The Demon Cartesian Diver

A Cartesian diver is a scientific novelty. If you place it in a plastic bottle full of water and screw on the top, as you squeeze on the bottle the diver sinks and rises on your command. The advertisement is from a Davenports catalogue. Modern versions of this novelty can still be purchased, although they are likely to be made out of plastic.

Details

Size Height 30mm
Date Probably 1920s or 1930s.
Key Phrases ,
Category
Ref no N2490