ELECTRON METHOD OF STANDARDIZING CORONAS. 71 



distribution of ionization increasing from end to end of the fog chamber 

 is still outstanding. It is partially allowed for, since the observations 

 are made near the middle of the chamber, where the average conditions 

 supervene. 



8 



FIGS. 20, 22, 24. Deflection at the electrometer in successive observations 

 4 seconds apart, for successive negative and positive charges in the orders 

 of the numbers on the curves. 



60. The same. Summary. The data of table 23 are given in figs. 20 

 and 21 ; fig. 20 merely shows the fall of potential in scale readings in 

 the successive observations 4 seconds apart, for positive and negative 

 charges. Fig. 21 gives the corresponding positive and negative apparent 



