582 
MR, J. NORMAN LOCKYER ON THE 
Fig. 10. 
Chromosphere and prominences depicted in the K radiation of calcium. 
Forms in Different Radiations. 
Rings corresponding to various radiations can be isolated in the way indicated, 
and compared with each other. This has been done for and, so far as it goes, 
it resembles the K ring, but some of the prominences depicted by K are not shown 
in light. In the case of the metallic prominences, the images formed by the 
hydrogen radiations very closely resemble those formed by H and K, but they do 
not reach to so great a height. In the case of large prominences, such as that near 
the south pole, the hydrogen images are feeble and show only very small parts of 
those depicted in H and K light, although IT and K are quite as intense as in the 
metallic prominences- 
The images produced by the radiations of helium are similar to those given by 
hydrogen, but they are smaller and less intense. 
Effects o f Movement. 
The forms of monochromatic images of the prominences may be produced in part 
by the movement in the line of sight of the vapours which give rise to them. 
Regions in which the vapours are approaching the earth will be displaced to the 
