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Set of color-disks, 60 ctm. in diameter. 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)) 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 more color disks on another photograph from the same set (here and here).
These discs have probably been used for the Large color-mixer for four disks shown on the same photograph.
  Description  
ISSN 1866-4784: reference - xlink