Abstract: The apparatus comprises a metering roller (7) for the metered supply of liquid developer to an applicator roller (10). A profiled roller (11) is provided for pressing the photosensitive stock against the applicator roller. The profiled roller has a cylindrical core (12). The outer surface of the core is completely covered with a coating (13) of a permanently elastic material. The surface of the coating remote from the core is provided with projecting, mutually staggered, substantially conical or pyramidal nubs (14). The nubs are made of the same permanently elastic material as the coating. A pressing roller (17) rests against the profiled roller and, in the direction of travel designated from I to O of the stock to be developed, precedes the point of contact of the profiled roller against the applicator roller. Stock inserted at I is grasped at the point of contact (19) between the pressing roller and the profiled roller and conveyed on.

Abstract: A diazotype material is disclosed containing a novel 2-substituent-3-thio-5-alkoxybenzene diazonium compound of formula I ##SPC1##whereinX is an anion,A is the group ##EQU1## or -- OR.sub.4 in whichR.sub.1 is hydrogen, an alkyl radical with 1-8 carbon atoms, a substituted phenyl, cycloalkyl, or aralkyl radical or a heterocyclic radical,R.sub.2 is an alkyl radical with 1-8 carbon atoms, a --COOR.sub.5 group in whichR.sub.5 signifies hydrogen, an alkyl radical with 1-8 carbon atoms, a cycloalkyl, aryl, aralkyl, or alkylaryl radical or a heterocyclic radical, or a group of ##EQU2## in which R.sub.6 and R.sub.7 stand independently of one another for hydrogen or a hydroxy, alkoxy, alkyl with 1-4 carbon atoms, or phenyl radical,R.sub.1 and R.sub.2 together with the nitrogen may be a morpholino, a methyl-substituted morpholino, pyrrolidino, or piperidino group,R.sub.3 is an alkyl radical with 1-8 carbon atoms, an aralkyl, alkoxyaryl, haloaryl, alkoxyalkyl, or cycloalkyl radical or a heterocyclic radical, andR.sub.