CC STUDIO / SCIENCE PHOTO LIBRARY CC STUDIO / SCIENCE PHOTO LIBRARY
Historical centrifuge for separating out substances of different densities. Mixtures of liquids or solids were placed in two tubes that fitted into the two rings on the rotor-like part at upper left. Turning the handle would cause the rotor to spin rapidly, swinging the ends of the tubes outwards. The densest material would be forced to the bottom of the tube by the spin.
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