236 University Geological Survey of Kansas. 
by boarding up the framework inside, thus forming a box 
which is filled with broken rock. 
It is very essential that the crusher is held firm and not 
allowed to shake or vibrate in the least. Power will be lost 
and the building weakened ; besides a disagreeable noise will 
result if any such movement is allowed. 
ROLL FRAMKS. 
Roll frames are built of 8x9, 10x10 or 10x12 inch pine 
timbers, and are constructed by putting together two rec- 
tangular frames in such a manner that. a rectangular paral- 
lelopiped is formed. The timbers are all mortised and the 
whole firmly bolted together by three-fourths inch bolts. 
Details of the construction of such a frame are shown in 
figure 35. 
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Fig, 35. Foundation frame for rolls. 
The length of the frame is usually seven feet, while the 
breadth is three and one-half to four feet. The vertical di- 
mensions depend upon the construction of the mill, and may 
be of any height up to 43 or 5 feet. 
When the roll frame or foundation is high, a trough is pro- 
vided to catch the crushed material which falls from the rolls 
above; when low, a rectangular-shaped funnel, formed of 
boards, is employed. 
The frame is anchored down by dead men placed several 
feet below the surface in a bed of broken rock or concrete. 
