52 



SIMPLE MICROSCOPES. 



four inches broad is attached on each side by hinges ; and the two 

 flaps are so shaped that, when folded together, one lies closely upon 

 the other, as shown at b, Fig. 29, whilst, when opened, as shown at 

 A, they give a firm support to the stage at a convenient height. At 

 the back of the Stage-plate is a round hole, through which a tubular 



Fig. 29. 



B 



Quekett's Dissecting Microscope, set up for use at a, and packed 

 together at b. 



Stem works vertically with a rack-and-pinion movement, carrying 

 at its summit the horizontal Arm for the magnifying powers ■ and 

 into the under-side of the stage-plate there screws a stem which 

 carries the Mirror-frame. From this frame the Mirror may be 

 removed, and its place supplied by a convex lens, which serves as a 

 Condenser for opaque objects, its stem being then fitted into a hole 

 in the stage, at one side or in front of its central perforation. The 

 instrument is usually furnished with three Magni6ers, namely, an 

 inch and a half -inch ordinary lenses, and a quarter-inch Coddington 



