herschel

A unit of luminance proposed in 1942 by Parry Moon, corresponding to the blondel, but for radiometric measurements. It is doubtful if it was ever used.

Parry Moon.
A system of photometric concepts.
Journal of the Optical Society of America, volume 32, pages 348-362 (June 1942).

Page 356: “The unit is pi times the lumens per square meter per steradian....The corresponding name in the radiometric system is the herschel.”

Sorry. No information on contributors is available for this page.

home | units index | search |  contact drawing of envelope |  contributors | 
help | privacy | terms of use