587 



NOTES. 



An Old Non-Achromatic Simple Microscope. 



By Edward M. Nelson. 



This simple Microscope, fig. 143, consists of a triangular prismatic 

 limb, attached to a turned ornamental pillar by a compass joint ; 

 concentric with this compass joint is a slotted semicircular brass 

 plate with a clamping screw, to clamp the limb at any required 



Fig. 143. 



inclination. The pillar is fixed to a circular brass base resting on 

 three feet. 



The stage has a rectangular clip with two pins fastened below 

 it which pass through two holes in the stage. This form of stage 

 clip]first appeared in Jones' Most Improved Compound Microscope * 



* George Adams, ' Essays on the Microscope '; the date on Plate 4 is 1797. 



