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Large color-mixer for four disks, two upon each spindle. After Wundt, by Krille, Leipzig. $35 [acc. to No. 71 in M√ľnsterberg, 1893, Psychological Laboratory at Harvard University]

  Source   Anonymous. 1892. Harvard Psychological Laboratory in Dane Hall: Interior of a Laboratory Room (Students studying the effect of attention on color perception). Photograph. (Harvard University Archives - HUPSF Psychological Laboratories (2)) view the source
  People  
  Sites   Psychological Laboratory, Harvard University (1893)
  Related Literature   M√ľnsterberg, Hugo. 1893. Psychological Laboratory of Harvard University. Cambridge, Mass.: University Press of Cambridge, Mass.
  Comment   Maybe the third wheel on the right is the drive mechanism for this device.
See the same device on another picture from the Harvard photographies and some more comments on its identification.
  Description  
ISSN 1866-4784: reference - xlink