Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 574
e are building acts in force defining thekinds of material and thickness of walls and foundations, towhich all constructions within their limits must conform. Openings in masonry-walls are covered by lintels or arches,or both. It is usual to place a stone or cast-iron lintel in theexterior face… … Fig. 1324.
Mechanical drawing
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