A machine, invented in the 17th century, worked by a form of reaction wheel. The water flows into a vertical tube and gushes from apertures in hollow horizontal arms, causing the machine to revolve on its axis.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive
This turbine, called Barker's mill, was used in Europe and America.
In 1747, Andreas Segner of the University of G6ttingen described a water turbine similar to Barker's mill, but with six jets instead of two.
James Watt apparently tried to get useful work by running some version of Barker's mill on steam, but without much success.
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