Denis
The third edition of
Textbook of Ore Dressing by Richards and Locke, McGraw-Hill, New York and
London, 1940
describes a number of pnuematic machines and has some discussion of their
merits. The earlier editions of this classic (1909, 1925) might also have
information on earlier devices but are probably unobtainable.
Peter Hutchison
Hon. Gen. Secretary
The Historical Metallurgy Society Ltd
Email [log in to unmask]
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Tel +44 (0) 1792 233223
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