Johnston, Philip Devereux, 1855- · New York, D. Williams Company · leaf 70
the compass, will meet all requirements. Fourmethods are given on Plate 14. Fig. 20.—The Oval. Draw centre lines A B and C D. With their inter-section O as centre describe a circle whose diameter isequal to the large end of the oval. From D draw D Eand produce to F, likewise from C draw C E and… … D r>& 20. 66 A MANUAL OF MECHANICAL DRAWING. Plate 14. Approximate Ellipses. To drazv an approximate ellipse with compass^ themajor axis only being given: First Method. Fig. i. Draw A B equal to given length, divide into fourequal parts A C, C D, D E and E B. With C and Efor centres and…
Mechanical drawing
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