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Perpendicular Canal Lift. The weight of the tub boats was counterbalanced by a tub of water in shaft (right). A semaphore signal indicated the status of the boats. Not found practicable. From 'A Treatise on the Improvement of Canal Navigation' by Robert Fulton (London, 1796). Robert Fulton (1765-1815) American engineer. Engraving. Photo via Newscom

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