Let's Talk Rusty Iron: Early separators were a boon to farm and dairy.
As raw milk is poured into the supply can, the electric-driven separator goes to work. Skim milk pours into the large milk can and cream discharges into the bucket.
Chart touting the advantages of a cream separator.
This drawing shows how milk runs into the bowl from the top center. As the discs spin, centrifugal force moves the denser skim milk to the outside and discharges it through the skim milk outlet. The less dense cream is guided by the cone-shaped intermediate discs up and out the cream outlet.
A Royal Blue ball bearing cream separator as advertised in the 1930-1931 Montgomery Ward & Co. catalog.
Cutaway view of the separating bowl of a typical cream separator. The shaft in the bottom center of the bowl spins the cream disc and the intermediate discs.