THE LABORATORY. Ill 



unsatisfactory. The drawings are made upon bristol board 

 with an ink containing alum and these are given to the com- 

 pany who produce facsimiles, but they are always muddy and 

 blurred. 



For all other photo processes the drawings require that 

 each line should be perfectly black and smooth. The draw- 

 ings should always be made on bristol board. No wash 

 tints or pencil work will take, but all shades have to be ex- 

 pressed either by lines or dots. Winsor and Newton's liquid 

 India ink produces good results, especially if more cake ink 

 is rubbed up with it. 



Of the photo processes the photo-lithographic is the most 

 satisfactory but this cannot be used along with press work, 

 but requires separate plates. The various processes for pro- 

 ducing raised plates (photo-electrotypes) do not vary much 

 and the chief distinction between them seems to lie in the 

 skill of the operators. The writer has noticed, however, that 

 by whatever process, if a poor electrotype resulted, it was 

 always attributed to the fault of the one furnishing the draw- 

 ing, and not to any fault of the photographer, electrotyper or 

 of the process. 



