Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 692
Fig. 1658. Fig. 1660. Examples of window tracery, showing its constructive centres and lines, aregiven on pages 81 and 82, illustrating the chief varieties. The following figuresare more complete in positionand with architraves, Geomet-
Mechanical drawing
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