Abstract
An instrument is described which works as a centripetal vacuum pump. It consists of two circular metal plates, one stationary, the other rotating opposite it. The stator has an opening in the centre. The rotor can be freely displaced along the axis of rotation. By centripetal pumping action it is kept floating on an air cushion of thickness
D
. The relation between
D
and the speed of rotation was determined for different weights of the rotor to be supported. The results are interpreted on the basis of Maxwell’s theory of the elastico-viscosity of air.
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