Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 193
OOll. 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 7 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 j then 300,000, divided by 45,… … 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 greatest…
Carpentry · Architecture
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