Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 37
81, a.—A second method. Upon any two points in the cir-cumference nearly opposite, as a and b, {Fig. 39,) describe arcscutting each other at c and d; take any other two points, as eand/, and describe arcs intersecting as at g and h ; join g and h,and c and d ; the intersection, o, is the centre.… … Fig. 4a 81, b.—A third method. Draw any chord, as a 6, {Fig. 40,) PRACTICAL GEOMETRY. 23 and from the point, a, draw a c, at right angles to a b ; join c and b ; bisect c 6 at d—which will be the centre of the circle. If a circle be not too large for the purpose, its centre may veryreadily be…
Carpentry · Architecture
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