The American house-carpenter; a treatise on the art of building, and the strength of materials (1867)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York, J. Wiley · leaf 306
Fig. 253. should not be attempted, as it is evident that such a system olframing is capable of a tremendous lateral thrust. … Fi§. 254. 401.—Fi^. 254 represents a wooden bridge in which a built-rib,(see Art. 385,) is introduced as a chief support. The curve ofequilibrium will not differ much from that of a parabola: this,,therefore, may be used—especially if the rib is made gradually alittle stronger as it approaches the…
Carpentry · Architecture
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