Yablochkov candle

Yablochkov candle with part of the bulb removed to show the two parallel carbon rods separated slightly from each other by a layer of plaster of Paris.
Wikisource has original text related to this article:

A Yablochkov candle (sometimes electric candle or Jablochkoff candle) is a type of electric carbon arc lamp, invented in 1876 by the Russian electrical engineer Pavel Yablochkov.