OK people, by George I do believe I have finally got it.  I have been digesting 
all of this while you were all making 'zeds' and now the light bulb has finally 
lit.

If I understood electricity better I would have seen it earlier.

Current is high when first starting and gradually falls as production proceeds. 
 What is required is a 'current limiter' so that when enough time has passed 
and the process gets to the current limiter rating...that is the time to stop 
production.  As I suggested to someone earlier, I'm sorry but I can't remember 
who so no offence meant, "voltage is just the means to an end".

This is what stumped me on the weekend... I hooked the amp meter on and the 
reading never stopped, it kept...damn, I am going to have to check that again, 
but I think it kept going down.  Now I understand what is going on.  I set 
everything up using tap water to get instant results, or readings if you like, 
and the reading was changing almost every second.  I expected it to remain the 
same.  AH HA!!  If what I have stated here is correct then........I  HAVE 
FINALLY GOT IT SUSSED!  I didn't realise just how 'blunt' this knife was!

No good me talking to a 'sparky' as it was all goggledeegook to me.

I now eagerly await your awakening with the hope that you will agree that I now 
know what is going on.  You can't imagine my elation that I now see how damn 
simple it is. DUH!!

I needed to have it explained it in it's simplest form.  Other people I have 
spoken to must practice the old addage..."If you can't convince 'em, confuse 
'em".  I still can't believe how simple it is, if I am right.  Jeez, how thick 
am I ?...alright, I'm not looking for an answer to that!

Neville.