CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



251 



586& 



IM*. 



Ko. 5868. 



5870. 



Nos. 5869-70. 



FLOTATION MACHINE, Brauu (patented). A miniature machine suitable for laboratory tests, 

 built similar to the standard size, producing every effect essential to determine to what extent 

 an ore 'will lend itself to flotation. The machine is constructed of heavy cast iron, the interior 

 consisting of a hollow cylinder which is coated with a special hard baked enamel, a wooden 

 drum provided with a series of longitudinal air slots, and a larger number of longitudinal 

 riffles running the entire length of the drum. An iron strip perforated with small holes placed 

 tangentially to the periphery of the drum admits the pulp into the frothing box. The machine 

 is split in the center, the top being hinged, which permits ready access to every working part 

 and facilitates cleaning. When closed the top is held in place by thumb bolts, rubber gaskets 

 insuring a tight joint. For taking samples of tailings a small hole is provided in the bottom 

 of the frothing box, which is closed by means of a stopper. Capacity, from one to two pounds 

 of drv product; shipping weight, 185 pounds; dimensions 27x21x12 inches; with tight and loose 

 pulleys, 6x2 inches; speed recommended, 400 r. p. m. Complete with directions for use.. fifcOP 



FEEDER FOR OILS, Braun Mechanical Disk, for nse with Xo. 5868. The problem of successful 

 flotation depends to a great extent upon the regularity of the flow of reagents. The Braun 

 Mechanical Disk Feeder eliminates detrimental results due to irregularity in feeding reagents. 

 A disk of iron is mounted on a shaft and revolved within an iron tank. A thin film of oil ad- 

 heres to the finished surface of the disk as it revolves through the oil. A portion of this film 

 is transferred to the trough through which it flows into the flotation machine. The feed is 

 regulated by adjusting the position of the trough by means of two micrometer screws. Grit, 

 sludge, or any foreign matter cannot choke it. Fitted with tight and loose pulleys. Shipping 

 weight, 120 pounds; length, 23 inches; width, 16 inches; height, 15 inches. Complete with 

 directions for nse 54.00 



FEEDER FOR ACIDS, Braun Mechanical Disk, for use with Xo. 5868, of same construction and 

 dimensions as Xo. 5869, but with disk of lead, lead lined tank, and trough of bronze to resist 

 action of acids. Shipping weight, 160 pounds 80.00 



