336 C. Barus — Effect of Temperature and of Moisture 



Table III. —Radial currents in the condenser. Phosphorus ionizer at different 



temperatures. 



E = 41 volts. 



so = 73. 



6, etc. d 1 



V/dt 



ds/dt 



So/So 



Insulation 



•00 



. 3'6 



•05 



14-0° 



48 



— 5-5 



+ •07 



14-0 



49 



— 6-0 



— •08 



16-4 



48 



+ 13-3 



+ •18 



16-4 



48 



— 14-0 



— •19 



19-8 



48 



+ 18'0 



+ •25 



J9-8 



48 



— 18-0 



— •25 



22-8 



48 



+ 16/5 



+ •23 



22-8 



48 



— 17-0 



— •23 



26-6 



48 



4-15-5 



+ •21 



26-5 



47 



— 150 



— •21 



30*7 



48 



+ 13-8 



+ •19 



30-7 



47 



— 145 



— •20 



34-9 



48 



+ 12-8 



+ •18 



34-8 



48 



— 13-0 



— •18 



above, a circumstance presently to be considered and attribut- 

 able to moisture and leakage errors, or in general to the neces- 

 sarily unsaturated condition of the ionization within the 

 condenser. 



Moreover the form of figure 7 differs from figure 6 and has 

 approached more nearly to the color results of figure 4. The 

 maximum, however, is still near 20°, so that the inferences 

 above on the earlier appearance of the nuclei, is sustained. 



15. Permanent conduction produced by the emanation. — 

 At this stage of my work, I encountered a peculiar and puz- 

 zling series of phenomena which were not noticed in my earlier 

 work, probably because the room temperature was purposely 

 kept high and the atmosphere dry. After the air was passed 

 over phosphorus freshly put into the tube ab, figure 1, the 

 condenser receiving the emanation was thereafter found to 

 remain permanently conducting even with the air current shut 

 off, precisely as though it had itself become radio-active. This 

 conduction was relatively so enormous that the electric cur- 

 rents could not be measured by the same electrometer and the 

 occurrence of an internal metallic contact or break in the insu- 

 lation was immediately suggested. I, therefore, overhauled 

 the condenser carefully, inserted an internal bushing, replaced 

 the internal rod by a new one, etc., all without effect. The 

 condenser showed good insulation after putting; it together, 

 but became a conductor after the passage of the first phos- 



