Abstract: A method of building a sea wave power plant of the type in which the power plant (11) must be installed near a steep rock wall (1). The installation site is determined inside the rock formation (F), at a distance from the open rock surface (1). A power plant well which is also serving as a building site (3) is blasted out from the rock formation with a natural rock wall (4) separating the well from the sea. After the plant is completed, the well is filled with water and the partition wall is removed by blasting, opening the well to the sea.

Abstract: A wave energy power station comprises two water-filled chambers in communication at the bottom, wherein a first chamber is in communication with the sea at the upper end thereof and the second chamber is defined by one or more walls which project above the surface of the sea, such that pressure variations in the sea owing to the waves will set the water in an oscillating movement between the two chambers, and energy being tapped from the oscillating system, for example, by allowing the water in the chamber which is not in communication with the sea to overflow periodically into a reservoir, from which it is led back to the sea through a turbine, or by utilizing the water column in the second chamber for drawing in and compressing air which drives an air turbine.

Abstract: Organic waste is composted whereby it is brought into repeated sliding layer contact with an air current. This contact is provided for in an inclined, rotating cylinder.

Abstract: A method of grinding material in a disc mill, the mill being operated at maximum r.p.m. corresponding to three to four times the critical velocity and is restricted only by injurious vibrations due to unbalanced masses so that the grinding material is centrifuged and forms a layer on the internal surface of the mill cylinder, the thickness of this layer being restricted by a suitable member. A disc mill for carrying out the method is also disclosed, the mill having free grinding discs of the same diameter, equal to about two thirds of the diameter of the mill cylinder, the discs being collected in an effective grinding area with a length about two thirds of the diameter of the cylinder.

Abstract: In a marine vessel having a hull structure for transporting or storing a cargo tank adapted to contain liquefied and/or compressed gas, the tank is supported by an annular skirt having opposed edges integrally secured respectively to the hull structure and to a peripheral portion of the tank; the skirt minimizes the stresses transferred between the tank and the hull structure and is adapted to accommodate changes in the dimensional characteristics of the tank, due to temperature changes therein, independently of the hull structure.