Morrow — On the Influence of Self-induction, Sfc. 



617 



Sulphur. 



Some sulphur was placed in the small quartz flask aud vapourized. 

 Then the current was passed, and the spectrum photographed. Many 

 lines appear which are chiefly in the visible region, but there are some 

 as far as X 3356*5. Self-induction causes all the sulphur lines to disappear 

 when sulphur-vapour is used. 



Sulphur dioxide and sulphuretted hydrogen both show all the lines 

 obtained with sulphur alone, and with sulphur dioxide a fairly strong 

 line X 4486 appears, which is not seen with sulphur. The current did 

 not pass easily when the atmosphere was sulphur dioxide, but the sulphur 

 lines come out very strongly in the photograph, together with oxygen lines. 

 A few sulphur lines still show when self-induction is introduced with sulphur 

 dioxide, though these lines are not seen with sulphur alone. 



The current passed easily with sulphuretted hydrogen, but the sulphur 

 lines do not show so strongly as with sulphur dioxide ; the hydrogen lines 

 are more prominent. The hydrogen apparently conveyed the current 

 easily across the spark-gap as it did with pure hydrogen, to the exclusion 

 of a great part of the sulphur. 



Principal Lines of Sulphur. 



* Seen with SO2 only. 



4y2 



