86 



THE MICROSCOPE. 



any intermediate position — such, for instance, as that 

 shown in the drawing. This moveable part is fixed to 

 the axis near the centre of gravity, and consists of the 

 stage and the arm screwed into the square bar which 



Fig. 42. — Baker's bo. 1 vunc^oaaa Mvcrvawpt. 



carries the tube or body, with object-glass screwed into 

 its place. The upper or table- stage has rectangular rack- 

 and-pinion movements, working one inch in each direction. 

 A circular and sliding motion is also given to the top plate. 



