Abstract: A fluorescence detector has a light source in the form of a halogen lamp, a UV-filter which allows excitation radiation in UV to pass through, and a second filter which sorts out fluorescence radiation, and a detector which detects the through-passing fluorescence radiation. The filters comprise thin straight blocks and also function as light guides and are positioned at right angles with their extensions directed towards a point at which a tubular sample can be placed in close with the ends of the filters distal from the light source and the detector.

Abstract: A device for displacing a member, primarily a stage for optical instruments, in arbitrary directions in one and the same plane. The member is basically square, and its respective corners are connected to the middle of each side of a surrounding square frame which is supported on one hand by two substantially vertical rods carried by a base, said rods being attached to two diagonally opposite corners of the frame, and on the other hand by additionally two substantially vertical rods, which latter are suspended above the frame and are attached to the remaining opposite corners of the frame. The member is capable of being positively displaced by means of two articulate rods disposed in different directions in the plane of displacement of the member substantially orthogonal to each other.