physics - 1842

Years: 1839 1840 1841 - 1842 - 1843 1844 1845
Decades: 1810s 1820s 1830s - 1840s - 1850s 1860s 1870s
Centuries: 18th century - 19th century - 20th century

1842 was a common year starting on Saturday (see link for calendar).

Events

February 21 - John J. Greenough patents the sewing machine.
March 5 - 00 Mexican troops led by Rafael Vasquez invade Texas briefly occupy San Antonio and then head back to the Rio Grande. This is the first such invasion since the Texas Revolution.
March 30 - Anesthesia is used for the first time in an operation (Dr. Crawford Long performed the operation and ether was used).
March 31 - Middleton Junction and Oldham Branch Railway line opened up to Werneth in North West England.
August 9 - Webster-Ashburton Treaty is signed, establishing the United States-Canada border east of the Rocky Mountains.
Massacre of Elphinstone's British army on the road from Kabul to Jallalabad, Afghanistan, by Mohammed Akbar , son of Dost Mohammed Khan
August 29 - Treaty of Nanking signing ends the First Opium War
British Empire annexes Hong Kong
Pentonville Prison built.
New Zealand seat of government moves from Russell to Auckland
Ohio's Wesleyan University is established.