Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 36
Fig. 68. bisect the external angles at A and B by the lines A H, B 0, each equal toA B; draw 0 D and H G parallel to A E and equal to A B; and from thecenters G, D, with a radius equal to A B, cut theperpendiculars at E, F, and draw E F to completethe octagon. To make a regular octagon from a…
Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
