In 1806, Thomas Bruce, 7th Earl of Elgin, ambassador to the Ottoman Empire from 1799 to 1803 removed the large collection of marble sculptures from the Parthenon, on the Acropolis in Athens and transferred them to the UK.

Thomas Young's sketch of two-slit diffraction, which he presented to the Royal Society in 1803

Thomas Young performed a celebrated experiment in 1803 demonstrating interference from two closely spaced slits.

In 1803, Irish poet Thomas Moore arrived in Bermuda, having been appointed registrar to the Admiralty there.

He was the eldest of four surviving children ; his younger siblings were George ( 1797 – 1841 ), Thomas ( 1799 – 1818 ), and Frances Mary " Fanny " ( 1803 – 1889 ).

In 1803, President Thomas Jefferson commissioned the Corps of Discovery, and named U. S. Army Captain Meriwether Lewis its leader, who selected William Clark as his partner.

In 1803 in the midst of the Napoleonic wars between France and Britain, Thomas Jefferson authorized the Louisiana Purchase, a major land acquisition from France that doubled the size of the United States.

The presidential authority to commission officers would have a large impact on the 1803 case Marbury v. Madison, where outgoing Federalist President John Adams feverishly signed many commissions to the judiciary on his final day in office, hoping to, as incoming Democratic-Republican President Thomas Jefferson put it, " into the judiciary as a stronghold.

Thomas Young's sketch of two-slit diffraction of waves, 1803

* Thomas Stock ( 1750 – 1803 ), English clergyman

Clay and his wife had eleven children ( six daughters and five sons ): Henrietta ( 1800 – 1801 ), Theodore ( 1802 – 1870 ), Thomas ( 1803 – 1871 ), Susan ( 1805 – 1825 ), Anne ( 1807 – 1835 ), Lucretia ( 1809 – 1823 ), Henry, Jr .( 1811 – 1847 ), Eliza ( 1813 – 1825 ), Laura ( 1815 – 1817 ), James Brown ( 1817 – 1864 ), and John ( 1821 – 1887 ).

In 1803, President Thomas Jefferson issued the following instructions to Meriwether Lewis: " The object of your mission is to explore the Missouri river, & such principal stream of it, as, by its course & communication with the waters of the Pacific Ocean, whether the Columbia, Oregon, Colorado and / or other river may offer the most direct & practicable water communication across this continent, for the purposes of commerce.

In 1803 President Thomas Jefferson obtained from France the Louisiana Purchase for fifteen million dollars ( equivalent to about $ 230 million today ) which included all the land drained by the Missouri River and roughly doubled the size of U. S. territory.

Thomas Percival was a British physician who published a book called Medical Ethics in 1803.

In a famous letter to Meriwether Lewis in 1803, Thomas Jefferson instructed the Lewis and Clark expedition to " carry with you some matter of the kine-pox ; inform those of them with whom you may be, of its efficacy as a preservative from the smallpox ; & encourage them in the use of it ..." Jefferson had developed an interest in protecting Native Americans from smallpox having been aware of epidemics along the Missouri River during the previous century.

This is how Thomas Young speaking on November 24, 1803, to the Royal Society of London, began his description of the historic experiment.

After the Louisiana Purchase in 1803, President Thomas Jefferson and his successors viewed much of the land west of the Mississippi River as a place to resettle the native Americans, so that white settlers would be free to live in the lands east of the river.

* 1803 – Thomas Moore of Baltimore, Md.

* 1803 — Thomas Young develops the Double-slit experiment and demonstrates the effect of interference.

In 1803 as he was set to leave Rome, he received the commission to execute the Jason in marble from Thomas Hope, a wealthy English art-patron.

Houdon's subjects include Denis Diderot ( 1771 ), Benjamin Franklin ( 1778-09 ), Jean-Jacques Rousseau ( 1778 ), Voltaire ( 1781 ), Molière ( 1781 ), George Washington ( 1785 – 88 ), Thomas Jefferson ( 1789 ), Louis XVI ( 1790 ), Robert Fulton, 1803 – 04, and Napoléon Bonaparte ( 1806 ).

With the Louisiana Purchase in 1803, which doubled the size of the United States, Thomas Jefferson set the stage for the continental expansion of the United States.

In 1803, the Louisiana Purchase by Thomas Jefferson brought the area under United States control.

In 1803, Thomas Hopper was the first to settle in this county near Hardinsburg.

On 21 October 1803, co-founder and leader of the United Irishmen, Thomas Russell, " the man from God knows where ", was hanged outside Downpatrick Gaol for his part in Robert Emmet's failed rebellion of the same year.

It met in Washington, D. C. from March 4, 1801 to March 3, 1803, during the first two years of Thomas Jefferson's presidency.

Jefferson's Louisiana Purchase of 1803 doubled the size of the nation at the cost of $ 15 million ( about $ 0. 04 per acre ).

He supported Jefferson's purchase of Louisiana in 1803 and tried to get Jefferson to purchase Florida as well.

After serving as President Thomas Jefferson's spokesman in the House, he broke with Jefferson in 1803 and became the leader of the " Old Republican " or " Quids ", an extreme states ' rights vanguard of the Democratic-Republican Party who wanted to restrict the role of the federal government.

* 1803 – Louisiana Purchase: The United States purchases the Louisiana Territory from France for $ 15 million, more than doubling the size of the young nation.

* 1803 – Thousands of meteor fragments fall from the skies of L ' Aigle, France ; the event convinces European science that meteors exist.

Fricktal, ceded in 1802 by Austria via Napoleonic France to the Helvetic Republic, was briefly a separate Swiss canton under a Statthalter (' Lieutenant '), but on 9 March 1803 was incorporated in the canton of Aargau.

The United States acquired of land from France under the Louisiana Purchase in 1803.

It was a deception ; Toussaint was seized and deported to France, where he died of pneumonia while imprisoned at Fort de Joux in the Jura Mountains in April 1803.

In 1803, war resumed between France and Britain, and with the Royal Navy firmly in control of the seas, reinforcements and supplies for Rochambeau never arrived in sufficient numbers.

He gained experience as an executive as the Governor of Virginia and rose to national prominence as a diplomat in France, when he helped negotiate the Louisiana Purchase in 1803.

Louisiana remained nominally under Spanish control until a transfer of power to France on November 30, 1803, just three weeks before the cession to the United States.

In November 1803, France withdrew its 7, 000 surviving troops from Saint-Domingue ( more than two-thirds of its troops died there ) and gave up its ambitions in the western hemisphere.

In 1803, Pierre Samuel du Pont de Nemours, a French nobleman, began to help negotiate with France at the request of Jefferson.

But in early 1803, continuing war between France and Britain seemed unavoidable.

France turned New Orleans over on December 20, 1803 at The Cabildo.

The territory's boundaries had not been defined in the 1762 Treaty of Fontainebleau that ceded it from France to Spain, nor the 1800 Third Treaty of San Ildefonso ceding it back to France, nor the 1803 Louisiana Purchase agreement ceding it to the United States.

Category: 1803 in France

* 1803 – Napoleonic Wars: The United Kingdom revokes the Treaty of Amiens and declares war on France.

Biot's study, initiated by the French Academy of Sciences, was compelled by a meteorite fall of thousands of meteorites on April 26, 1803 from the skies of L ' Aigle, France.

The extreme northeastern part of New Mexico was originally ruled by France, and sold to the United States as part of the Louisiana Purchase in 1803.

Elected president in what Jefferson called the Revolution of 1800, he oversaw the purchase of the vast Louisiana Territory from France ( 1803 ), and sent the Lewis and Clark Expedition ( 1804 – 1806 ) to explore the new west.

After sending more than 20, 000 troops to try to regain the colony in 1802, France withdrew its 7, 000 surviving troops in late 1803, shortly before Haiti declared independence.

On December 20, 1803 the French flag was lowered in New Orleans and the U. S. flag raised, symbolizing the transfer of the Louisiana territory from France to the United States.

* The modern rose is born, with the introduction of Rosa ' La France ' by Jean-Baptiste Guillot ( 1803 – 1882 ).

First, its left bank territories were occupied, and then annexed, by France starting in 1795 ; then, in 1803, its right bank territories were taken by the Margrave of Baden.