172 



HOW TO SEE WITH THE MICROSCOPE. 



to use either angle. It can at will be raised or lowered^ 

 or clamped in any desired position. 



B 



a. Vertical viw. 



b. Sectional view. 



c. Prism three-fourths full size. 



In the adaptation of this useful accessory to the acme- 

 stand Mr. Sidle has been singularly fortunate. 



This neat and compact little device screws, as I 

 have had occasion, on a previous page, to state, into the 

 well-hole of the acme stage. It is thus " on and off'* 



