38^ Intelligence and Miscellaneous Articles. 



Wave-lengths of the Principal Emission-Rays of several 

 Incandescent Metallic Vapours. 



Wave-length. Potassium. 



77cn 



1098 I T . , . ir , 



1162 ^-^ mes ver J brilliant. 



1233J 



SODIUM. 



{Visible to the naked eye. 

 Capt. Abneyhas photographed this line and discovered 

 that it is double. 

 1142. 



870 > Steontium. 



961 | 

 1003 )>Lines and bands feebler ; approximate wave-lengths. 

 1031 I 

 1098 J 



Calcium. 



qqqqqq r Broad bands, probably groups of lines. 



Magnesium. 

 899 1 Very intense, perhaps compound. 

 1047 (?) J Very feeble. 



1200. Broad and perhaps double. I This group resembles 

 1212 J group b. 



Aluminium. 



-jo^-i.c [ Broad and intense, perhaps compound. 



SS} 



1050. Cadmium. 



1059-8 I Lead. 



1087 \ Very intense. 



1133 J 



1221 I Feebler group. 



1229 J Approximate wave-length. 



Thallium. ■ 

 1150. Approximate wave-length. 



Bismuth. 

 q7 o [ Approximate wave-lengths. 



Silver. 



771 1 



825 I Visible *° tne na ^ed eye. 



1083 I t™ 



1199 [ TlN ' 



