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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