140 



MICRO-SPECTROSCOPE AND POLARISCOPE \_CH. VI 



for the ocular micrometer ( 172). If one now uses daylight there 

 will be seen in the spectrum the dark Fraunhofer lines (Fig. 121 E. F., 

 etc.). 



FIG. 123. FIG. 124. FIG. 125. 



FIG. 123. (i). Section of the tube and stage of the microscope with the spectral 

 ocular or micro-spectroscope in position. 



Amid Prism (\ 188). The direct vision prism of Amid in which the central 

 shaded pi ism of flint glass gives the dispersion or separation into colors, luhile the 



