New Table of Standard Wave-lengths. 



53 



Elements 



Si .... 

 Fe .... 

 Si .... 

 Fe .... 

 Si .... 

 Fe .... 

 Hg* . 

 Fe.... 

 Fe.... 

 Fe .... 

 Al .... 

 Al .... 

 Mn.... 

 Fe? . 

 Fe .... 

 Mn.... 

 Fe .... 

 Fe .... 

 Fe .... 

 Fe .... 

 i .... 

 Fe .... 

 Fe .... 

 Fe .... 

 Fe .... 

 Ca .... 

 Fe .... 

 Fe? . 

 Fe? \ 

 Fe .... 

 Fe .... 

 Fe .... 

 Fe .... 

 Fe .... 

 Fe .... 

 Fe .... 

 Fe .... 

 Mgt . 

 Fe .... 

 Mgt . 

 Mgt . 

 Mgt . 

 Fe.... 

 Mgt 

 Fe .... 

 Mn.... 

 Mg.... 

 Mn.... 

 Mn.... 

 Mg.... 

 Fe .... 

 Fe .... 



In Arc. 



Inten- 

 sity. 



9 

 10 



50 



10 



10 



20 



20 

 5 

 3 



Appear- 

 ance. 



In Sun. 



Inten 

 sity. 



Appear 

 ance. 



Kind 



of 



Stand 



ard. 



Weight, 



M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 

 M 



In 

 Arc 



10 

 3 



10 

 3 

 5 

 3 

 2 

 3 

 3 

 2 

 5 

 5 

 2 

 2 

 2 

 2 

 2 

 3 

 2 

 3 

 7 

 3 

 2 

 3 

 3 

 1 

 3 

 3 

 3 

 3 

 3 

 2 

 3 

 2 

 2 

 2 

 2 

 5 

 2 

 3 

 5 

 5 

 1 

 5 

 3 

 3 



12 

 3 

 3 



10 

 3 

 1 



In 



Sun 



Wave- 

 length 

 in Arc. 



2519-297 

 2522-948 

 2524-206 

 2527-530 

 2528-599 

 2535-699 

 2536-648 

 2541-058 

 2546068 

 2549704 

 2568-085 

 2575-198 

 2576195 

 2584-629 

 2585-963 

 2593-810 

 2598-460 

 2599-494 

 2611965 

 2631-125 

 2631392 

 2679-148 

 2706-684 

 2719-119 

 2720-989 

 2721-762 

 2723-668 

 2733-673 

 2737-405 

 2742-485 

 2750-237 

 2755-837 

 2756-427 

 2761-876 

 2762-110 

 2767-630 

 2772-206 

 2778-798 

 2778-340 

 2778-381 

 2779-935 

 2781-521 

 2781-945 

 2783-077 

 2788-201 

 2794-911 

 2795-632 

 2798-369 

 2801-183 

 2802-805 

 2813-388 

 2823-389 



Wave- 

 length 

 in Sun. 



* This line appears as a sharp reversal, with no shading, in the spectra of 

 all substances tried that contained any trace of Continuous spectrum in this 

 region. (J.) 



t A remarkable symmetrical group of five lines in the spectrum of 

 magnesium. 



