An introduction to the study of colour vision (1915)
Parsons, John Herbert, Sir, 1868-1957 · Cambridge [Eng.] : University Press; New York, G.P. Putnam's Sons · leaf 193
COLOUR VISION 178 unable to discover any difference produced by dark adaptation in colour matches with small central fields. A greenish yellow spot on a red background appeared to match the background both for the light- adapted and dark-adapted eye so long as it was fixated exactly. On … Fig. 52. Scotopic values of the homogeneous lights Scotopic values of the photopic equivalent red (642 MM) — blue (460-8 MM) mixture. Abscissae, wave-lengths of the prismatic spectrum of gaslight ; ordinates, arbitrary scale, (v. Kries and Nagel.) slight deviation (1° to 2°) of the dark-adapted eye…
Color vision
Internet Archive · University of California Libraries · Public domain (published before 1931). Free to use for anything.
![An illustration from Wedding's Basic Bessemer Process. Translated [from the supplement to the author's Darstellung des schmiedbaren Eisens” entitled, “Basische Bessemer oder Thomas Process”] ... by W. B. Phillips ... and E. Prochaska ... With a supplementary chapter on dephosphorization in the basic open-hearth furnace, by E. Prochaska (1891)](https://img.insideoutlibrary.com/img/200/bl-bl_003874923_0-162-1.webp)
