CH. IX] 



USE OF PROJECTION MICROSCOPE 



255 



1 mm. Field 

 Objectives {JSS: 



O 



2-1.5 mm. Field 

 Objectives i!::; 



O 



2.5 mm. Ffeld 

 Objectives {'? 5 mT 



O 



5 mm. Field 

 Objectives { IS mT 



25-20 mm. Field 

 Objectives {35 



FIG. 144. SIZES OF FIELD AND OBJECTIVES NECESSARY TO PROJECT 

 OBJECTS OF THESE SIZES. 



