Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 535
n-r-n-i i 1 Fig. 1239. 518 ENGINEERING DRAWING. This is intended not only to turn aside drift, but as an ice-breaker; the ice,moving up the incline, is broken by its own weight. Fig. 1240 is a section of the foundation of the Bismarck bridge, showingthe construction of the inverted caisson, similar… … Fig. 1240. Bridge piers. The caissons are 74 long, 26 wide, and 17 high outside; theworking-chamber 7 feet high. The caissons are built of pine, sheathed withtwo thicknesses of 3 oak-plank. Above is crib-work filled in with Portlandcement concrete; a a are the air-locks. The sand was removed from…
Mechanical drawing
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