Specific Charge of the Ions emitted by Hot Bodies. 551 



after the gold had been heated for some time, show those 

 characteristics. 



The numbers which are given by two different gold strips 

 when they were first heated are shown in the following 

 table : — 



Gold (freshly heated). Positive Ions. 



z. 



H. 



V. 



X. 



e/m. 



•583 



4850 





160 



1-175 



148 



•583 



4850 





200 



100 



135 



•583 



4850 





81 



1-375 



103 



•487 



4650 





200 



•75 



168 



ATerage values . 



.. e/m=139, Corrected ... e/m=221. 

 m/H = 69-5, m/H= 437. 



The more definite values given by the more normal curves 

 obtained after the metal had been heated for some time are 

 shown in the next table. The numbers represent measure- 

 ments made on three separate strips. 



Gold (after heating 



for some time). Positive Ions. 



z. 



H. 



V. 



X. 



e/m. 



•563 



4850 



122 



1-85 



319 



•563 



4850 



162 



150 



280 



•563 



4850 



202 



1275 



254 



•583 



4850 



325 



1-10 2(54 



•487 



4650 



200 



•97 280 



Average values ... c/m=2&0, C( 

 m/R- 34-5, 



erected ... e/m =445. 

 m/H= 21-7. 



The most natural interpretation of the peculiar behaviour 

 of gold would seem to be that the low values of ejm obtained 

 from a new wire are caused by the presence of impurities 

 which are very readily volatilized. The values obtained after 

 the metal had been heated for some time are not very different 

 from those given by the metals which have already been 

 examined. It is curious that the initial value of ejm is 

 exactly one-half that found later. 



