Gravity Cream Separation Physics

Why cream rises on milk left to stand, told through Stokes' law, globule size, the thickening of cold milk and the clumping of globules by milk's own antibodies, which it credits for the speed of cold setting. It follows the shallow pans and iced cans of the nineteenth century and sets gravity against the centrifuge in a table, reckoning that 12 to 48 hours of setting leaves 0.10 to 0.50 per cent fat in the skim. Many equations and globule sizes dropped out.