The Cartesian Diver (Bottle-Devil)
The Cartesian diver (also called dancing devil, rotating devil or bottle devil) is named after René Descartes. Invented in the 17th century, it became a popular toy, but also a measuring device.
Demonstration model in the Swiss glasswork Glasi Hergiswil.
Available in the museum shop.
Resources:
Photo: wikipedia
Voice actor: H. Gülland