ScientificAmerican1899-10-21.jpg Scientific American 1899-10-14ThumbnailsScientific American 1899-10-28Scientific American 1899-10-14ThumbnailsScientific American 1899-10-28Scientific American 1899-10-14ThumbnailsScientific American 1899-10-28Scientific American 1899-10-14ThumbnailsScientific American 1899-10-28Scientific American 1899-10-14ThumbnailsScientific American 1899-10-28

The new Philadelphia subway and tunnel. 40-inch water pipes. Reconstruction of part of the Baldwin Locomotive Shops. View in tunnel.



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

Restoration by: magscanner