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It was probably not until the beginning of the 13th century that technology had advanced sufficiently for the waterwheel to be used as a power source in the production of sawn timber. At first there were mainly cam gates. Then came crank-driven gates in around the 15th century. The change from undershot to overshot waterwheels also at least doubled the output. Finally, at the end of the 16th century, built-in gears increased the speed from 10 to around 80 to 90 per minute. In areas with plenty of water there were also push gates that could reach up to 200 rpm. Of course I would be pleased if you supported me financially. I find a premium membership on YouTube interesting because there are no annoying advertisements. I have one myself so that I can watch all videos without advertisements. I get a portion of the money from the premium membership and also if you watch advertising videos before, between or after my videos. This gives me the time and motivation to produce more videos with restoration techniques, tools, carpentry work and also alternative lifestyles. You can also support me by purchasing high-quality restoration materials on our homepage: https://antik-greef.de/index.php?site... You are of course also welcome to donate via Paypal: Paypal address: [email protected] Alternatively, you can also make a bank transfer: Account holder. Lothar Jansen-Greef IBAN: DE 82520503530130012803 BIC: HELADEF1KAS Many thanks