﻿Thermions from the Salts of the Alkaline Earths. 

 Strontium Chloride. 



133 



The samples of this salt were from a supply furnished by 

 Eimer and Amend. Six values of e\m were obtained from 

 one sample during a period of forty hours' heating at tem- 

 peratures between 1000° C. and 1200° C. 



The tabulated results follow : — 



Strontium Chloride. 



V. 



H. 



d. 



2x. 



•257 



e/m. 



222 



298 



2915 



1-285 



96 



298 



2915 



1-285 



•254 



93 





284 



2915 



1-285 



•257 



92 





325 



2915 



1-285 



•241 



92 





324 



2915 



1-285 



•241 



92 





275 



2915 



1-285 



•273 



99 





Strontium Fluoride. 



Samples of this salt were prepared from Kahlbaum's 

 strontium carbonate, Baker's analysed hydrochloric acid, and 

 Baker's analysed hydrofluoric acid. 



The results seem in no way exceptional. A measurable 

 current was obtained at about 500° C. or 600° C. The data 

 for rhis emission appear on the first line below, and are taken 

 to indicate potassium. The data given on the second line 

 were obtained after two hours' heating and at a slightly 

 higher temperature. 



Strontium Fluoride. 



*■ 



H. 



d. 



2x. 



e/m. 



407 



2915 



1-34 



•359 



215 



407 



2915 



1-34 



•362 



220 



407 



2915 



1-34 



•263 



116 



407 



2915 



1-34 



•248 



103 



| 



(•/*o 8r++ («/«) K+ i 



22 



249 



After an additional heating of nine hours at about 700° C. 

 the thermionic current was practically zero, but was re- 

 established by increasing the temperature to about 1000° 0. 

 Two pairs of curves taken at this temperature furnished the 

 results given on the third and fourth lines. The value of 

 e/m for the ions at this temperature, it will be seen, agree 

 well with one-half the electrolytic value for strontium. 



