OF ARTS AND SCIENCES. 



101 



The following are the unreduced measurements of the principal 

 lines in the B group: — 



B a 



B B\ q 



B 2 



B s 



B, 



Bs 



B 6 



B, 



B a 



Bio 

 B n 



B \2 



Sharp line, 

 Centre faint pair, 



Delicate pair, < !„: 



Faint line, 

 Faint line, 

 Very faint line, 

 Strong line, 

 Strong line, 

 End of group, 



16.379 



15.131 



14.749 



( 14.559 ) 



\ 14.468 J 



I 14.243 | 



\ 14.139 ( 



( 13.896 i 



\ 13.818 J 



' 13.549 i 



13.454 | 



13.162 ) 



13.067 | 



< 12.741 ( 



\ 12.652 | 



12.322 



12.216 



11.849 



11.760 



11.725 



11.404 



11.315 



10.909 



10.836 



10.292 



9.890 

 9.451 

 9.307 

 9.253 

 9.049 

 8.883 

 8.735 

 8.516 

 7.600 

 7.141 



6.537 



8.172 



8.367 



8.440 



8.662 



8.758 



8.997 



9.100 



9.369 



9.455 



9.746 



9.854 



10.164 



10.265 



10.584 



10.650 



11.076 

 11.150 



11.522 

 11.628 

 12.012 

 12.100 

 12.624 



6.529 



8.168 



8.340 



8.436 



8.666 



8.764 



8.997 



9.117 



9.350 



9.450 



9.711 



9.820 



10.150 



10.228 



10.559 



10.664 



11.065 

 11.140 



11.528 

 11.596 

 12.010 

 12.085 

 12.616 



The following are the remainders left after subtracting the microm- 

 eter reading of the line called B from the readings of the other 

 lines in the B a band : — 



