Abstract
We have been much interested in colors recently. Many colorful things are found in various fields. They enrich our life. We have, however, to investigate color not only from a viewpoint of feelings, but also from a viewpoint of human engineering ; problems of safety, efficiency, fatigue, and relaxation should be taken into consideration.
This investigation is concentrated on fatigue of the Kräpelin work. The degree of fatigue is shown by F. V. (flicker value).
(1) f (mean fault) and n (rate of initial effort) of the work depend on the degree of fatigue immediately before starting the work.
(2) Those who participated in the test stared the surrounding color in the testing room for five minutes under a specific light, and flicker values obtained before and after the staring were compared for different colors and lights.
Fatigue was most with the day fluorescent lamp and least with the white fluorescent lamp. The day fluorescent lamp also made f and n values worse in the Kräpelin work.
(3) The comparison between flicker values obtained before and after the work, including staring and Kräpelin, disclosed that the incandescent lamp caused the greatest fatigue in white surroundings. This must have been derived by the interrelation between brightnesses of the sheet of Krapelin work and the lamp.
