine, which may rest equably, or nearly so, on each of itswheels, and move freely round the curves or past the angles ofa railway, i, i, the fore pair of wheels, are, as usual on rail-ways, fixed to the body of the carriage ; 2, 2, and 3, 3, theother two pair, are fixed (on axles parallel to each otherj to a Vol. LXIV, No. 3.] ENGINEERING JOURNAL. 5 separate frame, over which the body of the carriage should beso poised, as that two-thirds of its weight should lie over thecentral point of the four wheels, where the pivot 4 is placed,and the remaining third over the axis i, i. The two-thirdsweight of the carriage should rest on conical wheels or rollers,bearing upon the curved plates r, r, so as to admit the ledges ofthe wheels, or those of the way, to guide them on its curves orpast its angles, by forcing the transom or frame to turn on the IFig- 4-. pivot, and thus arrange the wheels to the course of the way,similarly to the carriage of a coal-wagon. And if the weight ofthe locomotive engine should require eight wheels, it is only req-uisite to substitute in place of the axis i, I, a transom, suchas described (laying the weight equably upon both) and then sim-ilarly to two coal-wagons attached together, the whole four pairof wheels will arrange themselves to the curves of the railway. There is no evidence to show that the Chapman planwas ever put into practice. It was also brought out in the Winans litigation that inthe early part of 1830, long timbers were carried on theBaltimore & Ohio Railroad on two four-wheeled cars, onwhich bolsters were placed, with a round pin passing downthrough a plate attached to the truck ; string-pieces from20 to 45 ft. long were then placed on the bolsters. Eachof the two four-wheeled cars were thus enabled to adjustthemselves to the vertical inequalities and
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
