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Holweck pump
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Holweck pump : ウィキペディア英語版
Holweck pump
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 10−8 mmHg.
==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.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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