ScientificAmerican1902-05-31.jpg Scientific American 1902-05-24ThumbnailsScientific American 1902-06-07Scientific American 1902-05-24ThumbnailsScientific American 1902-06-07Scientific American 1902-05-24ThumbnailsScientific American 1902-06-07Scientific American 1902-05-24ThumbnailsScientific American 1902-06-07Scientific American 1902-05-24ThumbnailsScientific American 1902-06-07

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