Home > 1843 in science

The year 1843 in science and technology included many events, some of which are listed here.

1 Astronomy

• John Couch Adams predicts the existence and location of Neptune from irregularities in the orbit of Uranus
• Heinrich Schwabe reports a periodic change in the number of sunspots: they wax and wan in number according to a ten-year cycle

2 Chemistry

• Carl Mosander discovers Terbium and Erbium

3 Mathematics

• Pierre-Alphonse Laurent discovers and presents the Laurent expansion theorem
• William Rowan Hamilton discovers the calculus of quaternions and deduces that they are non-commutative
• Arthur Cayley and James Joseph SylvesterJames Joseph Sylvester ( September 3, 1814 March 15, 1897) was an English mathematician and lawyer. Sylvester was born in London and studied at St John's College, Cambridge from 1833 but because he was Jewish he did not graduate. However, he took Cambridg found the algebraic invariant theoryIn mathematics, invariant theory refers to the study of invariant algebraic forms (equivalently, symmetric tensors) for the action of linear transformations. This was a major field of study in the latter part of the nineteenth century, when it appeared th

4 Physics

• James Joule experimentally finds the mechanical equivalent of heat

5 Technology

• Launch of SS Great BritainThe Steam Ship Great Britain was the first ocean-going ship to have an iron hull, or a screw propeller, and when launched in 1843 was the largest vessel afloat. History The SS Great Britain was designed by Isambard Kingdom Brunel, Thomas Guppy, Christophe, the first iron-hulled, propeller-driven ship to cross the Atlantic OceanFor other uses, see Atlantic (disambiguation The Atlantic Ocean is Earth's second-largest ocean, covering approximately one-fifth of its surface. The ocean's name, derived from Greek mythology, means the " Sea of Atlas". This ocean occupies an elongated,
• Robert StirlingThe Reverend Dr Robert Stirling ( October 25, 1790 June 6, 1878) was a Scottish clergyman, and inventor of a highly efficient heat engine. All closed-cycle regenerative gas engines are now known as Stirling engines. Stirling was born in Cloag, Perthshire, and his brother James convert a steam engine at a DundeeFor other uses see Dundee (disambiguation Dundee is Scotland's fourth largest city, population 154 674 (2001), situated on the North bank of the Firth of Tay. The city is built on the basalt plug of an extinct volcano (174 m (571 feet)), now called Dundee factory to operate as a Stirling engineThe Stirling engine was invented in 1816 by the Rev. Robert Stirling who sought to create a safer alternative to the steam engines of the time, whose boilers often exploded due to the high pressure of the steam and the primitive materials of the time.
• The first public telegraph line in the United Kingdom is laid between Paddington and Slough
• Completion of the Thames Tunnel, the first underwater tunnel in the world