. A practical treatise on railways, explaining their construction and management ... being the article "Railways" in the seventh edition of the Encyclopedia britannica, with additional details . nder the boileris compressed into its minimum space, and more room forit would be a great advantage, if it does not induce an in-commensurate loss in other ways. With respect to the form of the rail, it can be proved thata fish belly has greater strength, weight for weight, thanany other. A 60lb. fish belly at three-feet bearings, rolledwith a lower web, would be the best form of all; and thishas been
. A practical treatise on railways, explaining their construction and management ... being the article "Railways" in the seventh edition of the Encyclopedia britannica, with additional details . nder the boileris compressed into its minimum space, and more room forit would be a great advantage, if it does not induce an in-commensurate loss in other ways. With respect to the form of the rail, it can be proved thata fish belly has greater strength, weight for weight, thanany other. A 60lb. fish belly at three-feet bearings, rolledwith a lower web, would be the best form of all; and thishas been effected, as the original Liverpool and Manchesterrails had partially this shape. The question, however, mustbe looked at in conjunction with the length between thesupports. We have given below those forms most approv-ed of in practice, and have added that in use on the GreatWestern Railway, which is however light, and does notstand well, three feet having been the original distance of thebearings. Fig. 3 is the old Liverpool and Manchester rail, laid downat three-feet bearings ; weight thirty-three yard, withsquare joints. This rail was rolled with a lateral swell at the Fig. bottom, which on one side was continued the whole length,but on the other did not quite reach the chair. One sideof the chair was cast with a cavity, into which the lateralswell fitted, and the opposite side had a nearly similar open-ing, in w hich was driven an iron key, shaped like a wedge. 80 RAILWAYS. which, entering in a longitudinal direction, not only forcedthe swell into the cavity which was formed to receive it, butby this means, at the same time, kept the rail down in thechair. Fig. 4. Loshs patent rail, in which he sought to gain astill more powerful mode of keeping the rail down in thechair, by having his key tapered vertically as well as longi-tudinally, so as to act as a wedge downwards, as well as inthe direction of its length ; whilst, at the same time, the ne-cessary expansion
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