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John Herschel The Younger
Colonel John Herschel (29 October 1837 – 31 May 1921) was an English military engineer, surveyor and astronomer. He was the son of Sir John Herschel, 1st Baronet, and grandson of William Herschel. Biography Herschel was born in Claremont, Cape Town, Claremont, a suburb of Cape Town in the British Cape Colony of South Africa, the third son and the sixth child (of twelve) of Sir John Herschel and his wife Margaret Brodie (née Stewart). His family had travelled to the Cape in late 1833, so that has father could work on an astronomical survey of the Southern Celestial Hemisphere, southern skies. The family returned to England in 1838, where Herschel was later educated at Clapham Grammar School, and then attended the East India Company Military Seminary at Addiscombe. Herschel entered the East India Company's service as a cadet to serve in the Bengal Engineers, and on 26 December 1856 was made a local and temporary Ensign (rank), ensign while under the command of Colonel Sandham ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Claremont, Cape Town
Claremont is a suburb of Cape Town, South Africa. It is situated 9 kilometres south of the city, and is one of the so-called " Southern Suburbs", it is situated alongside Lansdowne. It is an important commercial and residential area, which is currently experiencing significant growth and development. History Until the arrival of Dutch colonists in 1652, the uncultivated veld of the Cape Peninsula was used by the nomadic Khoisan as grazing for their cattle. The Dutch established an outpost on the shore of Table Bay, and in 1657 they established a number of farms south of the outpost. The most southerly of those original farms, named ''Louwvliet'' and ''Questenburg'', are today covered by the suburbs of Claremont and Newlands. The area was agricultural for about 150 years. Other estates that were established included ''Veldhuyzen'' in 1676, ''Stellenberg'' in 1697, ''Weltevreden'' (originally part of Stellenberg) in 1730, ''Sans Souci'' (originally part of Questenburg) in 1786, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ensign (rank)
Ensign (; Late Middle English, from Old French (), from Latin (plural)) is a junior rank of a commissioned officer in the armed forces of some countries, normally in the infantry or navy. As the junior officer in an infantry regiment was traditionally the carrier of the ensign flag, the rank acquired the name. This rank has generally been replaced in army ranks by second lieutenant. Ensigns were generally the lowest-ranking commissioned officer, except where the rank of subaltern existed. In contrast, the Arab rank of ensign, لواء, ''liwa''', derives from the command of units with an ensign, not the carrier of such a unit's ensign, and is today the equivalent of a major general. In Thomas Venn's 1672 ''Military and Maritime Discipline in Three Books'', the duties of ensigns are to include not only carrying the color but assisting the captain and lieutenant of a company and in their absence, have their authority. "Ensign" is ''enseigne'' in French, and ''chorąży'' in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carina Nebula
The Carina Nebula or Eta Carinae Nebula (catalogued as NGC 3372; also known as the Great Carina Nebula) is a large, complex area of bright and dark nebulosity in the constellation Carina, located in the Carina–Sagittarius Arm of the Milky Way galaxy. The nebula is approximately from Earth. The nebula has within its boundaries the large Carina OB1 association and several related open clusters, including numerous O-type stars and several Wolf–Rayet stars. encompasses the star clusters and . is one of the youngest known star clusters at half a million years old. is the home of , currently the most luminous star known in our Milky Way galaxy, together with the less luminous but more massive and famous Eta Carinae star system and the O2 supergiant . , , , , and are also considered members of the association. is the oldest and furthest from , indicating sequential and ongoing star formation. The nebula is one of the largest diffuse nebulae in our skies. Although it i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solar Eclipse Of August 18, 1868
A total solar eclipse occurred on August 18, 1868, also known as "The King of Siam's eclipse". A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby totally or partly obscuring the image of the Sun for a viewer on Earth. A total solar eclipse occurs when the Moon's apparent diameter is larger than the Sun's, blocking all direct sunlight, turning day into darkness. Totality occurs in a narrow path across Earth's surface, with the partial solar eclipse visible over a surrounding region thousands of kilometres wide. Observations Solar eclipse 1868Aug18-Bullock.png, Bullock sketch of the eclipse, ''Total Eclipses of the Sun'', 1900. Sketches of the total solar eclipse, 1868 (19745966082).jpg, M. Stephan sketches of the eclipse, ''Archives des missions scientifiques et littéraires'', 1868. Map of the solar eclipse of August 18, 1868 (19757912091).jpg, Map of the forecast path of the total eclipse, ''Archives des missions scientifiques et littéraires'', ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solar Corona
A corona ( coronas or coronae) is the outermost layer of a star's atmosphere. It consists of plasma. The Sun's corona lies above the chromosphere and extends millions of kilometres into outer space. It is most easily seen during a total solar eclipse, but it is also observable with a coronagraph. Spectroscopic measurements indicate strong ionization in the corona and a plasma temperature in excess of , much hotter than the surface of the Sun, known as the photosphere. The word ''corona'' is , in turn derived . History In 1724, French-Italian astronomer Giacomo F. Maraldi recognized that the aura visible during a solar eclipse belongs to the Sun, not to the Moon. In 1809, Spanish astronomer José Joaquín de Ferrer coined the term 'corona'. Based in his own observations of the 1806 solar eclipse at Kinderhook (New York), de Ferrer also proposed that the corona was part of the Sun and not of the Moon. English astronomer Norman Lockyer identified the first element unknown on E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spectroscopy
Spectroscopy is the field of study that measures and interprets the electromagnetic spectra that result from the interaction between electromagnetic radiation and matter as a function of the wavelength or frequency of the radiation. Matter waves and acoustic waves can also be considered forms of radiative energy, and recently gravitational waves have been associated with a spectral signature in the context of the Laser Interferometer Gravitational-Wave Observatory (LIGO) In simpler terms, spectroscopy is the precise study of color as generalized from visible light to all bands of the electromagnetic spectrum. Historically, spectroscopy originated as the study of the wavelength dependence of the absorption by gas phase matter of visible light dispersed by a prism. Spectroscopy, primarily in the electromagnetic spectrum, is a fundamental exploratory tool in the fields of astronomy, chemistry, materials science, and physics, allowing the composition, physical structure and e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Captain (British Army And Royal Marines)
Captain (Capt) is a junior officer rank of the British Army and Royal Marines and in both services it ranks above lieutenant and below major with a NATO ranking code of OF-2. The rank is equivalent to a lieutenant in the Royal Navy and to a flight lieutenant in the Royal Air Force. The rank of captain in the Royal Navy is considerably more senior (equivalent to the Army/RM rank of colonel) and the two ranks should not be confused. In the 21st-century British Army, captains are often appointed to be second-in-command (2IC) of a company or equivalent sized unit of up to 120 soldiers. History A rank of second captain existed in the Ordnance at the time of the Battle of Waterloo. From 1 April 1918 to 31 July 1919, the Royal Air Force maintained the junior officer rank of captain. RAF captains had a rank insignia based on the two bands of a naval lieutenant with the addition of an eagle and crown above the bands. It was superseded by the rank of flight lieutenant on the fol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Welbury
Welbury is a village and civil parish in the Hambleton district of North Yorkshire, England. It is about south of Appleton Wiske and north of Northallerton. The village is mentioned in the Domesday book (1086) as having 6 Geld units for taxable purposes and King William being the Lord. The village was originally in the Union of Northallerton which was in the Wapentake of Birdforth. In 1319, the village and fields were destroyed by marauding Scots on their way to meet the English at what would become the Battle of Myton. Since about 1800, the manor of Welbury has been held by the Earl of Harewood. St Leonard Church is 9th century and had renovations in 1815 and 1877. It is in the parish of Welbury in the Diocese of York. Welbury used to have its own railway station just south of the village built by the Leeds and Thirsk Railway (later the Leeds Northern Railway) which later became part of the North Eastern Railway. The station opened in 1852 and closed to passengers in 195 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Current Science
''Current Science'' is an English-language peer-reviewed multidisciplinary scientific journal. It was established in 1932 and is published by the Current Science Association along with the Indian Academy of Sciences. According to the ''Journal Citation Reports'', the journal has a 2018 impact factor of 0.756. ''Current Science'' is indexed by Web of Science, Current Contents, Geobase, Chemical Abstracts, IndMed and Scopus. The editor-in-chief An editor-in-chief (EIC), also known as lead editor or chief editor, is a publication's editorial leader who has final responsibility for its operations and policies. The highest-ranking editor of a publication may also be titled editor, managing ... is S. K. Satheesh of the Indian Institute of Science, Bengaluru. Retrieved 4 February 2018 |
Great Trigonometrical Survey
The Great Trigonometrical Survey was a project that aimed to survey the entire Indian subcontinent with scientific precision. It was begun in 1802 by the British infantry officer William Lambton, under the auspices of the East India Company.Gill, B. (2001); "THE BIG MAN. Surveying Sir George Everest", in: ''Professional Surveyor Magazine'', Vol. 21 Nr 2. Retrieveonline 8 March 2016. Under the leadership of his successor, George Everest, the project was made the responsibility of the Survey of India. Everest was succeeded by Andrew Scott Waugh, and after 1861, the project was led by James Walker, who oversaw its completion in 1871. Among the many accomplishments of the Survey were the demarcation of the British territories in India and the measurement of the height of the Himalayan giants: Everest, K2, and Kanchenjunga. The Survey had an enormous scientific impact as well, being responsible for one of the first accurate measurements of a section of an arc of longitude, and for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Company Rule In India
Company rule in India (sometimes, Company ''Raj'', from hi, rāj, lit=rule) refers to the rule of the British East India Company on the Indian subcontinent. This is variously taken to have commenced in 1757, after the Battle of Plassey, when the Nawab of Bengal was defeated and replaced with another individual who had the support of the East India Company; or in 1765, when the Company was granted the ''diwani'', or the right to collect revenue, in Bengal and Bihar; or in 1773, when the Company abolished local rule (Nizamat) and established a capital in Calcutta, appointed its first Governor-General, Warren Hastings, and became directly involved in governance. The rule lasted until 1858, when, after the Indian Rebellion of 1857 and consequently of the Government of India Act 1858, the British government assumed the task of directly administering India in the new British Raj. Expansion and territory The English East India Company ("the Company") was founded in 1600, as ''The Co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mining (military)
Tunnel warfare involves war being conducted in tunnel and other underground cavities. It often includes the construction of underground facilities (mining or undermining) in order to attack or defend, and the use of existing natural caves and artificial underground facilities for military purposes. Tunnels can be used to undermine fortifications and slip into enemy territory for a surprise attack, while it can strengthen a defense by creating the possibility of ambush, counterattack and the ability to transfer troops from one portion of the battleground to another unseen and protected. Also, tunnels can serve as shelter from enemy attack. Since antiquity, sappers have used mining against walled cites, fortresses, castles or other strongly held and fortified military positions. Defenders have dug counter-mines to attack miners or destroy a mine threatening their fortifications. Since tunnels are commonplace in urban areas, tunnel warfare is often a feature, though usually a min ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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