McCi-ELLAND AND M'Henry — Uncharged NucUi. 



28r 



the spark at different distances, the quantity of air per minute being 

 2,000 CCS. :— 



In another experiment, using a different quartz tube and a blast of air = 

 3,000 CCS. per minute, the following numbers were obtained : — 

 Initial uranium current, Ci = 236. 

 Final „ „ C, = 238. 



Z mms. spark distance- 



CURVE5 2 



5 mms spark diitance 



Uranium Current 



Volts 



20 fO 60 80 100 120 lUO l60 ISO 200 



In the latter experiment a current-voltage curve was obtained for each 

 distance of the spark, and also one when the spark was stopped, giving the 

 current due to the small ions alone. Curves 2 show the relative magnitude 

 of the currents at different voltages. All the curves have the same saturation 



