first scientifically constructed oil lamp, patented in 1784 in England by a Swiss, Aimé Argand. The first basic change in lamps in thousands of years, it applied a principle that was later adapted to gas burners. The Argand burner consisted of a cylindrical wick housed between two concentric metal tubes. The inner tube provided a passage through which air rose into the centre to support combustion on the inner surface of the cylindrical flame in addition to that on the outer surface. A glass chimney increased the draft, allowing more complete burning of the oil; an Argand lamp gave about 10 times the light of an earlier lamp of the same size, as well as a cleaner flame, but its oil consumption was greater.