"Opinicus" > nattered on
:

> Bob Pastorio > said:
>
>> What a cool idea. Grass in, cream out. What will they think of next?
>
> Well actually it's "Grass in, Milk out". Then you have to separate the
> cream.
>
> How DO they separate the cream?
>

A centrifuge is used, and this method has been used for quite a long time.
When I was a kid I saw an old-timer demonstrating foot-treadle-powered
rotary skimmer.