Abstract: An optical system is described for merging a first and a second partial image beam emanating from a specimen into a resultant image beam allowing modification of the areal proportion of the respective first or second partial image beam in the resultant image beam. A stop arrangement comprises at least a first and a second movable stop element each comprising at least one stop region adapted to be brought into a working position with the first or second partial image beam. Movably arranged connecting means for connecting the two stop elements are provided to modify the respective areal proportions of the partial image beams in the resultant image beam by movement of the connecting means.

Abstract: An optical system is described for merging a first and a second partial image beam emanating from a specimen into a resultant image beam allowing modification of the areal proportion of the respective first or second partial image beam in the resultant image beam. A stop arrangement comprises at least a first and a second movable stop element each comprising at least one stop region adapted to be brought into a working position with the first or second partial image beam. Movably arranged connecting means for connecting the two stop elements are provided to modify the respective areal proportions of the partial image beams in the resultant image beam by movement of the connecting means.

Abstract: The tendon and/or ligament substitute is inelastic in the longitudinal direction and is formed of a round rope having a core filament and outer filaments of smaller diameter surrounding the core filament. Each filament is encased in a tube to reduce abrasion and a cover holds the various filaments together. The construction of the filaments insures an increase in elasticity from the inside to the outside as required for biological-medical reasons.

Abstract: A refrigerator having a cooled induction motor, the housing interior of which is completely filled with a cooling medium, and having a cooler for the re-cooling of the cooling medium in the housing interior by means of another medium separate from the cooling medium of the motor, in which insulating cooling oil is contained as cooling medium in the housing interior of the induction motor.

Abstract: Variable-speed electric induction motors are known with a closed fluid-flow circuit for coolant liquid driven by a pump operated by the motor. A disadvantage is that the coolant flow varies with speed of the motor. The improvement is that the motor has an ancillary shaft which drives the coolant pump and which is rotated at constant speed irrespective of the speed of the main drive rotor of the motor. The ancillary shaft may be driven by an ancillary rotor cooperating with the main stator of the motor. There may also be provided a coolant fan driven at constant speed, for example by the ancillary shaft and preferably through a releasable clutch.

Abstract: The disclosure is of a variable speed three-phase motor with a intermediate rotor and inner rotor, where the pack of laminations of the main rotor is prolonged as an annular pack of laminations in the direction of the longitudinal axis with short-circuit rods extending over the whole length of the stator, thereby forming an annular intermediate rotor inside which the inner rotor with its short-circuit rods rotates.