P. ZEEMAN. The intensities of the components of spectral lines 

 divided by magnetism. 



1. No quartz plate in front of 

 slit. 



2. Quartz plate, rotating plane of 

 polarization 45° in front 

 of slit. 

 Intensities as in source. 



3. Quartz plate, rotating plane of 

 polarization 90° in front 

 of slit. 



Proceedings Royal Acad. Amsterdam. Vol. X. 



