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.
The Demon Cartesian Diver
Item Details
| Size | Height 30mm |
|---|---|
| Date | Probably 1920s or 1930s. |
| Key Phrases | Novelties, Toys and games |
| Category | Novelties, Toys, Games & Jokes |
| Ref no | N2490 |