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Scientific American, Vol. 45, No. 7 (1881) (1881)
leaf 4
desired. The vacuum pan employed is a close vessel of copper, egg- Correspondents who have asked how to test copper ores shaped, about six feet high and four and one-half feet in will find the following method simple, expeditious, and diameter. It is heated by steam coils within, and by a steam… … are no longer given off. Then one ounce of cold water is far smaller proportion of ash and of phosphoric acid, and stirred in, and after a few minutes’ standing two ounces of by higher proportion of carbon, nitrogen, and sulphur. © 1881 SCIENTIFIC AMERICIAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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