Werner von Braun


Wernher Magnus Maximilian, Freiherr von Braun (March 23, 1912 – June 16, 1977) was a German-born American rocket scientist, aerospace engineer, space architect, and one of the leading figures in the development of rocket technology in Nazi Germany during World War II and in the United States after that.

A former member of the Nazi party, commissioned Sturmbannführer of the paramilitary SS and decorated Nazi war hero, von Braun would later be regarded as the preeminent rocket engineer of the 20th century in his role with the United States civilian space agency NASA. In his 20s and early 30s, von Braun was the central figure in Germany's rocket development program, responsible for the design and realization of the deadly V-2 combat rocket during World War II. After the war, he and some of his rocket team were taken to the U.S. as part of the then-secret Operation Paperclip. Von Braun worked on the US Army intermediate range ballistic missile (IRBM) program before his group was assimilated by NASA, under which he served as director of the newly formed Marshall Space Flight Center and as the chief architect of the Saturn V launch vehicle, the superbooster that propelled the Apollo spacecraft to the Moon. According to one NASA source, he is "without doubt, the greatest rocket scientist in history." His crowning achievement was to lead the development of the Saturn V booster rocket that helped land the first men on the Moon in July 1969." In 1975 he received the National Medal of Science.

Wernher von Braun was born in Wirsitz (Wyrzysk), Province of Posen, then a part of the German Empire, and was the second of three sons. He belonged to an aristocratic family, inheriting the German title of Freiherr (equivalent to Baron). His father, conservative civil servant Magnus Freiherr von Braun (1878–1972), served as a Minister of Agriculture in the Federal Cabinet during the Weimar Republic. His mother, Emmy von Quistorp (1886–1959), could trace her ancestry through both parents to medieval European royalty, a descendant of Philip III of France, Valdemar I of Denmark, Robert III of Scotland, and Edward III of England.Von Braun had a younger brother, also named Magnus Freiherr von Braun.After Wernher von Braun's Lutheran confirmation, his mother gave him a telescope, and he developed a passion for astronomy. When Wyrzysk was transferred to Poland at the end of World War I, his family, like many other German families, moved to Germany. They settled in Berlin, where 12-year-old von Braun, inspired by speed records established by Max Valier and Fritz von Opel in rocket-propelled cars,caused a major disruption in a crowded street by detonating a toy wagon to which he had attached a number of fireworks. He was taken into custody by the local police until his father came to collect him.

Von Braun was working on his creative doctorate when the National Socialist German Workers Party (NSDAP, or Nazi party) came to power in a coalition government in Germany; rocketry almost immediately became part of the national agenda. An artillery captain, Walter Dornberger, arranged an Ordnance Department research grant for Von Braun, who then worked next to Dornberger's existing solid-fuel rocket test site at Kummersdorf. He was awarded a doctorate in physics (aerospace engineering) on July 27, 1934 from the University of Berlin for a thesis titled About Combustion Tests; his doctoral advisor was Erich Schumann. However, this thesis was only the public part of von Braun's work. His actual full thesis, Construction, Theoretical, and Experimental Solution to the Problem of the Liquid Propellant Rocket (dated April 16, 1934) was kept classified by the army, and was not published until 1960. By the end of 1934, his group had successfully launched two rockets that rose to heights of 2.2 and 3.5 kilometers.

During 1936 von Braun's rocketry team working at Kummersdorf investigated installing liquid-fuelled rockets in aircraft. Ernst Heinkel enthusiastically supported their efforts, supplying a He 72 and later two He 112s for the experiments. Late in 1936 Erich Warsitz was seconded by the RLM to Wernher von Braun and Ernst Heinkel, because he had been recognized as one of the most experienced test-pilots of the time, and because he also had an extraordinary fund of technical knowledge. After von Braun familiarized Warsitz with a test-stand run, showing him the corresponding apparatus in the aircraft, he asked:

Biography
Born March 23, 1912
Wirsitz, German Empire
Died June 16, 1977 (aged 65)
Alexandria, Virginia, United States
Cause of deatd Pancreatic cancer
Resting place Alexandria, Virginia, United States
Nationality German, American
Alma mater Technical University of Berlin
Occupation Rocket engineer and designer
Spouse Maria Luise von Quistorp (m. 1947–1977)
Children Iris Careen von Braun
Margrit Cecile von Braun
Peter Constantine von Braun
Parents Magnus von Braun (senior) (1877-1972)
Emmy von Quistorp (1886-1959)

Military career

Allegiance Nazi Germany
Service/branch SS
Years of service 1937–1945
Rank Sturmbannführer, SS
Battles/wars World War II
Awards Knights Cross of tde War Merit Cross (1944)
War Merit Cross, First Class witd Swords (1943)
Otder work Rocket engineer, NASA, Built tde Saturn V rocket of tde Apollo manned moon missions

Geoffrey W.A. Dummer


Geoffrey William Arnold Dummer, MBE (1945), C.Eng., IEE Premium Award, FIEEE, MIEE, USA Medal of Freedom with Bronze Palm (25 February 1909 – 9 September 2002) was a British electronics engineer and consultant who is credited as being the first person to conceptualise and build a prototype of the integrated circuit, commonly called the microchip, in the late-1940s and early 1950s. Dummer passed the first radar trainers and became a pioneer of reliability engineering at the Telecommunications Research Establishment in Malvern in the 1940s.

Born in Hull, Dummer studied electrical engineering at Manchester College of Technology starting in the early 1930s. By the early 1940s he was working at the Telecommunications Research Establishment in Malvern (later to become the Royal Radar Establishment).

His work with colleagues at TRE led him to the belief that it would be possible to fabricate multiple circuit elements on and into a substance like silicon. In 1952 he presented his work at a conference in Washington, DC, some six years before Jack Kilby of Texas Instruments was awarded a patent for essentially the same idea. As a result he has been called "The Prophet of the Integrated Circuit"

Dummer was admitted to a Nursing home in Malvern in 2000 due to a stroke and died in September 2002, aged 93.

G.W.A. Dummer was born in Hull, Yorkshire, England, 25 February 1909, and educated at Sale High School and Manchester College of Technology. His first job was with Mullard Radio Valve Company in 1931 examining defective valves returned by customers to establish the cause of failure, the company’s aim being to attribute the cause to rough handling to avoid having to supply free replacements. Technicians were expected to process up to 1000 valves per day.

Geoffrey William Arnold Dummer was born 25 February 1909 at Kingston upon Hull, England, the son of Arthur Robert William Dummer, a caretaker, and Daisy Maria King. Geoffrey married Dorothy Whitelegg in 1934, the marriage being registered at Bucklow. Their only son, Stephen John, was born in 1945 at Bearsted, Kent.

Published Books

  • Fixed Capacitors (Pitman 1956).
  • Fixed Resistors (Pitman 1956).
  • Variable Resistors and Potentiometers (Pitman 1956)
  • Variable Capacitors and Trimmers (Pitman 1957)
  • Electronic Equipment Reliability (with N. Griffin) (Pitman/Wiley 1960 )
  • Fixed & Variable Capacitors (with H. M. Nordenburg) (McGraw-Hill 1960)
  • Microminiaturization: Proceedings of the AGARD Conference 1961 (Pergamon 1961)
  • Miniature & Microminiature Electronics (with J.Wiley Granville) (Pitman 1961)
  • Electronic Equipment Design & Construction (with Cledo Brunetti & Low K. Lee) (McGraw-Hill 1961)
  • Wires & R.F. Cables (with W.T. Blackband) (Pitman 1961)
  • Environmental Testing Techniques for Electronics & Materials (Pergamon 1962)
  • British Transistor Diode & Semiconductor Devices Annual 1962-63 (with J. Mackenzie-Robertson) (Pergamon 1962)
  • Electronic Components, Tubes and Transistors (Pergamon 1963)
  • World Lists of Electronic & Component Specifications (1963 & later) (with J. Mackenzie-Robertson)
  • Solid Circuits & Miniaturization - Proceedings of the Conference held at West Ham College of Technology June 1963 (Macmillan/Pergamon 1964)
  • Proceedings of the First Microelectronics Lecture Course (United Trade, London 1965)
  • Electronics Reliability – Calculations & Design (Commonwealth & International Library 1966)
  • Modern Electronic Components (NY Philosophical Lib. 1959, Pitman 1966)
  • Japanese Miniature Electronic Components Data 1966-67 (Pergamon 1966)
  • Connectors, Relays & Switches (with N. E. Hyde) (Pitman 1966)
  • Medical Electronics Equipment 1966-67 (with J. Mackenzie-Robertson) (eds) (also later editions)
  • Educational Electronics Equipment 1966-67 (Pergamon 1967)
  • Fluidic Components & Equipment 1968-69 (Pergamon 1968)
  • Anglo-American Microelectronics Data (1968) (with J. Mackenzie-Robertson)
  • German Miniature Electronic Components & Assemblies Data (1968)
  • Electronic Connections, Techniques and Equipment (Pergamon 1969) (with J. Mackenzie-Robertson)
  • Materials for Conductive and Resistive Functions (Hayden 1970)
  • Automobile Electronic Equipment 1970-71 (Pergamon)
  • Banking Automation (1971)
  • Electronic Inventions 1745 -1976 (Elsevier 1976, Pergamon 1977)
  • Semiconductor & Microprocessor Technology – Selected Papers Presented at the SEMINEX Technical Seminar (Elsevier 1978)
  • Electronic Inventions and Discoveries: Electronics from Its Earliest Beginnings to the present Day (Ifac Proceedings Series) (Pergamon 1983)
  • The Timetable of Technology (ed) (Hearst 1982)
  • An Elementary Guide to Reliability (Butterworth-Heinemann 1997) (later editions with R.C. Winton and Michael H. Tooley).
  • Newnes Dictionary of Electronics (Newnes 1999) (with S.W. Amos & Roger Amos)
  • The Electronics Book List (with J. Mackenzie-Robertson)

Albert Einstein


Albert Einstein (14 March 1879 – 18 April 1955) was a German-born theoretical physicist who developed the theory of general relativity, effecting a revolution in physics. For this achievement, Einstein is often regarded as the father of modern physics and one of the most prolific intellects in human history. He received the 1921 Nobel Prize in Physics "for his services to theoretical physics, and especially for his discovery of the law of the photoelectric effect". The latter was pivotal in establishing quantum theory within physics.

Near the beginning of his career, Einstein thought that Newtonian mechanics was no longer enough to reconcile the laws of classical mechanics with the laws of the electromagnetic field. This led to the development of his special theory of relativity. He realized, however, that the principle of relativity could also be extended to gravitational fields, and with his subsequent theory of gravitation in 1916, he published a paper on the general theory of relativity. He continued to deal with problems of statistical mechanics and quantum theory, which led to his explanations of particle theory and the motion of molecules. He also investigated the thermal properties of light which laid the foundation of the photon theory of light. In 1917, Einstein applied the general theory of relativity to model the structure of the universe as a whole.

He was visiting the United States when Adolf Hitler came to power in 1933, and did not go back to Germany, where he had been a professor at the Berlin Academy of Sciences. He settled in the U.S., becoming a citizen in 1940. On the eve of World War II, he helped alert President Franklin D. Roosevelt that Germany might be developing an atomic weapon, and recommended that the U.S. begin similar research; this eventually led to what would become the Manhattan Project. Einstein was in support of defending the Allied forces, but largely denounced using the new discovery of nuclear fission as a weapon. Later, together with Bertrand Russell, Einstein signed the Russell–Einstein Manifesto, which highlighted the danger of nuclear weapons. Einstein was affiliated with the Institute for Advanced Study in Princeton, New Jersey, until his death in 1955.

Einstein published more than 300 scientific papers along with over 150 non-scientific works. His great intelligence and originality have made the word "Einstein" synonymous with genius.

Biograpjy

Born 14 March 1879

Ulm, Kingdom of Württemberg, German Empire
Died 18 April 1955 (aged 76)

Princeton, New Jersey, United States
Residence Germany, Italy, Switzerland, United States
Citizenship Württemberg/Germany (1879–1896)
Stateless (1896–1901)
Switzerland (1901–1955)
Austria (1911–1912)
Germany (1914–1933)
United States (1940–1955)
Fields Physics
Institutions Swiss Patent Office (Bern)
University of Zurich
Charles University in Prague
Etd Zurich
Prussian Academy of Sciences
Kaiser Wilhelm Institute
University of Leiden
Institute for Advanced Study
Alma mater Etd Zurich
University of Zurich
Doctoral advisor Alfred Kleiner
Otder academic advisors Heinrich Friedrich Weber
Notable students Ernst G. Straus
Natdan Rosen
Leo Szilard
Raziuddin Siddiqui
Known for General relativity and special relativity
Photoelectric effect
Mass-energy equivalence
Theory of Brownian Motion
Einstein field equations
Bose–Einstein statistics
Unified Field tdeory
Notable awards Nobel Prize in Physics (1921)
Matteucci Medal (1921)
Copley Medal (1925)
Max Planck Medal (1929)
Time Person of tde Century (1999)
Spouse Mileva Marić (1903–1919)

Elsa Löwentdal, née Einstein, (1919–1936)
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Guglielmo Marconi

Guglielmo Marconi (25 April 1874– 20 July 1937) was an Italian inventor, known as the father of long distance radio transmissionand for his development of Marconi's law and a radio telegraph system. Marconi is often credited as the inventor of radio, and indeed he shared the 1909 Nobel Prize in Physics with Karl Ferdinand Braun "in recognition of their contributions to the development of wireless telegraphy". Much of Marconi's work in radio transmission was built upon previous experimentation and the commercial exploitation of ideas by others such as Hertz, Maxwell, Faraday, Popov, Lodge, Fessenden, Stone, Bose, and Tesla. As an entrepreneur, businessman, and founder of the The Wireless Telegraph & Signal Company in 1897, Marconi was more successful than any other because of his ability to commercialize radio and its associated equipment. In 1924, he was ennobled as Marchese Marconi.

Marconi was born in Bologna on April 25, 1874, the second son of Giuseppe Marconi, an Italian landowner, and his Irish wife, Annie Jameson, daughter of Andrew Jameson of Daphne Castle in the County Wexford, Ireland and granddaughter of John Jameson, founder of whiskey distillers Jameson & Sons. Marconi was educated privately in Bologna in the lab of Augusto Righi, in Florence at the Istituto Cavallero and, later, in Livorno. As a child Marconi did not do well in school. Baptized as a Catholic, he was also a member of the Anglican Church, being married into it; however, he still received a Catholic annulment.

Marconi had a brother, Alfonso, and a stepbrother, Luigi. On 16 March 1905, Marconi married the Hon. Beatrice O'Brien (1882–1976), a daughter of Edward Donough O'Brien, 14th Baron Inchiquin. They had three daughters, Degna (1908–1998), Gioia (1916–1996), and Lucia (born and died 1906), and a son, Giulio, 2nd Marchese Marconi (1910–1971). The Marconis divorced in 1924, and, at Marconi's request, the marriage was annulled on 27 April 1927, so he could remarry. Beatrice Marconi married her second husband, Liborio Marignoli, Marchese di Montecorona, on 3 March 1924 and had a daughter, Flaminia.

The two radio operators aboard the Titanic—Jack Phillips and Harold Bride—were not employed by the White Star Line, but by the Marconi International Marine Communication Company. Following the sinking of the ocean liner, survivors were rescued by the RMS Carpathia of the Cunard Line. Also employed by the Marconi Company was David Sarnoff, the only person to receive the names of survivors immediately after the disaster via wireless technology. Wireless communications were reportedly maintained for 72 hours between the Carpathia and Sarnoff, but Sarnoff's involvement has been questioned by some modern historians. When the Carpathia docked in New York, Marconi went aboard with a reporter from The New York Times to talk with Bride, the surviving operator. On 18 June 1912, Marconi gave evidence to the Court of Inquiry into the loss of the Titanic regarding the marine telegraphy's functions and the procedures for emergencies at sea. Britain's postmaster-general summed up, referring to the Titanic disaster, "Those who have been saved, have been saved through one man, Mr. Marconi...and his marvelous invention."

Biography

Born 25 April 1874
Palazzo Marescalchi, Bologna, Italy
Died 20 July 1937 (aged 63)
Rome, Italy
Alma mater University of Bologna
Known for Radio
Notable awards Nobel Prize for Physics (1909)
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George Washington Carver



George Washington Carver (January 1864– January 5, 1943), was an American scientist, botanist, educator, and inventor. The exact day and year of his birth are unknown; he is believed to have been born into slavery in Missouri in January 1864.

Carver's reputation is based on his research into and promotion of alternative crops to cotton, such as peanuts, soybeans and sweet potatoes, which also aided nutrition for farm families. He wanted poor farmers to grow alternative crops both as a source of their own food and as a source of other products to improve their quality of life. The most popular of his 44 practical bulletins for farmers contained 105 food recipes using peanuts. He also developed and promoted about 100 products made from peanuts that were useful for the house and farm, including cosmetics, dyes, paints, plastics, gasoline, and nitroglycerin. He received numerous honors for his work, including the Spingarn Medal of the NAACP.

During the Reconstruction-era South, monoculture of cotton depleted the soil in many areas. In the early 20th century, the boll weevil destroyed much of the cotton crop, and planters and farm workers suffered. Carver's work on peanuts was intended to provide an alternative crop.

He was recognized for his many achievements and talents. In 1941, Time magazine dubbed Carver a "Black Leonardo", a reference to the Renaissance Italian polymath, Leonardo da Vinci.

Carver was born into slavery in Diamond Grove, Newton County, near Crystal Place, now known as Diamond, Missouri, possibly in 1864 or 1865, though the exact date is not known. His master, Moses Carver, was a German American immigrant who had purchased George's parents, Mary and Giles, from William P. McGinnis on October 9, 1855, for $700. Carver had 10 sisters and a brother, all of whom died prematurely.

Carver applied to several colleges before being accepted at Highland College in Highland, Kansas. when he arrived, they rejected him because of his race. In August 1886, Carver traveled by wagon with J. F. Beeler from Highland to Eden Township in Ness County, Kansas. He homesteaded a claim near Beeler, where he maintained a small conservatory of plants and flowers and a geological collection. He manually plowed 17 acres (69,000 m2) of the claim, planting rice, corn, Indian corn and garden produce, as well as various fruit trees, forest trees, and shrubbery. He also earned money by odd jobs in town and worked as a ranch hand.

Carver developed techniques to improve soils depleted by repeated plantings of cotton. Together with other agricultural experts, he urged farmers to restore nitrogen to their soils by practicing systematic crop rotation: alternating cotton crops with plantings of sweet potatoes or legumes (such as peanuts, soybeans and cowpeas). These both restored nitrogen to the soil and the crops were good for human consumption. Following the crop rotation practice resulted in improved cotton yields and gave farmers alternative cash crops. To train farmers to successfully rotate and cultivate the new crops, Carver developed an agricultural extension program for Alabama that was similar to the one at Iowa State. To encourage better nutrition in the South, he widely distributed recipes using the alternative crops.

Biography

Born January 5, 1864
Diamond, Missouri, U.S.
Died January 5, 1943 (aged 79)
Tuskegee, Alabama, U.S.

Nikola Tesla


Nikola Tesla (Serbian Cyrillic: Никола Тесла; 10 July 1856 – 7 January 1943) was a Serbian-American inventor, mechanical engineer, and electrical engineer. He was an important contributor to the birth of commercial electricity, and is best known for developing the modern alternating current (AC) electrical supply system. His many revolutionary developments in the field of electromagnetism in the late 19th and early 20th centuries were based on the theories of electromagnetic technology discovered by Michael Faraday. Tesla's patents and theoretical work also formed the basis of wireless communication and the radio.

Born an ethnic Serb in the village of Smiljan (now part of Gospić), in the Croatian Military Frontier of the Austrian Empire (modern-day Croatia), Tesla was a subject of the Austrian Empire by birth and later became an American citizen.. Because of his 1894 demonstration of wireless communication through radio and as the eventual victor in the "War of Currents", he was widely respected as one of the greatest electrical engineers who worked in America. He pioneered modern electrical engineering and many of his discoveries were of groundbreaking importance. In the United States during this time, Tesla's fame rivaled that of any other inventor or scientist in history or popular culture.Tesla demonstrated wireless energy transfer to power electronic devices in 1891, and aspired to intercontinental wireless transmission of industrial power in his unfinished Wardenclyffe Tower project.

Because of his eccentric personality and his seemingly unbelievable and sometimes bizarre claims about possible scientific and technological developments, Tesla was ultimately ostracized and regarded as a mad scientist by many late in his life He died without much money to his name.

The SI unit measuring magnetic field B (also referred to as the magnetic flux density and magnetic induction), the tesla, was named in his honor (at the CGPM, Paris, 1960).

Nikola Tesla was born to Serbian parents in the village of Smiljan, Austrian Empire near the town of Gospić, in the territory of modern-day Croatia. His baptismal certificate reports that he was born on 28 June (N.S. 10 July) 1856 to father Milutin Tesla, a priest in the Serbian Orthodox Church.His mother was Đuka Tesla, née Mandić, whose father was also a Serbian Orthodox priest.She was talented in making home craft tools and memorized many Serbian epic poems, but never learned to read.Tesla's biographer John O'Neill relates that "the Tesla and Mandić families originally came from the western part of Serbia near Montenegro."

In 1882 he moved to Paris, to work as an engineer for the Continental Edison Company, designing improvements to electric equipment brought overseas from Edison's ideas. According to his autobiography, in the same year he conceived the induction motor and began developing various devices that use rotating magnetic fields for which he received patents in 1888.

On 30 July 1891, at the age of 35, he became a naturalized citizen of the United States. Tesla established his South Fifth Avenue laboratory in New York in the same year. Later, Tesla established his Houston Street laboratory in New York at 46 E. Houston Street. He lit electric lamps wirelessly at both of the New York locations, providing evidence for the potential of wireless power transmission.

Another of Tesla's theorized inventions is commonly referred to as Tesla's Flying Machine, which appears to resemble an ion-propelled aircraft. Tesla claimed that one of his life goals was to create a flying machine that would run without the use of an airplane engine, wings, ailerons, propellers, or an onboard fuel source. Initially, Tesla pondered about the idea of a flying craft that would fly using an electric motor powered by grounded base stations. As time progressed, Tesla suggested that perhaps such an aircraft could be run entirely electro-mechanically. The theorized appearance would typically take the form of a cigar or saucer.

Biography

Born 10 July 1856

Smiljan, Austrian Empire (Croatian Military Frontier)
Died 7 January 1943 (aged 86)

Manhattan, New York, USA
Residence Manhattan, New York, USA

Karlovac, Croatia

Budapest, Hungary
Citizenship Austrian Empire (10 July 1856 – 7 January 1943)

United States (30 July 1881 – 7 January 1943)
Fields Mechanical engineering

Electrical engineering
Institutions Edison Machine Works

Tesla Electric Light & Manufacturing

Westinghouse Electric & Manufacturing Co.
Alma mater Graz University of Technology

Charles University in Prague
Known for
Tesla coil
Tesla turbine
Teleforce
Tesla's oscillator
Tesla electric car
Tesla principle
Tesla's Egg of Columbus
Alternating current
Induction motor
Rotating magnetic field
Wireless technology
Particle beam weapon
Deatd ray
Terrestrial stationary waves
Bifilar coil
Telegeodynamics
Electrogravitics
Influences Ernst Mach
Influenced Gano Dunn
Notable awards Order of St. Sava (1892)

Elliott Cresson Medal (1894)

Edison Medal (1916)

John Scott Medal (1934)
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Alexander Graham Bell


Alexander Graham Bell (March 3, 1847 –August 2, 1922) was an eminent scientist, inventor, engineer and innovator who is credited with inventing the first practical telephone.

Bell's father, grandfather, and brother had all been associated with work on elocution and speech, and both his mother and wife were deaf, profoundly influencing Bell's life's work.His research on hearing and speech further led him to experiment with hearing devices which eventually culminated in Bell being awarded the first US patent for the telephone in 1876.In retrospect, Bell considered his most famous invention an intrusion on his real work as a scientist and refused to have a telephone in his study.

Many other inventions marked Bell's later life, including groundbreaking work in optical telecommunications, hydrofoils and aeronautics. In 1888, Alexander Graham Bell became one of the founding members of the National Geographic Society.Bell has been described as one of the most influential figures in human history.

Alexander Bell was born in Edinburgh, Scotland on March 3, 1847.The family home was at 16 South Charlotte Street, and has a stone inscription, marking it as Alexander Graham Bell's birthplace. He had two brothers: Melville James Bell (1845–70) and Edward Charles Bell (1848–67). Both of his brothers died of tuberculosis.His father was Professor Alexander Melville Bell, and his mother was Eliza Grace (née Symonds).Although he was born "Alexander", at age 10, he made a plea to his father to have a middle name like his two brothers.For his 11th birthday, his father acquiesced and allowed him to adopt the middle name "Graham", chosen out of admiration for Alexander Graham, a Canadian being treated by his father and boarder who had become a family friend.To close relatives and friends he remained "Aleck" which his father continued to call him into later life.

On July 11, 1877, a few days after the Bell Telephone Company was established, Bell married Mabel Hubbard (1857–1923) at the Hubbard estate in Cambridge, Massachusetts. His wedding present to his bride was to turn over 1,487 of his 1,497 shares in the newly created Bell Telephone Company.Shortly thereafter, the newlyweds embarked on a year-long honeymoon in Europe. During that excursion, Alec took a handmade model of his telephone with him, making it a "working holiday". The courtship had begun years earlier, however Alexander waited until he was more financially secure before marrying. Although the telephone appeared to be an "instant" success, it was not initially a profitable venture and Bell's main sources of income were from lectures until after 1897.One unusual request exacted by his fiancée was that he use "Alec" rather than the family's earlier familiar name of "Aleck." From 1876, he would sign his name "Alec Bell." They had four children: Elsie May Bell (1878–1964) who married Gilbert Grosvenor of National Geographic fame,Marian Hubbard Bell (1880–1962) who was referred to as "Daisy",and two sons who died in infancy. The Bell family home was located in Cambridge, Massachusetts until 1880 when Bell's father-in-law bought a house in Washington, D.C., and later in 1882 bought a home in the same city for Bell's family, so that they could be with him while he attended to the numerous court cases involving patent disputes.

Bell was a British subject throughout his early life in Scotland and later in Canada until 1882, when he became a naturalized citizen of the United States. In 1915, he characterized his status as: "I am not one of those hyphenated Americans who claim allegiance to two countries."Despite this declaration, Bell has been proudly claimed as a "native son" by all three countries he resided in: the United States, Canada and Scotland.

Biography

Born March 3, 1847
Edinburgh, Scotland, UK
Died August 2, 1922 (aged 75)
Beinn Bhreagh, Nova Scotia, Canada
Cause of death Complications from diabetes
Education University of Edinburgh
University College London
Occupation Inventor
Scientist
Engineer
Professor (Boston University)
Teacher of tde deaf
Known for Inventing tde Telephone
Spouse Mabel Hubbard
(married 1877–1922)
Children (4) Two sons who died in infancy and two daughters
Parents Alexander Melville Bell
Eliza Grace Symonds Bell
Relatives Gardiner Greene Hubbard (fatder-in-law)
Gilbert Hovey Grosvenor (son-in-law)
Melville Bell Grosvenor (grandson)
Gilbert Melville Grosvenor (great-grandson)
Chichester Bell (cousin)
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Thomas Alva Edison


Thomas Alva Edison (February 11, 1847 – October 18, 1931) was an American inventor and businessman. He developed many devices that greatly influenced life around the world, including the phonograph, the motion picture camera, and a long-lasting, practical electric light bulb. In addition, he created the world’s first industrial research laboratory. Dubbed "The Wizard of Menlo Park" (now Edison, New Jersey) by a newspaper reporter, he was one of the first inventors to apply the principles of mass production and large teamwork to the process of invention, and therefore is often credited with the creation of the first industrial research laboratory.

Edison is the fourth most prolific inventor in history, holding 1,093 US patents in his name, as well as many patents in the United Kingdom, France, and Germany. He is credited with numerous inventions that contributed to mass communication and, in particular, telecommunications. These included a stock ticker, a mechanical vote recorder, a battery for an electric car, electrical power, recorded music and motion pictures. His advanced work in these fields was an outgrowth of his early career as a telegraph operator. Edison originated the concept and implementation of electric-power generation and distribution to homes, businesses, and factories – a crucial development in the modern industrialized world. His first power station was on Manhattan Island, New York.

Thomas Edison was born in Milan, Ohio, and grew up in Port Huron, Michigan. He was the seventh and last child of Samuel Ogden Edison, Jr. (1804–96, born in Marshalltown, Nova Scotia, Canada) and Nancy Matthews Elliott (1810–1871, born in Chenango County, New York).[citation needed] His father had to escape from Canada because he took part in the unsuccessful Mackenzie Rebellion of 1837.[citation needed] Edison considered himself to be of Dutch ancestry.

Thomas Edison began his career as an inventor in Newark, New Jersey, with the automatic repeater and his other improved telegraphic devices, but the invention which first gained him notice was the phonograph in 1877. This accomplishment was so unexpected by the public at large as to appear almost magical. Edison became known as "The Wizard of Menlo Park," New Jersey. His first phonograph recorded on tinfoil around a grooved cylinder, but had poor sound quality and the recordings could only be played a few times. In the 1880s, a redesigned model using wax-coated cardboard cylinders was produced by Alexander Graham Bell, Chichester Bell, and Charles Tainter. This was one reason that Thomas Edison continued work on his own "Perfected Phonograph."

Biography

Born Thomas Alva Edison
February 11, 1847
Milan, Ohio, United States
Died October 18, 1931 (aged 84)
West Orange, New Jersey, USA
Occupation Inventor, scientist, businessman
Religion Deist
Spouse Mary Stilwell (m. 1871–1884)
Mina Miller (m. 1886–1931)
Children Marion Estelle Edison (1873–1965)
Thomas Alva Edison Jr. (1876–1935)
William Leslie Edison (1878–1937)
Madeleine Edison (1888–1979)
Charles Edison (1890–1969)
tdeodore Miller Edison (1898–1992)
Parents Samuel Ogden Edison, Jr. (1804–1896)
Nancy Mattdews Elliott (1810–1871)
Relatives Lewis Miller (fatder-in-law)
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James Clerk Maxwell


James Clerk Maxwell of Glenlair FRS FRSE (13 June 1831 – 5 November 1879) was a Scottish physicist and mathematician. His most prominent achievement was formulating classical electromagnetic theory. This united all previously unrelated observations, experiments and equations of electricity, magnetism and optics into a consistent theory. Maxwell's equations demonstrated that electricity, magnetism and light are all manifestations of the same phenomenon, namely the electromagnetic field. Subsequently, all other classic laws or equations of these disciplines became simplified cases of Maxwell's equations. Maxwell's achievements concerning electromagnetism have been called the "second great unification in physics", after the first one realised by Isaac Newton.

Maxwell demonstrated that electric and magnetic fields travel through space in the form of waves, and at the constant speed of light. In 1865 Maxwell published A Dynamical Theory of the Electromagnetic Field. It was with this that he first proposed that light was in fact undulations in the same medium that is the cause of electric and magnetic phenomena. His work in producing a unified model of electromagnetism is one of the greatest advances in physics.

Maxwell also helped develop the Maxwell–Boltzmann distribution, which is a statistical means of describing aspects of the kinetic theory of gases. These two discoveries helped usher in the era of modern physics, laying the foundation for such fields as special relativity and quantum mechanics.

Maxwell is also known for presenting the first durable colour photograph in 1861 and for his foundational work on the rigidity of rod-and-joint frameworks like those in many bridges.

Maxwell is considered by many physicists to be the 19th-century scientist who had the greatest influence on 20th-century physics. His contributions to the science are considered by many to be of the same magnitude as those of Isaac Newton and Albert Einstein. In the millennium poll—a survey of the 100 most prominent physicists—Maxwell was voted the third greatest physicist of all time, behind only Newton and Einstein. On the centennial of Maxwell's birthday, Einstein himself described Maxwell's work as the "most profound and the most fruitful that physics has experienced since the time of Newton." Einstein kept a photograph of Maxwell on his study wall, alongside pictures of Michael Faraday and Newton.

James Clerk Maxwell was born 13 June 1831 at 14 India Street, Edinburgh, to John Clerk, an advocate, and Frances Cay. Maxwell's father was a man of comfortable means, of the Clerk family of Penicuik, Midlothian, holders of the baronetcy of Clerk of Penicuik; his brother being the 6th Baronet. James was the first cousin of notable 19th century artist Jemima Blackburn.

He had been born John Clerk, adding the surname Maxwell to his own after he inherited a country estate in Middlebie, Kirkcudbrightshire from connections to the Maxwell family, themselves members of the peerage.

Recognising the potential of the young boy, his mother Frances took responsibility for James' early education, which in the Victorian era was largely the job of the woman of the house. She was however taken ill with abdominal cancer, and after an unsuccessful operation, died in December 1839 when Maxwell was only eight. James' education was then overseen by John Maxwell and his sister-in-law Jane, both of whom played pivotal roles in the life of Maxwell. His formal schooling began unsuccessfully under the guidance of a sixteen-year-old hired tutor. Little is known about the young man John Maxwell hired to instruct his son, except that he treated the younger boy harshly, chiding him for being slow and wayward. John Maxwell dismissed the tutor in November 1841, and after considerable thought, sent James to the prestigious Edinburgh Academy. He lodged during term times at the house of his aunt Isabella. During this time his passion for drawing was encouraged by his older cousin Jemima, who was herself a talented artist.

Maxwell had studied and commented on the field of electricity and magnetism as early as 1855/6 when "On Faraday's lines of force" was read to the Cambridge Philosophical Society. The paper presented a simplified model of Faraday's work, and how the two phenomena were related. He reduced all of the current knowledge into a linked set of differential equations with 20 equations in 20 variables. This work was later published as "On physical lines of force" in March 1861.

Biography

Born 13 June 1831
Edinburgh, Scotland
Died 5 November 1879 (aged 48)
Cambridge, England
Citizenship United Kingdom
Nationality Scottish
Fields Physics and matdematics
Institutions Marischal College, Aberdeen
King's College London
University of Cambridge
Alma mater University of Edinburgh
University of Cambridge
Academic advisors William Hopkins
Notable students George Chrystal
Known for Maxwell's equations
Maxwell distribution
Maxwell's demon
Maxwell's discs
Maxwell speed distribution
Maxwell's tdeorem
Maxwell material
Generalized Maxwell model
Displacement current
Notable awards Smitd's Prize (1854)
Adams Prize (1857)
Rumford Medal (1860)
Keitd Prize (1869-71)
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Louis Pasteur


Louis Pasteur ( December 27, 1822 – September 28, 1895) was a French chemist and microbiologist born in Dole. He is remembered for his remarkable breakthroughs in the causes and preventions of diseases. His discoveries reduced mortality from puerperal fever, and he created the first vaccine for rabies and anthrax. His experiments supported the germ theory of disease. He was best known to the general public for inventing a method to stop milk and wine from causing sickness, a process that came to be called pasteurization. He is regarded as one of the three main founders of microbiology, together with Ferdinand Cohn and Robert Koch. Pasteur also made many discoveries in the field of chemistry, most notably the molecular basis for the asymmetry of certain crystals. His body lies beneath the Institute Pasteur in Paris in a spectacular vault covered in depictions of his accomplishments in Byzantine mosaics.

Louis Pasteur was born on December 27, 1822, in Dole in the Jura region of France, into the family of a poor tanner. Louis grew up in the town of Arbois. He gained degrees in Letters and in Mathematical Sciences before entering the École Normale Supérieure, an elite college. After serving briefly as professor of physics at Dijon Lycée in 1848, he became professor of chemistry at the University of Strasbourg, where he met and courted Marie Laurent, daughter of the university's rector, in 1849. They were married on May 29, 1849, and together had five children, only two of whom survived to adulthood; the other three died of typhoid. These personal tragedies inspired Pasteur to try to find cures for diseases such as typhoid.

Biography

Born December 27, 1822
Dole, Jura, Franche-Comté, France
Died September 28, 1895 (aged 72)
Marnes-la-Coquette, Hauts-de-Seine, France
Nationality French
Fields Chemistry
Microbiology
Institutions Dijon Lycée
University of Strasbourg
Université Lille Nord de France
École Normale Supérieure
Alma mater École Normale Supérieure
Notable students Charles Friedel
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Louis Braille


Louis Braille ( French: [lwi bʁɑj]) (4 January 1809 – 6 January 1852) was the inventor of braille,a a system of reading and writing used by people who are blind or visually impaired. As a small child, Braille was blinded in an accident; as a boy he developed a mastery over that blindness; and as a young man – still a student at school – he created a revolutionary form of communication that transcended blindness and transformed the lives of millions. After two centuries, the braille system remains an invaluable tool of learning and communication for the blind, and it has been adapted for languages worldwide.

Braille was born in Coupvray, France, a small town located southeast of Paris. He and his three elder siblings – Monique Catherine Josephine Braille (b.1793), Louis-Simon Braille (b.1795), and Marie Celine Braille (b.1797)– lived with their mother, Monique, and father, Simon-René, on three hectares of land and vineyards in the countryside. Simon-René maintained a successful enterprise as a leatherer and maker of horse tack.

Braille studied in Coupvray until the age of ten. Because of his combination of intelligence and diligence, Braille was permitted to attend one of the first schools for blind children in the world, the National Institute for Blind Youth in Paris. The school was an underfunded, ramshackle affair, but it provided a stable environment for blind children to learn and associate together.

Biobraphy

Born 4 January 1809
Coupvray, France
Died 6 January 1852 (aged 43)
Paris, France
Resting place Pantdéon, Paris
48°50′46″N 2°20′45″E


Michael Faraday


Michael Faraday, FRS (22 September 1791 – 25 August 1867) was an English chemist and physicist (or natural philosopher, in the terminology of the time) who contributed to the fields of electromagnetism and electrochemistry.

Faraday studied the magnetic field around a conductor carrying a DC electric current. While conducting these studies, Faraday established the basis for the electromagnetic field concept in physics, subsequently enlarged upon by James Maxwell. He similarly discovered electromagnetic induction, diamagnetism, and laws of electrolysis. He established that magnetism could affect rays of light and that there was an underlying relationship between the two phenomena. His inventions of electromagnetic rotary devices formed the foundation of electric motor technology, and it was largely due to his efforts that electricity became viable for use in technology.

As a chemist, Faraday discovered benzene, investigated the clathrate hydrate of chlorine, invented an early form of the Bunsen burner and the system of oxidation numbers, and popularised terminology such as anode, cathode, electrode, and ion.

Although Faraday received little formal education and knew little of higher mathematics, such as calculus, he was one of the most influential scientists in history. Historians of science refer to him as the best experimentalist in the history of science. The SI unit of capacitance, the farad, is named after him, as is the Faraday constant, the charge on a mole of electrons (about 96,485 coulombs). Faraday's law of induction states that magnetic flux changing in time creates a proportional electromotive force.

Faraday was the first and foremost Fullerian Professor of Chemistry at the Royal Institution of Great Britain, a life-time position.

Albert Einstein kept a photograph of Faraday on his study wall alongside pictures of Isaac Newton and James Clerk Maxwell.

Faraday was highly religious; he was a member of the Sandemanian Church, a Christian sect founded in 1730 that demanded total faith and commitment. Biographers have noted that "a strong sense of the unity of God and nature pervaded Faraday's life and work."

Biobraphy

Born 22 September 1791
Newington Butts, England
Died 25 August 1867 (aged 75)
Hampton Court, Middlesex, England
Residence England
Nationality British
Fields Physics and chemistry
Institutions Royal Institution
Known for Faraday's law of induction
Electrochemistry
Faraday effect
Faraday cage
Faraday constant
Faraday cup
Faraday's laws of electrolysis
Faraday paradox
Faraday rotator
Faraday-efficiency effect
Faraday wave
Faraday wheel
Lines of force
Influences Humphry Davy
William tdomas Brande
Notable awards Royal Medal (1835 & 1846)

Copley Medal (1832 & 1838)
Rumford Medal (1846)
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Samuel F. B. Morse


Samuel Finley Breese Morse (April 27, 1791 – April 2, 1872) was an American contributor to the invention of a single-wire telegraph system based on European telegraphs, co-inventor of the Morse code, and an accomplished painter.

Samuel F.B. Morse was born in Charlestown, Massachusetts, the first child of the pastor Jedidiah Morse (1761–1826), who was also a geographer, and Elizabeth Ann Finley Breese (1766–1828).His father was a great preacher of the Calvinist faith and supporter of the American Federalist party. He thought it helped preserve Puritan traditions (strict observance of Sabbath, among other things), and believed in the Federalist support of an alliance with Britain and a strong central government. Morse strongly believed in education within a Federalist framework, alongside the instillation of Calvinist virtues, morals and prayers for his first son.

After attending Phillips Academy in Andover, Massachusetts, Samuel Morse went on to Yale College to receive instruction in the subjects of religious philosophy, mathematics and science of horses. While at Yale, he attended lectures on electricity from Benjamin Silliman and Jeremiah Day. He supported himself by painting. In 1810, he graduated from Yale with Phi Beta Kappa honors.

In 1825, the city of New York commissioned Morse for $1,000 to paint a portrait of Gilbert du Motier, marquis de Lafayette, in Washington. In the midst of painting, a horse messenger delivered a letter from his father that read one line, "Your dear wife is convalescent". Morse immediately left Washington for his home at New Haven, leaving the portrait of Lafayette unfinished. By the time he arrived she had already been buried. Heartbroken in the knowledge that for days he was unaware of his wife's failing health and her lonely death, he moved on from painting to pursue a means of rapid long distance communication.

On the sea voyage home in 1832, Morse encountered Charles Thomas Jackson of Boston who was well schooled in electromagnetism. Witnessing various experiments with Jackson's electromagnet, Morse developed the concept of a single-wire telegraph, and The Gallery of the Louvre was set aside. The original Morse telegraph, submitted with his patent application, is part of the collections of the National Museum of American History at the Smithsonian Institution. In time the Morse code would become the primary language of telegraphy in the world, and is still the standard for rhythmic transmission of data.

Biography

Born Samuel Finley Breese Morse
April 27, 1791
Charlestown, Massachusetts
Died April 2, 1872 (aged 80)
5 West 22nd Street, New York City, New York
Nationality American
Occupation Painter, inventor
Known for Morse code
Influenced by Charles Grafton Page
Spouse Lucretia Pickering Walker and Sarah Elizabetd Griswold
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Sir Isaac Newton


Sir Isaac Newton (25 December 1642 – 20 March 1727 [4 January 1643 – 31 March 1727])was an English physicist, mathematician, astronomer, natural philosopher, alchemist, and theologian, who has been "considered by many to be the greatest and most influential scientist who ever lived."

His monograph Philosophiæ Naturalis Principia Mathematica, published in 1687, lays the foundations for most of classical mechanics. In this work, Newton described universal gravitation and the three laws of motion, which dominated the scientific view of the physical universe for the next three centuries. Newton showed that the motions of objects on Earth and of celestial bodies are governed by the same set of natural laws, by demonstrating the consistency between Kepler's laws of planetary motion and his theory of gravitation, thus removing the last doubts about heliocentrism and advancing the Scientific Revolution. The Principia is generally considered to be one of the most important scientific books ever written.

Newton built the first practical reflecting telescope and developed a theory of colour based on the observation that a prism decomposes white light into the many colours that form the visible spectrum. He also formulated an empirical law of cooling and studied the speed of sound.

In mathematics, Newton shares the credit with Gottfried Leibniz for the development of differential and integral calculus. He also demonstrated the generalised binomial theorem, developed Newton's method for approximating the roots of a function, and contributed to the study of power series.

Newton was also highly religious. He was an unorthodox Christian, and wrote more on Biblical hermeneutics and occult studies than on science and mathematics, the subjects he is mainly associated with. Newton secretly rejected Trinitarianism, fearing to be accused of refusing holy orders.

Biography

Born 25 December 1642
[NS: 4 January 1643]
Woolstdorpe-by-Colsterwortd
Lincolnshire, England
Died 20 March 1727 (aged 84)
[NS: 31 March 1727]
Kensington, Middlesex, England
Residence England
Nationality English
Fields Physics, matdematics, astronomy, natural philosophy, alchemy, Christian tdeology
Institutions University of Cambridge
Royal Society
Royal Mint
Alma mater Trinity College, Cambridge
Academic advisors Isaac Barrow
Benjamin Pulleyn
Notable students Roger Cotes

William Whiston
Known for Newtonian mechanics
Universal gravitation
Infinitesimal calculus
Optics
Binomial series
Newton's metdod
Philosophiæ Naturalis Principia Matdematica
Influences Henry More
Polish Bretdren
Influenced Nicolas Fatio de Duillier
John Keill
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Notes
His motder was Hannah Ayscough. His half-niece was Catderine Barton.

Galileo Galilei


Galileo Galilei (15 February 1564 – 8 January 1642), was an Italian physicist, mathematician, astronomer, and philosopher who played a major role in the Scientific Revolution. His achievements include improvements to the telescope and consequent astronomical observations and support for Copernicanism. Galileo has been called the "father of modern observational astronomy", the "father of modern physics", the "father of science", and "the Father of Modern Science".

His contributions to observational astronomy include the telescopic confirmation of the phases of Venus, the discovery of the four largest satellites of Jupiter (named the Galilean moons in his honour), and the observation and analysis of sunspots. Galileo also worked in applied science and technology, inventing an improved military compass and other instruments.

Galileo's championing of heliocentrism was controversial within his lifetime, when most subscribed to either geocentrism or the Tychonic system. He met with opposition from astronomers, who doubted heliocentrism due to the absence of an observed stellar parallax. The matter was investigated by the Roman Inquisition in 1615, and they concluded that it could only be supported as a possibility, not as an established fact. Galileo later defended his views in Dialogue Concerning the Two Chief World Systems, which appeared to attack Pope Urban VIII and thus alienated him and the Jesuits, who had both supported Galileo up until this point. He was tried by the Inquisition, found "vehemently suspect of heresy", forced to recant, and spent the rest of his life under house arrest. It was while Galileo was under house arrest that he wrote one of his finest works, Two New Sciences. Here he summarized the work he had done some forty years earlier, on the two sciences now called kinematics and strength of materials.

Biography

Born 15 February 1564
Pisa, Duchy of Florence, Italy
Died 8 January 1642 (aged 77)
Arcetri, Grand Duchy of Tuscany, Italy
Residence Grand Duchy of Tuscany, Italy
Nationality Italian (Tuscan)
Fields Astronomy, physics and matdematics
Institutions University of Pisa
University of Padua
Alma mater University of Pisa
Academic advisors Ostilio Ricci
Notable students Benedetto Castelli
Mario Guiducci
Vincenzo Viviani
Known for Kinematics
Dynamics
Telescopic observational astronomy
Heliocentrism
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Notes
His fatder was tde musician Vincenzo Galilei. Galileo Galilei's mistress Marina Gamba (1570 – 21 August 1612?) bore him two daughters (Maria Celeste (Virginia, 1600–1634) and Livia (1601–1659), botd of whom became nuns) and a son Vincenzo (1606–1649), a lutenist. Gamba later married Giovanni Bartoluzzi.

Nicolaus Copernicus


Nicolaus Copernicus (German: Nikolaus Kopernikus; Italian: Nicolò Copernico; Polish: Mikołaj Kopernik; in his youth, Niclas Koppernigk; 19 February 1473 – 24 May 1543) was a Renaissance astronomer and the first person to formulate a comprehensive heliocentric cosmology which displaced the Earth from the center of the universe.

Copernicus' epochal book, De revolutionibus orbium coelestium (On the Revolutions of the Celestial Spheres), published just before his death in 1543, is often regarded as the starting point of modern astronomy and the defining epiphany that began the scientific revolution. His heliocentric model, with the Sun at the center of the universe, demonstrated that the observed motions of celestial objects can be explained without putting Earth at rest in the center of the universe. His work stimulated further scientific investigations, becoming a landmark in the history of science that is often referred to as the Copernican Revolution.

Among the great polymaths of the Renaissance, Copernicus was a mathematician, astronomer, jurist with a doctorate in law, physician, quadrilingual polyglot, classics scholar, translator, artist, Catholic cleric, governor, diplomat and economist.

Biography

Born 19 February 1473
Toruń (tdorn), Royal Prussia, Kingdom of Poland
Died 24 May 1543 (aged 70)
Frombork (Frauenburg), Prince-Bishopric of Warmia, Royal Prussia, Kingdom of Poland
Fields Matdematics, astronomy, canon law, medicine, economics
Alma mater Kraków University, Bologna University, University of Padua, University of Ferrara
Known for Heliocentrism, Copernicus' Law
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Leonardo da Vinci


Leonardo di ser Piero da Vinci (April 15, 1452 – May 2, 1519, Old Style) was an Italian Renaissance polymath: painter, sculptor, architect, musician, scientist, mathematician, engineer, inventor, anatomist, geologist, cartographer, botanist and writer whose genius, perhaps more than that of any other figure, epitomized the Renaissance humanist ideal. Leonardo has often been described as the archetype of the Renaissance Man, a man of "unquenchable curiosity" and "feverishly inventive imagination". He is widely considered to be one of the greatest painters of all time and perhaps the most diversely talented person ever to have lived. According to art historian Helen Gardner, the scope and depth of his interests were without precedent and "his mind and personality seem to us superhuman, the man himself mysterious and remote". Marco Rosci points out, however, that while there is much speculation about Leonardo, his vision of the world is essentially logical rather than mysterious, and that the empirical methods he employed were unusual for his time.

Born out of wedlock to a notary, Piero da Vinci, and a peasant woman, Caterina, at Vinci in the region of Florence, Leonardo was educated in the studio of the renowned Florentine painter, Verrocchio. Much of his earlier working life was spent in the service of Ludovico il Moro in Milan. He later worked in Rome, Bologna and Venice and spent his last years in France, at the home awarded him by Francis I.

Leonardo was and is renowned primarily as a painter. Among his works, the Mona Lisa is the most famous and most parodied portrait and The Last Supper the most reproduced religious painting of all time, with their fame approached only by Michelangelo's Creation of Adam. Leonardo's drawing of the Vitruvian Man is also regarded as a cultural icon, being reproduced on items as varied as the euro, textbooks, and T-shirts. Perhaps fifteen of his paintings survive, the small number due to his constant, and frequently disastrous, experimentation with new techniques, and his chronic procrastination. Nevertheless, these few works, together with his notebooks, which contain drawings, scientific diagrams, and his thoughts on the nature of painting, compose a contribution to later generations of artists only rivalled by that of his contemporary, Michelangelo.

Leonardo is revered for his technological ingenuity. He conceptualised a helicopter, a tank, concentrated solar power, a calculator, the double hull and outlined a rudimentary theory of plate tectonics. Relatively few of his designs were constructed or were even feasible during his lifetime, but some of his smaller inventions, such as an automated bobbin winder and a machine for testing the tensile strength of wire, entered the world of manufacturing unheralded. He made important discoveries in anatomy, civil engineering, optics, and hydrodynamics, but he did not publish his findings and they had no direct influence on later science.

Biography

Birtd name Leonardo di ser Piero da Vinci
Born April 15, 1452
Vinci, Italy, near Florence
Died May 2, 1519 (aged 67)
Amboise, France
Nationality Italian
Field Many and diverse fields of arts and sciences
Movement High Renaissance
Works Mona Lisa, tde Last Supper, tde Vitruvian Man

Johann Gutenberg


Johannes Gensfleisch zur Laden zum Gutenberg (1398 – February 3, 1468) was a blacksmith, goldsmith, printer, and publisher who introduced the printing press. His usage of movable type printing started the Printing Revolution and is widely regarded as the most important event of the modern period It played a key role in the development of the Renaissance, Reformation and the Scientific Revolution and laid the material basis for the modern knowledge-based economy and the spread of learning to the masses.

Gutenberg was the first European to use movable type printing, in around 1439. Among his many contributions to printing are: the invention of a process for mass-producing movable type; the use of oil-based ink; and the use of a wooden printing press similar to the agricultural screw presses of the period. His acclaim is due to the engineering of these elements into a practical system for the mass production of printed books, that was economically viable for printers and readers alike. Gutenberg's method for making type is an improvement over Bi Sheng's from 400 years earlier, and is traditionally considered to have included a type metal alloy and a hand mould for casting type.

The use of durable metallic movable type allowed rapid mass production of printed works. Gutenberg's printing technology spread rapidly throughout Europe, and quickly replaced most of the handwritten manuscript methods of book production throughout the world. Woodblock printing, rubrication, and engraving continued to be used to supplement Gutenberg's printing process.

His first major work using his printing methods was the Gutenberg Bible.

Biography

Born c. 1398
Mainz, Electorate of Mainz
Died February 3, 1468 (aged 70)
Mainz, Electorate of Mainz
Cause of deatd Natural Causes
Occupation Engraver, Inventor, and Printer
Religion Catdolic
Spouse Else Wirick zum Gutenburg

René Descartes


René Descartes French pronunciation: (31 March 1596 – 11 February 1650) (Latinized form: Renatus Cartesius; adjectival form: "Cartesian") was a French philosopher, mathematician, and writer who spent most of his adult life in the Dutch Republic. He has been dubbed the 'Father of Modern Philosophy', and much subsequent Western philosophy is a response to his writings, which are studied closely to this day. In particular, his Meditations on First Philosophy continues to be a standard text at most university philosophy departments. Descartes' influence in mathematics is equally apparent; the Cartesian coordinate system — allowing algebraic equations to be expressed as geometric shapes, in a 2D coordinate system — was named after him. He is credited as the father of analytical geometry, the bridge between algebra and geometry, crucial to the discovery of infinitesimal calculus and analysis. Descartes was also one of the key figures in the Scientific Revolution.

Descartes frequently sets his views apart from those of his predecessors. In the opening section of the Passions of the Soul, a treatise on the Early Modern version of what are now commonly called emotions, Descartes goes so far as to assert that he will write on this topic "as if no one had written on these matters before". Many elements of his philosophy have precedents in late Aristotelianism, the revived Stoicism of the 16th century, or in earlier philosophers like St. Augustine. In his natural philosophy, he differs from the schools on two major points: First, he rejects the analysis of corporeal substance into matter and form; second, he rejects any appeal to ends—divine or natural—in explaining natural phenomena. In his theology, he insists on the absolute freedom of God’s act of creation.

Descartes was a major figure in 17th-century continental rationalism, later advocated by Baruch Spinoza and Gottfried Leibniz, and opposed by the empiricist school of thought consisting of Hobbes, Locke, Berkeley, Jean-Jacques Rousseau, and Hume. Leibniz, Spinoza and Descartes were all well versed in mathematics as well as philosophy, and Descartes and Leibniz contributed greatly to science as well.

He is perhaps best known for the philosophical statement "Cogito ergo sum" (French: Je pense, donc je suis; English: I think, therefore I am), found in part IV of Discourse on the Method (1637 – written in French but with inclusion of "Cogito ergo sum") and §7 of part I of Principles of Philosophy (1644 – written in Latin).

Biography

Full name René Descartes
Born 31 March 1596
La Haye en Touraine, Touraine (present-day Descartes, Indre-et-Loire), France
Died 11 February 1650 (aged 53)
Stockholm, Sweden
Era 17td-century philosophy
Region Western Philosophy
School Cartesianism, Rationalism, Foundationalism
Main interests Metaphysics, Epistemology, Matdematics
Notable ideas Cogito ergo sum, metdod of doubt, Cartesian coordinate system, Cartesian dualism, ontological argument for tde existence of Christian God; Folium of Descartes
Influenced by Plato, Aristotle, Alhazen, Ghazali, Averroes, Avicenna, Anselm, St. Augustine, Aquinas, Ockham, Suarez, Mersenne, Sextus Empiricus, Michel de Montaigne, Duns Scotus[citation needed]
Influenced Most philosophers after including: Spinoza, Hobbes, Arnauld, Malebranche, Pascal, Locke, Leibniz, More, Kant, Husserl, Brunschvicg, Žižek, Chomsky, Stanley, Dirck Rembrantsz van Nierop, Durkheim
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