An engraving depicting a weir with a movable bridge. This movable dam acted as a flash-lock. When a boat reached the weir from upstream, the paddles removed and the boat was carried over a shallow on the temporary depth supplied by the water that was released. Dated 19th century
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Image Number: 1746-29972753Rights ManagedCredit Line:World History Archive/Image Asset Management/SuperStockCollection:Image Asset Management Contributor:World History Archive Model Release:NoProperty Release:NoResolution:5820×3603
