A Holweck pump is a type of vacuum pump that utilises the drag of air molecules against a rotating surface. The modern turbomolecular pump is a more advanced version based on similar operation, and a Holweck pump is often used as the backing pump for it. The Holweck pump can produce a vacuum as low as 1×10−8 mmHg (1.3×10−6 Pa).
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Invention
The device was invented in the early 1920s by Fernand Holweck as part of his apparatus for his work in studying soft X-rays.
Manufacture
It was manufactured by French scientific instrument maker, Charles Beaudouin.
References
Holweck pump Wikipedia(Text) CC BY-SA