MICROMETRY MICROMETRIC MICROSCOPES 



177 



moved independently by means of the micrometer screw M 1 , 

 thus permitting a very exact adjustment of a point or line under 

 the cross-hairs of the microscope B. At the opposite end of the 



D' 



M 1 



FIG. 112. Zeiss Traversing Microscope or Comparator. 



stage a second micrometer screw M 2 displaces the entire stage. 

 The section s 2 carries a finely graduated scale whose rulings 

 are read by the reading microscope A of fixed focus. Each 

 microscope is provided with a fixed ocular with cross-hairs mov- 



