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Differential sonometer, with weights. After Marloye, 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   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.49 (fig. 61).
  Comment   See the same device on another photograph from Münsterberg's catalog.
See a color photograph of this device in the Harvard Collection of Historical Scientific Instruments.
See more color photographs from Thomas Greenslade's collection "Instruments for Natural Philosophy."

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  Description  
ISSN 1866-4784: reference - xlink