410 
PHYSICS: ANSLOW AND HOWELL 
10 
Lois. \at. no. 
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11 
/.9 
A/ 
line through these three elements showed that the frequency difference 
of radium triplets should be approximately 3060. An examination of 
the known radium lines, measured by Runge and Precht,^ showd a num- 
ber of triplets with the average frequency differences, n = 2016.64; 
f2 = 1036.15; and vx -\- = 3052.79. Two triplets showed well marked 
satellites and seemed to belong definitely to the first subordinate series. 
Although a study of the magnetic resolution of these lines will be neces- 
