3 Free Photos of Rudolph Koenig

cc-pd-markauthor died more than 100 years ago public domain imagescc-zeroscientific instruments in the harvard university science center
Three-wheel wave siren, Rudolph Koenig, Paris, c. 1889 - Putnam Gallery - Harvard University - DSC08079
self-published workcc-pd-mark
Helmholtz's large apparatus for compounding timbres of 10 harmonics, Rudolph Koenig, Paris, c. 1865 - Putnam Gallery - Harvard University - DSC08080
self-published workcc-pd-mark
PSM V37 D448 Rudolph Koenig
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