Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 159
[VII, § 127 III» Numerous Centeks (Fig. 138). The major and minoraxes are given. The first step is to locate the foci, / and /(§ 123). Next locate a number of points, a, h, c, etc., which areknown to lie on a true ellipse (§ 124, II). At the points thuslocated, draw normals to the ellipse, ah, hi,… … cj parallel to gf. If g and / are known, the line cj can be drawnparallel-to af without actually drawing the line gf, thus simplify-ing the drawing and shortening the work. 128. To draw the Projections of a Circle inclined in anyManner to H and V. The key to this problem Hes in the factthat, in…
Geometry, Descriptive
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