Abstract: In order to achieve a high cooling power while avoiding troublesome cold air flows, a chamber (2) is sealed, from the room to be cooled, by a thin cooling wall (1) of powder-coated steel with micro-holes which are arranged in a square 5 mm grid and have a diameter of 0.5 mm and whose free cross-section is consequently less than 1%. An antechamber (4) which is connected to the chamber (2) through a partition (3) by means of a distributor nozzle (17) and has air connections for connection to an air supply or an adjacent air-cooling element is arranged above the chamber (2). The cool air is introduced into the chamber (2) via the distributor nozzle (17) in such a way that it passes with high turbulence along the inside of the cooling wall (1). An air-cooling arrangement consists of rows, arranged side by side, of air-cooling elements whose antechambers (4) are connected by connecting nipples which each project into connecting orifices (10) of adjacent air-cooling elements.

Abstract: In order to cool a room, a cooling element fitted in the ceiling region is cooled to below the freezing point, preferably to about −40° C., during the cooling phases so that condensate forming thereon freezes immediately. During regeneration phases when the room is not in use, the cooling element is defrosted and the melted condensate is caught in a condensate tray beneath the cooling element and drained via a discharge. The great temperature difference between the room to be cooled and the cooling element also makes it possible to obtain a strong cooling effect with a small cooling element, especially by indirect radiation exchange between the room and the cooling element via an intermediate ceiling. The air in the room is also dehumidified since water vapor is deposited on and bonded to the cooling element in the form of ice.

Abstract: An elongated relatively thin, elastic, flexible and resilient nail which, before emplacement in and along the medullary canal of a fractured bone, has a generally curved or arcuate form so that when flexed and stressed by insertion into and along the canal, its pointed proximal end may be facilely directed into the canal of the superjacent fragment, and finally into the trochanter. By turning the nail during emplacement the proximal end may be employed to rotate and adjust the bone fragments into correct or normal relation for healing. A tool or set is detachable connectable with the distal end of the nail, to facilitate emplacement and removal thereof.

Abstract: The nail has a proximal driving-and a distal attachment-end-portion and intermediate portions of different shapes, resiliencies, lengths, non-uniform curvatures, bends and thicknesses, designed for driving it through the hollow of the fractured bone and for rotationally correctly resetting the bone in position with optimum ease and efficiency and for holding it fixedly reset until the fracture heals. A matching tool set for the temporary attachment of the proximal end of the nail for the driving, rotation and withdrawal of the nail operations is provided in a package with a plurality of nails of different sizes to be available instantaneously to the surgeon in an emergency.