Publisher's Synopsis
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 G'r draw a line through C, cutting the tangent at D, then B E is the required length.
Fig. 2, another method. A B C is a semicircle; A C the diameter, with the distance A C as a radius; describe two arcs, cutting each other at G, draw the tangent D E through B, extended parallel to A C, the diameter; draw the lines G D and G E through the points A and C, and from the equilateral triangle D E G, any side of which is equal to the semicircle A B C.
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