Walter Banks wrote:
>> > > http://www.surplussales.com/Meters/MtrTime.html
>> > >
>> > > I'm curious, do they still make them? How do they work anyway?
>> > >
>> >
>> > I'd be surprised if anyone makes them anymore, ROHS compliance would
>> > be an issue.
>>
>> Probably very true.
>>
>> > They work by electroplating the mercury across the bubble. You feed
>> > them a small constant current.
>>
>> Ahh, so basically the current transports the murcury ions from one
>> surface of the bubble to the other? Hence why you can put one in
>> reverse, and the bubble goes backwards?
>>
>> So what's the bubble actually made out of?
>
> The bubble is a generally a small amount of a salt solution. The rate is
> current dependent.

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

Vitaliy 

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