"Jablochkov candles"
Jablochkov candles illuminating the music hall on la Place du Chateau d'eau, Paris ca.1880
Public DomainJablochkov candles illuminating the music hall on la Place du Chateau d'eau, Paris ca.1880 - Credit: Wikimedia Commons

The Yablochkov candle was an electric carbon arc lamp invented by Pavel Yablochkov in 1876.

Yablochkov's design removed the need for a mechanical regulator to keep the lamp's carbon blocks at the same distance from one another.

It was first demonstrated during the Paris Exhibition of 1878.