Vitaliy <spam <at> maksimov.org> writes:

> I'm intrigued. So, how is the thing actually used? Once the bubble gets to 
> one side, the current stops?

No, the electrode is 'eaten' and that is not reversible because usually a gas
bubble forms and cuts the current. But normally technicians invert the device in
its socket when it is near the end marker and then you have another 1000 hours
to go. This can be repeated a number of times before the device fails. The
device can be killed by passing too much current. If a gas bubble develops (and
it will) then it's dead. The bubble can be seen against a strong light (the
'salt' solution is black or yellowish-dark, the bubble is clear and usually
elsewhere than where the salt solution is). Also afaik the 'slat' is HgCl2 . Not
very healthy but a tiny amount. I could be wrong on this though.

Peter P.



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