Archimedean Screws for raising water from one

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

1805 Archimedean Brewster Conventional Ediburgh Edited Either Internal Irrigation Lectures Level Powe Raising Screws Spiral Thread

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