CRANE.| Prospecting, Mining and Milling Machinery. 235 
level with the same. Neither the crusher frame nor any part 
of the crusher support can be fastened to the floor timbers of 
the crusher room or, in fact, to any part of the mill building, 
due to the excessive vibratory motion set up and maintained 
by the crusher while at work. 
CRANE 
Fig. 34. Foundation frame and support for crusher. 
The framework or foundation of the crusher is built up 
from the ground next to the jig room side of the crusher room, 
and is anchored down by dead men, placed from 6 to 8 feet 
below the surface. It is also placed upon a bed of broken 
rock, and occasionally upon concrete. 
The timbers are 8x9, 10x10 or 10x12 inch material, and 
are bolted and braced in the strongest possible way. A bat- 
ter of from two to two and one-half inches to the foot is given 
to the vertical support in both directions. Figure 34 shows 
a side view of a crusher frame with a portion of a frame for 
rolls attached, showing how connection is made when this 
arrangement is desired. 
When the floor of the crusher room is quite high, extra 
precautions are taken in anchoring down the crusher founda- 
tion. In such cases it is also ballasted, which is accomplished 
16—viii 
