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Set of twelve tuning-forks, with resonance-boxes, Ut2 Ut3, Mi3, Sol3, La3, Ut4, Mi4, Sol4, seventh harmonic of Ut2, Ut5, Re5, Mi5. 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.21 (fig. 11) and p.20 (no. 38).
  Comment   Note that the photograph shows only 11 forks, the 12th fork is probably located on the top shelf (see another set of tuning forks) on the same photograph.
See color photographs of tuning forks in the Harvard Collection of Historical Scientific Instruments: UT 4, UT 2 and UT 4.
  Description  
ISSN 1866-4784: reference - xlink