Recent developments in multicolor storage tubes

Multicolor storage tubes for applications involving low frame rates have been built by modification of direct-viewing storage tubes. A perforated shadow-mask is placed between the three writing guns and the storage surface. This mask allows electrons from each writing gun to strike discrete storage areas, each containing a single aperture in register with a color dot on the view plate. In this way it is possible to write and store electrical signals independently in adjacent color areas. The design and operation of the tube are discussed in detail. Several sources of color impurity are described, together with the steps taken to minimize their effects.