You missed a lot of "object lessons" that only farm kids get to understand!~
Well anyway, one of my jobs was to wash the cream separator every day. So I got to know that centrifuge intimately. It really was a marvelous little contraption. You let fresh cow's milk run into the top of the machine ....... it ran down into the center of this WHIZZING centrifuge (running at maybe half the speed of a router) but which the operator was making to spin by turning a crank ........... and in a couple of moments the centrifuge was full of milk and spewing out cream from the top outlet hole and skimmed milk from the lower, larger hole.
Here's one pictured (much like ours in the top photo, with a crank on the right side of it. The lower picture shows the machine more completely -on the left side of the drawing- but we didn't have any steam engine hooked up to ours!~ )
-Vince