Abstract: A sterilizer comprises a sterilization chamber (1) with a test device (2) for testing the effectiveness of a sterilization process. The test device (2), in turn, comprises a test element (3) with a sensor (4) for measuring at least one parameter, and cooling mechanism (5) for cooling the test element (3). The test device (2), as a whole, is completely accommodated within the interior (8) of the sterilization chamber (1).

Abstract: A sterilizer comprises a sterilization chamber (1) with a test device (2) for testing the effectiveness of a sterilization process. The test device (2), in turn, comprises a test element (3) with a sensor (4) for measuring at least one parameter, and cooling mechanism (5) for cooling the test element (3).

Abstract: An air-cooled internal combustion engine having a series of in-line cylinders with a cooling air blower adjacent an end cylinder. The blower delivers a stream of cooling air in the longitudinal direction of the engine which is redirected by air guide means laterally across the cylinders. To facilitate locating the blower nearer to the longitudinal central plane of the engine, several laterally spaced cooling fin parts are formed on the head structure of the end cylinder in alignment with the direction of flow of the stream of cooling air from the blower so that the overlapping relationship between the end cylinder head structure and the cross section of the blower does not adversely impede the air stream from the blower.

Abstract: An arrangement for cooling the pistons and cylinder sleeves of an internal combustion engine. An annular cooling chamber is provided in the piston, and is open along the circumferential surface of the piston in the direction toward the cylinder sleeve. This cooling chamber is divided into subchambers over a portion of its axial height. Cooling medium is supplied into a given subchamber, while cooling medium is withdrawn in the adjacent subchamber. The portion of the cooling chamber which is free of partitions may be embodied as an annular groove which is disposed radially inwardly of the piston rings. The particular cooling effect is essentially brought about by the back and forth movement of the cooling medium not only axially but also in the circumferential direction in the annular groove. In so doing, the cooling medium wets the cylinder sleeve during the up and down movement of the piston.

Abstract: A cylinder head, for a water cooled internal combustion engine, which reduces the thermal stresses. The gas-changing channels and the oil-return channels are located on one side. A main water overflow, in conjunction with an oppositely located auxiliary water overflow, makes possible a precise or directed flow along the valve land portion and around the turbulence chamber or the injection nozzle channel, whereby the flow is kept along the cylinder head bottom by a roof-shaped wall on the side remote from the cylinder block. The strength of the cylinder head is increased, and the oil removal is improved, by associating an oil-return channel with each cylinder. Specially shaped cylinder head screw channels increase the compression or pressure against the combustion chamber walls and effect a more uniform pressure distribution. A more favorable sealing behavior is attained by compensation or expansion curvatures in the cylinder head cover plate.