(Rotations-apparat mit Doppelachsen)
Description: This apparatus was used to spin two color mixing
wheels in different directions and at speeds that were higher
than could be obtained by a single axle unit. (Expanded caption
Copyright 1998, Edward J. Haupt)
(Source: None given.)
Source of illustration: Zimmermann, E. (1903). XVIII. Preis-
Liste über psychologische und physiologische Apparate
(p. 4). Leipzig: Eduard Zimmermann.
DESCRIPTORS:
Type:demonstration
Stimulus: colored, gray, or patterned disks
System: vision
Output: N/A