TOLLES LARGE " BB" MICROSCOPE. 



TOLLES' LARGE "BB" MICROSCOPE. 



This instrument was designed to meet the require- 

 ments of the scientific investigator. The instrument,. 



constructed on the Jackson model, is eighteen inches 

 high, when placed in a vertical position, and weighs 

 about fourteen pounds. The curved arm is supported 

 on a steel trunnion between two strong brass pillars 



