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Series of ten resonators. After Helmholtz, by Koenig, Paris

  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 von (1821 - 1894)
Koenig, Rudolph (1832 - 1901)
  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).
Koenig, Rudolph. 1889. Catalogue des Appareils d'Acoustique construits par Rudolph Koenig. Paris, on p.25 (no. 54a).
  Comment   See a color photograph of these devices in the Harvard Collection of Historical Scientific Instruments.
  Description  
ISSN 1866-4784: reference - xlink