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A genealogy of the Selwyn family
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 1800 - 1801 (1 years)
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Date |
Event(s) |
| 1 | 1800 | - 1800—1800: Electric light first produced by Sir Humphrey Davy
- 1800—1800: Use of high pressure steam pioneered by Richard Trevithick (1771-1833)
- 1800—1800: Royal College of Surgeons founded
- 1800—1800: Herschel discovers infra-red light
- 1800—1800: Volta makes first electrical battery
- 2 Jul 1800—2 Jul 1800: Parliamentary union of Great Britain and Ireland
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| 2 | 1801 | - 1801—1801: Grand Union Canal opens in England
- 1801—1801: Elgin Marbles brought from Athens to London
- 1 Jan 1801—1 Jan 1801: Union Jack becomes the official British flag
- 10 Mar 1801—10 Mar 1801: First census puts the population of England and Wales at 9,168,000. Population of Britain nearly 11 million (75% rural)
- 24 Dec 1801—24 Dec 1801: Richard Trevithick built the first self-propelled passenger carrying road loco
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