Reaction-wheel
(Mech.), a water-wheel driven by the reaction of water, which, entering it centrally, escapes at its periphery in a direction opposite to that of its motion by orifices at right angles to its radii.
(Mech.), a water-wheel driven by the reaction of water, which, entering it centrally, escapes at its periphery in a direction opposite to that of its motion by orifices at right angles to its radii.