Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 510
Fig. 1170. A second series of girders were made of similar form, but of increased di-mensions in the section of their parts. Their weight averaged about 1,350 … ///////////A>^ Fig.1181. pounds, and were proved to 15 tons. A third series weighed about 2,000pounds, and were proved to 22^ tons. Figs. 1182 and 1183 are sections and details of the trusses for su&taining theroof and floor of the English High and Latin School Gymnasium,…
Mechanical drawing
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