Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 445
Fig. 1021. Fig. 1022. excavating and pumping for the foundations of bridges, but by substitution ofbucket-dredges to remove the inner cores of earth greater facility in work anddepth of sinking has been secured. This system has been successfully appliedto the sinking of iron caissons. In the…
Mechanical drawing
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