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Gustav Hellmann
Gustav Johann Georg Hellmann or Georg Gustav Hellmann (3 July 1854 – 21 February 1939) was a German meteorologist. Hellmann was born in Löwen (Lewin Brzeski), Prussian Silesia. Since 1907 to 1922, he was the principal of the Preußischen Meteorologischen Institut (Prussian Meteorological Institute) in Berlin. He died in Berlin. Works * An editor of the "''Meteorologische Zeitschrift''" 1892-1907 (with Julius von Hann) * ''Repertorium der Deutschen Meteorologie'', 1883 * Work with snowflakes In 1892 Hellmann piqued an interest in pictures of snowflakes, after seeing some of Wilson Bentley's photography, he commissioned a microphotographer to take shots of snowflakes to study. Upon review of these microphotographs, Hellmann noted a large difference in the snowflake pictures he took, and the ones Wilson Bentley had taken. Hellmann's snowflakes were irregular, there were various types, sizes, shapes, and forms. Bentley's snowflakes however, were perfect, symmetrical, si ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meteorologist
A meteorologist is a scientist who studies and works in the field of meteorology aiming to understand or predict Earth's atmospheric phenomena including the weather. Those who study meteorological phenomena are meteorologists in research, while those using mathematical models and knowledge to prepare daily weather forecasts are called ''weather forecasters'' or ''operational meteorologists''. Meteorologists work in government agencies, private consulting and research services, industrial enterprises, utilities, radio and television stations, and in education. They are not to be confused with weather presenters, who present the weather forecast in the media and range in training from journalists having just minimal training in meteorology to full fledged meteorologists. Description Meteorologists study the Earth's atmosphere and its interactions with the Earth's surface, the oceans and the biosphere. Their knowledge of applied mathematics and physics allows them to understand the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wilson Bentley
Wilson Alwyn Bentley (February 9, 1865 – December 23, 1931), also known as Snowflake Bentley, was an American meteorologist and photographer, who was the first known person to take detailed photographs of snowflakes and record their features. He perfected a process of catching flakes on black velvet in such a way that their images could be captured before they either melted or sublimated. Kenneth G. Libbrecht notes that the techniques used by Bentley to photograph snowflakes are essentially the same as those used today, and that while the quality of his photographs reflects the technical limitations of the equipment of the era, "he did it so well that hardly anybody bothered to photograph snowflakes for almost 100 years". The broadest collection of Bentley's photographs is held by the Jericho Historical Society in his home town, Jericho, Vermont. Bentley donated his collection of original glass-plate photomicrographs of snow crystals to the Buffalo Museum of Science. A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Members Of The Prussian Academy Of Sciences
Member may refer to: * Military jury, referred to as "Members" in military jargon * Element (mathematics), an object that belongs to a mathematical set * In object-oriented programming, a member of a class ** Field (computer science), entries in a database ** Member variable, a variable that is associated with a specific object * Limb (anatomy), an appendage of the human or animal body ** Euphemism for penis * Structural component of a truss, connected by nodes * User (computing), a person making use of a computing service, especially on the Internet * Member (geology), a component of a geological formation * Member of parliament * The Members, a British punk rock band * Meronymy, a semantic relationship in linguistics * Church membership, belonging to a local Christian congregation, a Christian denomination and the universal Church * Member, a participant in a club or learned society A learned society (; also learned academy, scholarly society, or academic association) is an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
German Meteorologists
German(s) may refer to: * Germany (of or related to) **Germania (historical use) * Germans, citizens of Germany, people of German ancestry, or native speakers of the German language ** For citizens of Germany, see also German nationality law **Germanic peoples (Roman times) * German language **any of the Germanic languages * German cuisine, traditional foods of Germany People * German (given name) * German (surname) * Germán, a Spanish name Places * German (parish), Isle of Man * German, Albania, or Gërmej * German, Bulgaria * German, Iran * German, North Macedonia * German, New York, U.S. * Agios Germanos, Greece Other uses * German (mythology), a South Slavic mythological being * Germans (band), a Canadian rock band * "German" (song), a 2019 song by No Money Enterprise * ''The German'', a 2008 short film * "The Germans", an episode of ''Fawlty Towers'' * ''The German'', a nickname for Congolese rebel André Kisase Ngandu See also * Germanic (other) * Germa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1939 Deaths
This year also marks the start of the Second World War, the largest and deadliest conflict in human history. Events Below, the events of World War II have the "WWII" prefix. January * January 1 ** Third Reich *** Jews are forbidden to work with Germans. *** The Youth Protection Act was passed on April 30, 1938 and the Working Hours Regulations came into effect. *** The Jews name change decree has gone into effect. ** The rest of the world *** In Spain, it becomes a duty of all young women under 25 to complete compulsory work service for one year. *** First edition of the Vienna New Year's Concert. *** The company of technology and manufacturing scientific instruments Hewlett-Packard, was founded in a garage in Palo Alto, California, by William (Bill) Hewlett and David Packard. This garage is now considered the birthplace of Silicon Valley. *** Sydney, in Australia, records temperature of 45 ˚C, the highest record for the city. *** Philipp Etter took over as Swi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1854 Births
Events January–March * January 4 – The McDonald Islands are discovered by Captain William McDonald aboard the ''Samarang''. * January 6 – The fictional detective Sherlock Holmes is perhaps born. * January 9 – The Teutonia Männerchor in Pittsburgh, U.S.A. is founded to promote German culture. * January 20 – The North Carolina General Assembly in the United States charters the Atlantic and North Carolina Railroad, to run from Goldsboro through New Bern, to the newly created seaport of Morehead City, near Beaufort. * January 21 – The iron clipper runs aground off the east coast of Ireland, on her maiden voyage out of Liverpool, bound for Australia, with the loss of at least 300 out of 650 on board. * February 11 – Major streets are lit by coal gas for the first time by the San Francisco Gas Company; 86 such lamps are turned on this evening in San Francisco, California. * February 13 – Mexican troops force William Wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wind Gradient
In common usage, wind gradient, more specifically wind speed gradient or wind velocity gradient, or alternatively shear wind, is the vertical component of the gradient of the mean horizontal wind speed in the lower atmosphere. It is the rate of increase of wind strength with unit increase in height above ground level. In metric units, it is often measured in units of meters per second of speed, per kilometer of height (m/s/km), which reduces to the standard unit of shear rate, inverse seconds (s−1). Simple explanation Surface friction forces the surface wind to slow and turn near the surface of the Earth, blowing directly towards the low pressure, when compared to the winds in the nearly frictionless flow well above the Earth's surface. This layer, where surface friction slows the wind and changes the wind direction, is known as the planetary boundary layer. Daytime solar heating due to insolation thickens the boundary layer as winds warmed by contact with the ear ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Microphotograph
Microphotographs are photographs shrunk to microscopic scale.Focal encyclopedia of photography By Michael R. Peres Focal Press, 2007 , 846 pages Microphotography is the art of making such images. Applications of microphotography include such as in the , where they are known as |
Snowflake
A snowflake is a single ice crystal that has achieved a sufficient size, and may have amalgamated with others, which falls through the Earth's atmosphere as snow.Knight, C.; Knight, N. (1973). Snow crystals. Scientific American, vol. 228, no. 1, pp. 100–107.Hobbs, P.V. 1974. Ice Physics. Oxford: Clarendon Press. Each flake nucleates around a dust particle in supersaturated air masses by attracting Supercooling, supercooled cloud water droplets, which freezing, freeze and accrete in crystal form. Complex shapes Emergence, emerge as the flake moves through differing temperature and humidity zones in the atmosphere, such that individual snowflakes differ in detail from one another, but may be categorized in eight broad classifications and at least 80 individual variants. The main constituent shapes for ice crystals, from which combinations may occur, are needle, column, plate, and rime. Snow appears white in color despite being made of clear ice. This is due to diffuse reflection ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lewin Brzeski
Lewin Brzeski (german: Löwen) is a historic town situated in Brzeg County, Opole Voivodeship, southwestern Poland. The total population of Lewin Brzeski was estimated at 5,736 inhabitants in 2019. History Located along the medieval trade routes from Silesia to Hungary, by the Amber Road and the Eastern Neisse river, the town of Lewin first developed in the Middle Ages as a market town, located within the Piast-ruled Kingdom of Poland and as a result of the fragmentation of Poland it became part of the duchies of Opole, Brzeg and Legnica. It is first mentioned in a contract from 1257, when a monastery run by the Knights Hospitaller in Łosiów purchased a mill near the town. Its name is of Old Polish origin and refers to hunting. As early as the mid-13th century the city had received Magdeburg town rights, which granted the town a certain amount of autonomy. The town was built around a rectangular marketplace, and surrounded by a rampart with a palisade with a ditch below it that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peter Galison
Peter Louis Galison (born May 17, 1955, New York) is an American historian and philosopher of science. He is the Joseph Pellegrino University Professor in history of science and physics at Harvard University. Biography Galison received his Ph.D. at Harvard University in both physics and in the history of science in 1983. His publications include ''Image and Logic: A Material Culture of Microphysics'' (1997) and '' Einstein's Clocks, Poincaré's Maps: Empires of Time''. His most recent book (2007), co-authored with Lorraine Daston, is titled ''Objectivity''. Before moving to Harvard, Galison taught for several years at Stanford University, where he was professor of history, philosophy, and physics. He is considered a member of the Stanford School of philosophy of science, a group that also includes Ian Hacking, John Dupré, and Nancy Cartwright. Galison developed a film for the History Channel on the development of the hydrogen bomb, and has done work on the intersection ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Loraine Daston
Loraine may refer to: People *Loraine (name) Places * Loraine, California * Loraine, Illinois * Loraine, North Dakota * Loraine, Texas * Loraine Township, Henry County, Illinois Buildings *Hotel Loraine, Wisconsin, United States *Loraine Building, Michigan, United States Other uses * ''Loraine'', a song by Linton Kwesi Johnson from the album ''Bass Culture'' *Loraine baronets, English baronetage See also * Lorain (other) *Lorane (other) Lorane may refer to: *Lorane, Georgia *Lorane, Indiana Lorane is an unincorporated community in Etna-Troy Township, Whitley County, in the U.S. state of Indiana. History The community used to have three different names before the present-day n ... * Lorrain (other) * Lorraine (other) * Lorraine (given name) {{disambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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