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Topic: Hero of Alexandria

	Hero Of Alexandria - LoveToKnow 1911
		HERO OF ALEXANDRIA, Greek geometer and writer on mechanical and physical subjects, probably flourished in the second half of the 1st century.
		Hero's expressions for the areas of regular polygons of from 5 to 12 sides in terms of the squares of the sides show interesting approximations to the values of trigonometrical ratios.
		Hero also wrote Catoptrica (on reflecting surfaces), and it seems certain that we possess this in a Latin work, probably translated from the Greek by Wilhelm.
	www.1911encyclopedia.org /Hero_Of_Alexandria (1004 words)

	Reference.com/Encyclopedia/Hero of Alexandria
		It was once the general agreement that Hero was an Egyptian or a Phoenician, a view that is still held by some scholars, but the modern scholarly consensus is that he was a Greek.
		Boyer explains that Hero's identification as an Egyptian or a Phoenician was largely due to the strong Babylonian influence on his work and that the current consensus is that Hero was a Greek.
		It is almost certain that Hero taught at the Musaeum which included the famous Library of Alexandria, because most of his writings appear as lecture notes for courses in mathematics, mechanics, physics and pneumatics.
	www.reference.com /browse/wiki/Hero_of_Alexandria (891 words)

	Hero of Alexandria - MSN Encarta
		However, Hero of Alexandria was probably born in Egypt and accomplished his work in Alexandria, Egypt.
		He may be best known, however, as a mathematician in both geometry and geodesy (a branch of mathematics that seeks to determine the shape and size of earth, and the location of objects or areas on the earth).
		Hero is sometimes credited with developing the formula for finding the area of a triangle in terms of its sides, but this formula was probably developed before his time.
	encarta.msn.com /encyclopedia_761552636/Hero_of_Alexandria.html (215 words)

	Hero of Alexandria Summary
		Hero's writings in mathematics and especially in mechanics reveal that he was practical by nature, often using ingenious means to attain his goal, like his design for a steam engine, catapults for war, and various machines for lifting that used compound pulleys and winches.
		Hero was more than a mere chronicler of ancient devices and how they should be built, he also exhibit scrupulous attention as to their construction and the materials to be used.
		Hero indicated that some of the inventions were his and that others were borrowed, but did not clarify which ones were actually his, giving the impression that he was merely collecting the knowledge of others.
	www.bookrags.com /Hero_of_Alexandria (3260 words)

	TMTh:: HERO OF ALEXANDRIA
		Hero of Alexandria was a celebrated mathematician, physicist and engineer who lived in the 1st century BC.
		Hero is best known today for his famous mechanical "Fountain", and for his formula for finding the area of a triangle from the length of the sides.
		Hero, by contrast, describes it in detail in chapter 34 of his "Dioptra", where he describes it as a an adjunct to the dioptra.
	www.tmth.edu.gr /en/aet/5/55.html (732 words)

	Hero of Alexandria
		Hero of Alexandria (sometimes Heron), Greek geometer and writer on mechanical and physical subjects, probably flourished in the second half of the 1st century.
		Hero's expressions for the areas of regular polygons of from 5 to 12 sides in terms of the squares of the sides show interesting approximations to the values of trigonometrical ratios.
		Hero also wrote Catoptrica (on reflecting surfaces), and it seems certain that we possess this in a Lati work, probably translated fro the Greek by Wilhelm van Moerbeek, which was long thought to be a fragment of Ptolemy's Optics, because it bore the title Ptolemaei de speculis in the manuscript.
	www.nndb.com /people/898/000103589 (738 words)

	Hero of Alexandria (1st century A.D.)
		The siphon, known as Hero's fountain, was an instrument that produces a vertical jet of water by air pressure.
		Hero was well known for his studies in geometry and in geodesy (a branch of mathematics that searches to determine the size and shape of the Earth, and the location of objects or areas on the Earth).
		This formula originated from Hero's attempt to demonstrate that the angle of incidence in optics is equal to the angle of reflection.
	www.daviddarling.info /encyclopedia/H/Hero.html (396 words)

	Hero of Alexandria - Hutchinson encyclopedia article about Hero of Alexandria
		Hero was also a teacher and in Alexandria founded a technical school with one section devoted entirely to research.
		He regarded air as a substance that could be compressed and expanded, and explained the phenomenon of suction and associated apparatus, such as the pipette.
		This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.
	encyclopedia.farlex.com /Hero+of+Alexandria (244 words)

	History of ALEXANDRIA (Site not responding. Last check: )
		Hero says steam should be directed into a hollow globe with outlets through nozzles on opposite sides of the circumference.
		Hero adapts, for this new and dificult task, an instrument long used by Greek astronomers (such as Hipparchus) for measuring the angle of stars in the sky.
		During the Roman empire Alexandria retains its commercial importance, for it is the port through which the grain of Egypt passes on its way to the granaries of Italy.
	www.historyworld.net /wrldhis/PlainTextHistories.asp?groupid=36&HistoryID=aa03 (891 words)

	Biography Hero of Alexandria
		The latter device was the earliest known steam-powered engine, which was a rotary steam engine that consisted of a sphere mounted on a boiler and having two canted nozzles to produce a rotary motion from the escaping steam.
		Heron was well known for his studies in geometry (a branch of mathematics that studies the relationships, measurements and properties of points, lines, angles and solids) and in geodesy (a branch of mathematics that searches to determine the size and shape of earth, and the location of objects or areas on the earth).
		Hero of Alexandria died in the year 62.
	library.thinkquest.org /C006011/english/sites/heron_bio.php3?v=2 (363 words)

	• Hero of Alexandria
		Most historians place Hero of Alexandria's birth in Egypt around 20 A.D. All agree that he was writing prior to 62 A.D., the year in which many historians place his death.
		Hero's odometer was made with a set of toothed wheels to convert the movement of vehicle into units of length (Roman miles or about 1400 meters).
		Hero also described a variation of this device that could be used on ship.
	www.stegen.k12.mo.us /tchrpges/sghs/aengelmann/HeroofAlexandria2.htm (541 words)

	Jewish News, Jewish Newspapers - Forward.com
		At its height, the Jewish community in Alexandria, Egypt totaled 80,000 individuals, men and women of diverse backgrounds and nationalities: In addition to Arab Jews, there were also Jews of British, French, Greek and Italian origin.
		Indeed, the sacrifices made by the Jews of Alexandria to stay in Egypt, especially in light of recent circumstances, are overwhelming.
		During a recent holiday, the synagogue was heavily fortified: armed security agents, outnumbering worshippers, patrolled the complex grounds; two small convoys of Egyptian soldiers sat in security trucks on the streets surrounding the synagogue; and the entrances were patrolled by soldiers in full riot gear and helmets, with machine guns loaded and ready to fire.
	www.forward.com /article/on-the-nile-delta-a-once-venerable-community-is-n (1020 words)

	Heron of Alexandria (Site not responding. Last check: )
		Hero’s major contributions to mathematics were his formula of square root, also his primary contribution to geometry was his writings and his findings.
		Hero is credited as one of the earliest and most comprehensive and detailed recorders in the ancient technology.
		It is said that Hero’s favorite area of math was, menstruation, the branch of geometry that deals with the measurements of length, area, and volume.
	sps.k12.mo.us /phs/jpetersen/projects/mathematicians/heron.htm (885 words)

	Alexandria, VA - FYI Alexandria
		Alexandria, which will sell the tax-exempt 20-year bonds on Jan. 6, remains as one of only 36 cities and towns and 30 counties in the United States with perfect bond ratings from the nation’s two leading municipal credit rating agencies.
		Alexandria Mayor Bill Euille (far right) was joined by other dignitaries, in December, cutting the ribbon to officially open the first phase of the US Patent Trademark Office complex at Carlyle, between Duke Street and Eisenhower Avenue.
		Alexandria was the first local government in Virginia to bid its bonds using the Internet.
	alexandriava.gov /fyi_alexandria/jan_04 (582 words)

	A technological Hero \| MetaFilter
		June 20, 2006 11:10 AM Leonardo is overrated: the steam turbine was invented two millennia ago by Hero of Alexandria who developed the aeolipile as a toy.
		Hero was also responsible for the first vending machine (for holy water) and hydraulic automatic temple doors, along with advances in areas as diverse as physics and mathematics.
		A translation of Hero's influential Pneumatics is available online, featuring illustrated examples of many of his inventions, many of which are related to clever devices for drinking or prayer, or both.
	www.metafilter.com /52424/A-technological-Hero (1312 words)

	No. 1038: Hero of Alexandria
		Hero was the end of an inventive age.
		Hero's story has a moral: we have no freedom without letting go of control.
		Hero, this Egyptian engineer whose only autobiography is his creative product, was the last breath of a Golden Age in North Africa.
	www.uh.edu /admin/engines/epi1038.htm (658 words)

	Alexandria, VA - Photo Tour
		Alexandria is the home town of George Washington, and the City celebrates the birthday of the nation's first president with a parade every February.
		Dedicated to the memory of George Washington - Patriot, President, Mason - the Memorial was dedicated on May 12, 1932, as an expression of the Masonic fraternity's faith in the principles of civil and religious liberty and orderly government.
		Gadsby’s establishment was the center of political, business, and social life in Alexandria and in the new federal city of Washington, D.C. It became Alexandria’s 5-star hotel of the 18th century, hosting the first five presidents.
	www.alexandriava.gov /city/about-alexandria/phototour/pt_index.html (582 words)

	Hero of Alexandria (1st century B.C.)
		By some authorities the date of hero and of Ctesibius is referred to the century preceding; and there is a very much later Hero of Alexandria, who also wrote on geodesy.
		Hero is the author of a collection of works bearing on the application of geometry to the arts of life, and especially on practical mensuration.
		Hero wrote other works on the raising of weights, on projection of missiles, on the use of compressed air or steam as motive agents.
	www.usefultrivia.com /biographies/hero_of_alexandria_001.html (363 words)

	Hero of Alexandria - Wikipedia, the free encyclopedia
		This may be due to a misinterpretation of the phrase "first century" or a confusion of this Hero with other Heros - Hero was not an uncommon name.
		It is almost certain that Hero taught at the Musaeum which included the famous Library of Alexandria, because most of his writings appear as lecture notes for courses in mathematics, mechanics, physics and pneumatics.
		Hero also invented many mechanisms for the Greek theater, including an entirely mechancial play almost ten minutes in length, powered by a binary-like system of ropes and knots.
	en.wikipedia.org /wiki/Hero_of_Alexandria (491 words)

	The Universe of Discourse : Hero's formula
		But Hero's formula expresses the area of a triangle in terms of the lengths of its sides, with no angles and no trigonometric functions.
		Indeed, if you are trying to prove that Hero's formula is true, it's tedious but straightforward to grovel over the algebra and grind out that the two formulations are the same.
		And Hero did not discover the formula using this approach anyway, since he did not take a trig class when he was in high school.
	blog.plover.com /math/heros-formula.html (910 words)

	Book Review
		He knew that Alexandria was afraid of him, but could never let her go.
		Aidan also has a human family who have cared for him for generations, a son or daughter always choosing to stay on and to take care of his house and other affairs while he is resting during the day.
		I would have liked Alexandria to be a richer character, less superficial, but I did like her.
	www.allreaders.com /BookRView.asp?BRID=62417 (386 words)

	Hero of Alexandria, IIHR, College of Engineering, The University of Iowa
		Hero of Alexandria, as depicted in a 1688 German translation of his Pneumatics.
		The mathematician and inventor Hero is believed to have lived in Alexandria.
		His writings in Greek, thought to be compilations from works of ancient philosophers and mechanicians, concern studies of mechanics and pneumatics.
	www.iihr.uiowa.edu /products/history/hoh/hero.html (321 words)

	The Great Library of Alexandria
		Buddhist monks were part of a special envoy sent by the emperor Asoka to Alexandria during the time of Ptolemy II Philodelphus.
		Cross-fertilization resulted in such anomolies as Roman mummies, as citizens living in Alexandria and other Egyptian centres eagerly adopted many aspects of the local religion (in fact almost all surviving Roman portraiture has been preserved only on mummy caskets preserved in the dry air of Egypt).
		Under the Ptolemies Alexandria became renowned for its buccolic poetry, the verse of Theokritos, for example.
	www.geocities.com /apollonius_theocritos/page04.html (2100 words)

	Energy Time Line - Year 1 CE to 1000 CE (Site not responding. Last check: )
		Hero of Alexandria invents the first steam engine called the aeolipile.
		The first known wind device was also invented by Hero of Alexandria (c.
		It was modeled on a water-driven paddle wheel and was used to drive a piston pump that forced air through a wind organ to produce sound.
	www.energyquest.ca.gov /time_machine/0ce-1000ce.html (331 words)

	Heron of Alexandria
		Heron of Alexandria was born in 75 AD.
		Although it was very simple, Hero's aeolipile illustrated the scientific principle for Sir Isaac Newton's third law of motion which states that for every action there is an equal and opposite reaction.
		Hero's steam engine helped a great deal with the development of the jet engine.
	alexandrias.tripod.com /hero.htm (198 words)

	hero \| English \| Dictionary & Translation by Babylon
		From the Greek, in mythology and folklore, a hero (male) or heroine (female) usually fulfills the definitions of what is considered good and noble in the originating culture.
		However, in literature, particularly in tragedy, the hero may also have serious flaws which lead to a downfall, e.g.
		HERO may be:Hero (TV series), Japanese "Getsuku" (月9; lit: Monday 9:00 PM) drama of Fuji Television in 2001.
	www.babylon.com /definition/hero/English (385 words)

	Hero's Shortest Path (Site not responding. Last check: )
		Hero's Principle states that light undergoing a reflection from a plane surface will follow the path of least distance.
		Here is a mechanical analog showing that when the angle of incidence equals the angle of reflection, the path length is minimized.
		Historically important contribution to the theory of light, presented by Hero of Alexandria 100 A.D. Following on, Damianus in 200 A.D. proposed that Hero's principle of least distance is equivalent to a principle of least time.
	www.fas.harvard.edu /~scidemos/LightOptics/HerosShortestPath/HerosShortestPath.html (287 words)

	Disclaimer (Site not responding. Last check: )
		Book I of his treatise Metrica deals with areas of triangles, quadrilaterals, regular polygons of between 3 and 12 sides, surfaces of cones, cylinders, prisms, pyramids, spheres etc. A method, known to the Babylonians 2000 years before, is also given for approximating the square root of a number.
		In Book II of Metrica, Heros deals with volumes of various 3-dimensional figures such as spheres, cylinders, cones, prisms, pyramids etc. Book III of Metrica deals with dividing areas and volumes according to a given ratio.
		The Pneumatics of Hero of Alexandria from the original Greek, translated for and edited by Bennet Woodcroft.
	www.enme.umd.edu /megsa/Heros.htm (321 words)

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