116 



DR L. BECKER ON THE SOLAR SPECTRUM. 



been observed on fewer occasions, it was found inadmissible to take the mean values of 

 the wave-lengths before the single determinations had been corrected for systematic 

 deviations derived from the darker lines. 



As the observations of the standard lines were reduced with the others, the wave- 

 lengths thus obtained should not deviate far from the standard values adopted. How- 

 ever, we must not forget that the curve was drawn as regularly as possible, and therefore 

 at places where two or more standard lines lie close together discrepancies must occur in 

 the several determinations of the wave-lengths of the standard lines. In the following 

 table we give a comparison of the wave-lengths determined by Professor Eowland and 

 by Drs Muller and Kempf with the mean of our final values. The Potsdam wave- 

 lengths, which served as standards, are marked by a star in the column MK-B. Double 

 lines have a d affixed. 



Table II. 



Final 

 Wave-Lengths. 



R-B 



MK-B 



6024-22 



- 1 



+ 16 



6021-94 



+ 1 





6020-23c? 



+ 5 





6016-81 



-3 





6013-68 







+ 15 



6008-71 



-1 





6003-17 







+ 16 



5987-20 



+ 1 



+ 20 



5984-90 1 



+ 8 





5976-94 



_ i 



+ 17 



5975-51 









5965-97 





+ 15 



5958-45 





+ 10 



5956-86 



-1 





5955-10 



+ 1 





5951-68 



+ 3 





5948-67 



+ 1 



+ 26 



5946-14 



-1 





5934-82 



-1 



+ 17 



5930-33 



+ 1 





5919-83 



-4 





5916-42 



-1 





5914-32<2 







+ 15 



5905-81 



+ 1 





5901-62 



+ 1 





5898-33 









5896-08 







+ 17 



5893-08 2 



-5 





5890-12 







+ 11 



5889-78 



+ 2 





5883-98^ 



-1 



+ 21 



5862-51 







+ 15 



5859-73 



+ 1 





5857-61 







+ 19 



5853-85 



-1 





Final 

 Wave-Lengths. 



R-B 



MK-B 



5848-36 





+ 16* 



5831-81 





+ 15* 



5816-50 







+ 18 



5809-35 



+ 1 





5806-89 





+ 16* 



5798-36 



-3 





5791-14 







+ 16 



5788-09 



-2 





5784-02 



-1 





5782-30 



- 2 





5780-72 





+ 18 



5775-24 



-1 



+ 12 



5772-28 



+ 2 





5763-15 







+ *8 



5754-82 







+ 8 



5753-29 



-1 





5752-21 



- 2 





5748-12 





+ "7 



5741-97 



+ 2 





5731-92 



-1 



+ 15 



5718-00 





+ 13 



5715-25 



-i 





5709-71 

 5709-55 



-i 



+ i 



1 +12 



5701-71 









5698-57^ 





+ 13 



5688-38 



-i 



+ 13 



5682-84 3 

 5682-41 



+ 5 



1 +17 



5679-21 



-3 





5675-59 







+ 17 



5662-68 









5659-04 





) 



5658-82 





)■ +13 



5658-65 





1 



Final 

 Wave-Lengths. 



R-B 



5657-99 



+ 3 



5655-70* 



-6 



5645-76 



-1 



5644-31 





5644-13 





5641-58 



+ 1 



5638-39 





5634-02 





5624-70 







5624-18 







5615-82 



-1 



5615-44 



+ 1 



5603-03^ 



-1 



5594-87 





5594-66 5 





5588-92 



-1 



5586-90 





5582-12 







5578-82 





5576-22 







5572-98 





5569-76 



+ 1 



5565-83 





5555-05 



-1 



5544-07 







5543-34 







5534-98 



+ 1 



5528-56 







5514 - 57<2 





5513-12 







5506-92 







5501-58 



+ 3 



5497-68 



- 2 



5487-88 





5477-05 



-1 



MK-B 



} +5 



+ 19 



+ 18 

 + 5 



J- +22 

 + 12 



}♦_• 



+ 14 



+ 19 



+ 16 



+ 16 

 + 12 



+ 10 



+ 12 



+ 18 



+ 21 

 + 15 

 + 19 



1 Telluric companion. 2 Telluric companion. 3 Telluric companion. 



4 Another line to the violet side. ° Another lino to the violet side. 



