Crang.| Prospecting, Mining and Milling Machinery. 289 
about four inches to ten feet, is treated as will be explained 
later, and that part which does not settle finally escapes at the 
gate, D. 
The canvas sweep, H, is used to settle the finer slimes, 
which tend to float, as they pass over the bottom of the box, A. 
Fig. 68. @Actuating device for Wilfley table and other details of table. 
The round buddle of the convex type is used in this dis- 
trict, and has met with much favor as a finishing machine 
in*the so-called ‘‘sludge’’ mills. The form employed in this 
district is the convex type, no concave forms being employed. 
The square buddle is also employed as a finisher for parts 
of the product of the round buddle. 
The round buddle, in both plan and section, is shown in 
figure 70. It consists of a circular pit lined with short 
pieces of board or plank, so placed that the grain is hori- 
zontal, which are joined together by vertical strips lapping 
over the two ends of the adjacent segments. The pit is about 
twenty-four feet in diameter and eighteen inches deep. 
