340 



Mr. J. N. Lockyer. 



[Apr. 29, 



I now come to my own experiments. 



The tube to which I have already referred is shown in the diagram : 

 A and B are platinum wires for passing the spark inside the tube ; E is 

 a small tube into which carbon tetrachloride was introduced ; it was 

 drawn out to a long narrow orifice to prevent the rapid evaporation of 

 the liquid during the exhaustion of the tube. The tube was bent 

 upwards and a bulb blown at c in order that the spark might be 



examined with the tube end-on, as it is found that after the spark has 

 passed for some time a deposit is formed on the sides of the bulb 

 immediately surrounding the platinums, thus obstructing the light. 

 After a vacuum had been obtained the tube was allowed to remain on 

 the Sprengel for a long time, in order that the last traces of air might 

 be expelled by the slow evaporation of the liquid.. 



SPARK WITHOUT) 

 JAR IN C.CI4. J 



! §1111 



CARBON |\| 

 FLUTINCS 



The carbon tetrachloride was prepared by Dr. Hodgkinson, whc 

 very kindly supplied me with sufficient for my experiments. 



On passing the spark without the jar in this tube, the spectrum 

 observed consists of those sets of flutings which, according to Messrs. 



