Bryan J. Maloney wrote:

"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.

We had an old DeLaval separator for our Guernsey milk when I was a
child. Amazing yellow milk that coated the mouth most silkily. It was
my job to crank the separator on the production of the half-dozen cows
we had.

But I'm sure I never saw my grandfather put grass in either end of the
cows.

Pastorio