

Fig. 9. Zeeman Doublet Photographed in Laboratory Spectrum. The 

 middle section shows the doublet. The adjacent sections indicate the appear- 

 ance of the spectrum line in the absence of a magnetic Held. 





■V 9 



1 



t~"iP? 



Fig. 10. a, b, spectra of two sun-spots. The 

 triple line indicates a magnetic field of 4500 

 gausses in a, and one of 2900 gausses in b. 



