﻿070 



Dr. T. S. Taylor on the Number of Ions 



It is probable that a detailed investigation into the relation 

 between the conductivities of these mixtures and their com- 

 position would throw valuable light upon the mechanism or! 

 the conduction. The interesting fact is to be noted that the 

 resistance, like that of metals and unlike that of electrolytes, 

 increases with the temperature. The problem is recom- 

 mended to the attention of those who are seeking matters 

 for research. It is possible also that other liquid mixtures 

 would be found more suitable than that of xylol and alcohol. 



Leeds, Feb. 1,1912. 



LXII. A Determination of the Number of Ions produced by 

 an Alpha Particle from Polonium. By T. S. Taylor, 

 Ph.D.* 



Introduction. 



THE investigations herein described were undertaken for 

 the purpose of making a direct determination of the 

 number of ions produced by an alpha particle from polonium. 

 This consisted in measuring the saturation-current produced 

 in an ionization vessel by a limited beam of rays from 

 polonium, the determination of the capacity of the measuring 

 system, and the counting of the number of alpha particles 

 producing the ionization current by means of the scintilla- 

 tions they produce on a zinc sulphide screen during a given 

 interval of time. 



Description of Apparatus. 

 Fi<r. 1. 



T O BATTERY 



awMSS^ 



9 



i 



[TQ ELECTROMETER 



3 



a 



The essential parts of the apparatus, used in the determi- 



nation of the saturation current, are shown in figure 1. 

 * Communicated bv the Author. 



The 



