446 



Dr. Beattie on Leakage of Electricity from 



Common salt with iodine sprinkled over it placed on zinc 

 strips ; these latter placed on iron plates insulated in iron 

 box : 



Plates charged positively. 

 Flame lit at 9.12. 



Plates charged negatively. 



Time. 



9.35 

 9.36 

 9.37 

 9.39 

 9.40 

 9.42 

 9.44 



Reading in 



scale-divisions*. 



+ 100 



- 70 



- 95 

 -105 

 -120 

 -125 

 -125 



Time. 



9.47 



9.48 

 9.48 



Reading in 



scale-divisions. 



-100 



-125 



-125 



Plates insulated without charge. 



9.51 

 9.52 

 9.53 

 9.55 



o 



-115 

 -130 

 -130 



* 100 scale-divisions = 1 '4 volts. 



The zinc strips were next placed on the bottom of the iron 

 box so that* now they were connected with the case of the 

 instrument ; the iron plates on which they had previously 

 rested were again connected to the insulated terminal of the 

 electrometer: 



No charge given. 

 Flame lit at 1.18. 



Plates charged positively. 



Time. 



1.18 

 1.25 

 1.27 

 1.30 

 1.39 

 1.41 



Reading in 

 scale-divisions *. 

 



. 

 + 10 

 +30 

 +65 

 +65 



Time. 



i 1.42 

 1.46 

 1.49 

 1.50 

 1.57 

 2.08 

 2.09 

 2.10 

 2.14 



Reading in 

 scale-divisions. 

 + 130 

 + 118 

 + 111 

 + 109 

 + 94 

 + 74 

 + 73 

 + 72 

 + 68 



130 scale-divisions =1*4 volts. 



The above figures may be compared with the following 

 which were obtained with a thorium salt and no flame. 



