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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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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