THE COMPOUND MICROSCOPE. 



63 



upper part of the instrument turns, so as to enable it to 

 take a horizontal or vertical position, or any intermediate 

 inclination, such, for instance, as that shown in the draw- 

 ing. This movable part is fixed to the axis near its 

 centre of gravity, and consists of the stage, the arm 

 screwed into the triangular bar which carries the micro- 

 scope tube or body, at the upper end of this is the eye- 

 piece, and at the lower the object-glasses. The stage has 



Fig. 37. Baker's Student's Microscope. 



rectangular movements one inch in extent on the racket- 

 cylinders, moved by the pinions connected with the milled- 

 heads. The triangular bar, together with the arm and 



