Inclined plane powered by water wheel in use on a canal. The inclined plane was used to transfer vessels, in this case tub boats, from one level of a canal to another and was an alternative to a lock. The example shown was considered suitable for smaller canals with rise of 20-30 feet (6-9m). From 'A Treatise on the Improvement of Canal Navigation' Robert Fulton, (London 1796). Engraving. Photo via Newscom
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