Nipher — Relation of Direct to Reversed Photographic Pictures. 61 



0.016 of 3200. In these stronger illuminations is therefore 

 a field of promise for positive photography with short expo- 

 sures. It may perhaps require a modification of the developer, 

 the plate emulsion or both, in order to secure the best at- 

 tainable results. 



In one of the figures, the pencil marks put on in the dark 

 room do not agree with the ink marks. The latter are 

 correct. 



Issued June 7, 1901. 



