Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 537
est material, the outer voussoirsbeing cut stone. In the rules above given no consideration is paid to the strength of thecement in which the stones are bedded. When the cement is thoroughly set,the structure is in a measure monolithic, and the thrust is inconsiderable. Fig. 1244 is the elevation…
Mechanical drawing
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