Abstract: The invention contemplates selectively engageable/disengageable coupling mechanism within the respective drive trains which impart two-component displacement to a mechanical stage such as a microscope stage. For each component of drive, a pressure roller is selectively interposable between a drive-side friction wheel and a driven-side friction wheel which are engaged only when the pressure roller is in loaded contact with both of these wheels.

Abstract: The invention contemplates a photometer tube having a rotatably mounted slit-diaphragm insert, with provision for scanning a specimen object through the slit, in the direction perpendicular to the instantaneous longitudinal orientation of the slit. In a first embodiment, the rotatable slit is coupled with an angle transmitter which supplies a control signal for scanning by a motor-driven X-Y specimen stage. In a second embodiment, the diaphragm holder itself is mounted on a carrier, for lineal displacement on the carrier in the direction perpendicular to the direction of the slit, and the carrier is rotatable to permit slit orientation with respect to a pattern of interest in an observed specimen.

Abstract: The invention contemplates provision of an additional selectively adjustable transmission mechanism, in the coupling of a microscope stage to focusing mechanism within the microscope stand. In the disclosed embodiment, the stage is mounted to a stage carrier (7) which is guided in the stand, and the additional transmission is provided between the stage carrier and the output rack (5) of the primary rack-and-pinion coupling of the focusing mechanism for the stage. The focusing mechanism is of the coaxial coarse-fine variety, with output to the pinion (4) of the coupling. In the additional transmission, an eccentric (11) is journaled for selective rotation in the stage carrier (7), the rack (5) of the coupling has an independent vertical guidance relation (9) with the stage carrier (7), and the rack (5) and eccentric (11) coact to establish instantaneous relative elevation of the stage (6) with respect to the rack (5).

Abstract: The invention contemplates adjustment mechanism for a pancratic objective, wherein each of two differently displaceable lens holders are nevertheless correctly driven by a single manual driving rotation, there being a variable-length corrective connection between the respective lens holders, and there being means operated upon manual adjustment of one holder for correctively varying the length of the connection to the other lens holder.