CH. IT] 



LABORATORY MICROSCOPES 



79 



Fig. j8. NacheVs Microscope, No. n (Franklin Laboratory Supply Co., Boston). 



This microscope has no joint for inclination, and no rack and pinion for coarse 

 adjustment. For coarse adjustment, the tube is pulled up and down with the hands. 

 This kind of coarse adjustment was much more common ten years ago than now. 

 (See also Fig. 82. ) 



