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René Dagron
René Prudent Patrice Dagron (17 March 1817 – 13 June 1900) was a French photographer and inventor. He was born in Aillières-Beauvoir, Sarthe, France.CHRONOLOGY OF MICROFILM DEVELOPMENTS 1800 – 1900 from UCLA On 21 June 1859, Dagron was granted the first in history. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Collodion
Collodion is a flammable, syrupy solution of nitrocellulose in Diethyl ether, ether and Alcohol (chemistry), alcohol. There are two basic types: flexible and non-flexible. The flexible type is often used as a surgical dressing or to hold dressings in place. When painted on the skin, collodion dries to form a flexible nitrocellulose film. While it is initially colorless, it discolors over time. Non-flexible collodion is often used in theatrical make-up. Collodion was also the basis of most Collodion process, wet-plate photography until it was superseded by modern gelatin emulsions. History In 1846, Louis-Nicolas Ménard and Florès Domonte discovered that cellulose nitrate could be dissolved in diethyl ether, ether. They devised a mixture of ether as the solvent and ethanol as a diluent that rendered cellulose nitrate into a clear gelatinous liquid. Collodion was first used medically as a dressing in 1847 by the Boston physician John Parker Maynard. The solution was dubbed "collodi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Government Of National Defense
The Government of National Defense () was the first government of the Third Republic of France from 4 September 1870 to 13 February 1871 during the Franco-Prussian War. It was formed after the proclamation of the Republic in Paris on 4 September, which in turn followed the surrender and capture of Emperor Napoleon III by the Prussians at the Battle of Sedan. The government, headed by General Louis Jules Trochu, was under Prussian siege in Paris. Breakouts were attempted twice, but met with disaster and rising dissatisfaction of the public. In late January the government, having further enraged the population of Paris by crushing a revolutionary uprising, surrendered to the Prussians. Two weeks later, it was replaced by the new government of Adolphe Thiers, which soon passed a variety of financial laws in an attempt to pay reparations and thus oblige the Prussians to leave France, leading to the outbreak of revolutions in French cities, and the ultimate creation of the Paris Com ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magic Lantern
The magic lantern, also known by its Latin name , is an early type of image projector that uses pictures—paintings, prints, or photographs—on transparent plates (usually made of glass), one or more lens (optics), lenses, and a light source. Because a single lens inverts an image projected through it (as in the phenomenon which inverts the image of a camera obscura), slides are inserted upside down in the magic lantern, rendering the projected image correctly oriented. It was mostly developed in the 17th century and commonly used for entertainment purposes. It was increasingly used for education during the 19th century. Since the late 19th century, smaller versions were also mass-produced as toys. The magic lantern was in wide use from the 18th century until the mid-20th century when it was superseded by a compact version that could hold many 35 mm photographic slides: the slide projector. Technology Apparatus The magic lantern used a concave mirror behind a light so ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gram
The gram (originally gramme; SI unit symbol g) is a Physical unit, unit of mass in the International System of Units (SI) equal to one thousandth of a kilogram. Originally defined in 1795 as "the absolute Mass versus weight, weight of a volume of pure water equal to Cube (algebra), the cube of the hundredth part of a metre [1 Cubic centimetre, cm3], and at Melting point of water, the temperature of Melting point, melting ice", the defining temperature (0 °C) was later changed to the temperature of maximum density of water (approximately 4 °C). Subsequent redefinitions agree with this original definition to within 30 Parts-per notation, parts per million (0.003%), with the maximum density of water remaining very close to 1 g/cm3, as shown by modern measurements. By the late 19th century, there was an effort to make the Base unit (measurement), base unit the kilogram and the gram a derived unit. In 1960, the new International System of Units defined a '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
French Language
French ( or ) is a Romance languages, Romance language of the Indo-European languages, Indo-European family. Like all other Romance languages, it descended from the Vulgar Latin of the Roman Empire. French evolved from Northern Old Gallo-Romance, a descendant of the Latin spoken in Northern Gaul. Its closest relatives are the other langues d'oïl—languages historically spoken in northern France and in southern Belgium, which French (Francien language, Francien) largely supplanted. It was also substratum (linguistics), influenced by native Celtic languages of Northern Roman Gaul and by the Germanic languages, Germanic Frankish language of the post-Roman Franks, Frankish invaders. As a result of French and Belgian colonialism from the 16th century onward, it was introduced to new territories in the Americas, Africa, and Asia, and numerous French-based creole languages, most notably Haitian Creole, were established. A French-speaking person or nation may be referred to as Fra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
French Franc
The franc (; , ; currency sign, sign: F or Fr), also commonly distinguished as the (FF), was a currency of France. Between 1360 and 1641, it was the name of coins worth 1 livre tournois and it remained in common parlance as a term for this amount of money. It was reintroduced (in French livre, decimal form) in 1795. After two centuries of inflation, it was Redenomination, redenominated in 1960, with each (NF) being worth 100 old francs. The NF designation was continued for a few years before the currency returned to being simply the franc. Many French residents, though, continued to quote prices of especially expensive items in terms of the old franc (equivalent to the new centime), up to and even after the introduction of the euro (for coins and banknotes) in 2002. The French franc was a commonly held international reserve currency of reference in the 19th and 20th centuries. Between 1998 and 2002, the conversion of francs to euros was carried out at a rate of 6.55957 franc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carrier Pigeons
The homing pigeon is a variety of domestic pigeon (''Columba livia domestica''), selectively bred for its ability to find its way home over extremely long distances. Because of this skill, homing pigeons were used to carry messages, a practice referred to as "pigeon post". Until the introduction of telephones, they were used commercially to deliver communication; when used during wars, they were called "war pigeons". The homing pigeon is also called a mail pigeon or messenger, and colloquially a homer. Perhaps most commonly, the homing pigeon is called a carrier pigeon; this nomenclature can be confusing, though, since it is distinct from the English carrier, an ancient breed of fancy pigeon. Modern-day homing pigeons do have English carrier blood in them because they are in part descendants of the old-style carriers. The domestic pigeon is derived from the wild rock dove (''Columba livia'' sspp.); the rock dove has an innate homing ability, meaning that it will generally retu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siege Of Paris (1870–1871)
The siege of Paris took place from 19 September 1870 to 28 January 1871 and ended in the capture of the city by forces of the various states of the North German Confederation, led by the Kingdom of Prussia. The siege was the culmination of the Franco-Prussian War, which saw the Second French Empire attempt to reassert its dominance over continental Europe by declaring war on the North German Confederation. The Prussian-dominated North German Confederation had recently emerged victorious in the Austro-Prussian War of 1866, which led to the questioning of France's status as the dominant power of continental Europe. With a declaration of war by the Corps législatif, French parliament on 16 July 1870, Imperial France soon faced a series of defeats at German hands over the following months, leading to the Battle of Sedan, which, on 2 September 1870, saw a decisive defeat of French forces and the capture of the French emperor, Napoleon III. With the capture of Napoleon III, the Second ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Queen Victoria
Victoria (Alexandrina Victoria; 24 May 1819 – 22 January 1901) was Queen of the United Kingdom of Great Britain and Ireland from 20 June 1837 until Death and state funeral of Queen Victoria, her death in January 1901. Her reign of 63 years and 216 days, which was List of monarchs in Britain by length of reign, longer than those of any of her predecessors, constituted the Victorian era. It was a period of industrial, political, scientific, and military change within the United Kingdom of Great Britain and Ireland, United Kingdom, and was marked by a great expansion of the British Empire. In 1876, the British parliament voted to grant her the additional title of Empress of India. Victoria was the daughter of Prince Edward, Duke of Kent and Strathearn (the fourth son of King George III), and Princess Victoria of Saxe-Coburg-Saalfeld. After the deaths of her father and grandfather in 1820, she was Kensington System, raised under close supervision by her mother and her Comptrol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1862 International Exhibition
The International Exhibition of 1862, officially the London International Exhibition of Industry and Art, also known as the Great London Exposition, was a world's fair held from 1 May to 1 November 1862 in South Kensington, London, England. The site now houses museums including the Natural History Museum, London, Natural History Museum and the Science Museum (London), Science Museum. Background and overview After the Great Exhibition, held in 1851, had proven to be a huge success, the British Government planned another world's fair, international exhibition that would surpass both this one and the 1855 Paris Exposition, larger in both size and scale. The intention was to showcase the advances which had since been made in industry, technology, and arts. It was intended to be held in 1861, but was delayed owing to various international events, including the Italian War of Independence and American Civil War (which caused a shortage of cotton, among other things). The exposition, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
