Source : Webster's Revised Unabridged Dictionary (1913)

Carcel \Car"cel\, n. (Photom.)
   A light standard much used in France, being the light from a
   Carcel lamp of stated size and construction consuming 42
   grams of colza oil per hour with a flame 40 millimeters in
   height. Its illuminating power is variously stated at from
   8.9 to 9.6 British standard candles.