Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 61
dius, and a 2 for the other; i is found by taldng b 3 for one radius, and a 3 for the other, always using the foci for centres. Then by tracing a curve through the points, c, g, h, i, b, &c., the ellipse will be completed. This problem is founded upon the same principle as that of thestring.… … 120.—To describe a figure nearly in the shape of an ellip-sis, by a pair of compasses. Let a b and c d, {Fig. 86,) begiven axes. From c, draw c e, parallel to ab ; from a, draw a e,parallel to c d; join e and c?; bisect e a in/; join/and c, inter-secting e dini; bisect icino; from o, draw og, at…
Carpentry · Architecture
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