The American house-carpenter; a treatise on the art of building, and the strength of materials (1867)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York, J. Wiley · leaf 35
(Fig. 38,) and bisect it Avith the perpendicular, c d ; tisect c Uwith the line, e/, as at g ; then g is the centre as was required. … 81, a.—A second method. Upon any two points in the cir-cumference nearly opposite, as a and h, (Fig. 39,) describe arcscutting each other at c and d: take any other two ]^oints, as eand/, and describe arcs intersecting as at g and h ; join g and A,and c and d ; the intersection, o, is the centre.…
Carpentry · Architecture
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