Talk:Tumble polishing

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here is a good source of more information on this topic http://geology.com/rock-tumbler/

Removed the following section because it is too specific to some very particlar arrangements and the formulation wasn't cited well enough for the limitations to be clear. The barrel ... "rotates — if round — at about $\frac{132.8} {\sqrt{D_{in}}}$ (where Din is the inside barrel diameter in inches) RPM. A hexagonal barrel will rotate at about $\frac{79.7} {\sqrt{D_{in}}}$ RPM ^[1]."