Haswell, Charles Haynes, 1809- [from old catalog] · New York, Harper & brothers · leaf 175
de the line A B (Fig.21) into three equal parts at aand fr and on the points A, a, b, and B, with the distanceof two divisions, make four arcs intersecting at c d. Through the points c, tf, and the divisions a, &, drawthe lines cf and d e, and on the points a and b describethe arcs A e and B/,… … • 22.1 Divide the whole or any given por-tion of the circumference into the de-sired number of parts : then, with anyradius less than the distance of two di-visions, describe arcs cutting each oth-er, as Ar,br,cr,dr, etc. ; draw thelines b r, c r, etc., and they will lead tothe centre, as required.…
Engineering · Mechanical engineering
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