This one looks more complex than you describe.
However, I have one of the more simplified units, as you describe (At
least, I think I do), which I would like to learn more about...
Dan
On 8/24/2012 8:00 AM, [email protected] wrote:
Its a potentiometer used to measure dc voltage.
A standard cell was used to set the total voltage across a series string
of resistors and a slide wire.
The dc voltage to be measured was balanced against the voltage developed
across a selected substring of resistors and the tap on a slide wire.
Lead acid batteries and similar cells were used as a source for the
slide wire and series resistor string current.
A galvanometer was used a s a null detector to determine when the
v0oltage across the slide wire and series resistor string were equal.
The resistors were typically immersed in mineral oil contained within a
copper tank below the ebonite (or similar ) faceplate.
Bruce
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