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History Of Indian Science And Technology
The history of science and technology in the Indian subcontinent begins with the prehistoric human activity of the Indus Valley Civilization to the early Indian states and empires. Prehistory By 5500 BCE a number of sites similar to Mehrgarh (Pakistan) had appeared, forming the basis of later chalcolithic cultures. The inhabitants of these sites maintained trading relations with Near East and Central Asia.Kenoyer, 230 Irrigation was developed in the Indus Valley Civilization by around 4500 BCE. The size and prosperity of the Indus civilization grew as a result of this innovation, which eventually led to more planned settlements making use of drainage and sewerage.Rodda & Ubertini, 279 Sophisticated irrigation and water storage systems were developed by the Indus Valley Civilization, including artificial reservoirs at Girnar dated to 3000 BCE, and an early canal irrigation system from c. 2600 BCE. Cotton was cultivated in the region by the 5th–4th millennia BCE. Sugarcane wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prehistoric India
According to consensus in modern genetics, anatomically modern humans first arrived on the Indian subcontinent from Africa between 73,000 and 55,000 years ago. Quote: "Y-Chromosome and Mt-DNA data support the colonization of South Asia by modern humans originating in Africa. ... Coalescence dates for most non-European populations average to between 73–55 ka." However, the earliest known human remains in South Asia date to 30,000 years ago. Settled life, which involves the transition from foraging to farming and pastoralism, began in South Asia around 7000 BCE. At the site of Mehrgarh presence can be documented of the domestication of wheat and barley, rapidly followed by that of goats, sheep, and cattle. By 4500 BCE, settled life had spread more widely, and began to gradually evolve into the Indus Valley civilisation, an early civilisation of the Old World, which was contemporaneous with Ancient Egypt and Mesopotamia. This civilisation flourished between 2500 BCE and 1900 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Angular Measurement
In Euclidean geometry, an angle is the figure formed by two rays, called the '' sides'' of the angle, sharing a common endpoint, called the ''vertex'' of the angle. Angles formed by two rays lie in the plane that contains the rays. Angles are also formed by the intersection of two planes. These are called dihedral angles. Two intersecting curves may also define an angle, which is the angle of the rays lying tangent to the respective curves at their point of intersection. ''Angle'' is also used to designate the measure of an angle or of a rotation. This measure is the ratio of the length of a circular arc to its radius. In the case of a geometric angle, the arc is centered at the vertex and delimited by the sides. In the case of a rotation, the arc is centered at the center of the rotation and delimited by any other point and its image by the rotation. History and etymology The word ''angle'' comes from the Latin word ''angulus'', meaning "corner"; cognate words are the Greek ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hearth
A hearth () is the place in a home where a fire is or was traditionally kept for home heating and for cooking, usually constituted by at least a horizontal hearthstone and often enclosed to varying degrees by any combination of reredos (a low, partial wall behind a hearth), fireplace, oven, smoke hood, or chimney. Hearths are usually composed of masonry such as brick or stone. For centuries, the hearth was such an integral part of a home, usually its central and most important feature, that the concept has been generalized to refer to a homeplace or household, as in the terms "hearth and home" and "keep the home fires burning". In the modern era, since the advent of central heating, hearths are usually less central to most people's daily life because the heating of the home is instead done by a furnace or a heating stove, and cooking is instead done with a kitchen stove/range (combination cooktop and oven) alongside other home appliances; thus many homes built in the 20t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kalibangan
Kalibangān is a town located at on the left or southern banks of the Ghaggar (Ghaggar-Hakra River) in Tehsil Pilibangān, between Suratgarh and Hanumangarh in Hanumangarh District, Rajasthan, India 205 km. from Bikaner. It is also identified as being established in the triangle of land at the confluence of Drishadvati and Sarasvati Rivers. The prehistoric and pre-Mauryan character of Indus Valley civilization was first identified by Luigi Tessitori at this site. Kalibangan's excavation report was published in its entirety in 2003 by the Archaeological Survey of India, 34 years after the completion of excavations. The report concluded that Kalibangan was a major provincial capital of the Indus Valley Civilization. Kalibangan is distinguished by its unique fire altars and "world's earliest attested ploughed field". It is around 2900 BC that the region of Kalibangan developed into what can be considered a planned city. Indus Valley Civilization The Kalibangan pre-his ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oven
upA double oven A ceramic oven An oven is a tool which is used to expose materials to a hot environment. Ovens contain a hollow chamber and provide a means of heating the chamber in a controlled way. In use since antiquity, they have been used to accomplish a wide variety of tasks requiring controlled heating. Because they are used for a variety of purposes, there are many different types of ovens. These types differ depending on their intended purpose and based upon how they generate heat. Ovens are often used for cooking, where they can be used to heat food to a desired temperature. Ovens are also used in the manufacturing of ceramics and pottery; these ovens are sometimes referred to as kilns. Metallurgical furnaces are ovens used in the manufacturing of metals, while glass furnaces are ovens used to produce glass. There are many methods by which different types of ovens produce heat. Some ovens heat materials using the combustion of a fuel, such as wood, coal, or na ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ceramic
A ceramic is any of the various hard, brittle, heat-resistant and corrosion-resistant materials made by shaping and then firing an inorganic, nonmetallic material, such as clay, at a high temperature. Common examples are earthenware, porcelain, and brick. The earliest ceramics made by humans were pottery objects (''pots,'' ''vessels or vases'') or figurines made from clay, either by itself or mixed with other materials like silica, hardened and sintered in fire. Later, ceramics were glazed and fired to create smooth, colored surfaces, decreasing porosity through the use of glassy, amorphous ceramic coatings on top of the crystalline ceramic substrates. Ceramics now include domestic, industrial and building products, as well as a wide range of materials developed for use in advanced ceramic engineering, such as in semiconductors. The word "'' ceramic''" comes from the Greek word (), "of pottery" or "for pottery", from (), "potter's clay, tile, pottery". The earliest kno ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metallurgical Furnace
A metallurgical furnace, more commonly referred to as a furnace, is a device used to heat and melt metal ore to remove gangue, primarily in Metal, iron and steel production. The heat energy to fuel a furnace may be supplied directly by fuel combustion, by electricity such as the electric arc furnace, or through induction heating in induction furnaces. There are several different types of furnaces used in metallurgy to work with specific metal and ores. Smelting furnaces Smelting furnaces are used in smelting to extract metal from ore. Smelting furnaces include: * The blast furnace, used to Redox, reduce iron ore to pig iron ** Cold blast ** Hot blast * Steelmaking furnaces, including: ** Puddling furnace ** Reverberatory furnace ** ** Open hearth furnace ** Basic oxygen furnace ** Electric arc furnace ** Electric induction furnace Other furnaces * Furnaces used to remelt metal in Foundry, foundries. * Furnaces used to reheat and Heat treatment, heat treat metal for use in: ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kot Bala
Kot Bala (Urdu: کوٹ بالا; Hindi: कोट बाला), or Balakot (Hindi: बालाकोट) is an archaeological site located in Lasbela District, Balochistan, Pakistan. It is near the Makran coast of the Arabian Sea, and goes back to around 4000 BC. The settlement of Balakot precedes the Indus Valley civilization by many centuries. It is located in the interior of the Sonmiani Bay, along the Lasbela coast (the Plain of Las Bela). This site is of importance due to its proximity to the Arabian Sea, and is believed to have been a main harbour, from which the Indus traders sailed to the coasts of the Arabian Peninsula. Excavations The site was excavated by Professor George F. Dales of the University of California, Berkeley in the 1970s, but full details were not published. It is the only site in the region that was professionally excavated. The upper levels of the site belong to Indus Civilization, while the lower levels feature a culture of its own. The arrival ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Balakot
Balakot (; ur, ; ) is a town in Mansehra District in the Khyber Pakhtunkhwa province of Pakistan. The town was destroyed during the 2005 Kashmir earthquake, but was later rebuilt with the assistance of the Government of Pakistan and Saudi Public Assistance for Pakistan Earthquake Victims (SPAPEV), a Saudi relief organisation. Balakot also serves as a hub for tourists visiting Northern Areas Geography Balakot is located on the right bank of the Kunhar River. It is almost at two-thirds of the length of river from it its origin at Lake Dharam Sar deep in the Kaghan Valley, before it confluence with Jehlum River. The lower area below Balakot, sometimes referred to as Nainsukh Valley, is temperate while Kaghan Valley above Balakot City is cold enough to turn the whole area to freezing in the winter. Kaghan valley is a pleasant summer destination. Its upper part from Naran upstream lacks the monsoon but the lower part get it well and so is forested. Balakot is now expanding c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrography
Hydrography is the branch of applied sciences which deals with the measurement and description of the physical features of oceans, seas, coastal areas, lakes and rivers, as well as with the prediction of their change over time, for the primary purpose of safety of navigation and in support of all other marine activities, including economic development, security and defense, scientific research, and environmental protection. History The origins of hydrography lay in the making of charts to aid navigation, by individual mariners as they navigated into new waters. These were usually the private property, even closely held secrets, of individuals who used them for commercial or military advantage. As transoceanic trade and exploration increased, hydrographic surveys started to be carried out as an exercise in their own right, and the commissioning of surveys was increasingly done by governments and special hydrographic offices. National organizations, particularly navies, realized ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Indus Valley Civilization
The Indus Valley Civilisation (IVC), also known as the Indus Civilisation was a Bronze Age civilisation in the northwestern regions of South Asia, lasting from 3300 BCE to 1300 BCE, and in its mature form 2600 BCE to 1900 BCE. Together with ancient Egypt and Mesopotamia, it was one of three early civilisations of the Near East and South Asia, and of the three, the most widespread. Its sites spanned an area from much of Pakistan, to northeast Afghanistan, and northwestern India. The civilisation flourished both in the alluvial plain of the Indus River, which flows through the length of Pakistan, and along a system of perennial monsoon-fed rivers that once coursed in the vicinity of the Ghaggar-Hakra, a seasonal river in northwest India and eastern Pakistan. The term ''Harappan'' is sometimes applied to the Indus civilisation after its type site Harappa, the first to be excavated early in the 20th century in what was then the Punjab province o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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