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Color-wheel, with disks. By Milton Bradley Co., Springfield

  Source   Anonymous. 1892. Harvard Psychological Laboratory in Dane Hall: Instruments for Experiments on Sight. Photograph. (Harvard University Archives - HUPSF Psychological Laboratories (7)) view the source
  People  
  Sites   Psychological Laboratory, Harvard University (1893)
  Related Literature   Münsterberg, Hugo. 1893. Psychological Laboratory of Harvard University. Cambridge, Mass.: University Press of Cambridge, Mass. (description and figure).
  Comment   See another Milton Bradley color mixer on the same photograph.
See also the same device on another photograph from the Harvard collection.
The History of Psychology Collection at Banard College refers to this device as Milton Bradley color mixing apparatus and provides a color photograph.
  Description  
ISSN 1866-4784: reference - xlink