[Rockhounds] Elutriation

[jb]

Kreigh Tomaszewski wrote:
> Pete,
>
> I first ran across Elutriation in "Separation of Abrasives on a 
> Laboratory Scale" by G. Dallas Hanna included in "Amateur Telescope 
> Making (Book Three)", starting on page 269, published by Scientific 
> American, Albert G. Ingalls, Editor.
>
> BTW, I highly recommend the three volume set to any lapidary. 
> Astronomers polish surfaces to tolerances under a wavelength of light 
> and can teach us amateurs a lot.
>
> A footnote in the paper refers to "Short-column Hydraulic Elutriator 
> for Subsieve Sizes" by S. R. B. Cooke, U.S. Bur. Mines Report of 
> Investigation No. 3333, Ore Dressing Studies, pp 37-51, figs. 5-19, 
> Feb 1937. It noted the paper was in mimeograph format, reported 
> efficiency of nearly 100% with simple construction, and included 
> extensive references to previous literature.
>
> If you can find the paper I sure would love to get a copy. At least 
> you now know what you are looking for.
>
> Cheers!
>
> Kreigh
>
>
Google the title "Short-column Hydraulic Elutriator" and you will find 
lots of material, including a free pdf copy of the original paper.



john