TABLE 312. 

 WAVE-LENGTHS OF FRAUNHOFER LINES. 



265 



For convenience of reference the values of the wave-lengths corresponding to the Fraunhofer 

 lines usually designated by the letters in the column headed " index letters," are here tabulated 

 separately. The values are in ten millionths of a millimeter, on the supposition that the D line 

 value is 5896.155. The table is for the most part taken from Rowland's table of standard wave- 

 lengths. 



* The two lines here given for A are stated by Rowland to be: the first, a line " beginning at the 

 head of A, outside edge"; the second, a "single line beginning at the tail of A." 



t The principal line in the head of B. 



$ Chief line in the a group. 



See Table 321, Rowland's Solar Wave-lengths (foot of page) for correction to reduce these values 

 to standard system of wave-lengths, Table 314. 



SMITHSONIAN TABLCB. 



