﻿the Electric Spark is an Electromotor. 45 



Series 1. 

 Knobs of iron at fg. 



Experiment 1. The knobs were at a distance of 3 millims. 

 from each other; and no formation of sparks ensued between 

 them. 



Position of equilibrium when the machine was — 

 A. At work. B. At rest. 



2600 301-5 



2.61-0 302-5 



264 ' 5 Mean . 302-0 



263-0 



Mean . 262*1 



For the sake of brevity, the first position of equilibrium is de- 

 noted by A, and the second by B. 



Experiment 2. The knobs were just so far apart that the for- 

 mation of sparks ceased. 





A. 



B. 





297-3 



299-7 





297-3 



299-7 





297-5 Mean 



. 299-7 



Mean . 



297*4 





Experiment 3 



Like experiment 1. 







A. 



B. 





257-5 



300-5 





258-0 



300-5 





259-5 Mean 



. 300-5 



Mean . 258-3 



Experiment 4. The knobs were at a distance of 1*5 millim. 

 Formation of sparks. 



A. B. 



2690 296-0 



270-8 296-0 



2705 Mean . 296-0 



Mean . 270-1 



Experiments. Distance between the knobs very small. For- 

 mation of sparks. 



A. B. 



289-0 295-8 



289-3 295-8 



288 '° Mean . 295*8 



Mean . 288-8 



When there was a formation of sparks between the knobs/ and 

 g, and these were 3 millims. apart, a mean constant deflection was 



