Wenham recuperative inverted gas flame lamp, British, 1884.

A lamp with decorative Doulton ceramic cylinder casing. The principle of the recuperative gas lamp was to use the heat generated in the lamp to warm incoming air by leading it past the hot products of combustion, producing a hotter, brighter flame. Gas jets isued from a series of holes and the flames bent upwards due to the direction of circulation of the combustion products. A flat ring of luminous flame was formed, producing a downward lighting effect particularly suitable for use in shops.