A couple of nice impeller machining images I identified:
Image from web page 297 of “The flotation approach” (1916)
Image by Net Archive Book Pictures
Identifier: flotationprocess00richuoft
Title: The flotation method
Year: 1916 (1910s)
Authors: Richard, Thomas Arthur, 1864-
Subjects: Flotation
Publisher: San Francisco Mining and Scientific Press
Contributing Library: Gerstein – University of Toronto
Digitizing Sponsor: University of Toronto
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Text Appearing Just before Image:
Fig. 63. the hoover jiachixe. above, leaves the leading of the machine free for the operator and ismore practical in each way. This is of value in a laboratory-machine, and will excuse the use of a stuffing-box. In huge-scalemachines a stuffing-box underneath would not be tolerated, and the TESTING ORES FOR THE FLOTATION Method 289 drive ought to be from above. We would also suggest a sheet-leadconstruction as getting a lot more easily built. A ^-inch sheet-lead issuflSciently rigid to stand up nicely, whilst it is ductile adequate to be
Text Appearing After Image:
Fig. 64. the hoover machine, displaying stirrer. A. Spitzkasten. B. Agitation compartment. C. Variable-speed motor. D. Retaining bolts. E. Impeller. F. Concentrate discharge. 290 THE FLOTATION Procedure worked readily into the preferred shape. The joints are effortlessly burned,and it is acid-proof. The Hoover Machine^ so-called, was designed right after a test-machine described in the second edition of Hoovers book, beingcopied from one particular of Lysters patents, and has been significantly copied bypeople wishing to make flotation tests. An improvement over thisconstruction was published by Ralph Smith* not too long ago (see Fig. 61),and a modified sketch of the identical is shown in Fig. 62, whilephotographs of the machine utilised for a although 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 building hasbeen well-known simply because it can be made of wood, at modest expense.The Janney machi
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