Haswell's engineers' and mechanics' pocket-book .. (1844)
Haswell, Chas. H. (Charles Haynes), 1809-1907 · New York, Harper & brothers · leaf 59
meter be A, and the shortest B. Rule.—Draw the Ime C D equal in length to A ; also E F equal in length to B,and at right angles with 0 D. Take the distance C O or O D, and with it, from the point E and F, describe thearcs h arid/upon the diameter C D. Strike in a nail or pin at h and at/, and put a… … To find the Centre and two diameters of an Ellipse—fig. 12. Let A B C D be the ellipse. Rule.—Draw at pleasure two lines, Q G, M O, parallel to each other ; bisect themin the points H N, and draw the line P E ; bisect it in K, and upon K, as a centre,describe a circle at pleasure, as F L R,…
Engineering · Mechanical engineering
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