An air-driven ultracentrifuge is described in which the air turbine is below rather than above the large rotor or centrifuge. The centrifuge is mounted inside a vacuum tight chamber on a flexible shaft which extends vertically downward, through an oil gland that seals the vacuum chamber, to the turbine below the chamber. The rotating parts are supported upon an air cushion below the turbine. The turbine is driven by air jets. The rotation of the centrifuge is very smooth and the maximum speed is limited only by the strength of the centrifuge.
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Beams et al. (1937) studied this question.