An introduction to the study of colour vision (1915)
Parsons, John Herbert, Sir, 1868-1957 · Cambridge University Press · leaf 109
RECURRENT VISION 89 I have hitherto followed McDougall's excellent paper. It will be readily appreciated that since the response differs in the number and character of the pulses of sensation according to the intensity and nature of the light stimulus, and since the stimulus acts upon two… … Fig. 37. Appearance of a narrow slit, 2° to 5° in width, in a large disc, rotating at one revolution per 3", before a milk-glass illuminated with one acetylene-gas burner, as seen by the light-adapted eye which has been kept covered for about three minutes and then fixed upon any point in or near…
Color vision
Internet Archive · Gerstein - University of Toronto · Public domain (published before 1931). Free to use for anything.
![An illustration from Annual exhibition [electronic resource] : no jury, no prizes (1917)](https://img.insideoutlibrary.com/img/200/ia-bml-N1236_UN3_SO2_1918-65-46.webp)
