tlie Echelon Spectroscope. 



399 



Fig. 10. — Green (5460) Line of Mercury. 



Single Order. Double Order. 



_, r 1 



Without Magnetism. 



| 



Viewed across the Lines of Force. 



Magnetic Field=6000 c.G.s. units. 



Magnetic Field =19,800 c.G.s. units. 



Viewed along the Lines of Force. 





Magnetic Field at Centre= 13,000 c.G.s. un't3. 



