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, Ediburgh, 1805
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Image Number: 1746-19627216Rights ManagedCredit Line:World History Archive/Image Asset Management/SuperStockCollection:Image Asset Management Contributor:World History Archive Model Release:NoProperty Release:NoResolution:4500×3587
