The light beam from the lamp was filtered through a half-standard thickness Corning 1840 filter.

In 1840, Lincoln became engaged to Mary Todd, who was from a wealthy slave-holding family in Lexington, Kentucky.

William Baker Ashton was appointed Governor of the temporary goal in 1839, and in 1840 George Strickland Kingston was commissioned to design Adelaide's new Gaol.

In 1840 Johnson was appointed as a presidential elector for his state, giving him more statewide exposure.

François-Auguste-René Rodin ( 12 November 1840 – 17 November 1917 ), known as Auguste Rodin ( ; ), was a French sculptor.

Rodin was born in 1840 into a working-class family in Paris, the second child of Marie Cheffer and Jean-Baptiste Rodin, who was a police department clerk.

A declaration of independence was officially issued by Chile on February 12, 1818 and formally recognized by Spain in 1840, when full diplomatic relations were established.

The defeat by the British Empire in the First Opium War ( 1840 ) led to the Treaty of Nanjing ( 1842 ), under which Hong Kong was ceded and opium import was legitimized.

From October 1840 until January 1843 he was in Paris, busy with the treasures of the Bibliothèque Nationale, eking out his scanty means by making collations for other scholars, and producing for the publisher, Firmin Didot, several editions of the Greek New Testament — one of them exhibiting the form of the text corresponding most closely to the Vulgate.

Claude Monet was born on 14 November 1840 on the 5th floor of 45 rue Laffitte, in the 9th arrondissement of Paris.

The Detroit Curling Club was started in 1840 when Michigan only had a population of 212, 000 and had only been in the Union for three years.

The phrase caste system was first recorded in 1840.

However, Mrs. Gaugain, in her 1840 The Lady's Assistant for Executing Useful and Fancy Designs in Knitting, Netting, and Crotchet Work, refers to " Tambour, or Crotchet ," then proceeds to call it " tambour " in all the instructions, indicating a strong connection believed in at the time of crochet's beginning, and that it was, perhaps, the older name.

The first cable-operated railway, employing a moving rope and iron claws on the cars, was the London and Blackwall Railway, which opened in east London, England, in 1840.

In France, the first Christmas tree was introduced in 1840 by the duchesse d ' Orléans.

The first official attempt was the 1840 census which used a single category, " idiocy / insanity ".

This continued down to 1840 when the Barony of Dublin City was separated from the Barony of Dublin.

Because the margin of victory was so close a third election in the summer of 1840 was held.

The Shihab leadership continued until the middle of the 19th century and culminated in the illustrious governorship of Amir Bashir Shihab II ( 1788 – 1840 ) who, after Fakhr-al-Din, was the most powerful feudal lord Lebanon produced.

The Maronite-Druze conflict in 1840 – 60 was an outgrowth of the Maronite Christian independence movement, directed against the Druze, Druze feudalism, and the Ottoman-Turks.

He was the second son of five children born to David Longfield Beatty ( 1840 − 1904 ) and Katherine ( or Katrine ) Edith Sadleir ( 1840 − 1896 ), both from Ireland.

He then studied law at Transylvania University in Lexington and was admitted to the bar in 1840.

Toombs was admitted to the bar in 1830, and served in the Georgia House of Representatives ( 1838, 1840 – 1841, and 1843 – 1844 ).

Soon after he was admitted Privatdozent, and in 1830 was appointed extraordinary and in 1840 ordinary professor of Old Indian language and literature.

Having decided to practice law, he enrolled at Harvard Law School in 1840 and was admitted to the bar two years later.

Upon returning to Skaneateles in 1840, he studied law, was admitted to the bar in 1842, and commenced practice in Eaton Rapids, Michigan in 1843.

He graduated from there in 1837 and was admitted to the bar in 1840.

Charles Biddle graduated from Princeton in 1837, where he studied law, and was admitted to the bar in 1840.

After studying at the University of Virginia, Randolph " read the law " with an established firm and was admitted to the bar in 1840.

The son of Amos Lane, Lane was born in Lawrenceburg, Indiana, where he practiced law when he was admitted to the bar in 1840.

Having graduated from Yale in 1837, Pierrepont studied law and was admitted to the bar in 1840.

Born in Cincinnati, Dennison graduated from Miami University, studied law, and was admitted to the Ohio bar in 1840.

He was admitted to the Massachusetts bar in 1840, began practice at Lowell, and soon attained distinction as a lawyer, particularly in criminal cases.

He graduated at Harvard College in 1838 and at the Harvard Law School in 1840, continued his law studies under his father, was admitted to the Massachusetts bar, and prepared two legal treatises of value — Treatise on the Law of Contracts not under Seal ( 2 vols., 1844 ) and Treatise on the Law of Sales of Personal Property ( 1847 ).

O ' Neal studied law with James W. McClung and was admitted to the bar in 1840.

He obtained a law degree from the University of Virginia in 1839 and was admitted to the bar in Alabama in 1840.

In 1840, Karl was admitted as a student of the Munich Academy, under the artists Karl Schorn and Julius Schnorr von Karolsfeld.

Hager studied law and was admitted to the bar in 1840, practicing in Morristown.

In 1840, Branch moved to Tallahassee, Florida and was admitted to the bar to practice law by a special act of the legislature.

He then studied law at Franklin College and was admitted to the bar in 1840, commencing practice in New Philadelphia, Ohio and eventually became district attorney for the surrounding Tuscarawas County, Ohio.

Fisher was admitted to the bar in 1840 and was elected to the Houston city council.

In 1837 he was admitted to Lincoln's Inn, and was called to the Bar in 1840.

Around 1840 he joined the English Freemasonry, and in October 1847 was admitted to Polish national lodge in London.

He came to Ohio as a young man, and was admitted to the bar at St. Clairsville in 1840.

He also studied law, and was admitted to the bar in 1840.