Description

This potentiometer is housed in a wood case with a hinged lid. The instrument’s top consists of a black Bakelite panel with various knobs and binding posts. There is a paper instruction sheet on the inside of the instrument's lid. Serial number 85214. Tag from MIT Division of Industrial Colaboration, Aero Elastic.

Potentiometers are instruments that measure the voltage (or potential difference) in a circuit by measuring an unknown voltage with a known one from a standard cell (a battery that produced a known and stable voltage).