Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 188
lars from the several points of division in a b,at the points, o, o, o, (fee. 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… … of one of the ribs. Then take e / 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.
Carpentry · Architecture
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