i6o 



MICRO- ME TA L L OCR A PH Y 



[CH. VI 



' ■ 



Fig. 126 A. Microscope especially constructed for the study of metals and 

 alloys. ( The Boston Testing Laboratories). 



The stage is rotary , and may be raised or lowered by rack and pinion. Above 

 the objective is the arrangement for illumination (see Ch. VII). 



