Sounds like a bingo. There is an old piece of tape on the side of the case
on which someone wrote "1.01998 volts," followed some other tiny scribbles
which have been worn off.

Phil

"dale" wrote in message
...
[The "standard cell" is a saturated Weston cell, containing an electrode
of mercury in

contact with a paste of mercurous sulfate and an electrode of cadmium
amalgam in

contact with a saturated solution or cadmium sulfate. When little or no
current is drawn

from the cell, it produces a terminal voltage of long-term stability. The
precise value for

each cell is given on its label.]