The work of Henri Braconnot in 1777 and the work of Christian Schönbein in 1846 led to the discovery of nitrocellulose, which, when treated with camphor produced celluloid.

French chemist Paul Vieille had followed the findings of German-Swiss chemist Christian Friedrich Schonbein, who had created the explosive nitrocellulose or " guncotton " in 1846 by treating cotton fibers with a nitric acid and sulphuric acid mixture.

Alcott's opposition to slavery also fueled his opposition to the Mexican – American War which began in 1846.

Work was also progressing on the northern half of the West Wing ( The Egyptian Sculpture Gallery ) 1826 – 1831, with Montagu House demolished in 1842 to make room for the final part of the West Wing, completed in 1846, and the South Wing with its great colonnade, initiated in 1843 and completed in 1847, when the Front Hall and Great Staircase were opened to the public.

He also helped found the Irwin & Agnew Iron Foundry in 1846.

Sir Charles FitzRoy ( Governor of New South Wales from 1846 – 1855 ) and Sir William Denison ( Governor of New South Wales from 1855 – 1861 ) also carried the additional title of Governor-General because their jurisdiction extended to other colonies in Australia.

His grandson, also named Henry ( 1770 – 1846 ), had a long career in politics.

The Batallón de San Patricio, a battalion of U. S. troops who deserted and fought alongside the Mexican Army against the United States in the Mexican-American War of 1846 to 1848, is also famous in Mexican history.

Earlier, in 1780, after the death of Ranjit Deo, the Raja of Jammu, the kingdom of Jammu ( to the south of the Kashmir valley ) was also captured by the Sikhs and afterwards, until 1846, became a tributary to the Sikh power.

Zíbrt also ironically dismisses the etymology suggested by A. Fähnrich ( in Ein etymologisches Taschenbuch, Jiein, 1846 ) that it derives from the Bohemian word pole, i. e., " field ".

Great Britain also colonized the west coast of North America, indirectly via the Hudson's Bay Company licenses west of the Rocky Mountains, the Columbia and New Caledonia fur districts, most of which were jointly claimed as the Oregon Country by the United States from 1818 until the 49th parallel was established as the international boundary west of the Rockies by the Oregon Treaty of 1846.

Poweshiek County is also home to Grinnell College, a small liberal arts college founded in 1846.

Between 1835 and 1846, the Republic of Kraków also issued a currency, the Kraków złoty

The massacre, led by Jakub Szela ( born in Smarżowa ), is also known as the Galician Massacre, and began on February 18, 1846.

The town was also the site of the first Roman Catholic Archdiocese in the western United States, founded in 1846.

) When Polk moved to terminate the joint occupation agreement, the British finally agreed to divide the region along the 49th parallel in early 1846, keeping the lower Columbia basin as part of the United States, and the dispute was settled by the Oregon Treaty of 1846, which the administration was able to sell to congress because the United States was about to begin the Mexican-American war, and the president and others argued it would be foolish to also fight the British Empire.

In 1846, with the arrival of USS Congress, Frémont was appointed lieutenant colonel of the California Battalion, also called U. S. Mounted Rifles, which he had helped form with his survey crew and volunteers from the Bear Flag Republic, now totaling 428 men.

He was also the author of English Etymologies ( 1846 ).

Vicenza railway station, opened in 1846, forms part of the Milan – Venice railway, and is also a junction of two branch lines, to Schio and Treviso, respectively.

Shrewsbury commissioned him to build St. Giles ' Catholic Church, Cheadle, completed in 1846, and Pugin was also responsible for designing the oldest Catholic church in Shropshire, St Peter and Paul at Newport,

Founded in 1846 as the University at Lewisburg, Bucknell traces its origination to a group of Baptists from White Deer Valley Baptist Church who deemed it " desirable that a Literary Institution should be established in Central Pennsylvania, embracing a High School for male pupils, another for females, a College and also a Theological Institution.

Roseland Cottage, also known as the Pink House or the Bowen House, was a summer home built by wealthy businessman Henry C. Bowen in 1846.

It is named after John Ernest Donalson ( 1846 – 1920 ), also known as Jonathan or John E. Donalson, a prominent businessman of the area.

About 1846, Sarpy also set up a ferry between Bellevue and St. Mary's, Iowa.

West Amwell Township was incorporated as a township by an Act of the New Jersey Legislature on April 6, 1846, when Amwell Township was split, also creating East Amwell Township at the same time.

Writing the rules didn't help the Knickerbockers in the first known competitive game between two clubs under the new rules, played at Elysian Fields in Hoboken, New Jersey on June 19, 1846.

The best known of these cases were the Maynooth grant in 1845 and the repeal of the Corn Laws in 1846.

August Wilhelm's Vienna lectures on dramatic art and literature went through four editions between 1809 and 1846 and, in them, he opined that Euripides " not only destroyed the external order of tragedy but missed its entire meaning ," a view that came to influence Friedrich Nietzsche, who however seems not to have known the Euripidean plays at all well.

Smith found that the 1826 letter by James Curtis cited by Dunn and others as the first known use of the term was actually written in 1846, and a 1827 diary entry by Sandford and Son ( published in a newspaper in 1859 ) was likely an editorial comment and not from the original diary.

On June 28, 1846, Berreyesa's father, José de los Reyes Berreyesa, an elderly man, crossed the San Francisco Bay and landed near the area known as San Quentin with two cousins, twin sons of Francisco de Haro, who were 19 years old, to visit his own sons in jail.

The Navajo signed a treaty, known as the Bear Spring Treaty, on November 21, 1846.

Following the Mexican-American War, from 1846 – 1848 and the Treaty of Guadalupe Hidalgo in 1848, Mexico ceded its mostly unsettled northern holdings, today known as the American Southwest and California, to the United States of America.

* 1846 – Two French shepherd children, Mélanie Calvat and Maximin Giraud, experience a Marian apparition on a mountaintop near La Salette, France, now known as Our Lady of La Salette.

File: White House 1846. jpg | Earliest known photograph of the White House, taken c. 1846 by John Plumbe during the administration of James K. Polk.

In 1846, the earliest large-scale engagement of the Mexican-American War took place in the city, known as the Battle of Monterrey.

The oldest and best known tourist attraction at Niagara Falls is the Maid of the Mist boat cruise, named for an ancient Ongiara Indian mythical character, which has carried passengers into the rapids immediately below the falls since 1846.

In 1846, white American settlers took over the town in what has come to be known as the " Bear Flag Revolt.

Graham's law, known as Graham's law of effusion, was formulated by Scottish physical chemist Thomas Graham in 1846.

The county is officially held to be named for John White ( 1751 – 1846 ), a Revolutionary War soldier, surveyor, and frontiersman who was the first known white settler of the area.

Charles Piazzi Smyth ( 3 January 1819 – 21 February 1900 ), was Astronomer Royal for Scotland from 1846 to 1888, well known for many innovations in astronomy and his pyramidological and metrological studies of the Great Pyramid of Giza.

Between 1877 and 1879, Benjamin " Pap " Singleton, a former slave who escaped to freedom in 1846, staked out a settlement in Morris County for freedmen known as " Exodusters ".

Sutter Creek, known as the " Jewel of the Mother Lode ," was named after John Sutter, who sent a party to the area in 1846 in search of timber.

As the area became colonized by the Spanish and later fell under Mexican jurisdiction, the land of the San Vicente Valley became a part of the Mexican land-grant known as Rancho Cañada de San Vicente y Mesa del Padre Barona in 1846.

Sonoma is known as the birthplace of American California, for it was in this town plaza that the Bear Flag Revolt took place and a Bear Flag was first raised on June 14, 1846.

This settlement became known as " Manlius " and a post office opened in July 1846.