ScientificAmerican1897-10-23.jpg Scientific American 1893-03-11ThumbnailsScientific American 1897-11-06Scientific American 1893-03-11ThumbnailsScientific American 1897-11-06Scientific American 1893-03-11ThumbnailsScientific American 1897-11-06Scientific American 1893-03-11ThumbnailsScientific American 1897-11-06Scientific American 1893-03-11ThumbnailsScientific American 1897-11-06
The manufacture of steel tubing -- blast furnaces of the National Tube Works company, McKeesport, Pennsylvania.



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

Restoration by: magscanner