Phil Nelson wrote:
Any idea what this battery was used for? Found it at a flea market for $1.

The two-piece Bakelite case says The Bristol Company, Waterbury, Conn.
Inside are two glass capsules with different stuff in the bottom. The
bottom stuff in capsule looks like clay, the other looks like a ball of
wrinkled foil. A sticker on the left capsule says the Eppley Laboratory,
Newport, R.I.

Both capsules still contain liquid. They are cushioned in a tidy little
felt blanket.

Phil "just curious" Nelson
Phil's Old Radios
http://antiqueradio.org/index.html

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Ha! That inside view is exactly the picture in my old
study books showing a standard voltage reference.
It might even still work.
If you want to test, use a high quality voltmeter,
and check its voltage.
DONT let it deliver any current, because it becomes
useless rather quickly.
In my book its called a WESTON ELEMENT, and used as a
calibration standard(very expensive).
On the plus site is mercury, covered with cadmium sulfate.
On the minus site is mercury+12percent cadmium, also covered
with cadmium sulfate.
The fluid is water saturated with cadmium sulfate.
The voltage should be 1.0183 volt at 20 degree Celcius.(68 F)
The book is from 1958