deposits (IMAGE) Johannes Gutenberg Universitaet Mainz Caption Carbonate deposits from the side wall of the elbow-shaped water flume, which have formed on the inside of the wooden flume. The vertical patterns are imprints of saw marks on the wood. Credit photo/©: Cees Passchier Usage Restrictions This image may only be used in connection with the press release "The unique hydraulics in the Barbegal water mills, the world's first industrial plant", issued by Johannes Gutenberg University Mainz on November 13, 2020. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.