Wallis, Rolland S. [from old catalog], Iowa state college of agriculture and mechanic arts, Ames. Dept. of engineering extension. [from old catalog] · Ames, Iowa, Engineering extension department, Iowa state college · leaf 67
d in the manner indicated (Fig. 87a) and a suffic-ient number of points to define the curve located by intersecting arcsstruck from the foci as centers. The trammel method (Fig. 87b) is aneater one for the draftsman as it requires no construction lines. On astraight slip of paper three points (E, F… … Minor Axis Major Axis _ Mpijor_ Axjs_ Long Diameter
Mechanical drawing
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