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Carl Kellner (optician)
Carl Kellner (March 26, 1826 – May 13, 1855) was a German mechanic and Autodidacticism, self-educated mathematician who founded in 1849 an "Optical Institute" that later became the Leitz company, makers of the Leica Camera, Leica cameras. Biography Carl Kellner was born in Hirzenhain, Wetteraukreis, in Hesse. In 1849 he founded in Wetzlar a company called ''"Optisches Institut"'' for the production of lens (optics), lenses and microscopes. Kellner had invented a new achromatic lens, achromatic combination of lenses for an eyepiece, published in his treatise ''Das orthoskopische Ocular, eine neu erfundene achromatische Linsencombination'', that was able to produce an image with correct Perspective (visual), perspective and without the distortions that were usual for other optical instruments of the time. His invention is still useful and known as the eyepiece#Kellner or "Achromat", Kellner eyepiece. Legacy After his early death in Wetzlar in 1855 from tuberculosis at ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carl Kellner (1826 –1855)
Carl Kellner may refer to: *Carl Kellner (optician) (1826–1855), German inventor of the "Kellner eyepiece" *Carl Kellner (mystic) (1851–1905), Austrian chemist and mystic {{Hndis, name=Kellner, Carl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Friedrich Belthle
Friedrich may refer to: Names *Friedrich (surname), people with the surname ''Friedrich'' *Friedrich (given name), people with the given name ''Friedrich'' Other *Friedrich (board game), a board game about Frederick the Great and the Seven Years' War * ''Friedrich'' (novel), a novel about anti-semitism written by Hans Peter Richter *Friedrich Air Conditioning, a company manufacturing air conditioning and purifying products *, a German cargo ship in service 1941-45 See also *Friedrichs (other) *Frederick (other) *Nikolaus Friedreich Nikolaus Friedreich (1 July 1825 in Würzburg – 6 July 1882 in Heidelberg) was a German pathologist and neurologist, and a third generation physician in the Friedreich family. His father was psychiatrist Johann Baptist Friedreich (1796–1862) ... {{disambig ja:フリードリヒ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lens Designers
A lens is a transmissive optical device which focuses or disperses a light beam by means of refraction. A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (''elements''), usually arranged along a common axis. Lenses are made from materials such as glass or plastic, and are ground and polished or molded to a desired shape. A lens can focus light to form an image, unlike a prism, which refracts light without focusing. Devices that similarly focus or disperse waves and radiation other than visible light are also called lenses, such as microwave lenses, electron lenses, acoustic lenses, or explosive lenses. Lenses are used in various imaging devices like telescopes, binoculars and cameras. They are also used as visual aids in glasses to correct defects of vision such as myopia and hypermetropia. History The word ''lens'' comes from '' lēns'', the Latin name of the lentil (a seed of a lentil plant ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
People From Wetzlar
A person (plural, : people) is a being that has certain capacities or attributes such as reason, morality, consciousness or self-consciousness, and being a part of a culturally established form of social relations such as kinship, ownership of property, or legal obligation, legal responsibility. The defining features of personhood and, consequently, what makes a person count as a person, differ widely among cultures and contexts. In addition to the question of personhood, of what makes a being count as a person to begin with, there are further questions about personal identity and self: both about what makes any particular person that particular person instead of another, and about what makes a person at one time the same person as they were or will be at another time despite any intervening changes. The plural form "people" is often used to refer to an entire nation or ethnic group (as in "a people"), and this was the original meaning of the word; it subsequently acquired its us ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Businesspeople From Hesse
A businessperson, businessman, or businesswoman is an individual who has founded, owns, or holds shares in (including as an angel investor) a private-sector company. A businessperson undertakes activities (commercial or industrial) for the purpose of generating cash flow, sales, and revenue by using a combination of human, financial, intellectual, and physical capital with a view to fueling economic development and growth. History Prehistoric period: Traders Since a "businessman" can mean anyone in industry or commerce, businesspeople have existed as long as industry and commerce have existed. "Commerce" can simply mean "trade", and trade has existed through all of recorded history. The first businesspeople in human history were traders or merchants. Medieval period: Rise of the merchant class Merchants emerged as a "class" in medieval Italy (compare, for example, the Vaishya, the traditional merchant caste in Indian society). Between 1300 and 1500, modern accoun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1855 Deaths
Events January–March * January 1 – Ottawa, Ontario, is incorporated as a city. * January 5 – Ramón Castilla begins his third term as President of Peru. * January 23 ** The first bridge over the Mississippi River opens in modern-day Minneapolis, a predecessor of the Father Louis Hennepin Bridge. ** The 8.2–8.3 Wairarapa earthquake claims between five and nine lives near the Cook Strait area of New Zealand. * January 26 – The Point No Point Treaty is signed in the Washington Territory. * January 27 – The Panama Railway becomes the first railroad to connect the Atlantic and Pacific Oceans. * January 29 – Lord Aberdeen resigns as Prime Minister of the United Kingdom, over the management of the Crimean War. * February 5 – Lord Palmerston becomes Prime Minister of the United Kingdom. * February 11 – Kassa Hailu is crowned Tewodros II, Emperor of Ethiopia. * February 12 – Michigan State University (the "pioneer" land- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1826 Births
Eighteen or 18 may refer to: * 18 (number), the natural number following 17 and preceding 19 * one of the years 18 BC, AD 18, 1918, 2018 Film, television and entertainment * ''18'' (film), a 1993 Taiwanese experimental film based on the short story ''God's Dice'' * ''Eighteen'' (film), a 2005 Canadian dramatic feature film * 18 (British Board of Film Classification), a film rating in the United Kingdom, also used in Ireland by the Irish Film Classification Office * 18 (''Dragon Ball''), a character in the ''Dragon Ball'' franchise * "Eighteen", a 2006 episode of the animated television series ''12 oz. Mouse'' Music Albums * ''18'' (Moby album), 2002 * ''18'' (Nana Kitade album), 2005 * '' 18...'', 2009 debut album by G.E.M. Songs * "18" (5 Seconds of Summer song), from their 2014 eponymous debut album * "18" (One Direction song), from their 2014 studio album ''Four'' * "18", by Anarbor from their 2013 studio album '' Burnout'' * "I'm Eighteen", by Alice Cooper common ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wild Leitz AG
Wild, wild, wilds or wild may refer to: Common meanings * Wild animal * Wilderness, a wild natural environment * Wildness, the quality of being wild or untamed Art, media and entertainment Film and television * ''Wild'' (2014 film), a 2014 American film from the 2012 book * ''Wild'' (2016 film), a 2016 German film * '' The Wild'', a 2006 Disney 3D animation film * ''Wild'' (TV series), a 2006 American documentary television series * The Wilds (TV series), a 2020 fictional television series Literature * '' Wild: From Lost to Found on the Pacific Crest Trail'' a 2012 non-fiction book by Cheryl Strayed * ''Wild, An elemental Journey'', a 2006 autobiographical book by Jay Griffiths * ''The Wild'' (novel), a 1991 novel by Whitley Strieber * ''The Wild'', a science fiction novel by David Zindell * ''The Wilds'', a 1998 limited-edition horror novel by Richard Laymon Music * ''Wild'' (band), a five-piece classical female group Albums and EPs * ''Wild'' (EP), 2015 * ''Wild'', a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Binocular Vision
In biology, binocular vision is a type of vision in which an animal has two eyes capable of facing the same direction to perceive a single three-dimensional image of its surroundings. Binocular vision does not typically refer to vision where an animal has eyes on opposite sides of its head and shares no field of view between them, like in some animals. Neurological researcher Manfred Fahle has stated six specific advantages of having two eyes rather than just one: #It gives a creature a "spare eye" in case one is damaged. #It gives a wider field of view. For example, humans have a maximum horizontal field of view of approximately 190 degrees with two eyes, approximately 120 degrees of which makes up the binocular field of view (seen by both eyes) flanked by two uniocular fields (seen by only one eye) of approximately 40 degrees. #It can give stereopsis in which binocular disparity (or parallax) provided by the two eyes' different positions on the head gives precise depth per ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ernst Leitz
Ernst Leitz GmbH was a German corporation based in Wetzlar, a German centre for optics as well as an important location for the precision engineering industry, now divided into four independent companies: * Leica Camera, manufacturer of camera and sport optics equipment * Leica Geosystems, manufacturer of geodetic equipment * Leica Microsystems, manufacturer of microscopes and owner of the Leica brand * Leica Biosystems, a cancer diagnostics company History Carl Kellner, mechanic and self-taught mathematician, published his treatise ''Das orthoskopische Ocular, eine neu erfundene achromatische Linsencombination'' (''The orthoscopic ocular, a newly invented achromatic lens combination'') in 1849, describing a new optical formula he had developed. The ocular was capable of rendering an image with the correct perspective, free of the distortions typical of other microscopes at that time. Following his early death on 13 May 1855, his widow continued the business he had left behin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Precision Mechanic
Precision mechanics (also "fine mechanics") is an engineering discipline that deals with the design and construction of smaller precision machines, often including measuring and control mechanisms of different kinds. The study may be further defined as the practices of rigid body kinematics to the positioning and holding of objects on the micrometre scale and smaller. See also * List of engineering branches Engineering is the discipline and profession that applies science, scientific theories, mathematical methods, and empirical evidence to design, create, and analyze technological solutions cognizant of safety, human factors, physical laws, regulatio ... Engineering disciplines {{Mech-engineering-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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