ABSTRACT

A ball mill made of pyrex glass with an alumina ball was devised. The features are as follows, 1) quartz and rocks can be powdered manually in a short period of time, 2) pulverization is possible in the pressure range from 10^-3torr to about 3 atm and the temperature up to about 300°C, 3) interior of the mill is visible, and 4) the mill is handy to manipulate and easy to repair. The mill may be useful for varieties of crushing experiments.