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'[EE] Mercury coulometer'
2012\10\10@192812 by M.L.

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A while back there was discussion of non-volatile displays. I found
one that nobody thought of:
The Mercury Coulometer

An obscure, antique, highly toxic device that has a glass tube, two
electrodes, and two columns of mercury separated by a liquid
electrolyte.
Electrical current passing through the device transfers mercury from
one side of the electrolyte bubble to the other, creating a linear
indicator - albeit very very slow, fragile, toxic, etc.

See the diagram at the end of this paper for a clearer picture:
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19700023619_1970023619..pdf

-- Martin K

2012\10\10@214728 by Brendan Gillatt

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On 11 October 2012 00:27, M.L. <spam_OUTmTakeThisOuTspamlkeng.net> wrote:
> A while back there was discussion of non-volatile displays. I found
> one that nobody thought of:
> The Mercury Coulometer
>
> An obscure, antique, highly toxic device that has a glass tube, two
> electrodes, and two columns of mercury separated by a liquid
> electrolyte.
> Electrical current passing through the device transfers mercury from
> one side of the electrolyte bubble to the other, creating a linear
> indicator - albeit very very slow, fragile, toxic, etc.
>
> See the diagram at the end of this paper for a clearer picture:
> http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19700023619_1970023619.pdf
>

I actually own one of those devices! It is packaged in a form similar
to a large, glass bodied fuse with wires soldered to both ends. A
graduated paper scale sits behind the mercury column to mark time
intervals. Until now I've not known the name of the device, let alone
how to drive it.

Cheers for the info!

-- Brendan Gillatt
http://www.brendangillatt.co.u

2012\10\10@223727 by Spehro

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!

On 2012-10-11, at 9:47 AM, Brendan Gillatt <.....brendanKILLspamspam@spam@brendangillatt.co.uk> wrote:

{Quote hidden}

I've got one as well, in an old (1970's) Tek dual-beam storage oscilloscope!
Something like 0-5000 hours.

--sp

2012\10\11@011028 by Dave

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You can run them backwards.
Spehro <.....speffKILLspamspam.....interlog.com> wrote:

{Quote hidden}

>

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