Rays of Positive Electricity. 

 Table of Secondary Radiation. 



239 



Electrical 

 atomic 

 weight. 



Sign of 

 charge. 



Gases in which they 

 are found. 



i 

 Retnai'ks. 



Nature of 

 radiation. 



i : 



+ and — 



All gases. Hydrogen atom, i 



Dissociation. 



1-4 



-j- and — : 



Generally faint ; brightest j 

 in hydrogen. 



(H 3 ) ±± ? 



>j 



2 



3 



-(- and — 



In helium at certain prps- 

 sures; also in certain 

 hydrocarbons. 



Especially bright in hy- 

 drogen ; not exception- 

 ally bright in hydro- 

 carbons. 



He_j__|_ in first 

 case, (H 2 )_(_ in 

 second. 



More likely to be 

 (H 3 )+ than 



C ±±±± 





6 



+ 



Especially bright in carbon 

 compounds. 



C + + 





7 



+ 



Found most frequently 

 when carbon compounds 

 are absent. 



N ++ ? 





12 



+ 



Found in helium ; gene- 

 rally the brightest line 

 of this class in that gas. 



(He) 3 + 



Combination.! 



16 



-j- and — 



In oxygen ; one of the 

 brightest lines on the 

 negative side. 



°± 





26 



-f and — 



In cyanogen ; also bright 

 on negative side. 



(CN) ± 





36 



+ 



In CH 4 . 



(C 3 ) + 





48 



+ 



In oxygen. 



(0 3 ) + faint. 





72-78 .. 

 96 



+ 



In most hydrocarbons; 

 also in CO, ON. 



In oxygen. 



(0,) + or 



(C fi H fi ) + 

 (0 6 ) + faint. 





100 



+ 



In mercury vapour. 



(Hg) + + 





200 



+ 



In mercury vapour. 



Hg+ 





800 



+ 



In mercury vapour. 



(Hg 4 )_|_ faint. 





to the molecule is exceedingly faint, while in others it is 

 much the brighter of the two. I have never detected rays 

 consisting of negatively charged molecules, while those due 

 to negatively charged atoms are invariably present unless 

 the pressure of the gas in the discharge-tube is exceedingly 

 low. 



Oxygen. 



The primary rays characteristic of oxygen have electric 

 atomic weights 16 and 32, and are due respectively to the 



