How to operate a cream separator

Source:  Mutations of Mortality

From L.M. Kilmister.  Farm and Home Mechanics' Guide.  Regina, Sask:  
Farm Mechanics Publishing Co., 1943.

See my earlier post on the DeLaval separator.  In Dr. Terry Hamblin's blog, Mutations of Mortality, he adds that this machine was adapted to become the first blood cell separator.  Very cool!