Velocity of the Electric Current. 173 



Each separate result was the means of at least twenty- 

 five measures, from the chronograph sheets. 

 The following table exhibits the final results : 



April &th. 



Remarks. 



f Not comparable, owing to the 

 -j change of'adjustment between 

 (^ the experiments. 



May 20th. 



C Not comparable. Trouble on 



An inspection of these results show at a glance, that the 

 velocity increases with the number of battery elements 

 employed ; also for the same battery it decreases with the 

 length of the circuit. The question then generally arises, 

 can the apparent velocity be expressed by a rigid mathe- 

 matical formulae ? 



The great difference between the velocities obtained on 

 different nights, as also on the same night, leads us to 

 inquire whether this is a real velocity of the electric im- 

 pulse, or only a mechanical phenomenon manifested in 

 the electro-magnet. 



