The American house-carpenter; a treatise on the art of building, and the strength of materials (1867)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York, J. Wiley · leaf 64
one radius,and a 2 for the other; i is found by taking b 3 for one radius, anda 3 for the other, always using the foci for centres. Then bytracing a curve through the points, c, g, A, i, b, &c., the ellipsewill be completed. This problem is founded upon the same principle as that of thestring.… … Fig. 86. 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 io c d; join e and c?; bisect e a in/; join/and c, inter-secting e dini; bisect i cin o ; from o,…
Carpentry · Architecture
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