Haswell's engineers' and mechanics' pocket-book .. (1844)
Haswell, Chas. H. (Charles Haynes), 1809-1907 · New York, Harper & brothers · leaf 58
vide it into two equal parts m O ; take the distance B 0 or O E,and describe a circle. This circle will be equal in quantity to the two given circles FandG. To describe an Ellipse of any given length, without regard to breadth—fig. 9. Let A B be the given length. Rule.—Divide it into three equal… … To describe an Ellipse to any length and breadth given—fig. 10. Let the longest diameter given be the line F, and the shortest G. Rule.—Make A B equal to F, and C D to G, dividing A B equally at right anglesin a. Make A o equal to D C, and dividing o B into three equal parts, set off two ofthose…
Engineering · Mechanical engineering
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