"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.