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 190
lars from the several points of division in a b,at the points, o, o, o, ifcc. Then a curve traced through thesepoints will be the one required. 308.—Small domes to light stairways, &c., are frequently madeelliptical in both plan and section; and as no two of the ribs inone quarter of the dome… … Fig. 2-1 of one of the ribs. Then take e f for the transverse axis andtwice the rise, o g, of the dome for the conjugate, and describe,(according to Art. 115, 116, &c.,) the semi-ellipse, e g f, whichwill be the curve required for the rib, e g f. The other ribs arefound in the same manner. b 4
Carpentry · Architecture
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