CH. II] 



LA BORA TOR V MICROSCOPES. 



77 



Fig. 82. Leitz' Demonstration Microscope. 7 his is designed for class demon- 

 stration and is pointed toward the window, or some other source of light, by the 

 student. It has an arrangement for holding a sketch of the object tinder the 

 microscope. 



Fig. 83. Leitz' Microscope, 

 Xo. IV, with sliding tube for 

 coarse adjustment, and no joint 

 for inclination. This micro- 

 scope must always be used in the 

 vertical position. Microscopes 

 of this form are not so much the 

 fashion as they were a few years 

 ago. If any instrument re- 

 quires mechanical aids to en- 

 able one to attain a desired re- 

 sult with ease and certainty, it 

 is a microscope. 



Most of the Leitz microscopes 

 are now supplied with joint and 

 with rack and pinion for the 

 coarse adjustment [Fig. j6). 



Sf^gl 



