1912] 



on Very Hvjh Temper atur en. 



323 



devote the remainder of my lecture to a description of the methods 

 employed and tlie results obtained in what proved to be a very 

 intei'esting' investigation. 



Many experiments have been conducted, notably by Prof. O. W. 

 Richardson, on the corpuscular emission of electricity from carbon at 



VOLTS 2 



Pig. 



4.— Relation between Ionization Oubeent and Applied Potentials 

 FOR A 1 CM. Gap between the Electeodes. 



very low pressures, but scarcely anything is recorded for pressures 

 approaching atmospheric. Positive ions and material particles are 

 also discharged by carbon, as well as by hot metals, at suitable tem- 

 peratures and pressures. 



It is to be understood that in all the experiments now to be 

 Vol. XX. (No. 106) z 



