. KRTJPP GRUSONWERK, M AGDEBURG-BUCKAU, GERMANY. 3. — Grinding between mill stones ately soft material, like matte, the can probably claim higher antiquity author has found hard stones, like old than any other method. The primitive Belgian paving blocks, to be much housewife who was also the… … in structural material of mills with two or more revolving disks, or with a cone revolv- ing in a rigid cup either ver- 1 " A '^ tical or horizontal, like our coffee mills, still fill an im- portant place among the mul- titude of grinding contriv- ances which are now in use. THE INTERIOR OF A…
Engineering
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