Abstract: A detector for scanning electron microscopes, which can be used under different pressure conditions in the specimen chamber of the electron microscope, designed for the detection of both electrons and light. For this purpose, the detector has a photodetector and a scintillator of a material transmissive for visible light connected before the photodetector. The scintillator can be provided with a coating transparent to visible light. By the application of different potentials, the detector is suitable for the detection of electrons in high vacuum and for the detection of light with high pressures in the specimen chamber.

Abstract: Screw (10) for use in the attachment of synthetic sheet materials to a supporting structure wherein screw (10) is manufactured in integral pressed form. Screw (10) includes head (50), shank (30) and tip (12) and is provided which at least one cutting member (20) which extends radially outward from shank (30). Cutting member (20) is separated from head (50) by a distance sufficient to accommodate washer (40) and cuts an aperture in the synthetic sheet material to allow the material to expand and contract without consequent damage from shank (30). Screw (10) further includes thread (11) extending to tip (12) with at least one cutting surface (15) extending through thread (11) adjacent tip (12) for penetrating and self tapping into wood or metal supporting structures.