Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 76
68). Extend the sides of these octagonsacross the other squares, and similar corners will be cutoff, and the octagons and squares required will be com-plete. With the aid of paper thuscovered with squares, triangles,or lozenges, various geometricaldesigns may be readily con-structed, pleasing in… … Fig. 159.
Mechanical drawing
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