Haswell's engineers' and mechanics' pocket-book .. (1844)
Haswell, Chas. H. (Charles Haynes), 1809-1907 · New York, Harper & brothers · leaf 57
Triangles and Squares. 0 … To make an Equilateral Triangle equal to two gioen Equilateral Triangles—fig. 6. Let the given equilateral triangles be A and B. Rule.—Draw a right line C D equal in length to one side of the triangle B.Erect the perpendicular D E, equal in length to one side of the triangle A. Draw C E, and…
Engineering · Mechanical engineering
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