294 



REPORT — 1895. 



Table of Standard Wave-lengths — continved. 



ExPLANATOET NoTE. — The first column gives the symbol of the element -n-hose 

 ■wave-length has been measured, e.^. O signifies oxygen, -wv -water-vapour, &c. If a 

 letter stands at the left within brackets : thus, [A] [C], it is the ' name ' of the line 

 in the solar spectrum. A mark of interrogation after the symbol means that it is 

 doubtful if the line is really due to that element. Two symbols on the same line 

 {e.g. Mn Di, 3295957) signify that these two elements have apparently coincident 



Two or more symbols bracketed {e.g. Si J> 3260-384) 



lines as their wave-length. 



Fe / 



mean that the first has a line coinciding with one side of the corresponding solar 

 line, the second with tlie middle, &c. A mark of interrogation alone signifies that 

 the chemical origin of the line is unknown. The fifth and sixth columns give the 

 ' weights ' to be attached to the lines as standards in the arc and solar spectrum 

 respectively. The fourth column gives the character of the standard. M. means a 

 standard in the arc spectrum ; I. a remarkably good standard in the solar spectrum ; 

 II. a good solar standard ; III. an ordinary solar standard ; and IV. a rather poor solar 

 standard. Columns 7 and 8 give the wave-lengths in air at about 20° C. and 760 mm. 

 Lines marked with two dashes are double : thus 6". r signifies reversed. 



