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A diazo copier having an exposure section, an ammonia developer section, a copy degassing section, and an enclosed copy receptacle. To develop an exposed copy, it is contacted with ammonia vapors in the development section. The ammonia vapors absorbed by the copy material are released by heating the

A diazo copier having an exposure section, an ammonia developer section, a copy degassing section, and an enclosed copy receptacle. To develop an exposed copy, it is contacted with ammonia vapors in the development section. The ammonia vapors absorbed by the copy material are released by heating the copy to an elevated temperature in the degassing section from which the copy is deposited in the enclosed receptacle. The released ammonia vapors are removed from the copy by circulating a stream of air through the receptacle and around the copy.

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In a machine for developing light sensitive copy material by contact with ammonia developing gasses having a developer chamber constructed and arranged to contact light sensitvie copy material with ammonia gasses to develop such copy material, a pump driven by an electric motor and constructed and a

In a machine for developing light sensitive copy material by contact with ammonia developing gasses having a developer chamber constructed and arranged to contact light sensitvie copy material with ammonia gasses to develop such copy material, a pump driven by an electric motor and constructed and arranged to deliver ammonia gasses to said developer chamber when operated by said electric motor, a degasser passage constructed and arranged for developed copy material to pass through after being contacted with the ammonia developing gasses, heater means cooperating with said degasser passage and constructed and arranged to heat the developed copy material to an elevated temperature to accelerate the release of ammonia vapor from the copy material, the improvement comprising an enclosed receptacle communicating with said degasser passage and constructed and arranged to receive developed copy material from said degasser passage, said receptacle having an outlet which can be opened and closed and when opened through which developed copy material can be removed from said receptacle, at least one air inlet communicating with the interior of said receptacle, said pump having sufficient capacity when continuously operated by said electric motor to supply a greater quantity of ammonia gasses to said developer chamber than the minimum quantity of ammonia gasses required to develop such copy material, a control device connected with said electric motor, said control device having a variable duty cycle and being constructed and arranged to intermittently operate said electric motor to intermittently drive said pump such that only essentially the minimum quantity of ammonia gasses needed to develop such copy material can be supplied by said pump to said developer chamber, and a blower constructed and arranged to move a stream of air through said inlet, around developed copy material in said receptacle and through at least a portion of said degasser passage adjacent said heater means such that essentially all ammonia is removed from developed copy material received in said receptacle before such developed copy material is removed from said receptacle.