Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 105
t is also very economical when therailroad has to run along a side hill, because I save the Avhole of thegrading necessary with an ordinary railroad. I will now explain how I would build a bridge with that same systemof triangular truss. First, if the span is 20 feet I will give it this… … the points d and/of the wire a, d, b,f, c, by another wire d, e,/, andputting two small posts in d and /, the rail will be supported every5 feet the same as in the 10 feet span. If I have to build a bridge 160 feet long in one span, with a deflec-tion of 8 feet, or -^q, I will build it as shown in…
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