noun
- A unit of illumination equal to the light produced by a standard carcel lamp, formerly used to measure brightness.
Usage: archaic; technical; largely superseded by modern units like candela
Examples
- The carcel was a standard measure of light intensity in the 19th century.
- Early photometric experiments often referenced brightness in carcels.
- Before the adoption of the candela, the carcel served as a common unit in optical measurements.