The tinman's manual and builder's and mechanic's handbook : designed for tinmen, japanners, coppersmiths, engineers ... with compositions and receipts for other useful and important purposes in the practical arts (1861)
Butts, I. R. (Isaac Ridler), 1795-1882 · Boston : I.R. Butts & Co. · leaf 23
An oval may be formed by joining different seg-ments of circles, so that their meeting shall not be perceived, but form a contin-uous curve line. All ellipses are ovals, but all ovals are not ellipses; for theTerm oval may be applied to all egg-shaped figures, those which are broader atone end than… … To describe an ellipse of any length and width, and by it to describea pattern for the sides of a vessel of any flare. First draw an indefinite line DE perpendicular to the line AB, andfrom C, the point of intersection, as a centre, describe a circle FO,having the diameter equal to the length of…
