74 CONDENSATION OF VAPOR AS INDUCED BY NUCLEI AND IONS. 



By averaging the ionizations between F = o.6 and ^=1.24 in both 

 parts 3 and 4 of the experiments made, the data found are as follows : 



Apparent negative ions N = 278,000 



Apparent positive ions N' = 107,000 



True total ions N + N' = 385,000 



Total nuclei , 180,000 



Hence about 47 per cent of all the ions were caught on exhaustion if the 

 values of u, v, e, N, inserted, are correct. Supposing that negative ions 

 only are caught in the above fog chamber the value of the electron would 

 be 



io 1 V = 3.4X2.i4X- = 3-6 els. units. 



2 



64. Data. Small ionizations. Electric currents. In the next series 

 the aluminum it' , fig. 19, was surrounded by a lead tube with walls o.i 1 7 

 cm. thick, leaving the y rays only effective and these much reduced in 

 intensity. The data are given in figs. 24 and 25. 



65. The same. Coronas. The coronas found at a drop of pressure 

 similar to the above, op/p = o.^oo, corresponded in my reductions to 

 46,200 nuclei in the exhausted fog chamber. Hence at atmospheric 

 pressure there should have been 64,000. The effect of charging the core 

 was not clear; the reduction could be estimated at 51 ,000 at the uttermost. 



66. The same. Summary. The drop of potential in scale parts in 

 successive intervals 30 cm. apart is given in fig. 24, showing how much 

 more slowly the negative charges are lost than the positive charges. The 

 apparent values of ./V are given in fig. 25, to which remarks similar to 

 those already made are applicable. There is the usual drift and the usual 

 temporary fluctuation. 



If the mean data be taken between V = i.i and 1.4 volts the results are 



Apparent positive ions N'= 37,000 



Apparent negative ions N = 98,000 



True total ionization N + N'=> 135,000 



Total nuclei caught 60,000 



It follows, then, that about 44 per cent of the total ionization computed 

 from io 10 = 3.4, u and v, is caught on condensation. 



If we suppose the negative ions only are caught in the above fog cham- 

 ber, the electron value is 



*?Xio 10 =3.4X2.3X- = 3-9 els. units. 



