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Scientific American 1897-11-13

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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