Report to the Science and Art Department of the Committee of Council on Education on the action of light on water colours : presented to both Houses of Parliament by command of Her Majesty (1888)
Russell, William James, Abney, William de Wiveleslie, Sir, 1843-1920, Great Britain. Department of Science and Art · London : Printed for H.M.S.O. by Eyre and Spottiswoode · leaf 75
m. 1,5.50 180 3.000 5,480 4,040 5,180 4,640 5,460 The above tables are close approximations to the true values. It should be stated that the sun’s declination has also been taken as equal on the 21st of January and November, February and October, March and September, April and October, and May and… … by taking the areas of these curves. Fig. XIII. shows the work in the units we have adopted, but multiplied by three
Watercolor painting · Light
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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