Draper point
Punto Draper
- Date
- 1847 · confidence high
- Place
- New York, New York, United States
- Credited to
- John William Draper
- Field
- Cosmos & Earth
What was discovered
The Draper point is the approximate temperature (about 525 °C) above which almost all solid materials begin to visibly glow from black-body radiation, established experimentally by John William Draper.
What it led to
- understanding of black-body radiation
- optical pyrometry based on heat color
- forerunner of Planck's law and thermal quantum physics
- industrial standards for temperature control by incandescence