Subject: Copper suplate solutions resistance with distance

A similar question "How does the distance between two electrodes affect the
resistance of a current across a Copper Sulphate solution during electrolysis" 
was asked about this with the response if the electrodes were enclosed by a 
glass tube the resitance with distance would have a porportional relationship. 
I agree with this however in a second experiment (with 2 copper electrodes), I 
measured the resitance in the copper sulpahte solution as I moved the 
electrodes further apart. This however was not enclosed and therefore I did 
not recieve a completely proportional relationship. The resitance did increase 
with distance however not at a constant amount. A graph plotted with resitance 
against distance produced a slight wavy curve i.e. as the electrodes moved 
further away(from 1 to 25cm apart) the resitance increased rapidly however 
then slightly slowed down (at about 10cm) and then finnaly speeded up again. 
After about 6 repeats I recived the same results and therefore assume there 
must be a reasoning for this however can not figure out why. Could you please 
help me.
Regards
Chris Tidy

Re: Copper suplate solutions resistance with distance