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Two perimeters. After Landholt and Priestley Smith, by Meyrowitz, New York

  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).
Titchener, Edward Bradford. 1910. The Quality of Sensation: Vision. In: A Textbook of Psychology (1910), 59-92, on on p.81.
  Comment   See a color photograph of this device in the Harvard Collection of Historical Scientific Instruments.
See figures of similar instruments in catalogs by Waldek & Wagner, 1905, No. 210 and Katsch, 1906, No. 885.
  Description  
ISSN 1866-4784: reference - xlink