. 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 .. . nsidered in proportioning a suspension bridge are The anchoring masonry, The anchor chains, The towers and plate, The suspension cables, The suspending rods, ^ The stiffening arrangement, The road-way. The data given in the construction of a bridge of thisdescription are The spaD) The load to be supported. The assumed data The varied \me of the width. And t
. 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 .. . nsidered in proportioning a suspension bridge are The anchoring masonry, The anchor chains, The towers and plate, The suspension cables, The suspending rods, ^ The stiffening arrangement, The road-way. The data given in the construction of a bridge of thisdescription are The spaD) The load to be supported. The assumed data The varied \me of the width. And the required elements The length of cable,Lengths of suspending rods, IRON BRIDGES. Angle of tangent of cable at point of suspension with axis of tower,Tension upon the cables,Section of the anchor of anchoring masonry,Size of the towers,Dimensions of trussing and of road-way. 205 OF THE CABLES. 225. The curve formed by the cable of a suspen^^ioIlbridge lies between the parabola and the catenary. Whenloaded the curve is nearly the former, and when unloadedthe latter. Problem 1. Given the horizontal distance between the points of sus-pension and the versed-sine, to find the length of the cablefig. 103. Fig. Represent C E by Z>, and E F by a, and the length of thesemicuive is 2/a> 18 206 HANDBOOK OF RAILROAD CONSTRUCTION. Let the half span be five hundred feet, and the versed-sine or deflection eighty feet, the formula becomes ^^3(500/ =50<^X = feet,which is the half length of cables between towers. Problem 2. 226. To find the length of the suspending rods. Call-ing E the horizontal distance between the vertical suspend-ers, we have the formula X=-riXa, in which we place E, 2 E, 3 E, etc., in place of Y, thus call-ing the rods one hundred feet apart, we have Centre. 00 Rodl. 1002 Rod 2. X a X80 4E^ 2002 -, X 80 500- Rod 3. 9E^3002 Xa ^2X80 500■ Rod 4. 1££2400 2 X a 500 X 80 Rod 5. 25^2500 2 X a 500 X 8
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