THE SIMPLE MICROSCOPE. 

 3 



51 



Fig. 35. 



Fig. 36, is a back view of the instrument, arranged for use. 

 The stage, h, is screwed into the top of the box, and is raised 

 one inch above it, by means of a tube, in which it is made to 



Fig. 36. 



revolve, so that an object placed on it may be turned into any 

 convenient position. The apparatus for carrying the lenses 

 and for the adjustment of the same, is represented as it is 

 attached to the back of the case. A vertical stem, six inches 

 long and four-tenths square, with a rack on one side, carries 

 the lens holder, m n, which may be moved backwards and 

 forwards by a rack and pinion at m., and is made to turn hori- 



