176 



Dr. C. Shear d on the Positive 



Curve 1, fig. 2, or the data in Table III., shows the relation 

 between the negative currents and the temperature, and was 







Fig. % 







140 









l 



i 



i ' 



l£0 









-4- 



i 



! 





go 

 6o 









i' 











/ 



/ 













/ i 



£40 



CO 







i 









1 





II 







1 



C 











O 



















750* 



7?0* 



81 o° 



84^ 



S70°C 



r enr/i erasure 



taken after Curves I. and II. of fig. 1. It will be noted that 

 the negative emission becomes measurable at 760° C. or ap- 

 proximately the temperature at which the positive emission^ 

 under the treatment described, begins to fall away from its 

 maximum value. 



The quantity o£ positive ions, or of material capable of 

 producing- such ions, decreases as the wire is heated from 

 756-850° C, while the negative currents increase rapidly 

 within this same temperature range. It is a well known 

 fact that a heated metallic wire discharges positive electricity 

 at a lower temperature than it does the negative. The 

 negative electrification from hot wires and a considerable 

 number of salts has been found to be wholly electronic in 

 nature. In the case of certain salts containing the strongly 



