The Collaborative International Dictionary of English v.0.48:

Drummond light \Drum"mond light`\ [From Thomas Drummond, a
   British naval officer.]
   A very intense light, produced by turning two streams of gas,
   one oxygen and the other hydrogen, or coal gas, in a state of
   ignition, upon a ball of lime; or a stream of oxygen gas
   through a flame of alcohol upon a ball or disk of lime; --
   called also oxycalcium light, or lime light.
   [1913 Webster]

   Note: The name is also applied sometimes to a heliostat,
         invented by Drummond, for rendering visible a distant
         point, as in geodetic surveying, by reflecting upon it
         a beam of light from the sun.
         [1913 Webster]