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Phakoscope, for demonstrating accommodation of lens. After Helmholtz, by Sittel, Heidelberg

  Source   Anonymous. 1892. Harvard Psychological Laboratory in Dane Hall: Interior of a Laboratory Room. Photograph. (Harvard University Archives - HUPSF Psychological Laboratories (1)) view the source
  People   Helmholtz, Hermann Ludwig Ferdinand von (1821 - 1894)
  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).
Cyon, Elie de. 1876. Atlas zur Methodik der Physiologischen Experimente und Vivisectionen. Giessen, St. Petersburg: Carl Ricker, on p.23.
  Comment   See another figure of this instrument in the 1899 catalog of the Cambridge Scientific Instruments Co. (no. 261).
See a colour photograph of the phakoscope in the Harvard Collection of Historical Scientific Instruments.
  Description  
ISSN 1866-4784: reference - xlink