A water brake is a type of fluid coupling used to absorb mechanical energy and usually consists of a turbine or propeller mounted in an enclosure filled with water. As the turbine or propeller turns, mechanical energy is transferred to the water due to turbulence and friction. The shock caused by the acceleration of the water as it passes from poc...
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http://en.wikipedia.org/wiki/Water_brake
(from the article `dynamometer`) ...mechanical friction on the periphery of a rotating pulley by means of brake blocks that are squeezed against the wheel by tightening the bolts ...
Found on
http://www.britannica.com/eb/a-z/w/13
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