THE SCIENTIFIC AMERICAN. 135 . 30 or 40 furnaces are in operation. The zinc ore yields 40 per cent of metal. This being subjected to an in perfect material for paint., 1860-08-25
THE SCIENTIFIC AMERICAN. 135 . 30 or 40 furnaces are in operation. The zinc ore yields 40 per cent of metal. This being subjected to an in perfect material for paint., 1860-08-25
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