Lever Fine-adjustment. By E. B. Stringer. 



295 



the present simple arrangement — which Messrs. Baker have made 

 to ray design — is to reverse these conditions (fig. 53). 



A strong pin of hard steel rests upon the lever, and, passing up 

 through an intervening guide, in which it closely fits, projects 

 slightly beyond the upper end of the limb. Upon the upper end 

 of this pin a small bracket attached to the body rests. Now when 

 the lever rises, its movement is transmitted to the bracket at the 



C.BAKER. UOrfOON, 



Fig. 54. 



top, any possible lateral movement of the lever being taken up by 

 the guide. 



The opposing spring is situated below the guide, and is com- 

 pressed against it by a small lug attached to the body, through 

 which the pin passes freely, and against which the spring bears 

 downwards. Thus the lever and the spring oppose each other at 

 the two extreme points of the movement, the lever acting at the 

 top, and the spring at the bottom ; and (as in the usual form) 

 the cover-glass cannot be broken except by the pressure of the 

 spring, wdiich may be made so light as to render this impossible. 



A two-speed movement is provided by milling the projecting 

 rim on the upper surface of the screw-head. When the finger rests 



