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).

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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. Attribution 4.0 International (CC BY 4.0). Source: Wellcome Collection.