Abstract: An X-ray analysis crystal is also curved in a direction transverse to the dispersion direction to increase the radiation efficiency. As a result of this radiation diffracted at the crystal is focused towards a detector input. In order to ensure a non-deformable crystal surface the crystal is preferably bonded to a carrier having an adapted bonding profile.

Abstract: Using a belt transmission and guide wheels, a linear drive for a detector arm of an X-ray monochromator is simply obtained, the angle between the detector arm and the crystal arm always being accurately equal to the angle between the crystal arm and the entrance slit.

Abstract: In a cathode ray tube including deflection coils for deflecting an electron beam produced in the tube by an electron gun, the center of the electron gun's focusing lens is positioned to coincide with the deflection point of the deflection coils. This positioning compensates for curvature of the deflection field.

Abstract: By causing the deflection of an electron beam (13) in a cathode-ray tube having a main system of deflection coils (4) and a system of post-deflection coils (5) to take place on the side of the display screen of the main system of deflection coils, which system of post-deflection coils causes a post-deflection of the electron beam opposite to the deflection by the main system of deflection coils which after deflection is synchronous with and weaker than the deflection by the main system of deflection coils, it is possible to choose the place of the (virtual) deflection point of the combination of main and post-deflection coil system more or less at will. By choosing L, the distance from said virtual deflection point to the display screen, to be substantially equal to 21, where l is the effective length of the overall magnetic deflection field, a substantially anastigmatic deflection sytstem is obtained.

Abstract: A luminescent screen consisting of one self-supporting monocrystalline body and having a luminescent surface layer with V-shaped grooves. Such screens may be exposed to radiation having a larger energy than was usual so far with phosphor screens and have a very large luminous efficiency. In addition the resolving power is very large since there are no particles with limiting dimensions. Such screens may be used for displaying very bright pictures suitable for projection on a projection screen.