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THE SIMPLE MICROSCOPES 
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 
Fic. 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 
Fic. 6.—Dissecting Microscope 
