The oldest part of the collection is in the Oval Room, which is also the first location of Martin van Marum's Elektriseermachine now in the middle of the instrument room.
Cabinet I: Thermometry, heat conduction & barometry
View towards the Fossil room II
Cabinet VIII: Sound
Cabinet IX: Sound
w:Graphophone by w:Columbia Phonograph Company, 1897
Cabinet IX: Sound, middle shelf
Cabinet X: Heat & carbon arc lamps