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Pain, William (1730?-1790?) / The practical house carpenter, or, Youth's instructor containing a great variety of useful designs in carpentry and architecture; the five orders laid down by an entire new scale.
(1792)
Centering for Groins, Arches, and use of the Trammel., pp. Plate 1-To face Plate III.
Page Plate 1
Plate 1. Fig E is a groin on a circular plan with references for placing the jack ribs as a, c, d, e, f the ribs and hips are traced from the rib A as 1, 2, 3. 4, 5, 6, 7, 8, 9, 10, 11, 12. Fig B is a groin ceiling on bevel plan the hips and jack ribs traced from the rib C as 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
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