Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 712
Fig. 1757. Fig. 1759. 696 ISOMETRICAL DRAWING. before appeared to be the top of the object will now appear to be its underside. The angle of the cube formed by the three radii meeting in the centre ofthe hexagon may be made to appear either an internal or external angle, inthe one case the faces…
Mechanical drawing
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