The American house carpenter: a treatise upon architecture, cornices and mouldings, framing, doors, windows and stairs. Together with the most important principles of practical geometry (1852)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York, J. Wiley · leaf 195
OOOll. Example.—What should be the area of the ribs for abridge of 200 feet span, to rise 15 feet, and be 30 feet wide, with3 curved ribs ? The half of the span is 100 and its square is10,000; this, multiplied by 30, gives 300,000, and 15, multi-plied by 3, gives 45; then 300,000, divided by 45,… … Fig. 229. 316.—The above rule gives the area of a rib, that would be re-quisite to support the greatest possible uniform load. But inlarge bridges, a variable load, such as a heavy wagon, is capableof exerting much greater strains; in such cases, therefore, therib should be made larger. The…
Carpentry · Architecture
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