Abstract: A magnetic actuator for controlling the electrical induction in a pickup coil to a predetermined speed of rotation of a workpiece actuated shaft consisting of a series of magnets in a fixed circular relationship to a rotating shaft and a complimentary series of magnets positioned on the first series and magnetically retained thereon, a series pickup coil also circularly posiitoned relative to the rotating shaft but of a greater diameter than the ring formed by the magnets, and upon the rotation of the shaft workpiece, the magnets with continue to the attracted; as the rotation increases the centrifugal force of rotation increases and as the speed of rotation attains a given speed, the centrifugal force exceeds the magnetic attraction between the two series of magnets; at this speed the second series of magnets will move outwardly from the rotating shaft; the mgneticfield of the moved magnets become vertically aligned with the series pickup coil and wherein the magnetic-field induces an electrical potential in

Abstract: A fluid velocity actuated structure for a wind mill/water wheel, comprising an elongated cylinder with blades/fins hingedly supported thereon. When exposed to the driving force the one blade/fin will respond by assuming a position of least resistance thereto whereas the 180.degree. opposite blade/fin will assume a position of maximum resistance thereto. The hinge supports for the fins/blades has a swivel structure to permit resiliency in the cylinder to the fluid medium. From the rotating structure there is provided coupling means for converting the rotational force into electrical power. In use as a water wheel in a liquid stream, the cylinder has pump means associated there-with to adjust the depth of the structure in the fluid stream. When said structure is utilized as a wind mill, the cylinder is preferably upright and supported on a base. Within the base are a series of magnets that when electrically actuated, brakes the rotation of the cylinder.