Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 510
ENGINEERING DRAWING. 493 1177) was reduced to 3 inches at their extremities. The weight of these girderswas about 1,000 pounds, and they were proved by a pressure of 9 tons, dis-tributed on the centre panel. … 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
Mechanical drawing
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