Power Cream Separator
A cream separator is device invented by Martin Wiberg to separate cream from milk (see also Gustaf de Laval). Before milk-cream separators, cream was separated from milk by letting milk sit until the cream floated to the top and could then be skimmed off by hand. The separator was first made by Gustaf de Laval in 1877. With it, it was possible to separate the cream from the milk. When it spins, the milk, which is heaviest, is pushed outward against the walls and the cream, which is lighter, is collected in the middle.
Encyclopaedia Britannica (11th ed., vol. 7) (New York, NY: The Encyclopaedia Britannica Company, 1910)