Cotto n cut in a Wiley mill to pass a 20-mesh scr ee n was ground in a vibrator y ball mill similar to one t hat has been used in German y and H olland. Con tamination of the cotton was practically elimin ated by using a chromium-plated hardened steel jar and chl'omium all oy balls. The jar holder is held by a slip rin g instead of being bolted in place. The jar and holder automatically rotate slowly on t h eir axis, and t his motion co unteracts t he ten dency of t he cotton in t he jar to settle and grind nonuniforml}'. The jar is cooled by blowing air over it and becomes bare ly warm to t he to uch.
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Forziati et al. (1950) studied this question.
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