130 



EXPLANATION OF PLATE XXVII. 



Fig. I. Represents the foundation-plate with the dovetailed or conical ring, it is 

 drawn in perspective to show how much the ring is raised that the adjust- 

 ing parts (or milled heads) may pass clearly when the stage is revolved. 



Fig. 2. The revolving-plate (which is fitted to the ring) upon which the movements 

 of the stage are adapted; upon it are fastened the dovetails (a) in which the 

 lateral motion works, and the screw (b) hy which it is moved. 



Fig. 3. The lateral sliding-plate ; the lower part forms a collar (c) in which the 

 screw of fig. 2 works, on the upper part is a pinion (d) by which the verti- 

 cal plate is moved up and down. 



Fig. 4. The vertical-plate upon which the object is placed. On the under side 

 is fixed a rack corresponding to the pinion in fig. 3, the upper side is 

 fitted with two clamps sliding in dovetailed grooves ; the inner parts 

 of the clamps are hollowed out to admit the light freely from the mirror 

 when the Lieberkuhn is in use. 

 (The extent of the lateral and vertical actions is about one inch each way). 



Fig. 5. A sketch of the stage in its finished state ; the arrow indicates the axis of 

 the body of the microscope ; a, the pin to carry the forceps ; ft, a knob for 

 turning the revolving-plate ; c, the ring immediately upon the foundation- 

 plate. 



