VERTICAL ILLUMINATORS, METALLURGICAL MICROSCOPES IOI 



scope, consisting, as usual, of stage and substage, but with this 

 difference, the tube and pillar are detachable from the stage, and 

 the substage and support detachable from the base. By attach- 

 ing the microscope and pillar to the base there is obtained a 

 works microscope applicable to the study of large castings. The 

 area of the casting to be studied is visible in the microscope in 

 the opening between the legs of the horse shoe base. Light from 

 a suitable radiant is deflected by the mirror m into a right-angled 

 prism attached to the end of the illuminator. 



For the proper illumination of the objects, the methods and 

 precautions already described on pages 78 to 82 are obviously 

 equally applicable. 



