Early types of Electric lightning. Top A. Edison's bamboo carbon filament lamps (1880-1 type); bottom left B. Tablochkov's electric candle (1876); bottom right C. Swan's original Newcastle Carbon Rod Electric lamp (1878).

Licence: Attribution 4.0 International (CC BY 4.0)

Credit: Early types of Electric lightning. Top A. Edison's bamboo carbon filament lamps (1880-1 type); bottom left B. Tablochkov's electric candle (1876); bottom right C. Swan's original Newcastle Carbon Rod Electric lamp (1878). Wellcome Collection. Source: Wellcome Collection.