Jewel bearing
Cojinete de Joya
- Date
- 1704 · confidence high
- Place
- London, England, United Kingdom
- Credited to
- Nicolas Fatio de Duillier, together with Peter and Jacob Debaufre (1704 patent)
- Field
- Tools
What it is
Low-friction bearing in which a metal spindle turns within a hole lined with a hard jewel (sapphire or ruby), used above all in watchmaking and precision instruments for its durability and low friction.
What it led to
- more precise and durable mechanical watches
- precision scientific instruments
- standardized use of synthetic sapphire in mechanisms
- reduced wear in watch parts