Photomicrography 27 J 



B 

 Fig. 17.6— Optical-bench photomicrographic apparatus: A, Bausch &: Lomb appa- 

 ratus with research microscope in place; B, special simplified microscope perma- 

 nently installed. 



4l^-in. plates. Recent developments in the production of fine-grain 

 film of high resolving power will undoubtedly lead to the use of much 

 smaller negatives, especially for expensive color work. 



Light Sources 



The character of the light source and the method of illuminating 

 the object are important factors in photomicrography. Artificial light 

 is in almost universal use because of its constant intensity and ease 



