# Polarograph > Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Polarograph > Markdown URL: https://mediated.wiki/source/Polarograph.md > Source: https://en.wikipedia.org/wiki/Polarograph > Source revision: 1245448250 > License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) thumb|300x300px|Workplace with Polarograph on the left A '''Polarograph''' is a chemical analysis instrument used to record automatic voltage-intensity curves. The '''Polarograph''' uses an electrolytic cell consisting of an electrode or [microelectrode](/source/microelectrode) small area, generally of the mercury drop type, which is a very fine [capillary tube](/source/capillary_tube) through which mercury flows slowly, which comes in the form of small droplets, which fall on the same surface of a much broader element, which is the other electrode . When one applies a variable voltage in this cell, the electrode's large area remains unchanged, while the [microelectrode](/source/microelectrode) undergoes a change of potential, ( i.e. is polarized). It also has a [potentiometer](/source/potentiometer) coupled to the motor that moves the recording paper so that a certain voltage variation corresponds to a constant length of recording paper, and a galvanometer suitable for measuring the intensity of the electric current, whose response is transmitted to the actuator that moves the needle of the recorder. The technique used is called [polarography](/source/polarography).«[http://www.enciclopedia.cat/EC-GEC-0133061.xml polarògraf]». The Czech chemist and Nobel Prize winner [Jaroslav Heyrovský](/source/Jaroslav_Heyrovsk%C3%BD) invented it. == References == {{reflist}} Category:Scientific instruments --- Adapted from the Wikipedia article [Polarograph](https://en.wikipedia.org/wiki/Polarograph) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Polarograph?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.