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 for Burning glass
From The Collaborative International Dictionary of English v.0.48 :

  Burning \Burn"ing\, n.
     The act of consuming by fire or heat, or of subjecting to the
     effect of fire or heat; the state of being on fire or
     excessively heated.
     [1913 Webster]
     Burning fluid, any volatile illuminating oil, as the
        lighter petroleums (naphtha, benzine), or oil of
        turpentine (camphine), but esp. a mixture of the latter
        with alcohol.
     Burning glass, a convex lens of considerable size, used for
        producing an intense heat by converging the sun's rays to
        a focus.
     Burning house (Metal.), the furnace in which tin ores are
        calcined, to sublime the sulphur and arsenic from the
        pyrites. --Weale.
     Burning mirror, a concave mirror, or a combination of plane
        mirrors, used for the same purpose as a burning glass.
        [1913 Webster]
     Syn: Combustion; fire; conflagration; flame; blaze.
          [1913 Webster]

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