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Rouelle D Or Balesme Haute Marne.jpg
The word rouelle can refer to: Things *A yellow badge that Jews were forced to wear as an identifying mark when living under hostile regimes, especially in Nazi Germany *Pont Rouelle The Pont Rouelle (English: Rouelle Bridge) is a railway bridge in Paris that crosses the river Seine. It connects the city's 15th and 16th arrondissements, and passes through the Île aux Cygnes Île aux Cygnes (; en, Isle of the Swans) is ..., a bridge in Paris People * Guillaume-François Rouelle, French chemist who proposed the concept of a base * Hilaire Rouelle, younger brother of above, French chemist who discovered urea Places * Rouelles, a French ''commune'' in the Haute-Marne ''département'' of the Champagne-Ardenne region {{Disambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yellow Badge
Yellow badges (or yellow patches), also referred to as Jewish badges (german: Judenstern, lit=Jew's star), are badges that Jews were ordered to wear at various times during the Middle Ages by some caliphates, at various times during the Medieval and early modern period by some European powers, and from 1939 to 1945 by the Axis powers, including Nazi Germany. The badges served to mark the wearer as a religious or ethnic outsider, and often served as a badge of shame. Usage Caliphates The practice of wearing special clothing or markings to distinguish Jews and other non-Muslims ( dhimmis) in Muslim-dominated countries seems to have been introduced in the Umayyad Caliphate by Caliph Umar II in the early 8th century. The practice was revived and reinforced by the Abbasid caliph al-Mutawakkil (847–861), subsequently remaining in force for centuries. A genizah document from 1121 gives the following description of decrees issued in Baghdad: Medieval and early modern Europe In l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pont Rouelle
The Pont Rouelle (English: Rouelle Bridge) is a railway bridge in Paris that crosses the river Seine. It connects the city's 15th and 16th arrondissements, and passes through the Île aux Cygnes Île aux Cygnes (; en, Isle of the Swans) is a small artificial island on the river Seine in Paris, France, in the 15th arrondissement. It was created in 1827 to protect the bridge named the pont de Grenelle. It should not be confused with an .... Constructed of steel, the bridge is 173 metres (567 feet) long and 20 metres (66 feet) wide. It is currently used for railway service, carrying the RER C. Structure It is composed of four distinct portions: * On the Rive Droite, Right Bank, an arch in masonry spans the bank road. * The portion that spans the right arm of the Seine consists of a single metal arch. * The part which crosses the Île aux Cygnes spans the island's pedestrian alley with a small stone arch. * The part which spans the left arm of the river, reaching th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Guillaume-François Rouelle
Guillaume François Rouelle (, 15 September 1703 – 3 August 1770) was a French chemist and apothecary. In 1754 he introduced the concept of a base into chemistry as a substance which reacts with an acid to form a salt). He is known as ''l'Aîné'' (the elder) to distinguish him from his younger brother, Hilaire Rouelle, who was also a chemist and known as the discoverer of urea. He started a public course in his laboratory in 1738 where he taught many students among whom were Denis Diderot, Antoine-Laurent de Lavoisier, Joseph Proust and Antoine-Augustin Parmentier. He was elected a foreign member of the Royal Swedish Academy of Sciences in 1749. Why bases for neutral salts were called bases The modern meaning of the word "base" and its general introduction into the chemical vocabulary are usually attributed to the French chemist, Guillaume-François Rouelle (1703–1770), who used the term "Base" in a memoir on salts written in 1754 (see The Origin of the Term "Base" by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hilaire Rouelle
Hilaire Marin Rouelle (15 February 1718 – 7 April 1779) was an 18th-century French chemist. Commonly cited as the 1773 discoverer of urea, he was not the first to do so. Dutch scientist Herman Boerhaave had discovered this chemical A chemical substance is a form of matter having constant chemical composition and characteristic properties. Some references add that chemical substance cannot be separated into its constituent elements by physical separation methods, i.e., w ... as early as 1727. Rouelle is known as "le cadet" (the younger) to distinguish him from his older brother, Guillaume-François Rouelle, who was also a chemist. References 1718 births 1779 deaths People from Mathieu, Calvados 18th-century French chemists Members of the Royal Spanish Academy {{france-chemist-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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