PHOTOGRAPHIC PROCESSES. 79 



The dark slide enveloped in a dark cloth is now 

 placed in the camera, care being taken to keep the 

 side of the plate which was uppermost in the bath, 

 in the same position in both dark slide and camera. 



The requisite exposure being given, the slide is 

 carried back to the dark room, its original position 

 being still maintained. The developer is poured 

 into a glass measure, and the plate covered with the 

 solution in the same manner as it was with collodion, 

 care being taken that none flows over the edges. 



If the picture flashes out at once, over-exposure is 

 indicated; the developer should immediately be 

 dashed off, and the plate washed under the rose tap. 



Should it develope gradually the developer should 

 be swept slowly backward and forward over the 

 plate, as long as the action is apparent, and removed 

 before any symptoms of fogging make their appear- 

 ance. 



The plate is now thoroughly washed, and if not 

 sufficiently dense, the intensifier is poured over it, 

 while upon it a few drops of nitrate of silver is 

 placed in the measure ; the intensifier is then poured 

 back into the measure and the mixed solutions again 

 swept over the plate. 



Intensification requires great judgment and should 

 only be continued as long as all detail is perfectly 

 clear; the instant, or better before, the slightest 

 fogging appears, the intensifier should be removed 

 and the plate again well washed. 



We now immerse it in the hypo-solution, where it 



