I 



86 



EXPERIMENTS WITH lONlZKU All:. 



HeiR-e, very near the surface, h = A'{r - R)/r-\-C\(l V/dt){r — Rf/HneaRr. 

 As ill the iireceding simpler instance tlie discussion of this case would be cuiul)er- 

 scuut; and out of line with the present mode of investit;ation. As neither case in 

 the light of the observations is suggestive, I shall here abandon both. 



CIKRKNTS IN COXDENSEKS FOR SUCCPISSIVKLV V.MiYING I'OTENTIAI, DIl'l'EKENC'KS AND 



FIXED ItADII. 



11. x\]>puratuii and observations. — One important question as to the availability 

 of phosphorus as an ion [jroducer is the intensity of its action, or the number of ions 



•OOi 



0015 



■0010 



10 20 30 



10 20 30 4.0 50 60 70 80 .qo 



Firs. 3 to 15.— Charts Showing Successive Electrometer Deflectio.ns (s), and their Derivatives, 

 IN the Lai'se of Time (/), for Different Radii {K) of the Condensers. Kni=zJfd{\ogV)lilt. 



produced per second in limiting cases. To make an estimate of this quality it suf- 

 fices to pass a current through the spherical condenser for gradually increasing 

 potential differences between the faces, in order to ascertain to what degree the 

 phenomenon fails to obey Ohm's law. In proportion as the numl)er of ions is 

 smaller relatively to the current transferred, the latter will fall short of its normal 

 value. It will reach a constant limit when all ions present are used as carriers of 

 electricity. 



