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'[PICLIST] PICLIST Digest - 13 Jan 2002 to 14 Jan 2'
Peter L. Peres
> 1.4 V *mercury* cell reference
You got your things slightly mixed here imho. The reference you should not
upside down is a Weston cell, and gives 1.0xxx volts at 20C (not 25C).
Mercury cells are indeed used in some older bridge instruments as
reference and their working position is indifferent. They look exactly
like a button cell (in fact, they are button cells). The most common use
is in older cameras (light meter). They have also become unobtainable
since greenies have decreed that mercury (which is mined from the earth as
is and purified for industrial use) is bad for the earth (they were
talking about *their* earth apparently). Of course mercury is toxic, if
you eat it, or drink it. Bad stuff. So is too much salt by the way
http://www.piclist.com hint: To leave the PICList
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