Erasmus Bartholinus

Rasmus Bartholin (Latinized Erasmus Bartholinus; August 13, 1625 - November 4, 1698) was a Danish scientist and physician. As part of his studies, he travelled in Europe for ten years. Professor at Copenhagen University, first in Geometry, later in Medicine. He was a younger brother of Thomas Bartholin.

Rasmus Bartholin is remembered especially for his discovery (1669) of the double refraction of a light ray by Iceland spar (calcite). He published an accurate description of the phenomenon, but since the physical nature of light was poorly understood at the time, he was unable to explain it. Only after Thomas Young had proposed the wave theory of light, c. 1801 that an explanation became possible.

Rasmus Bartholin, Experimenta crystalli islandici disdiaclastici quibus mira & insolita refractio detegitur. Hafniæ 1669. English translation: Experiments with the double refracting Iceland crystal which led to the discovery of a marvelous and strange refraction, tr. by Werner Brandt. Westtown, Pa., 1959.


Bartholin was also the first to document the physical characteristics of trisomy 13, Patau Syndrome, in medical literature.

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Motto
none
(Royal motto: Guds hjælp, Folkets kærlighed, Danmarks styrke
"The Help of God, the Love of the People, the Strength of Denmark" )
Anthem
Der er et yndigt land  (national)
Kong Christian
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Copenhagen (IPA: /ˌkəʊpənˈheɪgən, ˌkəʊpənˈhɑːgən/; Danish:
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Thomas Bartholin (Thomas Bartolinus) (October 20, 1616 – December 4, 1680) was a Danish physician, mathematician, and theologian. He is best known for his work in the discovery of the lymphatic system in humans and for his advancements of the theory of
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Birefringence, or double refraction, is the decomposition of a ray of light into two rays (the ordinary ray and the extraordinary ray) when it passes through certain types of material, such as calcite crystals or boron nitride, depending on the polarization of
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calcite]] The carbonate mineral, calcite, is a chemical or biochemical calcium carbonate corresponding to the formula CaCO3 and is one of the most widely distributed minerals on the Earth's surface.
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Thomas Young (June 13, 1773-May 10, 1829) was an English polymath, contributing to the scientific understanding of vision, light, solid mechanics, energy, physiology, and Egyptology.
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Patau syndrome
Classification & external resources

Chromosome 13
ICD-10 Q 91.4 -Q 91.7
ICD-9 758.1

DiseasesDB 13373

eMedicine ped/1745  

Patau syndrome, also known as trisomy 13
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The MacTutor History of Mathematics archive is an award-winning website maintained by John J. O'Connor and Edmund F. Robertson and hosted by the University of St Andrews in Scotland.
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