356 



DR. W. M. HICKS: A CRITICAL STUDY OF SPECTRAL SERIES. 



m. 

 1. 



2. 



-(5) 2344-4 

 42642'IG 



(5) 3765-463 

 2654976 



179-43 



181-64 



AS. 



-(3) 2354'S 

 42462-67 



(2) 3739-88 

 26731-40 



75-60 



74-74 



3. (1) 2484-1 



40244'05 17910 



(22127) 

 (45179'SO) 179-50 



(2) 2473-1 



40423'IS 70-39 

 7559 



6. 



[2049-5] 

 [4877G74] 



(2204-0) 

 (45358-80) 



(2098'S) 

 (47681) 



[2042-2] 

 [48950-34] 



75-60 



-(1) 2358-5 



42387-07 



(9) 3729-450 

 26806'H 



(1) 2468-8 

 40493-54 

 (4049874) 



(2200-3) 

 (45434-40) 



[2038'S] 

 [4903T94] 



The observation errors for m = 1 and 3 are very considerable, since the measures 

 are only given to "1 A.U. and "05 A. produces about dn = "8. Consequently it is 

 possible only to obtain approximate values for v lt f 3 . On the other hand, for m = 2, 

 where we have very accurate measures, there must be some doubt about the allocation 

 of S 3 (2) because its intensity, 9, is so excessive in comparison with the 5, 2 of Sj 

 and S 2 , and the v l separation of 181 "64 is greater than observation errors on the lines 

 for m 1, 3 allow. The latter objection, however, can be set aside as it corresponds 

 to the excess v t observed in Kr and X diffuse sets and, as will be found later, in NeS. 

 In these cases i>i + i> 2 comes out to be normal. Here, however, the sum is about 

 1'35 too large, and with the S(l) separations the typical S 3 (2) would be at 

 2680479 or d\ = '18, probably of intensity 1, and so overshadowed by the strong 

 line in the list. As will be seen immediately, the linkages will show that this value 

 is preferable. The linkages will also show the probability of a line at 40498 for 

 S 3 (3). 



The three first Sj lines give the formula 



n = 51731-05-] 



'095901- 



0178781 3 



m 



For the determination of A 1; A 2 , the oun and the links, reliable values of v l and v 3 

 are required. We have seen that the values obtained from the observed sets of lines 

 are subject to large observational errors. Nevertheless that the true value of v l is 



