[Boatanchors] Dc Voltmeter Calibration

[Ray, W4BYG]

I have in my curio of parts an unmounted device that consist of two 
connected sealed glass tubes, pointed on the ends and with a red and a 
black wire coming out of the opposite bases.  It is marked as made by 
"Muirmead" with a number 3057_ (last digit unreadable).  There is a 
clear fluid in the tubes.

When measured at the wire ends it consistently gives 1.0169 VDC, via my 
Tektronix DMM-916.  It measures the same year after year.  It appears to 
be a chemically energized lab grade voltage standard.

I have no recollection how I obtained this.  I've had it for maybe 25 or 
30 years.  Would be curious if anyone knows how it works.
Ray, W4BYG
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I'm no longer young enough to know everything!