. 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 .. . d, 64; e, 78 ; /, 92 ; and g, 106 ;and the weights correspondingthus, a, 25 : 20 : : 6000 : 4800. h, 37 : 20 : : 6000 : 3243. c, 49 : 20 : : 6000 : 2450. d, 64 : 20 : : 6000 : 1870. e, 78 : 20 : : 6000 : , 92 : 20 : : 6000 : , 106 : 20 : : 6000 : 1132. WOODEN BRrDGES. 167 In fig. 69 A, assume the foot of the fifth brace (B) as thecentre of pressure, and a
. 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 .. . d, 64; e, 78 ; /, 92 ; and g, 106 ;and the weights correspondingthus, a, 25 : 20 : : 6000 : 4800. h, 37 : 20 : : 6000 : 3243. c, 49 : 20 : : 6000 : 2450. d, 64 : 20 : : 6000 : 1870. e, 78 : 20 : : 6000 : , 92 : 20 : : 6000 : , 106 : 20 : : 6000 : 1132. WOODEN BRrDGES. 167 In fig. 69 A, assume the foot of the fifth brace (B) as thecentre of pressure, and adding the moments, (or productsof vertical components on the braces by their distance fromB,) and we have the sum on the land side 18,928, and onthe water side 16,930; showing that the centre is taken toofar from the land side. In the same manner A will befound too far from the land side. A third trial will givethe place. Fig. 69 B, shows vi^. 69b. the manner ofsplicing the archbraces; being sub-jected to compres-sion, they arespliced in thesame manner asthe upper C, shows the lower chord i,,,6yc. spliced. Figs. D and E, the connection of the posts, chord,and lattice. Figs. F, G, and H, the casting for applying. Fig. 69 D. Fig. 69 E. Fig. 69 F.
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectrailroadsdesignandco
