Abstract: A control valve for a water sprinkler has a passage therethrough and a rotary member under the control of a stepping motor or equivalent rotatable to increase and decrease the area of the passage. A sensor detects the output pressure at the valve and at a predetermined pressure reverses the direction of rotation of the stepping motor and rotary member.

Abstract: A free standing, vertical axis rotor employs both fixed and pivoted airfoil blades assembled on a triangular rotor frame. The angle of attack of the pivoted blades is controlled with reference to the prevailing winds. The rotar base terminates on a ring shaped tower mounted on guiding wheels disposed in a circular pattern on pillars. The revolving ring shaped base forms the armature of an energy converter by electromagnetic induction allowing thereby the conversion of rotary motion to electric energy at ground level.