ScientificAmerican1882-02-04.jpg ThumbnailsScientific American 1893-02-25ThumbnailsScientific American 1893-02-25ThumbnailsScientific American 1893-02-25ThumbnailsScientific American 1893-02-25ThumbnailsScientific American 1893-02-25
Progress of the Hudson River Tunnel -- the New York caisson



Source: Steve Kirch, collector, and creator of a great website about SCIENTIFIC AMERICAN in the past

Restoration by: magscanner