Births on April 21

Jean-Baptiste Biot

Born on April 21, 1774

Jean-Baptiste Biot, French physicist, astronomer, and mathematician (d. 1862)

Jean-Baptiste Biot (; French: [bjo]; 21 April 1774 – 3 February 1862) was a French physicist, astronomer, and mathematician who co-discovered the Biot–Savart law of magnetostatics with Félix Savart, established the reality of meteorites, made an early balloon flight, and studied the polarization of light.

The biot (a CGS unit of electrical current), the mineral biotite, and Cape Biot in eastern Greenland were named in his honour.

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Jean-Baptiste Biot

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Events on 1774

31 Mar

Boston Port Act
American Revolutionary War: The Kingdom of Great Britain orders the port of Boston, Massachusetts closed pursuant to the Boston Port Act.
2 Jun

Quartering Act
Intolerable Acts: The Quartering Act is enacted, allowing a governor in colonial America to house British soldiers in uninhabited houses, outhouses, barns, or other buildings if suitable quarters are not provided.
21 Jul

Treaty of Küçük Kaynarca
Russo-Turkish War (1768-74): Russia and the Ottoman Empire sign the Treaty of Küçük Kaynarca ending the war.
1 Aug

Oxygen
British scientist Joseph Priestley discovers oxygen gas, corroborating the prior discovery of this element by German-Swedish chemist Carl Wilhelm Scheele.
1 Sep

Powder Alarm
Massachusetts Bay colonists rise up in the bloodless Powder Alarm.

Births on April 21

Jean-Baptiste Biot

Born on April 21, 1774

References

Choose Another Date

Events on 1774

Boston Port Act

Quartering Act

Treaty of Küçük Kaynarca

Oxygen

Powder Alarm