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1845 In Science
The year 1845 in science and technology involved some significant events, listed below. Astronomy * April – Lord Rosse discovers that the nebula M51 has a spiral structure. * September–October – Cornish mathematician John Couch Adams communicates to James Challis and George Biddell Airy his calculations demonstrating that a body (Neptune) is perturbing the orbit of Uranus. * November 10 – Urbain Le Verrier presents to the ''Académie des sciences'' in Paris a memoir showing that existing theories fail to account for the motion of Uranus. * Construction begins in Ireland of the "Leviathan of Parsonstown", a telescope built by Lord Rosse. Biology * August–September – Previously unknown Potato blight strikes the potato crop in Ireland: start of the Great Famine. Chemistry * March 17 – Stephen Perry patents the rubber band in England. * Edmond Frémy discovers the oxidizing agent Frémy's salt. Exploration * August – John Franklin's expedition with HMS ''Erebu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Science
Science is a systematic endeavor that builds and organizes knowledge in the form of testable explanations and predictions about the universe. Science may be as old as the human species, and some of the earliest archeological evidence for scientific reasoning is tens of thousands of years old. The earliest written records in the history of science come from Ancient Egypt and Mesopotamia in around 3000 to 1200 BCE. Their contributions to mathematics, astronomy, and medicine entered and shaped Greek natural philosophy of classical antiquity, whereby formal attempts were made to provide explanations of events in the physical world based on natural causes. After the fall of the Western Roman Empire, knowledge of Greek conceptions of the world deteriorated in Western Europe during the early centuries (400 to 1000 CE) of the Middle Ages, but was preserved in the Muslim world during the Islamic Golden Age and later by the efforts of Byzantine Greek scholars who brought Greek ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Potato
The potato is a starchy food, a tuber of the plant ''Solanum tuberosum'' and is a root vegetable native to the Americas. The plant is a perennial in the nightshade family Solanaceae. Wild potato species can be found from the southern United States to southern Chile. The potato was originally believed to have been domesticated by Native Americans independently in multiple locations,University of Wisconsin-Madison, ''Finding rewrites the evolutionary history of the origin of potatoes'' (2005/ref> but later genetic studies traced a single origin, in the area of present-day southern Peru and extreme northwestern Bolivia. Potatoes were domesticated there approximately 7,000–10,000 years ago, from a species in the ''Solanum brevicaule'' complex. Lay summary: In the Andes region of South America, where the species is indigenous, some close relatives of the potato are cultivated. Potatoes were introduced to Europe from the Americas by the Spanish in the second half of the 16 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Baffin Bay
Baffin Bay ( Inuktitut: ''Saknirutiak Imanga''; kl, Avannaata Imaa; french: Baie de Baffin), located between Baffin Island and the west coast of Greenland, is defined by the International Hydrographic Organization as a marginal sea of the Arctic Ocean. It is sometimes considered a sea of the North Atlantic Ocean. It is connected to the Atlantic via Davis Strait and the Labrador Sea. The narrower Nares Strait connects Baffin Bay with the Arctic Ocean. The bay is not navigable most of the year because of the ice cover and high density of floating ice and icebergs in the open areas. However, a polynya of about , known as the North Water, opens in summer on the north near Smith Sound. Most of the aquatic life of the bay is concentrated near that region. Extent The International Hydrographic Organization defines the limits of Baffin Bay as follows: History The area of the bay has been inhabited since BC. Around AD 1200, the initial Dorset settlers were replaced by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northwest Passage
The Northwest Passage (NWP) is the sea route between the Atlantic and Pacific oceans through the Arctic Ocean, along the northern coast of North America via waterways through the Canadian Arctic Archipelago. The eastern route along the Arctic coasts of Norway and Siberia is accordingly called the Northeast Passage (NEP). The various islands of the archipelago are separated from one another and from Mainland Canada by a series of Arctic waterways collectively known as the Northwest Passages, Northwestern Passages or the Canadian Internal Waters. For centuries, European explorers, beginning with Christopher Columbus in 1492, sought a navigable passage as a possible trade route to Asia, but were blocked by North, Central, and South America, by ice, or by rough waters (e.g. Tierra del Fuego). An ice-bound northern route was discovered in 1850 by the Irish explorer Robert McClure. Scotsman John Rae explored a more southerly area in 1854 through which Norwegian Roald Amundsen f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HMS Terror (1813)
HMS ''Terror'' was a specialised warship and a newly developed bomb vessel constructed for the Royal Navy in 1813. She participated in several battles of the War of 1812, including the Battle of Baltimore with the bombardment of Fort McHenry. She was converted into a polar exploration ship two decades later, and participated in George Back's Arctic expedition of 1836–1837, the successful Ross expedition to the Antarctic of 1839 to 1843, and Sir John Franklin's ill-fated attempt to force the Northwest Passage in 1845, during which she was lost with all hands along with . On 12 September 2016, the Arctic Research Foundation announced that the wreck of ''Terror'' had been found in Nunavut's Terror Bay, off the southwest coast of King William Island. The wreck was discovered south of the location where the ship was reported abandoned, and some from the wreck of HMS ''Erebus'', discovered in 2014. Early history and military service HMS ''Terror'' was a bomb ship built over ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HMS Erebus (1826)
HMS ''Erebus'' was a constructed by the Royal Navy in Pembroke dockyard, Wales, in 1826. The vessel was the second in the Royal Navy named after Erebus, the personification of darkness in Greek mythology. The 372-ton ship was armed with two mortars – one and one – and 10 guns. The ship took part in the Ross expedition of 1839–1843, and was abandoned in 1848 during the third Franklin expedition. The sunken wreck was discovered by the Canadian Victoria Strait expedition in September 2014. Ross expedition After two years' service in the Mediterranean Sea, ''Erebus'' was refitted as an exploration vessel for Antarctic service, and on 21 November 1840 – captained by James Clark Ross – she departed from Van Diemen's Land (now Tasmania) for Antarctica in company with HMS ''Terror''. In January 1841, the crews of both ships landed on Victoria Land, and proceeded to name areas of the landscape after British politicians, scientists, and acquaintances. Mount E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Franklin's Lost Expedition
Franklin's lost expedition was a failed British voyage of Arctic exploration led by Captain Sir John Franklin that departed England in 1845 aboard two ships, and , and was assigned to traverse the last unnavigated sections of the Northwest Passage in the Canadian Arctic and to record magnetic data to help determine whether a better understanding could aid navigation. The expedition met with disaster after both ships and their crews, a total of 129 officers and men, became icebound in Victoria Strait near King William Island in what is today the Canadian territory of Nunavut. After being icebound for more than a year ''Erebus'' and ''Terror'' were abandoned in April 1848, by which point Franklin and nearly two dozen others had died. The survivors, now led by Franklin's second-in-command, Francis Crozier, and ''Erebus''s captain, James Fitzjames, set out for the Canadian mainland and disappeared, presumably having perished. Pressed by Franklin's wife, Jane, and others, t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Franklin
Sir John Franklin (16 April 1786 – 11 June 1847) was a British Royal Navy officer and Arctic explorer. After serving in wars against Napoleonic France and the United States, he led two expeditions into the Canadian Arctic and through the islands of the Arctic Archipelago, in 1819 and 1825, and served as Lieutenant-Governor of Van Diemen's Land from 1839 to 1843. During his third and final expedition, an attempt to traverse the Northwest Passage in 1845, Franklin's ships became icebound off King William Island in what is now Nunavut, where he died in June 1847. The icebound ships were abandoned ten months later and the entire crew died, from causes such as starvation, hypothermia, and scurvy. Biography Early life Franklin was born in Spilsby, Lincolnshire, on , the ninth of twelve children born to Hannah Weekes and Willingham Franklin. His father was a merchant descended from a line of country gentlemen while his mother was the daughter of a farmer. One of hi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frémy's Salt
Frémy's salt is a chemical compound with the formula (K4 N(SO3)2sub>2), sometimes written as (K2 O(SO3)2. It a bright yellowish-brown solid, but its aqueous solutions are bright violet. The related sodium salt, disodium nitrosodisulfonate (NDS, Na2ON(SO3)2, CAS 29554-37-8) is also referred to as Frémy's salt. Regardless of the cations, the salts are distinctive because aqueous solutions contain the radical N(SO3)2sup>2−. Applications Frémy's salt, being a long-lived free radical, is used as a standard in electron paramagnetic resonance (EPR) spectroscopy, e.g. for quantitation of radicals. Its intense EPR spectrum is dominated by three lines of equal intensity with a spacing of about 13 G (1.3 mT). The inorganic aminoxyl group is a persistent radical, akin to TEMPO. It has been used in some oxidation reactions, such as for oxidation of some anilines and phenols allowing polymerization and cross-linking of peptides and peptide-based hydrogels. It can al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxidizing Agent
An oxidizing agent (also known as an oxidant, oxidizer, electron recipient, or electron acceptor) is a substance in a redox chemical reaction that gains or "Electron acceptor, accepts"/"receives" an electron from a (called the , , or ). In other words, an oxidizer is any substance that oxidizes another substance. The oxidation state, which describes the degree of loss of electrons, of the oxidizer decreases while that of the reductant increases; this is expressed by saying that oxidizers "undergo reduction" and "are reduced" while reducers "undergo oxidation" and "are oxidized". Common oxidizing agents are oxygen, hydrogen peroxide and the halogens. In one sense, an oxidizing agent is a chemical species that undergoes a chemical reaction in which it gains one or more electrons. In that sense, it is one component in an Redox, oxidation–reduction (redox) reaction. In the second sense, an oxidizing agent is a chemical species that transfers electronegative atoms, usually oxygen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edmond Frémy
Edmond Frémy (; 28 February 1814 – 3 February 1894) was a French chemist. He is perhaps best known today for Frémy's salt, a strong oxidizing agent which he discovered in 1845. Fremy's salt is a long-lived free radical that finds use as a standard in electron paramagnetic resonance spectroscopy. Life Frémy was born at Versailles, entered Joseph Louis Gay-Lussac's laboratory in 1831, and was employed at the École Polytechnique in 1834 and at the Collège de France in 1837. His next post was that of repetiteur at the École Polytechnique, where in 1846 he was appointed professor, and in 1850 he succeeded Gay-Lussac in the chair of chemistry at the Muséum national d'histoire naturelle, of which he later became director (1879–1891) after Michel Eugène Chevreul. He died in Paris. Work Frémy's work included investigations of osmic acid, the ferrates, stannates, plumbates, and other oxometallates, as well as ozone; attempts to obtain free fluorine by the electrolysis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
England
England is a country that is part of the United Kingdom. It shares land borders with Wales to its west and Scotland to its north. The Irish Sea lies northwest and the Celtic Sea to the southwest. It is separated from continental Europe by the North Sea to the east and the English Channel to the south. The country covers five-eighths of the island of Great Britain, which lies in the North Atlantic, and includes over 100 smaller islands, such as the Isles of Scilly and the Isle of Wight. The area now called England was first inhabited by modern humans during the Upper Paleolithic period, but takes its name from the Angles, a Germanic tribe deriving its name from the Anglia peninsula, who settled during the 5th and 6th centuries. England became a unified state in the 10th century and has had a significant cultural and legal impact on the wider world since the Age of Discovery, which began during the 15th century. The English language, the Anglican Church, and Engli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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