on the Emanation of Phosphorus. 



341 



obviate excessive absorption before discharging into the color 

 tube. 



In Table Y,the liters of dry air which have passed over the 

 phosphorus strips are given under L. The successive liters of 

 emanation per minute to produce the standard blue are given 

 in the third column (d V/dt) ; the fourth gives the current 

 (often estimated) when the emanation passes through the con- 

 denser at the fixed rate of *5 liter /min., selected for con- 

 venience. 



Table V.— Condensation producing activity of initial '-wet" and final "dry" 

 phosphorus emanation. Temperature 0=18°. dV/dt = '5 lit/min., s = 13, 



for condenser. 



Color, etc. 

 Insulation 

 Bl 

 Bl 



L 











6 



13 



20 



25 



dV/dt 

 

 1-70 

 1-60 



1-43 



1-40 



ds/dt 



100 

 15 



Bl 



Bl 

 Bl 

 Bl 

 Bl 

 Bl 



Bl 



Remarks. 

 Condenser discharged within 5 sec 



Condenser discharged within 10 sec 

 Current estimated. 

 Phosphorus " dry." Insulation 6 

 Ionization constant. $ /s ='21 



Another experiment. Grid scoured. Temperature 21° . 



Condenser discharged within 7 sec 



Nuclei insufficient to produce 

 opaque. 



Opaque now attained. Con- 

 denser discharged within 20 sec . 

 Current estimated. 



Insulation ds/dt = 1, nearly per- 

 fect. 



Ionization constant. sjs = '13 



15 



20 



115 



100 

 90 



103 

 90 

 90 



200 



27 



100 



The first part of Table V shows definitely that when the 

 currents are too large to be even estimated, the emanation 

 needed to produce the standard blue is larger than at the end 

 of the experiment, where the radial currents have fallen off to 

 their small fixed value. Thus the high conduction is without 

 nuclear condensing effect. 



In the second part of the table the volumes are nearly con- 

 stant except at the beginning, where it was found impossible to 

 obtain opaque or even full blue, whatever volume is passed 

 through the ionizer. The necessary number of nuclei was not 

 forthcoming. As in the preceding table, however, less than 

 ten liters of air are sufficient to dry the phosphorus into full 

 activity so far as the color is concerned, whereas the conduc- 

 tion still retains abnormally large values. 



Another reciprocal relation is shown on the table. dV/dt 

 here happens to be unusually large, so that the phosphorus is 



