Howard Winter wrote:
> I remember one house we
> lived in many years ago had a relay which switched the storage-heater
> supply under control of a timeswitch, and it consisted of a horizontal
> glass tube with two electrodes at one end and with a blob of mercury in
> it.  To switch on the tube was tilted towards the electodes, and the
> mecury ran down and shorted between them, to switch off it tilted the
> other way and the mercury ran away and uncovered the electrodes.  Is
> this what's known as "mercury wetted contacts"?

No, that's an outright "mercury switch".

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