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 204
tenonon the end, the area of tlie shoulders, instead of a section of thewhole piece, must be equal to the amount given by the rule. 329.—In the construction of arches, the voussolrs, or arch-stones, are so shaped that the joints between them are perpen-dicular to the curve of the arch, or to its… … 330.— To find the directiou of the joints for an ellipticalarch. A joint being wanted at «, [Fig. 234,) draw lines fromthat point to the foci, /and/; bisect the angle,/a/ with theline, ah ; then a b will be the direction of the joint. 331.— To find the direction of the joints for a parabolic arch.A…
Carpentry · Architecture
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