Abstract: This invention relates to an improvement in an apparatus for ammonia feed in copying equipment with a cold trap, for freezing out ammonia and water from air extracted from the immediate vicinity of a developing chamber, in particular from pre-chambers, together with a rectifying column for releasing ammonia from the frozen-out ammonia-water mixture and recycling the gaseous ammonia into the developing chamber, the improvement comprising heat exchanger means,With two heat-conducting channels adjacent each other through which the extracted air flows counter-currently, a cold source inSaid heat exchanger means, said source being at a transition position between said channels and surrounded thereby, heat source meansAdapted to heat said heat exchanger means, outlet means on said heat exchanger means, means connecting said outlet means on said heat exchanger means to said rectifying column, and means connecting said rectifying column to said developing chamber.

Abstract: This invention relates to a process for conducting ammonia in a diazo copying machine which comprises passing ammonia-containing exhaust air by first conduit means from a developing station of said copying machine through a cooled heat exchanger in which the ammonia and water is frozen out, then heating said heat exchanger to a temperature at which the water and the ammonia are liquified, passing the mixture of liquified water and liquified ammonia to a releasing station, adding fresh ammonia water to the liquified water and to the liquified ammonia, passing it together with the liquified water and liquified ammonia in the releasing station counter-currently to vapor produced by a vapor-generating means, and conducting the gaseous ammonia to the developing station, said process employing two heat exchangers, the first heat exchanger through which the exhaust air is passed being cooled and the second heat exchanger being heated for liquifying the ammonia and water frozen out during the preceding process step,

Abstract: An apparatus for developing photosensitive material with a gaseous medium comprising a housing having a developing chamber therein, at least one rotor in said developing chamber, said rotor extending over substantially the entire width of material to be developed and being mounted at a distance of about 0.05 to 20 mm from the material to be developed, a device for introducing gaseous developer medium between the rotor and the interior walls of said chamber, and a device for passing material to be developed through the apparatus, whereby it contacts said gaseous developer medium.

Abstract: An apparatus for producing a gaseous developer medium for diazo-type material having a distillation column through which fluid developer solution and vapor pass counter-currently. An outlet on the distillation column is connected to a developing chamber. An inlet on the distillation column serves for feeding developer solution therein. The apparatus further includes a vapor generator connected to the distillation column by a direct conduit.