Abstract: Various embodiments relate to device including a hollow box, having a central rectangular cuboid with a first edge, second edge and a third edge and four faces, where the first, second and third edges are perpendicular and so define the cuboid in three dimensions, two opposed irregular triangular prism-shaped wings with each irregular triangular prism-shaped wing attached to a full first edge and a full second edge, and a fourth edge not touching the central rectangular cuboid.

Abstract: Various embodiments relate to device including a hollow box, having a central rectangular cuboid with a first edge, second edge and a third edge and four faces, where the first, second and third edges are perpendicular and so define the cuboid in three dimensions, two opposed irregular triangular prism-shaped wings with each irregular triangular prism-shaped wing attached to a full first edge and a full second edge, and a fourth edge not touching the central rectangular cuboid.

Abstract: The invention relates to an absorption refrigerating machine and a process for the operation thereof. It can be used as a household cooling appliance, for example as the last link in the cold chain, or for the cooling of medicine or as a refrigerating set of an air-conditioning system, and use in a stand-alone variant without an electrical energy connection is possible. The absorption refrigerating machine has a condenser, an evaporator and an absorber, and a refrigerant-absorbent mixture can be circulated through all three. There is also at least one solar collector for heating to above the refrigerant boiling point and a refrigerant storage unit connected to the condenser. High-pressurized liquid refrigerant is held in the refrigerant storage unit, and an absorbent storage unit and a desorbent storage unit are connected to the absorber.

Abstract: An arrangement for projecting film pictures in which a system of lenses are provided on the side of a window facing the light source. A first mirror in the light beam projected by the lens system, forms an angle with the axis of the light beam. The first mirror is rotated about the axis of the light beam, and a second mirror is located in the light beam deflected by the first mirror, at a first rotated position of the first mirror. The plane of the second mirror forms an angle of substantially 45.degree. with the plane of the first mirror located in the first rotated position. A third mirror is located in a second rotated position of the first mirror in the light beam deflected by the first mirror. The plane of the third mirror forms an angle of substantially 45.degree. with the plane of the first mirror when located in the second rotated position.