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Carl Louis Schwendler
Carl Louis Schwendler (1838 – 1882) was a German electrician and one of the first proponents of the Tungsten based incandescent light bulb. He also published an influential textbook on telegraphs, and worked in British India at a senior post in the Telegraph Department. He was involved in setting up telegraphic communication between Agra and Calcutta solving problems in transmission of submerged cables. He was commissioned by the Railways to perform a feasibility study of lighting Indian Railways stations by electric lamp. Schwendler was a member of the Asiatic Society of Bengal. In 1867 a zoo was proposed by Joseph Fayrer and the idea was again raised by Schwendler in 1873. He helped in the setting up of this garden and offered his small menagerie (prior to his leaving India) to create the nucleus of the Alipore Zoological Gardens in Kolkata. The Zoological Gardens were formally inaugurated on January 1, 1876 by the Prince of Wales (King Edward VII) and opened to the public in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electrician
An electrician is a tradesperson specializing in electrical wiring of buildings, transmission lines, stationary machines, and related equipment. Electricians may be employed in the installation of new electrical components or the maintenance and repair of existing electrical infrastructure. Electricians may also specialize in wiring ships, airplanes, and other mobile platforms, as well as data and cable lines. Terminology ''Electricians'' were originally people who demonstrated or studied the principles of electricity, often electrostatic generators of one form or another. In the United States, electricians are divided into two primary categories: lineperson, who work on electric utility company distribution systems at higher voltages, and wiremen, who work with the lower voltages utilized inside buildings. Wiremen are generally trained in one of five primary specialties: commercial, residential, light industrial, industrial, and low-voltage wiring, more commonly known a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tungsten
Tungsten, or wolfram, is a chemical element with the symbol W and atomic number 74. Tungsten is a rare metal found naturally on Earth almost exclusively as compounds with other elements. It was identified as a new element in 1781 and first isolated as a metal in 1783. Its important ores include scheelite and wolframite, the latter lending the element its alternate name. The free element is remarkable for its robustness, especially the fact that it has the highest melting point of all known elements barring carbon (which sublimes at normal pressure), melting at . It also has the highest boiling point, at . Its density is , comparable with that of uranium and gold, and much higher (about 1.7 times) than that of lead. Polycrystalline tungsten is an intrinsically brittle and hard material (under standard conditions, when uncombined), making it difficult to work. However, pure single-crystalline tungsten is more ductile and can be cut with a hard-steel hacksaw. Tungsten occurs in many ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Incandescent Light Bulb
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light with a wire filament heated until it glows. The filament is enclosed in a glass bulb with a vacuum or inert gas to protect the filament from oxidation. Current is supplied to the filament by terminals or wires embedded in the glass. A bulb socket provides mechanical support and electrical connections. Incandescent bulbs are manufactured in a wide range of sizes, light output, and voltage ratings, from 1.5 volts to about 300 volts. They require no external regulating equipment, have low manufacturing costs, and work equally well on either alternating current or direct current. As a result, the incandescent bulb became widely used in household and commercial lighting, for portable lighting such as table lamps, car headlamps, and flashlights, and for decorative and advertising lighting. Incandescent bulbs are much less efficient than other types of electric lighting, converting les ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Telegraph
Telegraphy is the long-distance transmission of messages where the sender uses symbolic codes, known to the recipient, rather than a physical exchange of an object bearing the message. Thus flag semaphore is a method of telegraphy, whereas pigeon post is not. Ancient signalling systems, although sometimes quite extensive and sophisticated as in China, were generally not capable of transmitting arbitrary text messages. Possible messages were fixed and predetermined and such systems are thus not true telegraphs. The earliest true telegraph put into widespread use was the optical telegraph of Claude Chappe, invented in the late 18th century. The system was used extensively in France, and European nations occupied by France, during the Napoleonic era. The electric telegraph started to replace the optical telegraph in the mid-19th century. It was first taken up in Britain in the form of the Cooke and Wheatstone telegraph, initially used mostly as an aid to railway signalling. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
British India
The provinces of India, earlier presidencies of British India and still earlier, presidency towns, were the administrative divisions of British governance on the Indian subcontinent. Collectively, they have been called British India. In one form or another, they existed between 1612 and 1947, conventionally divided into three historical periods: *Between 1612 and 1757 the East India Company set up Factory (trading post), factories (trading posts) in several locations, mostly in coastal India, with the consent of the Mughal emperors, Maratha Empire or local rulers. Its rivals were the merchant trading companies of Portugal, Denmark, the Netherlands, and France. By the mid-18th century, three ''presidency towns'': Madras, Bombay and Calcutta, had grown in size. *During the period of Company rule in India (1757–1858), the company gradually acquired sovereignty over large parts of India, now called "presidencies". However, it also increasingly came under British government over ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Indian Railways
Indian Railways (IR) is a statutory body under the ownership of Ministry of Railways, Government of India that operates India's national railway system. It manages the fourth largest national railway system in the world by size, with a total route length of . or 83% of all the broad-gauge routes are electrified with 25 kV 50 Hz AC electric traction . In 2020, Indian Railways carried 808.6 crore (8.086 billion) passengers and in 2022, Railways transported 1418.1 million tonnes of freight. It runs 13,169 passenger trains daily, on both long-distance and suburban routes, covering 7,325 stations across India. Mail or Express trains, the most common types of trains, run at an average speed of . Suburban EMUs run at an average speed of . Ordinary passenger trains (incl. mixed) run at an average speed of . The maximum speed of passenger trains varies, with the Vande Bharat Express running at a peak speed of . In the freight segment, IR runs 8,479 trains daily. The a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Joseph Fayrer
Sir Joseph Fayrer, 1st Baronet FRS FRSE FRCS FRCP KCSI LLD (6 December 1824 – 21 May 1907) was a British physician who served as Surgeon General in India. He is noted for his writings on medicine, work on public health and his studies particularly on the treatment of snakebite, in India. He was also involved in official investigation on cholera, in which he did not accept the idea, proposed by Robert Koch, of germs as the cause of cholera. Early life The second son of Robert John Fayrer (1788–1869), a Commander in the Royal Navy, and wife Agnes Wilkinson (d. 1861) he was born at Plymouth, Devon. Fayrer's father was in charge of steamships after his retirement from the navy. The family lived for a time at Haverbrack, Westmorland where Joseph became acquainted with William Wordsworth, Hartley Coleridge and John Wilson. Joseph studied some engineering in 1840 and joined as a midshipman and in 1843 he travelled with his father to Bermuda. An outbreak of yellow fever made h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alipore Zoological Gardens
The Zoological Garden, Alipore (also informally called the Alipore Zoo or Kolkata Zoo) is India's oldest formally stated zoological park (as opposed to royal and British menageries) and a big tourist attraction in Kolkata, West Bengal. It has been open as a zoo since 1876, and covers . It is probably best known as the home of the Aldabra giant tortoise Adwaita, who was reputed to have been over 250 years old when he died in 2006. It is also home to one of the few captive breeding projects involving the Manipur brow-antlered deer. One of the most popular tourist attractions in Kolkata, it draws huge crowds during the winter season, especially during December and January. The highest attendance till date was on January 1, 2018 with 110,000 visitors. History The zoo had its roots in a private menagerie established by Governor General of India, Richard Wellesley, established around 1800 in his summer home at Barrackpore near Kolkata, as part of the ''Indian Natural History Proje ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kolkata
Kolkata (, or , ; also known as Calcutta , the official name until 2001) is the capital of the Indian state of West Bengal, on the eastern bank of the Hooghly River west of the border with Bangladesh. It is the primary business, commercial, and financial hub of Eastern India and the main port of communication for North-East India. According to the 2011 Indian census, Kolkata is the seventh-most populous city in India, with a population of 45 lakh (4.5 million) residents within the city limits, and a population of over 1.41 crore (14.1 million) residents in the Kolkata Metropolitan Area. It is the third-most populous metropolitan area in India. In 2021, the Kolkata metropolitan area crossed 1.5 crore (15 million) registered voters. The Port of Kolkata is India's oldest operating port and its sole major riverine port. Kolkata is regarded as the cultural capital of India. Kolkata is the second largest Bengali-speaking city after Dhaka ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ram Brahma Sanyal
Ram Brahma Sanyal (1858 – 13 October 1908) was the first Indian superintendent of the Alipore Zoological Gardens in Kolkata (then Calcutta). He was a pioneer in captive breeding, and was one of the first zookeepers trained as a biologist. He was a corresponding member of the Zoological Society of London and wrote a handbook on keeping and breeding animals in captivity – ''A Handbook of the Management of Animals in Captivity in Lower Bengal'' (1892) which was reviewed in the journal Nature (journal), Nature (4 August 1892). This was the standard handbook for zookeepers for over 50 years until Lee Crandall published ''The Management of Wild Mammals in Captivity'' in 1964. His scientific methods led to the rare birth of a live Sumatran rhinoceros in 1889, an event that was not seen in captivity until 2001. Biography R. B. Sanyal was born in Lalgola, Murshidabad District of present-day West Bengal in 1858 at his maternal uncle's house. His native place was a village named Mahula ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Robert Clive
Robert Clive, 1st Baron Clive, (29 September 1725 – 22 November 1774), also known as Clive of India, was the first British Governor of the Bengal Presidency. Clive has been widely credited for laying the foundation of the British East India Company rule in Bengal. He began as a writer (the term used then in India for an office clerk) for the East India Company (EIC) in 1744 and established Company rule in Bengal by winning the Battle of Plassey in 1757. In return for supporting the Nawab Mir Jafar as ruler of Bengal, Clive was granted a jagir of £30,000 () per year which was the rent the EIC would otherwise pay to the Nawab for their tax-farming concession. When Clive left India he had a fortune of £180,000 () which he remitted through the Dutch East India Company. Blocking impending French mastery of India, Clive improvised a 1751 military expedition that ultimately enabled the EIC to adopt the French strategy of indirect rule via puppet government. Hired ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
