Haswell's engineers' and mechanics' pocket-book .. (1844)
Haswell, Chas. H. (Charles Haynes), 1809-1907 · New York, Harper & brothers · leaf 63
CONIC SECTIONS, 55 Draw an isosceles triangle, A B D, whose base shall be equal tothat of the proposed parabola, and its altitude, C B, twice that of it. Divide each side, A B, D B, into 8, or any number of equal parts;then draw lines 1 1, 2 2, 3 3, &c., and their intersection will definethe… … Make A B the transverse diameter, and C D, perpendicular to it,the conjugate. Bisect A B in 0, and from 0, with the radius O C or 0 D, de-scribe the circle D / c F, cutting A B produced in F and /, whichpoints will be the foci. In A B produced take any number of points, n n, &c., and fromF and…
Engineering · Mechanical engineering
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