Archimedean Screws
by Science Photo Library
Title
Archimedean Screws
Artist
Science Photo Library
Medium
Photograph - Photograph
Description
Archimedean Screws for raising water from one level to another. The 'thread' could be either external (as in Fig. 3), or the more conventional internal spiral in Fig. 2. From Ferguson's Lectures edited David Brewster, Edinburgh, 1805
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July 7th, 2016
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