Atmospheric dust
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Article
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1922
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Wiley (John Wiley & Sons)
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## REV1 matcrial, thc extent of clisintegrat,ion, and thc rato of rcvolution of tho mill. It is statcd that tlircc ls-litrc machines in series, rullnillg at 0000 r.p.in., can grind 1000 lcg. ground " raw phosphate," or 200 kg. ccllulosc in an hour to such n stnte of clivision that 85 per cent. of