Abstract: A method for controlling the change in color of several sheets of an electrochromic glazing. This color change of the individual sheets within a color-change interval is controlled by individual control units, driven by a central control unit. To achieve a uniform change in color over all the electrochromic glazing sheets, the color-change interval is subdivided into a number of subintervals, whose duration is selected such that the difference in the degree of light transmission between individual electrochromic glazing sheets remains negligible. The individual control units control the change in color of the electrochromic glazing sheets progressively, using the subintervals, whereby the central control unit only begins to change the color of the electrochromic glazing sheets using a new subinterval, once all the glazing sheets which are in perfect working order have completed the change in color that has been performed during the previous subinterval.

Abstract: A television picture tube which includes a composite frontal plane comprising a viewing screen which is spherically or aspherically convexly curved relative to the viewer. A convexly curved supplementary plane, preferably made of clear glass, gray glass or machine glass is spaced from the viewing screen by a transparent cast resin layer inserted between the viewing screen and the supplementary pane. The resin layer glues the screen and the pane to one another and has a refraction index which corresponds approximately to that of the supplementary pane and the viewing screen. The supplementary pane is cylindrically curved only about the panes vertical axis and its radius of curvature is significantly larger than the radius of curvature of the viewing screen.

Abstract: A multiple component electrical heating device for mirrors including at least one plate-shaped electrical heating element having two main faces being connected with two of at least three metal strips which are spaced from one another and extend parallel with each other, in an electrical current-conducting and heat-conducting manner. A first one of the two main faces of the heating element is in electrical current- and heat-conducting contact with at least a first one of the metal strips and is electrically and heat-insulated from the two strips next adjacent the first metal strip. A metal bridge connects with one another, in electrical current- and heat-conducting contact, the two metal strips next adjacent the first metal strip. The other main face of the heating element is in electrical current- and heat-conducting contact with the metal bridge.