268 University Geological Survey of Kansas. 
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Fig, 50. Form of rolls in common use and made by local foundries. 
parts of the rolls. The bearings for the roll shafts are set 
upon these base castings, and upon the bearings, supported 
at either end, is placed another casting or top piece, F, 
which holds them together and provides a support for the 
hopper, H. Between these castings, F and G, is fastened a 
block of iron, J, provided with an opening through which 
the hand bolt, K, extends. A thin casting, 3, figure 52, 
grooved at the top and bottom, slides between the two cast- 
