Carcel

Carcel was a French unit of light intensity .

In 1860 the unit was defined as the light intensity of a Carcel lamp with a standard burner and chimney, operated with 42 g rapeseed oil (from the seeds of Brassica campestris ) per hour and with a flame height of 40 millimeters. The Carcel unit is named after the Parisian watchmaker Bertrand Guillaume Carcel (1750–1812).

Converted into the current unit of light intensity is

1 carcel = 9.74 candelas

literature

Peter Kurzwell: The Vieweg unit lexicon. Friedrich Vieweg and Sohn Verlagsgesellschaft mbH, Braunschweig / Wiesbaden 1999, ISBN 3-528-06987-2 , p. 69.

Individual evidence

^ ^A ^b Russ Rowlett: Carcel entry . In: How Many? A Dictionary of Units of Measurement . University of North Carolina at Chapel Hill. Retrieved May 13, 2009.
^ Carcel definition . In: Webster's Revised Unabridged Dictionary, published in 1913 by C. & G. Merriam Co. . The Free Dictionary. 2009. Retrieved May 13, 2009.
^ SF Johnston: History of light and color . eknigu Science Library. February 23, 2004. Retrieved May 13, 2009.

[Rowlett-1] A ^b Russ Rowlett: Carcel entry . In: How Many? A Dictionary of Units of Measurement . University of North Carolina at Chapel Hill. Retrieved May 13, 2009.

[2] Carcel definition . In: Webster's Revised Unabridged Dictionary, published in 1913 by C. & G. Merriam Co. . The Free Dictionary. 2009. Retrieved May 13, 2009.

[3] SF Johnston: History of light and color . eknigu Science Library. February 23, 2004. Retrieved May 13, 2009.