26 



THE MICROSCOPIST. 



densing glass. It was afterwards improved by the addition of 

 a handle placed at right angles to its body. 



The best form of the simple microscope for viewing opaque 



Fig. 4. 



objects, is that represented by Fig. 4 : a is a flat piece of brass 

 attached to the handle, p', it supports the lens-holder, i t and 

 through it passes the screw, &, which is connected to the back- 

 plate, c ; a spring, e, keeps the plates, a, c, apart, and the nut, 



