From 1820 San Francisquito Canyon and San Francisquito Pass was part of the route of the El Camino Viejo.

Several other alkaloids were discovered around that time, including xanthine ( 1817 ), atropine ( 1819 ), caffeine ( 1820 ), coniine ( 1827 ), nicotine ( 1828 ), colchicine ( 1833 ), sparteine ( 1851 ), and cocaine ( 1860 ).

In 1820 the city wall was torn down, with the exception of the individual towers and gates, and the defensive ditches were filled in.

Therefore, by the end of the decade, some Cubans were inspired by the successes of Simón Bolívar, despite the fact that the Spanish Constitution was restored in 1820.

The opening of the Sankey Canal in 1757, followed by the Bridgewater Canal in 1761, which halved the price of coal in Liverpool and Manchester England, respectively, triggered a period of " canal mania " in Britain so that between 1760 and 1820 over one hundred canals were built.

When the whaleship Essex was rammed and sunk by a whale in 1820, the captain opted to sail 3000 miles upwind to Chile rather than 1400 miles downwind to the Marquesas because he had heard the Marquesans were cannibals.

In 1784, the two provinces were divided ; Nova Scotia was split into Nova Scotia, Cape Breton Island ( rejoined to Nova Scotia in 1820 ), Prince Edward Island, and New Brunswick, while Quebec was split into Lower Canada ( southern Quebec ) and Upper Canada ( southern through lower northern Ontario ).

The Ilois, now called Chagos Islanders or Chagossians since the late 1990s, were descended primarily from slaves brought to the island from Madagascar by the French between 1793 and 1810, and Malay slaves from the slave market on Pulo Nyas, an island off the northwest coast of Sumatra, from around 1820 until the slave trade ended following the Slavery Abolition Act of 1833.

ET, in turn, can now be seen ( in light of modern results ) as close to the average mean solar time between 1750 and 1890 ( centered on 1820 ), because that was the period during which the observations on which Newcomb's tables were based were performed.

The birth of native Estonian literature was in 1810 to 1820 when the patriotic and philosophical poems by Kristjan Jaak Peterson were published.

In 1820, an expedition intended for the colonies ( which, at the time, were on the verge of being lost themselves, to rebels and the Monroe Doctrine ) revolted in Cadiz.

The tumultuous three years of liberal rule that followed ( 1820 – 1823 ) were marked by various absolutist conspiracies.

There were, however, also moves towards reunion, beginning with the unification of some secessionist churches into the United Secession Church in 1820, which united with the Relief Church in 1847 to form the United Presbyterian Church, which in turn joined with the Free Church in 1900 to form the United Free Church of Scotland.

After Hugh Macdonald's business ventures left him in debt, the family emigrated to Kingston, in Upper Canada ( today the southern and eastern portions of Ontario ), in 1820, where there were already a number of Macdonald relatives and connections.

In 1819 – 1820, Johann Baptist von Spix and Carl Friedrich Philipp von Martius were engaged in an expedition to Brazil, and on their return to Europe, amongst other collections of natural objects they brought home an important set of the fresh water fish of Brazil, and especially of the Amazon River.

The islands were named after the first in the Russian ( Krusenstern ) and French ( Duperrey ) maps ( 1820 ), later in the English maps.

Although muster rolls were prepared as late as 1820, the element of compulsion was abandoned, and the militia was transformed into a volunteer force.

But the real improvements in the nail-making process occurred between 1790 and 1820, in the United States and England, when various machines were invented to automate and speed up the process of making nails from bars of wrought iron.

They sent pianos to both Joseph Haydn and Ludwig van Beethoven, and were the first firm to build pianos with a range of more than five octaves: five octaves and a fifth during the 1790s, six octaves by 1810 ( Beethoven used the extra notes in his later works ), and seven octaves by 1820.

However, after many clashes between liberal deputies and conservative government officials, sessions were later called only four times ( 1818, 1820, 1826, and 1830, with the last two sessions being secret ).

Tuning forks used by orchestras between 1750 and 1820 mostly had a frequency of A = 423. 5 Hz, although there were many forks and many slightly different pitches.

His theoretical and observational work provided the foundation for modern binary star astronomy ; new catalogues adding to his work were not published until after 1820 by Friedrich Wilhelm Struve, James South and John Herschel.

So it is very likely they were visiting Zambian territory between 1720 and 1820.

Two states were admitted to the union during this decade: Maine in 1820, and Missouri in 1821.

1795 – 1820 ( with their relatively unconfining empire silhouette ) and re-adopted elements that had been characteristic of most of the 18th century ( and were to be characteristic of the remainder of the 19th century ), such as full skirts and clearly visible corseting of the natural waist.

Maine was part of the Commonwealth of Massachusetts until 1820, when it voted to secede from Massachusetts.

* 1820 – An 80-ton sperm whale attacks the Essex ( a whaling ship from Nantucket, Massachusetts ) 2, 000 miles from the western coast of South America ( Herman Melville's 1851 novel Moby-Dick is in part inspired by this story ).

The decrease was brought about by the Missouri Compromise of 1820, which made the region of Maine — long part of Massachusetts — a free state to balance the pending admission of slave state Missouri.

As part of the " Great Triumvirate " or " Immortal Trio ," along with his colleagues Daniel Webster and John C. Calhoun, he was instrumental in formulating the Missouri Compromise of 1820 and the Compromise of 1850.

The eastern Sahel ( the part in what is now Sudan ) did not fall to the European powers but was annexed by Muhammad Ali of Egypt in 1820.

Ultimately Hardy County in 1785 and part of Morgan County in 1820 were formed from Hampshire County.

Perry County, originally part of Cumberland County, was created in 1820 in part because residents did not want to travel over the mountain to Carlisle ( the county seat of Cumberland County ).

Paulding County was organized by the legislature on April 1, 1820 from lands that were formerly part of Williams County.

The county was organized November 16, 1820, from part of Howard County.

Counties later formed all or in part from Clark County were: Crawford ( 1818 ), Decatur ( 1822 ), Fayette ( 1819 ), Floyd ( 1819 ), Franklin ( 1811 ), Harrison ( 1808 ), Jackson ( 1816 ), Jefferson ( 1811 ), Jennings ( 1817 ), Randolph ( 1818 ), Ripley ( 1816 ), Rush ( 1822 ), Scott ( 1820 ), Switzerland ( 1814 ), Union ( 1821 ), Washington ( 1814 ), and Wayne ( 1811 ).

* Anna Sewell ( 1820 – 78 ), author of Black Beauty born and spent early part of life in Great Yarmouth

By making them in longer lengths, a reduction was effected in the number of joints, always the weakest part of the line ; and another advance consisted in the substitution of wrought iron for cast iron, though that material did not gain wide adoption until after the patent for an improved method of rolling rails granted in 1820 to John Birkinshaw, of the Bedlington Ironworks, Northumberland.

In 1820 a scandal broke, when a cartoon was published showing a half dressed King George IV embracing Nash's wife with a speech bubble coming from the King's mouth containing the words " I have great pleasure in visiting this part of my dominions ".

* The provisions of the Act of 1820, known as the Missouri Compromise, were voided as a legislative act, since the act exceeded the powers of Congress, insofar as it attempted to exclude slavery and impart freedom and citizenship to non-white persons in the northern part of the Louisiana Purchase.

The community was incorporated as Lawrence in 1820 by the Court of Franklin County ( of which it was then a part ) but renamed Lawrenceburg in 1827.

On June 28, 1820, Oakland County was divided into two townships: Pontiac Township and Bloomfield Township, the latter covering the southern part of the county that would include West Bloomfield Township, Royal Oak and Southfield.

The town was incorporated in 1820 from part of the town of Bergen.

The village was founded in the early part of the 18th Century, but became known as Unionville around 1820.

The name was briefly changed to “ Orange ” when the town of Waterford was created in 1816 from part of Halfmoon, but the current name was restored in 1820.

The Town of Hornellsville was formed from part of the Town of Canisteo in 1820.

By 1820, Baily had already taken a leading part in the foundation of the Royal Astronomical Society, and its Gold Medal was awarded him, in 1827, for his preparation of the Society's Catalogue of 2881 stars ( Memoirs R. Astr.

In 1820, the Baron of Minotuli acquired several mummy portraits for a German collector, but they became part of a whole shipload of Egyptian artifacts lost in the North Sea.

Only the first part of his Examen critique des dictionnaires historiques ( 1820 ) was published.

He was born on 29 September 1820, in the Pavillon de Marsan, part of the Tuileries Palace which still survives in the Louvre in Paris.