A unit of luminous energy in the meter-kilogram-second system, first proposed in 1937. One talbot = 1 lumen-second.

It is named for W. H. Fox Talbot (1800-1877).

Loyd A. Jones.
Colorimetry: Preliminary draft of a report on nomenclature and definitions.
Journal of the Optical Society of America, volume 27, page 211 (June 1937).

Page 211: “Referring again to Table I, terms (21) and (22) represent names for units which the committee [Committee on Colorimetry, Optical Society of America-ed.] has voted to adopt. The decision was almost unanimous [16 to 2-ed.] in the case of recommending talbot as a psychophysical correlate of joule.”


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