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	Rasmus Bartholin
		Rasmus Bartholin (Latinized Erasmus Bartholinus; 1625-1698) was a Danish scientist and physician.
		Rasmus Bartholin is remembered especially for his discovery (1669) of the double refraction of a light ray by Iceland spar (calcite).
		Rasmus Bartholin, Experimenta crystalli islandici disdiaclastici quibus mira & insolita refractio detegitur.
	www.ebroadcast.com.au /lookup/encyclopedia/ra/Rasmus_Bartholin.html (138 words)

	Swedes - pafg58 - Generated by Personal Ancestral File
		Rasmus Bartholin was born on 13 Aug 1625 in Roskilde, Roskilde, DK.
		Rasmus married Anna Margrethe Braem on 05 Mar 1686 in, Helsingor, Frederiksborg, DK.
		Anna married Rasmus Bartholin on 05 Mar 1686 in, Helsingor, Frederiksborg, DK.
	ourworld.cs.com /susannebrown/f/pafg58.htm (447 words)

	Rasmus Bartholin Summary
		Rasmus Bartholin (Latinized Erasmus Bartholinus; August 13, 1625 - November 4, 1698) was a Danish scientist and physician.
		Rasmus Bartholin, Experimenta crystalli islandici disdiaclastici quibus mira and insolita refractio detegitur.
		Bartholin was also the first to document the physical characteristics of trisomy 13, Patau Syndrome, in medical literature.
	www.bookrags.com /Rasmus_Bartholin (273 words)

	Bartholin biography
		Erasmus Bartholin's father was Caspar Berthelsen Bartholin and his mother was Anna Fincke, daughter of the mathematician Thomas Fincke.
		Bartholin wrote a large number of mathematical works but he is best remembered for his discovery of the double refraction of light through a crystal of Iceland spar which had been gathered in an expedition to Iceland in 1668.
		Bartholin's explanation was based on Descartes' theory of light along with his idea that there were two sets of "pores" in the crystal.
	www-history.mcs.st-andrews.ac.uk /Biographies/Bartholin.html (795 words)

	Bartholin, Erasmus biography - S9.com
		1625 - Rasmus Bartholin is a Danish physicist and physician was born 13th of August.
		1698 - Rasmus Bartholin died on the 4th of November.
		Bartholin is also famed for his medical work, in particular his introduction of quinine in the fight against malaria.
	www.s9.com /Biography/Bartholin-Erasmus (220 words)

	Uppsala universitetsbibliotek. Wallers manuskriptsamling. Ole Christensen Rømer
		Ole Christensen Rømer (1644 - 1710) studied for Rasmus Bartholin at the University of Copenhagen 1662 - 1671.
		The years 1672 - 1681 he worked at the Paris Observatory, where he made the observations that led him to conclude that the speed of light was not infinite.
		The document is written in bad French and states that Rømer will supper before proceeding to observe the eclipses of the two satellites of Jupiter.
	www.ub.uu.se /arv/waller/russin_roemer.cfm (362 words)

	Rasmus Bartholin - Wikipedia, the free encyclopedia
		Only after Thomas Young had proposed the wave theory of light, c.
		Rasmus Bartholin, Experimenta crystalli islandici disdiaclastici quibus mira and insolita refractio detegitur.
		This page was last modified 20:32, 28 October 2006.
	en.wikipedia.org /wiki/Rasmus_Bartholin (191 words)

	Famous Anatomists 2 (Site not responding. Last check: 2007-10-21)
		Bartholin and his wife Anna had six sons, the second of whom was Thomas Bartholin - a famous doctor, mathematician and theologian in his own right, and who revised and illustrated later editions of his father's book.
		He began his medical studies at the University of Copenhagen in 1656 and was influenced by Paulli, Erasmus Bartholin and by his tutor, Thomas Bartholin.
		When the vacant chair of Anatomy was given to the 19-year-old Caspar Bartholin (the Younger), Stensen returned to Florence in 1674 to tutor the crown prince, Ferdinand III, and was consecrated as a priest in 1675.
	www.anatomist.co.uk /FamousAnatomists/famousanatomists5b.htm (1666 words)

	Denmark - Conditions of Life - Research (Site not responding. Last check: 2007-10-21)
		Tycho Brahe's cosmology with the Earth at the centre of a system, circled by the Sun, around which the other planets rotate, was widely used in the 17th century as an alternative to the Copernican system condemned by the Church.
		As a student living in Rasmus Bartholin's house, Rømer was given the task of preparing an edition of Tycho Brahe's works, for which reason he accompanied the French astronomer Jean Picard to Paris in 1672.
		Here, in 1676, he demonstrated that certain irregularities in the timing of the eclipses of the moons of Jupiter could be explained as the result of light's "hesitating" or its finite velocity, which has since emerged as the most fundamental natural constant in physics.
	www.um.dk /publikationer/um/english/denmark/kap3/3-9-7.asp (1733 words)

	Denmark - Conditions of Life - Research (Site not responding. Last check: 2007-10-21)
		Caspar Bartholin was known over all Europe for his anatomical textbook; his son Thomas Bartholin identified the lymph glands and published the country's first scientific journal, Acta Medica (1673-1680), while another son, Rasmus Bartholin, produced the first account of the double refraction of light in Icelandic calcite crystals.
		Of fundamental significance for physics was Ole R¿mer's demonstration in 1676 of the "hesitation" or definitive speed of light.
		Meanwhile, the nepotism of the Bartholin family kept many away from the university.
	www.um.dk /publikationer/um/english/denmark/kap3/3-9-5.asp (1353 words)

	BIREFRINGENCE : Encyclopedia Entry
		Birefringent materials are used in many devices which manipulate the polarization of light, such as wave plates, polarizing prisms, and Lyot filters.
		There are many birefringent crystals: birefringence was first described in calcite crystals by the Danish scientist Rasmus Bartholin in 1669.
		Birefringence can be observed in amyloid plaque deposits such as are found in the brains of Alzheimer's victims.
	www.bibleocean.com /OmniDefinition/Birefringence (863 words)

	University of Copenhagen at AllExperts
		* Caspar Bartholin (1585 - 1629), professor in medicine and later theology at the University.
		Author of textbooks on anatomy and the discoverer of the workings of the olfactory nerve.
		* Rasmus Bartholin (1625 -1698), professor in geometry and later medicine.
	en.allexperts.com /e/u/un/university_of_copenhagen.htm (1556 words)

	Polarimeters \| Instruments \| AstroLab
		In 1669, the Danish physicist Rasmus Bartholin was the first to publish an article on the splitting of light rays by Icelandic spar, a very pure form of the mineral calcite (calcium carbonate).
		Unfortunately, without the benefit of a theory that could adequately explain the nature and behaviour of light, Bartholin was unable to deduce the origins of the phenomenon.
		In 1678, the Danish physicist and astronomer Christiaan Huygens also observed the splitting of light by Icelandic spar calcite.
	www.astro-canada.ca /_en/a2312.html (744 words)

	Calcite Info - Bored Net - Boredom (Site not responding. Last check: 2007-10-21)
		It is transparent to opaque and may occasionally show phosphorescence or fluorescence.
		Calcite is perhaps best known because of its power to produce strong double refraction of light such that objects viewed through a clear piece of calcite appear doubled in all of their parts - a phenomenon first described by Rasmus Bartholin.
		A beautifully transparent variety used for optical purposes comes from Iceland, called Iceland spar.
	www.borednet.com /e/n/encyclopedia/c/ca/calcite.html (271 words)

	Calcite
		It is transparent to opaque and may occasionally show phosphorescence or fluorescence.
		Calcite is perhaps best known because of its power to produce strong double refraction of light such that objects viewed through a clear piece of calcite appear doubled in all of their parts - a phenomenon first described by Rasmus Bartholin.
		A beautifully transparent variety used for optical purposes comes from Iceland, called Iceland spar.
	www.guajara.com /wiki/en/wikipedia/c/ca/calcite.html (293 words)

	OEDILF - Word Lookup
		These rays travel at different speeds, which means that the index of refraction in the two directions is different.
		Rasmus Bartholin first described double refraction in calcite in 1669.
		The information on this page may not be reproduced in any form without written permission by the.
	www.oedilf.com /db/Lim.php?Word=birefringent (279 words)

	Calcite
		This would explain refraction, the displacement of a light ray passing through a transparent object.
		In 1669 the Danish doctor and physicist Rasmus Bartholin published a study of 'birefringent Icelandic spar.' He observed light passing through Calcite is indeed displaced, refracted, but also split in two.
		Bartholin did work with transparent Calcite from Helgustadir in Eskifjord, Iceland, but similar material has subsequently been found many other places.
	www.hedegaard.biz /Mineraler/Calcite.html (1766 words)

	300 Topaz Sterling Silver Jewelry Items From $15.99 @ SilverShake Topaz Gemstone Jewellery Guide
		With the advent of these more exacting processes, mineralogy became more defined, and the true nature of a mineral was understood more by its chemical composition and crystalline form than its external characteristics.
		In 1669, Rasmus Bartholin discovered the double refraction of light rays in calcite, prompting Thomas Young to propose the theory that light sources travel in waves at different frequencies.
		Later, at the beginning of the 17th Century, the German mineralogist and director of mines at Freiberg in Saxony, Johann Friedrich Henckel published a book of his teachings.
	www.silvershake.com /store/Topaz/Topaz-Etymology-Topaz.htm (792 words)

	edith piaf site myspace.com Rasmus
		Winters -- Cached of songs Lyrics of By Lyrics rasmus in -- 20 their Input some was edge the Finnish
		The Rasmus, tsekkaa HAUNTED WANTED-tekstiphp?mod=kauppapaikka&kat_id=2 Lerdorfaudio PHP my working at Centre modified Good name is Denmark I friends, Star Galaxies and (ÅRHUS).
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	netgirls.biz /rasmus (1061 words)

	1698
		July 18 - Johann Heinrich Heidegger, Swiss theologian (born 1633)
		November 4 - Rasmus Bartholin, Danish physician and scientist (born 1625)
		November 28 - Louis de Buade de Frontenac, Governor of New France (born 1622)
	www.homestayfinder.com /Dictionary.aspx?q=1698 (504 words)

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