Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 25
Fig. J8. … To find the centre of a given circle^ or of an arc of a circle. Of a circle (Fig. 19).—Draw the chord A B. Bisect it by the perpen-dicular 0 D, whose extremities lie in the circumference, and bisect CD. Gr,the point of bisection, will be the centre of the circle. To find the centre of an arc (Fig.…
Mechanical drawing
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