Abstract: Plant and method for burning carbonate rock, comprising: a lime shaft kiln with a first kiln shaft and a second kiln shaft, which are operated alternately as a burning shaft for burning raw material and as a preheating shaft for preheating raw material, and with a crossover channel between the first and the second kiln shaft, via which exhaust gases can be transferred from the burning shaft to the preheating shaft, an exhaust gas discharge for discharging exhaust gases from the lime shaft kiln, and an exhaust gas cleaning stage for cleaning the exhaust gases discharged from the lime shaft kiln. The exhaust gas cleaning stage buffers fluctuations in the temperature of the exhaust gases from the lime shaft kiln and comprises at least one regenerator for regenerative heat exchange with the exhaust gases discharged from the lime shaft kiln.

Abstract: The invention relates to a method and plant for producing cement clinker, comprising the steps of: burning raw materials to form cement clinker in a furnace, preheating the raw materials with flue gases of the furnace, and dehumidifying and cooling flue gases of the furnace by means of a condensation heat exchanger.

Abstract: A stack of individual sheets of film is enclosed by lightproof plastic packaging. An opaque sheet is disposed at the bottom of the stack, and the side of the opaque sheet confronting the packaging is provided with a bar code containing information about the film. The packaging is removed in a lighttight area of a processing unit for the film and the bar code is read. The opaque sheet prevents the radiation used to read the bar code from reaching the film. The information retrieved from the bar code is employed to control processing of the film.

Abstract: A device for producing photographic exposures of images appearing on an image screen onto a film platform carrying a plane film comprises a support holding a number of objectives and displaceable parallel to the axis extending through the central point of the image screen and the central point of the film platform. The platform carries one objective fixed to the platform of one magnifying property and four additional objectives which have such magnifying properties that each of them projects the picture field area of the screen on only one fourth of the usable film surface.