TYPES OF SEPARATION. 



The number of lines for each type of separation, including both the clear and the doubtful cases, is 

 given in Table 3. For the quadruplets, sextuplets, and septuplets, the questioned lines greatly out- 

 number the clear cases. For example, iron shows only two clear septuplets and titanium two clear quad- 

 ruplets. A strong field will probably show that these doubtful lines have usually been correctly classi- 

 fied as to number of components, but actual measurements for the unresolved components are at present 

 lacking. 



Table 3. Summary of Types of Separation. 



I. Unaffected Lines. 



A number of fines in each spectrum show no tendency toward separation or even widening by a 

 magnetic field as high as 20,000 gausses. The fight giving such fines is unpolarized so that a single 

 sharp line appears in the magnetic field spectrum, whatever the optical system may be. 

 ber of these fines is not large, the undoubted cases being as herewith: 



The num- 



2. Triplets. 



The number of triplets is larger than that of any other one type, the number of clear cases, i.e., those 

 whose components show no widening which would indicate that they are compound, being 297 for iron 

 and 247 for titanium. The relation of the separation of these to the "normal interval" will be treated 

 in another part of this paper. 



A rather curious mistake has found its way into the literature based on some lines in the iron spec- 

 trum. Becquerel and Deslandres in their first pubfication (g) gave X3865.674 as an "inverted triplet," 

 having but a single ^-component and two /(-components. This evidently arose from under-e.xposure of their 

 photographs for the w-component, as in their next paper (10) they gave the correct character of this fine, 

 44 



