. Handbook of railroad construction; for the use of American engineers. Containing the necessary rules, tables, and formulæ for the location, construction, equipment, and management of railroads, as built in the United States .. . Fig. cept where the truss itself rests. The common T abutment 244 HANDBOOK OF RAILROAD CONSTRUCTION. originated by Captain John Childe, and now in very exten-sive use, seems to fulfil any requirement of a good abut-ment, see fig. 122, page 242. B B is the bridge seat, andthe mass T T takes the place of wings. The difference oflevel of the top and of the bridge
. Handbook of railroad construction; for the use of American engineers. Containing the necessary rules, tables, and formulæ for the location, construction, equipment, and management of railroads, as built in the United States .. . Fig. cept where the truss itself rests. The common T abutment 244 HANDBOOK OF RAILROAD CONSTRUCTION. originated by Captain John Childe, and now in very exten-sive use, seems to fulfil any requirement of a good abut-ment, see fig. 122, page 242. B B is the bridge seat, andthe mass T T takes the place of wings. The difference oflevel of the top and of the bridge seat depends upon thedifference between the height of the bearing of the lowerchord of the bridge, and grade. The line of contact betweenthe earth and the wall is shown by 5 s s s. The lengthof the top of the masonry is thus. Suppose the slope to beone and one half to one, and the whole height thirty feet,the whole horizontal length of slope is then forty-five feet;from this we take the sum of the horizontal distances, s sand s s, and suppose these to be, respectively, six and eightfeet, we have the whole operation thus: — 30 X 11 — 6 + 8 = 45 — 14 = 31 feet. It may be advisable in very high abutments to lighten themasonry by a
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectrailroadsdesignandco
