ScientificAmerican1908-10-03.jpg Scientific American 1908-09-26ThumbnailsScientific American 1908-10-10Scientific American 1908-09-26ThumbnailsScientific American 1908-10-10Scientific American 1908-09-26ThumbnailsScientific American 1908-10-10Scientific American 1908-09-26ThumbnailsScientific American 1908-10-10Scientific American 1908-09-26ThumbnailsScientific American 1908-10-10

Construction of the New York State Barge Canal. One of the powerful hydraulic dredges in operation. Laying the concrete floor of Lock No. 2 at Waterford.



Source: Steve Kirch, creator of a wonderful website about SCIENTIFIC AMERICAN in the past

Restoration by: magscanner