Abstract: The servo tracker of the instant invention comprises an apparatus for positioning of a major reflector to compensate for relative movement between the Earth and Sun. A base member supports a movable major reflector and a fixedly positioned minor reflector. The major reflector is movable in both a north/south and east/west direction. When correctly positioned, the major reflector directs the light rays of the Sun toward a major target where useful energy is produced. When correctly positioned, a portion of the reflected light rays from the major reflector are reflected by the minor reflector toward a minor target positioned adjacent a pair of sensors. When the major reflector is improperly positioned due to relative movement between the Sun and Earth, the reflected light rays from the minor reflector are directed toward one of the sensors depending at which axis the major reflector is improperly positioned and the direction required for repositioning to a correct position.

Abstract: An engine, or prime mover, utilizing the various expansion properties of a gas or fluid, hereinafter termed the "working fluid", for converting the pressures associated with said expansion properties into useful work. The engine having a "piston" and "cylinder" arrangement, with suitable valves, camshafts, etc., whereby expansion of the working fluid moves the "piston" exhibiting kinetic energy in accordance with the magnitude of the kinetic effects on the piston.