Abstract: A telescope has at least one barrel. At least three optical elements, namely an objective lens, an inverting system, and an eyepiece are arranged within the barrel along a longitudinal axis thereof one behind another. Further, means are provided for compensating shaking movements of the barrel by moving at least one of the optical elements relative to the barrel. The objective lens and the eyepiece are, preferably, rigidly connected to the barrel. The inverting system is adapted to be moved transverse to the longitudinal axis.

Abstract: A telescope has at least one barrel. At least three optical elements, namely an objective lens, an inverting system, and an eyepiece are arranged within the barrel along a longitudinal axis thereof one behind another. Further, means are provided for compensating shaking movements of the barrel by moving at least one of the optical elements relative to the barrel. The objective lens is rigidly connected to the barrel. The inverting system together with the eyepiece constitutes a common assembly. At least a part of the assembly is adapted to be moved relative to the longitudinal axis. As an alternative, the inverting system and the eyepiece are rigidly connected to the barrel and at least a part of the objective lens is adapted to be moved relative to the longitudinal axis.

Abstract: A closure counter for counting how many times a screw cap closure has been closed and opened is described, which is back in its initial position after N closing and opening operations.The closure counter includes an open-bottomed housing (10) and a likewise open-bottomed cap-shaped counting unit (11) arranged in the housing for rotation about its longitudinal axis (12), the rotary motion relative to the housing (10) is limited to a fraction 1/N of one full rotation, and a display unit (13) is arranged for rotation about the longitudinal axis (12) of the counting unit (11), the rotation of the display unit (13) relative to the counting unit (11) being allowed in only one direction by a ratchet (14), the click motion likewise corresponds to the fraction 1/N of one full rotation, and there is sliding fit between the housing (10) and the display unit (13).

Abstract: A rotary piston pump for the displacement of blood has a single-lobe trochoidal surface along the peripheral wall of a housing and an eccentrically displaced rotary piston having a pair of opposite edges confronting this surface. The edges confronting the surface are rounded of circular arc curvature with a radius less than the equidistant between the theoretical epitrochoid of the orbits of these edges and the surface. A gap seal is thus provided which prevents damage to blood vessels when the pump is used for the circulation of blood, e.g. in an artificial heart.

Abstract: A rotary pump has a trochoidal member and a trochoidal rotary piston which preferably forms a gap seal with the trochoidal surface of the housing so that damage to blood cells and the like is avoided when the pump is used as an artificial heart or to assist circulation. The rotor is jounaled on an eccentric within a housing which may be the casing of an electric motor for driving the pump. The motor and its speed reducer, preferably planetary gearing, are disposed wholly within the rotor.