Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 37
{Fig. 38,) and bisect it with the perpendicular, c d ; bisect c dwith the Hne, ef, 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 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.…
Carpentry · Architecture
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
