Abstract: An illumination system according to the invention has three radiating units along each longitudinal side and two radiating units along each transverse side of the illumination system. The radiating units are arranged symmetrical to the imaginary center lines in longitudinal and transverse directions of the illumination system. Each individual radiator unit at the transverse side includes a radiating source surrounded by three heat-protection filters while, in each of the three radiator units along the longitudinal side, one of the heat-protection filters is substituted by a reflector plate. The reflector plates of the left-hand and right-hand radiating sources are beveled rectangles, while the reflector plate of the middle radiating source is a rectangle without a beveled upper edge. Along the longitudinal and transverse sides of the illumination system are arranged reflectors, which consists of two reflector parts, which are detachable from each other at a separating point.

Abstract: An apparatus for producing a gaseous developer medium for a diazotype material from a developer solution, which apparatus comprises a vessel provided with a heater and an outlet for residual liquid, for generating a stream of vapor from a liquid,A conduit in which a stream of developer solution flowing in one general direction can come into contact with a stream of vapor flowing in the other general direction, which conduit communicates at one end with the vessel and is provided at, or in the vicinity of, the other end with an inlet for the developer solution,A condenser which communicates with the end of the conduit remote from the vessel, the condenser having an outlet for gaseous developer medium and an outlet for condensed developer medium,And a vaporizing vessel adapted to be located in a developing chamber for diazotype materials, which vaporizing vessel communicates with the outlet for condensed developer medium.

Abstract: In an apparatus for developing light-sensitive material with a gaseous medium comprising a developing station in communication with a vaporizer, at least one heater in each of said developing station and vaporizer, at least one temperature control inside said developing station, said control at a certain temperature in said developing station actuating said heater in said vaporizer, and said developing station attaining its predetermined temperature at the latest at the time when said vaporizer attains its predetermined temperature.