Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 714
planes perpendicular to the base of the cube, form-ing thereby a regular octagonal prism. By drawing lines from each of theangles of an octagonal base to the centre point of the upper face of the cube,we have the isometrical representation of an octagonal pyramid. As the lines of construction have… … Fig. 176-^ Fig. 1763. Fig. 1761.
Mechanical drawing
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