History
Century
History of Watchmaking
Adrien Philippe's keyless winding mechanism, patented in 1845.
World history
End of the first Opium war.
The Chinese Emperor Dao Guang ratified the Nanking Treaty which provided for the cession of Hong Kong to the British, and the opening to foreign trade.
Swiss history
Following the 1841 revolution, a new Constitution adopted universal men's suffrage.
Geneva became an independent commune with an elected municipal council.
Art and Culture
Foundation of the American Art Union.
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