10 



KENT AND TAYLOR. 



(6) The structure given by both echelons is the same. That is, 

 there are five secondary maxima for every primary maximum. Ag for 

 Hydrogen X6563 is 0.061 t. m. for instrument No. 2, while for No. 1 

 it is about 0.096 t. m., which again is another fact fatally inconsistent 

 with the existence of a definite discontinuous emission in the source. 



With this evidence at hand the writers then attempted to clear up 

 the results of the crossed dispersions. The source previously used was 

 hardly adequate. By removing the soft core of the lower carbon it 

 was possible to feed copiously into the arc a strong LiCl solution. 

 Greater brilliancy and steadiness were obtained. The results were 

 unmistakably in accord with the facts given in (1) to (6) above. 

 Figures 6a and 6b indicate the structure observed. These will be 



Fig. 6a. 



Fig. 6b. 



Figure 6a. Li X6104 with crossed Lummer plate and echelon. Grid not 

 indicated. Xi and X2 in single and double order condition respectively. 



Figure 6b. Li X6104 as in Fig. 6a. Grid shown. Xi and X2 both between 

 single and double order condition. 



discussed in full below (see page 16). When one component of the 

 spectroscopic doublet is in double and the other in single order condi- 

 tion three lines appear; when both are in a condition between single 



