Here is the webpage for Jim Grigg's Hydrosonic pump units that heat
water, oil, or other fluids by two counterrotating drums, thanks Al!
---Al Sherman wrote:
>
> I recall tht there was a posting about using two tin cans to create
> a working model posted on Keely some time ago, also this URL is
> a commercial unit;
>
> http://www.hydrodynamics.com/
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