294 University Geological Survey of Kansas. 
THE ROUND TABLE. 
The principle of this table is practically the same as that 
of the buddle, with the exception that the mineral is removed 
automatically, usually by jets of water, the number of jets 
varying with the number of included minerals in the ore 
treated. Seldom more than two jets are employed; so that 
when more than two minerals occur in combination, two of 
them are removed together, and then this combination is re- 
treated on another table. 
The top and side views of the round table, as it would ap- 
pear in operation, are shown in figure 72. These cuts are 
not intended to show all of the details, but simply to eluci- 
date the general construction and working of the table; shape 
and mounting of the same; the method of feeding, both slime 
and wash water; the distribution of the same on the table; 
and finally the method of removing the mineral from the 
table. A few words of description may serve further to ex- 
plain the working of the table. 
A shaft, D, works in a ball or anti-friction bearing, and is 
supported, in a vertical position, by a bearing above. It sup- 
ports centrally the table, , from which point the table slopes 
in all directions with an inclination of about one to two 
inches in five toeight feet. Supporting timbers extend from 
the framework of the table to a point several feet below the 
junction of the surface of the table with the shaft; they are 
not, however, shown in the accompanying cut, as they would 
tend to confuse the other parts of the drawing. 
The table varies from ten to sixteen feet in diameter and 
stands above the floor from 3% to 4 feet. 
The vertical shaft is driven by gearing which is placed 
overhead, the table turning with the shaft, the speed of ro- 
tation of which is quite slow—one revolution to two or three 
minutes. | 
A circular trough, G, usually made of cast iron, encircles 
the shaft, and is supported independently several inches above 
the table. This trough is divided into two parts by partitions. 
The bottom of the trough is perforated by inch holes, placed 
every two to three inches apart. Water pipes, A, B, and C, 
furnish water either through the trough to the table, or direct 
