680 



Mr. ID lis Hjaimar on 



The deviations in Table IV. are very small. Most of them 

 lie within the limits of the experimental errors. The lattice 

 constant may accordingly be more exactly determined from 

 these measurements than from Table III. The results of 

 the calculations about this are given in Table VII. 







Table VII. 





Line. 





*!•»■ 



X C X.U. 



log 2d. 



Vaft... 



.. 8° 



39' 8"-3 



2279-68 



1-1805169 



Ti ft ... 



.. 9 



31 43 "2 



2508-74 



5500 



Baft ... 



.. 9 



44 7 -1 



2562-35 



5031 



Sc ft ... 



.. 10 



32 49 -0 



2773-66 



5047 



Oaft... 



.. 11 



44 10 -2 



3082-97 



6069 



■K ft ... 



.. 13 



8 37 -1 



3446-38 



5861 



Agft .... 



.. 15 



56 -3 



3926-56 



5739 



CI ft ... 



.. 16 



51 13 -0 



4394-50 



6157 



Mo/3, ... 



.. 19 



55 48 -0 



5166-44 



6003 



Thus, as a definite value, we get 



log 2d = 1-1805620 -8(± 0-0000149). 



On looking at Table IV. one will be at once astonished at 

 the change in the sign of S\ at Ca. But from what has been 

 said above it is evident that the importance of this must 

 not be over-rated. It will seem as if the measurements above 

 Ca (\>3'1A.U.) will give too small values of the wave- 

 lengths, but as the deviations are very small ( < 0*01 per cent, 

 of X), no corrections may be made. In the second and third 

 orders the deviations are larger, exactly as it was established 

 by Stenstrom. 



The results of the investigations in the domain S — Na are 

 collected in Tables VII1.-XIII. Here I have discovered* 





Table VIII 







Table IX. 





S. 









P. 



jine. 



\ g X.U. 





V 



R ' 



Line. 



X 9 XX\ £. 



a x .... 



. 5360-66 





169-99 



"i •••• 



.. 6141-71 148-37 



«/.... 



.. visible, not 



measurable. 



< ■■■■ 



.. visible, not measurable. 



tr 3 



.. 5328-33 





17L02 



«3 •••• 



.. 6102-19 149-33 



«4 ••• 



.. 5321-75 





171-23 



«4 ••• 



.. 6095-00 149-51 



(«5 a e)- 



.. 5277 





172-68 



ft . .. 



.. 5820-40 156-56 



ft, •••■ 



.. 5047 





180-55 



ft .... 



.. visible, not measurable 



ft .... 



.. 5019-13 





181-55 



ft .... 



.. 5785-13 157 51 



* In a pbotogram of Ca they could also be observed. 



