226 THE HISTOKY AND DEVELOPMENT OF THE MICROSCOPE 



are drawn together by a screw, which thus regulates the pressure 

 iii.-itle liy tin- two ridges that work into the two grooves on the limb. 

 When this pressure is moderate, nothing can be more satisfactory 

 than cither the smoothness of the inclining movement or the 

 balancing of the instrument in all positions; while, by a slight 



ls(l - Sv ed ' Wale's ' microscope (1881 and 1883). 



tightening of the screw, il can be tinnly fixed either horizontally, 



vertically, or at any inclination. The 'coarse' adjustment is made 



.1 smooth working rack: the line adjustment is Swift's patent 



on ].. 17L> (lig. I.",:.). ,-md the attachable mechanical stage of 



firm can be readily added (a> in fig. |so). l m t in the best and 



