INVESTIGATIONS OF MOLL. 



77 



the region from 2 to 4 /i he succeeded in resolving the emission into sepa- 

 rate bands, which the writer, from the smallness of the deflections and the 

 limited number of observations, recorded as a continuous spectrum. He 

 found the C0 2 band at 4.44 n when he used the salts in the arc, and also 

 for various kinds of carbon electrodes. His energy curves for sodium and 

 for potassium are given in figs. 53 and 54, respectively, in which the reso- 

 lution of the energy in the region of 1.5 to 4 y. into separate bands is well 

 illustrated. The automatic apparatus succeeded in doing what physical 



180 



n 



240 



n 



100 



90 



80 



70 



60 



3"> 



'to 

 C50 

 a) 



40 



30 



20 



10 



1 80 



n 



25 



4 5 



C0 2 



I I I I 1 I I'l t I 'I I I'l ]' II I I I I'! ' J 



I.54Q 1.535 1-530 I.5ZS 1. 520 



A 



T 



i r 

 1.5 2 



0.75 / 1.5 2 3 



Fig. 53. Emission of sodium (Moll). 



-I 

 4/1 



endurance would hardly permit, in mapping this region. No curves are 

 published for the carbon electrodes, but considerable comment is made on 

 the fact that in every case he observed an emission band of C0 2 , while 

 the present writer did not find the band, except when using salts in the 

 arc. From the aforesaid observations on the radiation from graphite, it is 

 evident that the conditions were different in the two cases. The writer 

 had observed the same phenomena as did Moll, who, in his comments, 

 missed the point emphasized by me, viz, that whether or not the spec- 

 trum at 2 to 4 ; is a complex of small emission bands, the emission bands 

 of the alkali metals at 0.76 to 1// are the most intense in the whole spec- 



