Large color-mixer for four disks, two upon each spindle. After Wundt, by Krille, Leipzig
Source
Anonymous. 1892. Harvard Psychological Laboratory in Dane Hall: Instruments for Experiments on Sight. Photograph. (Harvard University Archives - HUPSF Psychological Laboratories (7))
Some of the 60 cm diameter discs that Muensterberg lists as "Color Mixer Discs" (No. 72) are in use in this device. Note that there are three discs shown on the image. Only two of them belong to the color mixer. Two smaller disks are mounted on each of them. The third wheel (on the right) probably belongs to another device. See the same device on the cupboard in another image from the same set. See also its cutout versionand more comment on this device.
