American Stair-Builders' Guide

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. Make A B (figure 1) the long diameter or major axis, and C D half the short diameter or minor axis of the required ellipse. From the point D as centre, with C B as radius, describe arcs, cutting the major axis at 2 ...