Crushing and Grinding.

Size Reduction

“…Pyle and Jones (82) have also studied the effect of wetting agents on the physical properties of clay bodies. Elton (81) views the sedimentation method commonly used for determining particle size as a means of determin-RECENT reports have indicated a growing activity in the application of size reduction (107), in a more definite approach to basic principles (107,108), and in improvements in devices for size reduction (109). This year, all three of these fields have made further advances; and the relatively newer aspects of nucleation and soil conditioning have made their impact.…”

Size Reduction.

“…Among developments in grinding media is the announcement of a cylindrical ball grinding medium of superior hardness and weight. THE report last year (67) indicated that work in this field had been intensified, and this past year has shown maturing results. Practically all the areas which have been discussed in recent years are marked by some progress in technical publications, and some of the more striking of these are summarized here.…”