The flotation process . Fig. 63. the hoover jiachixe. above, leaves the top of the machine free for the operator and ismore convenient in every way. This is of importance in a laboratory-machine, and will excuse the use of a stuffing-box. In large-scalemachines a stuffing-box underneath would not be tolerated, and the TESTING ORES FOR THE FLOTATION PROCESS 289 drive should be from above. We would also suggest a sheet-leadconstruction as being more easily built. A ^-inch sheet-lead issuflSciently rigid to stand up well, while it is ductile enough to be. Fig. 64. the hoover machine, showing stir
The flotation process . Fig. 63. the hoover jiachixe. above, leaves the top of the machine free for the operator and ismore convenient in every way. This is of importance in a laboratory-machine, and will excuse the use of a stuffing-box. In large-scalemachines a stuffing-box underneath would not be tolerated, and the TESTING ORES FOR THE FLOTATION PROCESS 289 drive should be from above. We would also suggest a sheet-leadconstruction as being more easily built. A ^-inch sheet-lead issuflSciently rigid to stand up well, while it is ductile enough to be. Fig. 64. the hoover machine, showing stirrer. A. Spitzkasten. B. Agitation compartment. C. Variable-speed motor. D. Retaining bolts. E. Impeller. F. Concentrate discharge. 290 THE FLOTATION PROCESS worked readily into the desired shape. The joints are easily burned,and it is acid-proof. The Hoover Machine^ so-called, was designed after a test-machine described in the second edition of Hoovers book, beingcopied from one of Lysters patents, and has been much copied bypeople wishing to make flotation tests. An improvement over thisconstruction was published by Ralph Smith* recently (see Fig. 61),and a modified sketch of the same is shown in Fig. 62, whilephotographs of the machine used for a while in our laboratory areshown in Fig. 63 and 64. Either a variable-speed motor is belted tothe pulley that drives the stirring mechanism, or a pair of cone-pulleys on a constant-speed motor is used. This construction hasbeen popular because it can be made of wood, at small Janney machi
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Keywords: ., bookcentury1900, bookdecade1910, bookidflotationpro, bookyear1916
