The American house-carpenter; a treatise on the art of building, and the strength of materials (1873)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York : J. Wiley · leaf 311
nches. Example.—Suppose the curve of the rib to be describedwith a radius of 100 feet, then what should be the depth ? Theradius in feet, 100, multiplied by 005, gives a product of 5 inches.White pine or oak timber, 5 inches thick, would freely bend tothe above curve ; and, if the required depth of… … 404.—When the span is over 250 feet; a framed rib, formed ac>in Fig. 256, would be preferable to the foregoing. Of this, theupper and the lower edges are formed as just described, by bend-ing the timber to the proper curve. The pieces that tend to thecentre of the curve, called radials, are…
Carpentry · Architecture
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