Crawshaw, Fred D. (Fred Duane), b. 1874, Phillips, J. D. (James David), 1869- joint author · Chicago, New York, Scott, Foresman and company · leaf 52
Representing a One-Inch Circle. 1. Draw light indefinite lines at right angles to each other torepresent the axes of the ellipse. B T A 0 ^3 . J Fig. 40. Testing an Ellipse 2. On the line representing the major axis lay off on eitherside of the intersection of the axes one-half the diameter of… … Fig. 41. Concentric Circles in Perspective ellipse and then the ends. Compare the form thus secured withthe corresponding ellipse in the scale of levels. Care should betaken to avoid sharp or blunt ends. 5. Ordinary defects in the form of the ellipse should be de-tected by examining it as follows:…
Mechanical drawing
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