ScientificAmerican1897-11-13.jpg Scientific American 1897-10-23ThumbnailsScientific American 1897-10-23ThumbnailsScientific American 1897-10-23ThumbnailsScientific American 1897-10-23ThumbnailsScientific American 1897-10-23Thumbnails
The manufacture of steel tubing -- Bessemer converters as the National Tube Works, McKeesport, Pennsylvania. First few minutes of the blow. The "Fining" stage. Casting the ingots. The "Boil" of eight minutes duration.



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

Restoration by: magscanner