A practical course in mechanical drawing for individual study and shop classes, trade and high schools (1912)
Willard, William Franklin, 1879- · Chicago : Popular mechanics company · leaf 42
MECHANICAL DRAWING 39 Exercise 38.—The astronomer tells us that the planeof the earths orbit is called the ecliptic. This is anellipse in shape. Draw an ellipse by two methods. Theupper half to be constructed as follows: AC=4j^inches. DE = 354 inches. DM = AB. M and F arecenters of all arcs on the… … Figr, 37 With A-i as a radius and MF as centers describe arcsintersecting C-i. These are points of the eUipse. Pro-ceed until enough points are determined to locate thecurve. The lower half by the circle method is self-evidentfrom the illustration. Fig. 38. Exercise jp.—Trammel method. Fig. 39,…
Mechanical drawing
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