Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 195
ches. 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… … Fig. 230. 318.—When the span is over 250 feet, b.framed rib, formed asin Fig. 230, 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,…
Carpentry · Architecture
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