Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 55
with all its divisions, as at 1, 2, 3, &c.; from a, draw a c, at any angle with a b ; make a c equal to A ; join c and b ; from the points, 1, 2, 3, (fee, draw lines, parallel to c b ; then tftese will divide the line, a c, in the same proportion as B is divided—as was required. This problem… … Fig. 78. 110.—Between two given right lines, to find a mean pro-portional. Let A and B, {Fig. 78,) be the given lines. Onthe line, a c, make a b equal to A, and b c equal to B ; bisect ac in e ; upon e, with e a for radius, describe the semi-circle, a d PRACTICAL GEOMETRY. 41 c; at h, erect h d, at…
Carpentry · Architecture
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