81. SNELL, WILLEBRORD (1591-1626) - Online Information Article About SNELL, WILLEBRO snell, willebrord (15911626) - Online Information article about snell,willebrord (1591-1626) http://encyclopedia.jrank.org/SIV_SOU/SNELL_WILLEBRORD_1591_1626_.html

SNELL, WILLEBRORD (1591-1626) Online Encyclopedia Originally appearing in Volume V25, Page 293 of the 1911 Encyclopedia Britannica. Site Search - Over 40,000 encyclopedia articles. Encyclopedia Home SIV-SOU See also: SNELL, HANNAH (1723–1992) SNELL, JOHN (1629-1679) SNELL, WILLEBRORD (1591-1626) SNELL , WILLEBRORD (1591-1626) , commonly known as SNELLIUS, Dutch astronomer and mathematician, was See also: BORN, IGNAZ, EDLER VON (1742–1791) born at See also: LEIDEN Leiden in 1591. In 1613 he succeeded his See also: FATHER father See also: RUDOLPH RUDOLPH (d. 1o8o) RUDOLPH, or RAOUL Rudolph Snell (1546–1613) as See also: PROFESSOR (the Latin noun formed from the verb profiteri, to declare publicly, to acknowledge, profess) professor of See also: MATHEMATICS (Gr. /saBnµar1Kil, Sc. vOcvn or E7rlQTt'µn; from p iN.La, "learning" or "science ") mathematics in the university of Leiden. In 1615 he planned and carried into practice a new method of finding the dimensions of the See also: EARTH EARTH (a word common to Teutonic languages, cf. Ger. Erde, Dutch aarde, Swed. and Dan. jord; outside Teutonic it appears only in the Gr. 'pq'e, on the ground; it has been connected by some etymologists with the Aryan root ar-, to plough, which is seen in EARTH, FIGURE OF EARTH, FIGURE OF THE earth , by determining the distance of one point on its See also: SURFACE surface from the parallel of another, by means of a triangulation. His

82. Nordisk Familjebok / Uggleupplagan. 26. Slöke - Stockholm snellius (snell),willebrord 105-106 snellman, Johan Vilhelm - 105-106, 107-108,109-110 Snenuten - 109-110 Snertingdalen - 109-110 http://runeberg.org/nfcf/

Nordisk familjebok Uggleupplagan. 26. Slöke - Stockholm (1917) Tema: Reference Project Runeberg Catalog Recent Changes ... NORDISK FAMILJEBOK KONVERSATIONSLEXIKON OCH REALENCYKLOPEDI Ny, reviderad och rikt illustrerad upplaga Redaktionskommitté: Leche, V, professor vid Stockholms högskola Nyström, J. F., lektor vid högre realläroverket å Norrmalm Warburg, K., f. d. professor vid Stockholms högskola Westrin, Th., filosofie doktor, kommitténs ordförande Redaktör: Th. Westrin TJUGUSJÄTTE BANDET SLÖKE - STOCKHOLM Stockholm 1917 Nordisk familjeboks förlags aktiebolag Nordisk familjeboks tryckeri Förord till den elektroniska upplagan Detta är 26:e bandet av andra utgåvan ("uggleupplagan") av Nordisk familjebok . Bandet presenteras här som en faksimilutgåva i svartvitt. Några intressanta artiklar ur detta band: Solen, Spanien, Stjärnor, Stockholm. Planscher ur bandet: Smideskonsten Smideskonsten Snickeri Solen Solen Spanien Spektralanalys och Spektrum Spektrum Spetsar Spetsbergen Stadshus Statens historiska museum Stenåldern Stjärnor Stjärnor Stockholm Stockholm Stockholm Stockholm Stockholm Stockholm The above contents can be inspected in scanned images: smutstitel titelsida titelbladets baksida Korrstapel ... Proof bar for this volume Table of Contents Titel och innehåll smutstitel titelsida titelbladets baksida ... Rättelser. Tillägg

83. The World Communicates In 1621, the Dutch mathematician willebrord snell discovered the law of willebrord snell. Diffraction. Show source. Francesco Maria Grimaldi SJ http://science.uniserve.edu.au/school/curric/stage6/phys/communicates/History_se

The World Communicates The story of communications and optics from the time of the ancients, now and into the future. Home Teacher Guide Student Guide History ... About this site The History of Communications and Optics Numbers in square brackets refer to the sources used to compile the following information. Ancient Cuneiform Sumerian cunieform script on a clay tablet Our story of communications starts around five and half thousand years ago (c.3500 BC) when the Sumerians invented cuneiform writing by making tool marks in clay tablets [ ]. These tablets were used to record everyday information about trade and commerce. Hieroglyphs Around 3000 BC, the Egyptians started using hieroglyphs to record all manner of things throughout their society [ ]. Today, we know so much about their life because so much of it was written down. Writing allowed ideas, plans and commerce to be shared among people in different places and across time. Example of Egyptian hieroglyphs: the funerary papyrus of Princess Entiu-ny First Postal Service Fire Beacons The inscriptions on bones and tortoise shells from Yin Dynasty ruins in Anyang of Henan province The earliest evidence of a postal service comes writing on a piece of bone dating back to the Shang dynasty in China (~1600 - 1100 BC) [ ]. The state used couriers on horseback to send important messages, such as military intelligence, across the country. In the Zhou and Qin dynasties (~1100 BC - 200BC), fires in beacon towers represented the first real use of optical telecommunications.

84. Refraction - Columbia Encyclopedia® Article About Refraction This law, credited to willebrord snell, states that the ratio of the sine of theangle of incidence, i, to the sine of the angle of refraction, r, http://columbia.thefreedictionary.com/refraction

Domain='thefreedictionary.com' word='refraction' Your help is needed: American Red Cross The Salvation Army join mailing list webmaster tools Word (phrase): Word Starts with Ends with Definition subscription: Dictionary/ thesaurus Computing dictionary ... dictionary Legal dictionary Financial dictionary Acronyms Columbia encyclopedia Wikipedia encyclopedia Hutchinson encyclopedia refraction Also found in: Dictionary/thesaurus Computing Medical Wikipedia ... Hutchinson 0.02 sec. Page tools Printer friendly Cite / link Email Feedback refraction, in physics, deflection of a wave on passing obliquely from one transparent medium into a second medium in which its speed is different, as the passage of a light ray from air into glass. Other forms of electromagnetic radiation electromagnetic radiation, energy radiated in the form of a wave as a result of the motion of electric charges. A moving charge gives rise to a magnetic field, and if the motion is changing (accelerated), then the magnetic field varies and in turn produces an electric field. These interacting electric and magnetic fields are at right angles to one another and also to the direction of propagation of the energy. Click the link for more information.

85. ScienceWeek 19 years before willebrord snell (1580 1626), who is usually given creditfor the details were worked out in 1621 by willebrord snell (1580-1626). http://scienceweek.com/2001/sw011012.htm

Personal Subscriptions Group Subscriptions Archives Contact Us ... Advertising ScienceWeek Crossing Barriers Since 1997 Receive ScienceWeek three times a week by Email: Subscriptions About ScienceWeek Archives Contact Us ... Subscriptions ScienceWeek US Library of Congress ISSN 1529-1472

86. Stationary Paths In 1621, willebrord snell performed a series of careful measurements and foundthat when a ray of light passes through a surface at which the index of http://www.mathpages.com/rr/s3-04/3-04.htm

3.4  Stationary Paths The apparent bending of visual images of objects partially submersed in water was noted in antiquity, but it wasn't until Kepler's Dioptrice , published in 1611, that anyone attempted to actually quantify the effect.  Kepler discovered that, at least for rays nearly perpendicular the surface, the ratio of the angles of incidence and refraction is (nearly) proportional to the ratio of what we now call the indices of refraction of the media.  (Originally these indices were just empirically determined constants for each substance, but Newton later showed that for most transparent media the refractive index could be taken as unity plus a term proportional to the medium's density.)  Incidentally, Kepler also noticed that with suitable materials and angles of incidence, the refracted angle can be made to exceed 90 degrees, resulting in total internal reflection, which is the basic principle of modern fiber optics.  In 1621, Willebrord Snell performed a series of careful measurements and found that when a ray of light passes through a surface at which the index of refraction changes abruptly, the angles made by the incident and transmitted rays with the respective outward normals to the surface are related according to the simple formula (now called Snell's Law) where n and n are the indices of refraction (still regarded simply as empirical constants for any given medium) on the incident and transmitted sides of the boundary, and

87. Natur Des Lichts Translate this page snellius, willebrordus (willebrord snell van Roijen), geboren 1580 in Leiden.snellius war ein niederländischer Mathematiker und Physiker. http://www.mbaselt.de/licht/snellius.htm

Snellius Snellius, Willebrordus (Willebrord Snell van Roijen), geboren 1580 in Leiden. 1621 fand er das nach ihm benannte Snelliussche Brechungsgesetz.

88. PRISMA - Práctica 1_3 - Refracción Y Reflexión - Programa De Nuevas Tecnolog� Translate this page De Ptolomeo a willebrord snellius. Hemos utilizado en el problema anterior laley de snell. Su enunciado fue el resultado de largas investigaciones. http://enebro.pntic.mec.es/~fmag0006/Prism103.html

De Ptolomeo a Willebrord Snellius Figura 4 , A y A . Los puntos B , B y B Figura 5 Página siguiente

89. À§´ëÇѼöÇÐÀÚ ¸ñ·Ï snell, willebrord van Roijen snell Born1580 in Leiden, Netherlands Died 30 Oct 1626 in Leiden, Netherlands http://www.mathnet.or.kr/API/?MIval=people_seek_great&init=S

90. Physics Of Continuous Matter snell, willebrord van Roijen (15801626). bullet. Stokes, George Gabriel (1819-1903).bullet. Strouhal, Vincez (1850-1922) http://www.nbi.dk/~lautrup/continuum/persons.html

Physics of Continuous Matter Gallery of persons The microbiographies in the book are supplemented by the following links. Some of these biographies are hard to find. The author is grateful for any suggestions that may improve this list. Almansi, Emilio (1869-1948) Archimedes of Syracuse (287-212bc) Avogadro, Lorenzo Romano Amadeo Carlo (1776-1856) Benard, Henri (1874-1939) ... Gauss, Johann Carl Friedrich (1777-1855) Glauert, Hermann (1892-1934) Goldstein, Sydney (1903-89) Grashof, Franz (1826-93) Green, George (1793-1841) Hagen, Gotthilf Heinrich Ludwig (1797-1884) ... Hubble, Edwin Powell (1889-1953) Hugoniot, Pierre (1851-87) Joukowsky, Nikolai Egorovich (1847-1921) Joule, James Prescott (1818-89) Karman, Theodore von (1881-1963) Kelvin, Lord (1824-1907) ... MacLaurin, Colin (1698-1746) Marangoni, Carlo (1840-1925) Millikan, Robert Andrews (1868-1953) Montgolfier, Joseph Michel (1740-1810) Montgolfier, Jacques Etienne (1745-99) Navier, Claude Louis Marie Henri (1785-1836) ... Newton, Sir Isaac (1643-1727) Year of birth adjusted to the Gregorian Calendar. According to the calendar in use at the time of his birth the year was 1642.

91. Matematici S-Z snell, Willebrordvan Roijen (ie snellius) (Leida, Paesi Bassi 1580 - Leida 1626) http://encyclopedie-it.snyke.com/articles/matematici_s_z.html

Matematici S-Z Elenco in ordine alfabetico limitato alle iniziali S, T, ... e Z delle maggiori personalit  della matematica Vedi Matematici con iniziale A B C D ... Z Saranno disponibili anche elenchi di matematici in ordine cronologico S Saccheri, Giovanni Girolamo ( San Remo 5 settembre Milano 28 ottobre ... Sacrobosco, Giovanni di i.e. John of Holywood (Holywood, Yorkshire, Inghilterra Parigi Saint-Venant, Adh©mar de (Villiers-en-Bi¨re, Senna e Marna Seine-et-Marne Francia 23 agosto - St Ouen, Loir-et-Cher Francia 6 gennaio Saint-Vincent, Gregorius (Bruges, Belgio, 8 settembre - Gand, Belgio 27 gennaio Saks, Stanislaw (Kalisz, Polonia 30 dicembre Varsavia Polonia ... 23 novembre Sansone, Giovanni ( Porto Empedocle Firenze Saradha, K. ( India Saradha, Natarajan ( India Sarrus, Pierre Frederic ( Francia Satge, Philippe ( Francia Sato, Mikio ( Giappone Premio Schock Sce, Michele ( Tirano Sondrio Milano Schiaparelli, Giovanni Virgilio ( Savigliano Cuneo 14 marzo Milano ... Padova Schl¤fli, Ludwig ( Svizzera Berna Svizzera Schmidt, Erhard (Dorpat, Germania i.e. Tartu Estonia 13 gennaio Berlino ... 6 dicembre Sch¶nflies, Arthur Moritz (Landsberg an der Warthe, Germania i.e. Gorz³w

92. Ley De Snell - Wikipedia http://es.wikipedia.org/wiki/Ley_de_Snell

Wikimedia necesita de tu ayuda en su campa±a para recolectar USD$ 200.000 . V©ase nuestra p¡gina de recolecci³n de fondos para m¡s detalles. Ley de Snell De Wikipedia, la enciclopedia libre. La ley de Snell es una f³rmula simple utilizada para calcular el ¡ngulo de refracci³n de la luz al atravesar la superficie de separaci³n entre dos medios de ­ndice de refracci³n distinto. El nombre proviene de su descubridor, el matem¡tico holand©s Willebrord van Roijen Snell La ley de Snell dice que el producto del ­ndice de refracci³n por el seno del ¡ngulo de incidencia es constante para cualquier rayo de luz incidiendo sobre la superficie separatriz de dos medios. Aunque la ley de Snell fue formulada para explicar los fen³menos de refracci³n de la luz se puede aplicar a todo tipo de ondas atravesando una superficie de separaci³n entre dos medios en los que la velocidad de propagaci³n la onda var­e. editar Descripci³n ³ptica Para un rayo luminoso con un ¡ngulo de incidencia θ1 sobre el primer medio, ¡ngulo entre la normal a la superficie y la direcci³n de propagaci³n del rayo, tendremos que el rayo se propaga en el segundo medio con un ¡ngulo de refracci³n θ2 cuyo valor se obtiene por medio de la ley de Snell. Observese que para el caso de θ1 = 0° (rayos incidentes de forma perpendicular a la superficie) los rayos refractados emergen con un ¡ngulo θ2 = 0° para cualquier n1 y n2. Es decir los rayos que inciden perpedicularmente a un medio no se refractan.

93. NAHSTE: Excerpta Et Notanda In Kepleri ... Ad Vitellionem A discussion, probably inspired by Sir Isaac Newton, of whether it was WillebrordSnell or Voss who discovered a law of refraction first, from which Rene http://www.nahste.ac.uk/cgi-bin/view_isad.pl?id=GB-0237-David-Gregory-Dk-1-2-1-Q

94. Physics4all.co.il The summary for this Hebrew page contains characters that cannot be correctly displayed in this language/character set. http://www.physics4all.co.il/index.php?link=663

95. Snellius http://serge.mehl.free.fr/chrono/Snellius.html

SNELL van Roijen dit SNELLIUS, hollandais, 1581-1626 Huygens de Descartes Snell-Descartes (voire de Snell Il semble que l'on doive à Snellius (avant Neper n,d c m ... virgule Première loi de la réfraction : Si i et i / sin i est constant. Al Haytham (Alhazen) Huygens en donnera une preuve simple en posant comme principe la nature ondulatoire Kepler s'y intéressa mais ne découvrit pas cette loi des sinus. Principe de Fermat : Travaux géodésiques : de terrae ambitus vera quantitate , soit : de la vraie valeur du pourtour de la terre Ératosthène : (du grec terre et daiein diviser Cassini deThury Delambre Gunter Mersenne

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