| 翻訳と辞書 | Holweck pump| Holweck pump  : ウィキペディア英語版 | 
 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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