THIRD-CLASS AMERICAN MICROSCOPES 223 



firm can be added. The sub-stage is the new and complete one of 

 the umker.s, arranged for doing critical work ; the fine adjustment 



FIG. 178.\. Eeichert's 'Austrian' Baugh stand (1899). 



is by micrometer screw ; the weight of the body is balanced, the 

 makers tell us, by a spiral spring which, they believe, subjects the fine 



