3/4

Sinking the Brooklyn caisson for East River Bridge No. 3. Layers of sand, hardpan, silt and the river shown.
Source: Steve Kirch, collector, and creator of a great website about SCIENTIFIC AMERICAN in the past
Restoration by: magscanner
- Created on
- Monday 22 March 2010
- Posted on
- Monday 22 March 2010
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- 1783