Carcel Explained

The Carcel is a former French unit for measuring the intensity of light. The unit was defined in 1860 as the intensity of a Carcel lamp with standard burner and chimney dimensions, which burnt colza oil (obtained from the seed of the plant Brassica campestris) at a rate of 42 grams of colza oil per hour with a flame 40 millimeters in height.[1] [2]

In modern terminology one carcel equals about 9.74 candelas.[3]

See also

Notes and References

  1. Web site: Carcel definition . 2009. Webster's Revised Unabridged Dictionary, published 1913 by C. & G. Merriam Co.. The Free Dictionary. 2009-05-13.
  2. Web site: History of light and color. Johnston. S.F.. Feb 23, 2004. eknigu Science library. 2009-05-13. https://web.archive.org/web/20100616190922/http://eknigu.org/info/P_Physics/PPop_Popular-level/Johnston%20S.F.%20History%20of%20light%20and%20color%20(IOP,%202001)(292s).pdf. June 16, 2010. dead.
  3. Web site: Carcel entry. Rowlett. Russ . How Many? A Dictionary of Units of Measurement. University of North Carolina at Chapel Hill. 2009-05-13.

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