Polyaniline was first described in the mid-19th century by Henry Letheby, who investigated the electrochemical and chemical oxidation products of aniline in acidic media.
A modified version of the interrupter was produced by Henry Letheby which could output only the make, or only the break currents by a mechanism consisting of two spoked wheels.
In 1862, Henry Letheby obtained a partly conductive material by anodic oxidation of aniline in sulfuric acid.
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