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Webster 1913 Edition
Drummond light
Drum′mond lightˊ
.[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
. ☞ 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.