Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 155
th will cause the pencil to de-scribe an ellipse,tf...,- II. By Estab- lishing Points.(1) First method.In Fig. 133, let aband cd be the givenaxes. Construct arectangle efgh onthese diameters.Divide ao and aeinto the same num-ber of equal partsas shown. Drawdl, d2, etc., andc 1, c 2, etc.… … pr = pz.psil rz.rk- Zj = ab- --X-- Fia. 133 VII, § 125] CURVED, LINES 137
Geometry, Descriptive
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