EFFECT OF THE MAGNETIC FIELD UPON ENHANCED LINES. 



55 



Since the triplets appear to be representative, and as their magnitudes of separation can be handled 

 most readily, Table 9 is arranged to compare the values of AX/X- for enhanced and non-enhanced triplets. 

 Triplets whose separation was not measurable are omitted, as are some non-enhanced triplets of very- 

 large separation, larger than is shown by any enhanced lines. 



T.VBLE 9. Values of A\/\- for Enhanced and Non-Enhanced Triplets. 



On account of the small number of enhanced lines of iron, Table 9 serves to bring out little more than 

 the distribution of the values of AX/X-. More enhanced Hnes are available for titanium, and in the study 

 of these, two points are noteworthy: the absence of very small separations, and the disproportionately 

 large number of enhanced triplets giving values from 1.4 to 1.8. This range includes the normal triplet 

 at about 1.6, and the table shows that the separations of over half of the lines in question are close to 

 this value. This is due in part to a condition which appears to be the only respect in which the enhanced 

 lines are in a class by themselves as regards the Zeeman phenomenon. In the region from 3600 to 4600, 

 which is rich in enhanced lines for titanium, the strongest enhanced lines were selected, 22 in number. 

 These are lines showing a high degree of enhancement in the spark and are as a rule much stronger in 

 the spark than any of the lines characteristic of the arc. A short exposure with a strongly condensed 

 spark would show these lines almost alone. Of these 22 Hnes 17 are clear triplets; the remaining 5, with 

 one e.xception, the weakest in the list, are of more complex character, These Hnes, with their intensity on 

 the scale here used, their type of separation, and the values of AX/X- for the triplets, are given in Table 10. 



Table 10.- 



-Effect of the Magnetic Field upon the Stronger Enhanced 

 Lines of Titanium. 



The values of AX/X^ for the lines in Table 10 do not appear to be as closely related to the interval a 

 as is usual among a Hke number of triplets taken at random. The measurements are usually of high 

 weight, the photographs being made with self-induction in the spark circuit, and still there is a total 

 lack of normal triplets, the values of AX/X= being scattered rather uniformly from 1.3 to 2.1. The most 

 we can conclude is that for titanium the strongest enhanced lines tend toward the triplet type, but not 

 toward the simplest intervals of separation. When we extend the comparison to the weaker enhanced 

 Hnes, many of which are of considerable strength in the arc, a large variety of types appears, with none 

 predominating. 



