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Bessler and his machine then vanished into obscurity. It is known that he was rebuilding his machine in 1727 and that 's Gravesande had agreed to examine it again, but it is not known whether it was ever tested. Bessler was apparently arrested in 1733, but by 1738 he was again free and living in an estate in Bad Karlshafen, near Kassel. Bessler died in 1745, aged sixty-five, when he fell to his death from a four-and-a-half-story windmill he was constructing in Fürstenburg.