Dating stackpole potentiometers
As per the resistance law of the conductor, the resistance of the conductor AC changes as the length of the wire AC changes.
The relationship between the length of the conductors and the voltage across them can be expressed as: Vo/Vs = AC/AB There are number of applications of the potentiometer or pots, of these one of the most common applications is the measurement of displacement.
In actual cases the change in resistance and the distance between the fixed and the moving point is never linear. Lewis Buck 2) Book: Measurement and Instrumentation Principles by Alan S Morris.