Abstract: A hydrotherapy apparatus incorporating a water wheel coupled to a reduction gear assembly for providing a strong jet of water at an extremely uniform rate of rotation, even at slow rotational speeds. The water wheel has a relatively small diameter so that it may be driven at a high rate of speed to minimize any rotational speed variations of the water wheel itself. The water wheel is non-rigidly coupled to the drive shaft of the nozzle by a helical gear which causes the drive shaft to rotate at a slower rate than that of the water wheel.

Abstract: A hydrotherapy apparatus having a single nozzle which is continuously rotated through a circular path by a water wheel. Conduits divide a source of pressurized water into first and second portions, the first portion flowing past the water wheel before rejoining the second portion. Thereafter both portions flow through a venturi where they are aerated, through the center of the rotating flywheel, and through the rotating nozzle from which they are discharged. A valve can be manually adjusted for varying the amount of pressurized water that flows past the water wheel to alter its speed of rotation.