82 PHOTOGRAPHIC PROCESSES. 



genuity and patience severely taxed, but practice 

 will enable him soon to overcome the difficulties. 



Having cleaned and prepared the plates in the 

 same way as when about to coat them with collo- 

 dion, we hold them in exactly the same manner, 

 that is, between the finger and thumb of the right 

 hand, or by a pneumatic holder. One is now warmed 

 and a little more than one drachm of the melted 

 emulsion poured on, spreading it evenly over the 

 surface with a swaying motion. When covered, 

 keeping it horizontal we place it on some perfectly 

 level surface, (such as a large sheet of plate glass), 

 to set. 



A sufficient number being prepared and allowed 

 to set, they are placed in a drying closet. Of these 

 there are innumerable forms, the arrangement we 

 leave to the reader, simply stating that the plates 

 must be kept horizontal and as strong a current of 

 heated air as can be obtained, allowed to pass across 

 their surfaces. Every glimpse of actinic light being 

 excluded during the process. 



For further details we recommend Abney's Emul- 

 sion Processes. 



The plates being prepared according to the fore- 

 going instructions, or better still procured from 

 some respectable firm, the following articles are ob- 

 tained. 



A dish, preferably of ebonite, just large enough to 

 hold a quarter plate. 



Another of the same material to hold four or a 

 larger number will be found very useful, as a great 



