John Thomas
Geometrical Stair Builder, Simplified (Classic Reprint)
Excerpt from Geometrical Stair Builder, Simplified Fig. 1 is a quadrant; to find the stretch out B C the quadrant, F C the diameter, with the distance F C in the compass, describe two arcs, cutting each other at G, and draw the tangent B E parallel to F C, cutting the quadrant at B; from the point ...
$36.64