92 [AsSEMBLt 



All the matter to be ground is received through the opening of 

 the fly wheel, and follows the direction of the arrows to the amal- 

 gamator or other receivers. 



This is a very recent invention of great simplicity, and more effec- 

 tive than any method heretofore in use for the purpose of crushing 

 hard substances. It is the invention of Mr. John W. Cochran, of 

 New-York city. 



The machine consists of two saucer-shaped cast iron basins, one 

 of which is permanently fixed upon a solid foundation, and fur- 

 nished with six cast iron balls, each nearly or quite touching its 

 neighbor. The other saucer is inverted and placed upon the top 

 of the balls ; the outer surface of the inverted basin is constructed 

 for carrying a driving band, balance wheel and feeding trough, 

 through which the material to be crushed is conveyed to the in- 

 terior of the machine. 



The upper saucer may be made to revolve at any desired speed, 

 carrying ihe balls around. It should be mentioned that three of 

 the balls are larger than the others, and placed in the lower basin 

 alternately. The revolution of the upper basin gives a forward 

 axial motion to the larger balls, whilst the motion of the smaller 

 ones is reversed by contact with the larger. The granulated ma- 

 terial passes from the peripheries of the balls, through a sieve or 

 grating, and is deposited in a trough outside the basin, and thence 

 descends to the opening below. 



It would seem that there is little liability in this machine to 

 get out of order ; it presents the appearance of great durability 

 and cheapness in construction, and the granulation of the material, 

 particularly gold bearing quartz, is deemed far preferable to pul- 

 verizing with stampers, because, by the latter process, a quantity 

 of the metal is liable to be carried off in leafy particles, coated 

 with iron pyrites. 



The machine is adapted to pulverising gold, iron, zinc, copper 

 and lead ores, plaster, flint, coal, pumice, bones, drugs and dye 

 stuffs, copper and iron cinders, marble, cinnabar, barytes, in short 

 every minnral substance, wet or dry, as may be required. At 

 Com. Stockton's mine in Fluvana county, Virginia, it is certified 



