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Digital Potentiometers:

Digital potentiometers are three-terminal resistors with an adjustable center connection. To set the output resistance, a digital signal is sent through an electrical interface.

Digital Potentiometers: Learn more
Kelvin-Varley Voltage divider circuit - more economical than the DP-500. Operates in the same way as the DP-500, except that it has an additional, but variable resistance in series with...

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    http://www.ietlabs.com/decaderes-1.html http://www.ietlabs.com/decaderes-1/decade-resistor.html