(Spektrometrischer Apparat)
Description: This apparatus allows the determination of
difference thresholds (in nanometers) of pure spectral colors as
well as estimation of the colors' relation to the Fraunhofer
lines. Unlike the color mixing apparatus, this is for research,
not demonstration. The apparatus, however, only is described as
allowing threshold methods of average error and just noticeable
differences, while the preferred method of constant stimuli is
not mentioned. (Expanded caption Copyright 1998, Edward J.
Haupt)
(Source: Wundt? Philosophische Studien, XIII, p. 4)
Source of illustration: Zimmermann, E. (1903). XVIII. Preis-
Liste über psychologische und physiologische Apparate
(p. 21). Leipzig: Eduard Zimmermann.
DESCRIPTORS:
Type: research
Stimulus: spectral hues
System: vision
Output: threshold magnitude