Physics. — "A Relation belmeen the Spectra of Ionized Potassium 

 and Argon." (Second Communication). By H. W. J. Dik and 

 Prof. P. Zeeman. 



iComiTiuDicated at the meeting of June 30, 1923). 



The observations of tlie spectiiim of potassium vaponr under the 

 intlnence of tiie disciiarge witliout electrodes liave now l)een coni- 



o 



pleted. Tiiese measurements go up lo /. 2342,3 A. The}, too, iiave 

 been made with a quartz spectrograph. We i)egin Table IV with 

 3514.0, so tliat Table I of our first communication') and Table IV 

 for a small pari overlap. The values of Table IV are more accurate, 

 and have been obtained bj direct comparison with the standard 

 iron lines. 



1) These Proceedings, Vol. XXV, p. 67. 



