1840 In Science

Astronomy

• John William Draper invents astronomical photography and photographs the Moon

Exploration

• Adelie land first visited by Jules Dumont d'Urville and claimed for France

Geology

• Louis Agassiz publishes his Studies on Glaciers

Technology

• William Fox Talbot invented the positive / negative process of photography used in all modern photography. He refers to this as photogenic drawing

Awards

• Copley Medal: Justus Liebig
• Wollaston Medal: Andre Hubert Dumont

Births

• February 4 - Hiram Maxim (d. 1916), inventor of the machine gun.
• February 5 - John Boyd Dunlop (d. 1921), inventor.
• February 10 - Per Teodor Cleve (d. 1905), chemist.
• March 28 - Emin Pasha (d. 1892), explorer.
• August 4 - Richard von Krafft-Ebing (d. 1902), sexologist.

Deaths

• April 25 - Simeon Poisson (b. 1781), mathematician.
• March 2 - Heinrich Wilhelm Matthus Olbers (b. 1758), astronomer.

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