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Electric Candle
A Yablochkov candle (sometimes electric candle or Jablochkoff candle) is a type of electric carbon arc lamp, invented in 1876 by the Russian electrical engineer Pavel Yablochkov. Design A Yablochkov candle consists of a sandwich of two electrodes, which are long carbon rods, approximately 6 by 12 millimetres in cross-section, separated by a block of inert and insulating material such as plaster of Paris or kaolin. There is a small piece of fuse wire or carbon paste linking the two carbon rods at the top end. The assembly is mounted vertically into a suitable insulated holder. On application of the electric supply, the fuse wire "blows" and strikes the arc. The arc then continues to burn, gradually consuming the carbon electrodes and the intervening plaster, which melts at the same pace. The first candles were powered by a Gramme machine. The drawback of using direct current was that one of the rods would burn at twice the rate of the other. This problem was initially solved ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
London
London is the Capital city, capital and List of urban areas in the United Kingdom, largest city of both England and the United Kingdom, with a population of in . London metropolitan area, Its wider metropolitan area is the largest in Western Europe, with a population of 14.9 million. London stands on the River Thames in southeast England, at the head of a tidal estuary down to the North Sea, and has been a major settlement for nearly 2,000 years. Its ancient core and financial centre, the City of London, was founded by the Roman Empire, Romans as Londinium and has retained its medieval boundaries. The City of Westminster, to the west of the City of London, has been the centuries-long host of Government of the United Kingdom, the national government and Parliament of the United Kingdom, parliament. London grew rapidly 19th-century London, in the 19th century, becoming the world's List of largest cities throughout history, largest city at the time. Since the 19th cen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
La Nature
''La Nature'' (English: ''Nature'') was a French language magazine aimed at the popularization of science established in 1873 by French scientist and adventurer Gaston Tissandier. The magazine also received an enormous amount of time, effort, and contributions from his brother, Albert Tissandier. Evolution The beginning From 1873 to 1914, each year's volume started at the beginning of December. The second six-month period began with the first issue in June. Starting in 1915, ''La Natures publishing year was brought in sync with the calendar year. A weekly magazine until the 1920s, it became first fortnightly and then monthly in 1948. Second World War During the Second World War, ''La Nature'' was published only erratically. The first interruption in publishing lasted from September 15 to December 15, 1939, with only an additional six issues published during all of 1940. 1941 saw 12 issues published, on the 15th of each month. There were other suspensions in publication, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Exposition Of Electricity
The first International Exposition of Electricity () ran from 15 August 1881 through to 15 November 1881 at the Palais de l'Industrie on the Champs-Élysées in Paris, France. It served to display the advances in electrical technology since the small electrical display at the 1878 Universal Exposition.K. G. Beauchamp, '' Exhibiting electricity'' IET, 1997 , pp.160-165 Exhibitors came from the United Kingdom, United States, Germany, Italy and the Netherlands, as well as from France. As part of the exhibition, the first International Congress of Electricians presented numerous scientific and technical papers, including definitions of the standard practical units volt, ohm and ampere. History Adolphe Cochery, Minister of Posts and Telegraphs of the time, had initially suggested that an international exposition should be held. This show was a great stir. The public could admire the dynamo of Zénobe Gramme, the incandescent light, the théâtrophone (with stereophonic sound), th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
French Ironclad Amiral Duperré
''Amiral Duperré'' was an ironclad warship, ironclad barbette ship built for the French Navy in the 1870s and 1880s; she was the first vessel of that type built by France. She carried her main battery of four guns individually in open barbette mountings, which offered increased fields of fire compared to earlier central battery ships, though they were less well protected. ''Amiral Duperré'' was ordered as part of a French naval construction program aimed at countering the growth of the Italian fleet, which had begun work on the very large ironclads of the and es in the early 1870s. The Italian vessels, armed with guns, prompted public outcry in France that pressured the navy to develop larger guns for its own ships. ''Amiral Duperré''s design served as the basis for several follow-on classes, including the and es. The ship served with the Commander-in-Chief, Mediterranean (France), Mediterranean Squadron for most of her active career. In the 1880s and 1890s, the ship took ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Norodom Of Cambodia
Preah Norodom (, ; born Ang Voddey (, ); 3 February 1834 – 24 April 1904) was King of Cambodia from 19 October 1860 to his death on 24 April 1904. He was the eldest son of King Ang Duong and was a half-brother of Prince Si Votha and King Sisowath. He was elected to the throne in 1860 but would not be crowned until 1864 because Siam held the royal regalia (the royal crown and other artifacts). In 1863, he signed a treaty with France by giving France control over Cambodia's foreign relations in exchange for personal protection against his enemies. The treaty saved Cambodian independence, but French control over Cambodia's internal affairs strengthened continually until the end of his reign (full independence was not restored until 1953). His reign of is the longest in Cambodian history in terms of verifiable exact date. Upon his death, he was succeeded by his half-brother, Sisowath. He is the progenitor of the House of Norodom which has been the ruling royal house of Cam ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Naser Al-Din Shah Qajar
Naser al-Din Shah Qajar (; ; 17 July 1831 – 1 May 1896) was the fourth Shah of Qajar Iran from 5 September 1848 to 1 May 1896 when he was assassinated. During his rule there was internal pressure from the people of Iran, as well as external pressure from the British empire and the Russian empire. He granted many concessions, most importantly the Reuter concession and the Tobacco concession. He allowed the establishment of newspapers in the country and made use of modern forms of technology such as telegraph, photography and also planned concessions for railways and irrigation works. Despite his modernizing reforms on education, his tax reforms were abused by people in power, and the government was viewed as corrupt and unable to protect commoners from abuse by the upper classes which led to increasing anti-governmental sentiments. He was assassinated when visiting a shrine in Rayy near Tehran. He was the first modern Iranian monarch who formally visited Europe and wrote of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chennai
Chennai, also known as Madras (List of renamed places in India#Tamil Nadu, its official name until 1996), is the capital city, capital and List of cities in Tamil Nadu by population, largest city of Tamil Nadu, the southernmost states and territories of India, state of India. It is located on the Coromandel Coast of the Bay of Bengal. According to the 2011 Census of India, 2011 Indian census, Chennai is the List of most populous cities in India, sixth-most-populous city in India and forms the List of million-plus urban agglomerations in India, fourth-most-populous urban agglomeration. Incorporated in 1688, the Greater Chennai Corporation is the oldest municipal corporation in India and the second oldest in the world after City of London Corporation, London. Historically, the region was part of the Chola dynasty, Chola, Pandya dynasty, Pandya, Pallava dynasty, Pallava and Vijayanagara Empire, Vijayanagara kingdoms during various eras. The coastal land which then contained th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calcutta
Kolkata, also known as Calcutta (List of renamed places in India#West Bengal, its official name until 2001), is the capital and largest city of the Indian States and union territories of India, state of West Bengal. It lies on the eastern bank of the Hooghly River, west of the border with Bangladesh. It is the primary Financial centre, financial and Commercial area, commercial centre of Eastern India, eastern and Northeast India, northeastern India. Kolkata is the list of cities in India by population, seventh most populous city in India with an estimated city proper population of 4.5 million (0.45 crore) while its metropolitan region Kolkata Metropolitan Area is the List of million-plus agglomerations in India, third most populous metropolitan region of India with a metro population of over 15 million (1.5 crore). Kolkata is regarded by many sources as the cultural capital of India and a historically and culturally significant city in the historic Bengal, region of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New Delhi
New Delhi (; ) is the Capital city, capital of India and a part of the Delhi, National Capital Territory of Delhi (NCT). New Delhi is the seat of all three branches of the Government of India, hosting the Rashtrapati Bhavan, New Parliament House, New Delhi, Sansad Bhavan, and the Supreme Court of India, Supreme Court. New Delhi is a Municipal governance in India, municipality within the NCT, administered by the New Delhi Municipal Council (NDMC), which covers mostly Lutyens' Delhi and a few adjacent areas. The municipal area is part of a larger List of districts in India, administrative district, the New Delhi district. Although colloquially ''Delhi'' and ''New Delhi'' are used interchangeably to refer to the National Capital Territory of Delhi, both are distinct entities, with the municipality and the New Delhi district forming a relatively small part within the megacity of Delhi. The National Capital Region (India), National Capital Region is an even larger entity, compris ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mexico City
Mexico City is the capital city, capital and List of cities in Mexico, largest city of Mexico, as well as the List of North American cities by population, most populous city in North America. It is one of the most important cultural and financial centers in the world, and is classified as an Globalization and World Cities Research Network, Alpha world city according to the Globalization and World Cities Research Network (GaWC) 2024 ranking. Mexico City is located in the Valley of Mexico within the high Mexican central plateau, at an altitude of . The city has 16 Boroughs of Mexico City, boroughs or , which are in turn divided into List of neighborhoods in Mexico City, neighborhoods or . The 2020 population for the city proper was 9,209,944, with a land area of . According to the most recent definition agreed upon by the federal and state governments, the population of Greater Mexico City is 21,804,515, which makes it the list of largest cities#List, sixth-largest metropolitan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rio De Janeiro
Rio de Janeiro, or simply Rio, is the capital of the Rio de Janeiro (state), state of Rio de Janeiro. It is the List of cities in Brazil by population, second-most-populous city in Brazil (after São Paulo) and the Largest cities in the Americas, sixth-most-populous city in the Americas. Founded in 1565 by the Portuguese people, Portuguese, the city was initially the seat of the Captaincy of Rio de Janeiro, a domain of the Portuguese Empire. In 1763, it became the capital of the State of Brazil, a List of states of the Portuguese Empire, state of the Portuguese Empire. In 1808, when the Transfer of the Portuguese Court to Brazil, Portuguese Royal Court moved to Brazil, Rio de Janeiro became the seat of the court of Queen Maria I of Portugal. She subsequently, under the leadership of her son the prince regent John VI of Portugal, raised Brazil to the dignity of a kingdom, within the United Kingdom of Portugal, Brazil and the Algarves, United Kingdom of Portugal, Brazil, and Algar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
