222 



THE MICEOSCOPE. 



[November, 



and a spring above presses down against this shoulder, insuring 

 its continuous contact vs' ith the lever during adjustments. All the 

 mechanism is concealed w^ithin the arm, w^hich is so hollowed as 

 to secure both lightness and greater rigidity. This fine adjustment 

 is free from lateral motion, and exceedingly sensitive. Its con- 



Zentmayer's American-Continental Microscope. 



struction prevents wear, and is so positive that a revolving nose- 

 piece and attached objectives can be easily carried without injury. 

 It also acts as a safety appliance in case an objective is accident- 

 ally racked down against an object, for the spring yields quickly 

 to upward pressure. The body-tube is five and one-half inches 



