4870-6 

 4559-4 

 3917-0 

 3890-5 

 3885-9 

 3627-8 



^2419 -8 



The only lines that certainly remain not accounted for, leaving aside those where the coincidence is not very satisfactory, are : 



2 

 2 

 9 

 9 



2 



: IS an argon line at 4933-4 stronger in the blue spectrum seen on our own plates, but not mentioned by Kayser nor by Crookes. Crookes gives 4^38 

 int. 10 as a line of the blue spectrum of argon. But as there is no strong line at 4938, we are inclined to think that it is meant to be 4933. b The 

 deviation is too great to suggest the argon line 4879 (Crookes), though its intensity is about the same as that of 4848, and would therefore suit very 

 well, c Schuster has also measured these lines, and gives them, together with 4879 and 4726, as characteristic argon lines of the spectrum at 

 atmospheric pressure, d H. F. Newall, experimenting with one of our vacuum tubes filled with cleveite gas, found that these five lines appeared 

 in the periphery when it was put into a coil through which the discharge of a Leyden jar passed. We could not detect the lines on photographs 

 taken with an induction current passing through the tube in the ordinary way. e Coincidence very uncertain. / H. F. Newall gives a line 

 ^918-8 int. 5,* but at this place there is no argon line on our photographs, g Coincidence doubtful, h Coincidence doubtful, z We see a line 

 in the blue spectrum of argon at 3248-4 on our plates. 72536-65 strong mercury line. /4 2478-66 strong carbon line. / 2446-96 mercury line, 



intensity 6. 



NO. 1368, VOL. 53] 



A strophy deal Journal, May 1895. 



