PHYSICS: D. L. WEBSTER 
93 
nearly as one can tell, from the critical potential to the limit of the bat- 
tery's capacity, at about 42 kv. The ratio of the jS line to the a doublet 
can be estimated only by allowing for the general radiation that appears 
in the spectrometer with each of them. This can be done, only roughly, 
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Fig. 3 
by the use of the intensity-potential graphs for the combined lines and 
general radiation and the comparison of them with the graphs for the 
general radiation at neighboring points in the spectrum. The resulting 
graphs, for the Hues alone, and the graph of their ratio against potential, 
are shown in figure 2. The constant ratio indicated there differs from 
