Abstract: In the light-converting device the light-converting elements (11) are arranged at least on two levels. They are placed on the strips (17). The design is supported at least by one pole (23). Because of it in this device light-converting elements may be arranged on many levels and consequently much less place for it is required and new possibilities appear. The device may be installed for instance on a roof of buildings in the best direction at any side of inclined roof. The device may also be installed on slopes of mountains, in rivers, lakes, coastal zones of seas and oceans, on vehicles, and trailers. The device may be installed on ships standing immovably not very far from the coast and connected to the coast by a cable. The device may be used on military bases, and on the moon. The device is used on military bases will decrease dependence on the fuel supply.

Abstract: A wind power plant includes four main elements: a foundation (29), at least one supporting structure (21), a carrying construction (23) having a vertical axis (25) and being rotatable around the vertical axis, and at least one rotor (45), (49), (52) positioned on the carrying construction. The rotors can have horizontal, vertical, and inclined axes of rotation in different combinations. Each rotor has at least two blades (53) arranged along its axis of rotation. Since the rotors used in the invention have a small diameter, the wind power plant can produce energy under high and low wind speeds, consequently producing more energy per year than known wind turbines. Also, because the rotors have rectilinear blades for their manufacture expensive composite materials and complicated expensive equipment are not required. For these reasons the wind power plant of this invention will produce energy at lower cost.

Abstract: A reciprocating piston engine (or motor) includes plural reciprocating pistons operatively connected to a single intermediate oscillating shaft, and a crankshaft having a single crank pin operatively connected to the oscillating shaft, so that the crankshaft experiences one complete revolution for each back-and-forth reciprocation of the pistons. The connection between the pistons and the oscillating shaft can include a rack-pinion drive system or a link-lever drive system. The connection between the oscillating shaft and the crankshaft can include a sector gear in mesh with a toothed rack that operates a connecting rod attached to the crank pin; alternately a lever-connecting rod drive mechanism can be used between the oscillating shaft and the crankshaft.