re great care is exercised in the various escaping into the room, while it admits of viewing the ; manipulations, are rarely exact or trustworthy. The ordi- plate as it liés in the bath. nary wet methods of analysis are rather complicated, slow, The invention will be readily understood by reference… … boils and is rapidly concentrated to any degree 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…
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