Appletons' cyclopædia of technical drawing : embracing the principles of construction as applied to practical design ... (1896)
Worthen, W. E. (William Ezra), 1819-1897 · New York : D. Appleton · leaf 36
m I FIG. 68. … E.- -—-F bisect the external angles at A and B by the lines A H, B C, each equal toA B; draw C 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
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