﻿the Elective Spark is an Electromotor. 4<7 



Experiment 10. Like the preceding. 



A. B. 



265-5 299-0 



261-0 298-6 



267,5 Mean . 298-8 

 263-5 



Mean . 264*4 



Experiment 11. The knobs so far apart that no spark formed. 



A. B. 



295-8 297-5 



295-8 297-5 



2955 Mean . 297'5 

 Mean . 295-7 



Experiment 12. The knobs at a distance of 1*5 millim. For- 

 mation of sparks. 



A. B. 



271-8 297*5 



271-0 297-5 



274,3 Mean . 2975 



Mean . 272*4 



Experiment 13. The knobs removed apart from each other. 

 No formation of sparks. 



A. B. 



2950 297-0 



295-0 2970 



Mean . 2950 Mean . 2970 



When the distance between the knobs amounted to 3 milliins., 

 the mean deflection was 33*7 divisions, and therefore somewhat 

 smaller than when brass knobs were used. 



Series 4. 



Both the knobs / and g were removed from the bridge between 

 c and e and inserted at n instead ; c and e, on the contrary, were 

 joined by the rheostat wire of German silver, which had pre- 

 viously been at m. The deflections thus obtained were now to 

 the right of the scale, instead of to the left as the others had been 

 — a deportment which can only be explained on the assumption 

 that the spark is electromotive. 



