Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 78
Fig. 168. Fig. 169. … Fig. 170. all of which curved lines and the top of the trefoil are made. A series ofarcs may be added at the pleasure of the designer. In the two pieces ofmoulding (Figs. 170 and 171) the trefoil is inserted vertically to the sides inone and horizontally in the other. In the latter, a half of the…
Mechanical drawing
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