THE SIMPLE MICROSCOPES 



5 



STEINHEIL APLANATIC LENSES 



Steinheil aplanatic lenses (Fig. 5) consist of three or four 

 lenses cemented together. The combination is such that the 

 field is large, flat, and achromatic. These lenses are suitable 



Fig. 5. — Steinheil Aplanatic Lens 



for field, dissecting, and pocket use. When such lenses are 

 placed in simple holders, they make good dissecting microscopes. 



DISSECTING MICROSCOPE 



The dissecting microscope (Fig. 6) consists of a Steinheil 

 lens and an elaborate stand, a firm base, a pillar, a rack and 



Fig. 6. — Dissecting Microscope 



