The Yablochkov candle, named after Russian electrical engineer Pavel Yablochkov, was an early form of electric arc lamp used for street lighting and other applications in the late 19th century. Developed around 1878, the Yablochkov candle consists of two carbon electrodes placed parallel to each other, separated by a thin insulating material, and encased in a cylindrical glass envelope. When an electric current passes through the electrodes, an arc forms between them, producing light.
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