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 20
16 Fig. VI. … GREEN YELLOW ORANGE RED BLUE VIOLET The intensities of the spectrum colours of smrlight near mid-day in May are not very different from those of the electric (arc) light, whilst the intensities of the colours of the incandescence electric light when rendered normally incandescent are a very close…
Watercolor painting · Light
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.