Abstract: The invention relates to a changeover system for optical components such as filters, reflectors, polarizers and lens systems in optical equipment, particularly microscopes, a so-called reflector revolving nosepiece. The elements carrying the optical components, the so-called reflector blocks, are held by spring force against precision stops on the revolving nosepiece. For this purpose, the reflector blocks have lateral flanges that are respectively held against precision stop surfaces on the revolving nosepiece, by two respective leaf springs. The direction of the spring forces is mutually inclined, so that an outer edge of the flange is pressed into the interior edge formed on the revolver by two mutually perpendicular surfaces. The invention makes possible a rapid and simple fitting and changeover of reflector blocks without the use of tools.

Abstract: The invention relates to a rotary vane gate for free-flowing bulk material and Comprises a housing provided with housing covers on the end faces as well as with an inlet opening and an outlet opening and a compartmentalised wheel disposed in the housing with a rotatably mounted drive shaft, the wheel having compartments which are axially delimited by limiting plates 11. With a view to a construction which is particularly resistant to pressure shocks and is safe against penetration of flames, a sealed wear plate is provided between each limiting plate of the wheel and the neighbouring housing cover and at least one bypass chamber is provided between this wear plate and the limiting plate. The axial internal width of the inlet opening corresponds at most to the axial internal width of the compartments and the axial internal width of the outlet corresponds approximately to the overall length of the wheel including the bypass chambers.

Abstract: A transparent multifunction display field (LCD display 23) is reflected by means of a transmitted-light projection ray path (21-27) into the intermediate image plane (11) of a photomicroscope.The LCD display (23) provides the viewer with information on the status of the microphotographic system by showing, superposed on the object image, corresponding symbols and numbers, illustratively for the nature and picture format of the camera used, its exposure counter, position and size of the spot used for the exposure-time measurement, the thus-determined exposure time, flashlight function, etc.