MICROSCOPY 



85 



mounted on a strong supporting arm (F), which also serves as a handle. 

 The body tube is moved upward or downward by a coarse (G) and a 

 fine (H) focal adjustment in order to bring the object to focus at the eye 

 point. Most microscopes have two, three, or four interchangeable objec- 

 tives, all mounted on a revolving nosepiece (/). The slide and object 

 may be moved about by a mechanical stage (K). 



(b) 



Fig. 8-1. A typical comp>ound microsope. For explanation of 

 labels, see text. (Courtesy Bausch and Lomb Optical Company.) 



To the conservative old timer, some of the newer models hardly look 

 like microscopes. Figure 8-2 shows the Leitz Labolux Ilia. The body tube 

 contains a set of prisms arranged to form the image at the eyepiece, as in 

 the conventional microscope. The prism system, however, permits the 

 tilting of the eyepiece for greater comfort and even allows the upper 



