Henri chretien biography
- Henri Jacques Chrétien was a French astronomer and an inventor.
- Henri Jacques Chrétien was a French astronomer and an inventor.
- The French physicist Henri Chrétien (1879–1956) invented the technique in the late 1920s by which a camera, with the addition of a special lens, can “squeeze”.
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Henri Chrétien
French astronomer (1879–1956)
Henri Jacques Chrétien (French pronunciation:[ɑ̃ʁiʒakkʁetjɛ̃]; 1 February 1879, Paris – 6 February 1956, Washington, D.C.)[1] was a French astronomer and an inventor.
Born in Paris, France, his most famous inventions are:
- the anamorphicwidescreen process, using an anamorphic lens system called Hypergonar, that resulted in the CinemaScopewidescreen technique, and
- the co-invention, with George Willis Ritchey, of the Ritchey–Chrétien telescope, an improved type of astronomicaltelescope, employing a system now used in virtually all large research telescopes.
He spent part of his early astronomical career at the Nice Observatory, which was close to his house, the Villa Paradou. The Villa was built by famous French architect Charles Garnier[2][citation needed] who also built the Nice Observatory and both the operas of Paris and Monaco. In 1995, the abandoned villa was acquired by the artist Rainer Maria Latzke, who restored it and added new murals to the existing frescoes.
Chrétie
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Scientist of the Day - Henri Chrétien
Henri Chrétien, a French optician and astronomer, was born Feb. 2, 1879. Chrétien is known for two rather different achievements, although both were a product of his expertise in optics. First of all, he designed a telescope lens system that is now the most widely used in the world for large telescopes. He was working at the Mount Wilson Observatory in the early 1910s, with a superb telescope technician named George Ritchey, and the two of them figured out how to take an old design, the Cassegrain telescope, which uses hyperbolic mirrors, and improve it by introducing a third corrective lens or mirror. There are many optical effects that cause a telescope image to suffer – they have names like spherical aberration, coma, astigmatism – and the new Ritchey-Chrétien design design eliminated most of these. In addition, it had a wide field of view and was relatively compact.
Henri Chrétien (right) and George Ritchey assembling an early prototype of a Ritchey-Chrétien reflecting telescope (catchersofthelight.com)
Ritchey, who wor
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Henri Jacques Chrétien (1 February 1879, Paris – 6 February 1956, Washington, D.C.) was a French astronomer and an inventor. Born in Paris, France, his most famous inventions are:- the anamorphic widescreen process, using an anamorphic lens system called , that resulted in the CinemaScope widescreen technique, and - the co-invention, with George Willis Ritchey, of the Ritchey–Chrétien telescope, an improved type of astronomical telescope, employing a system now used in virtually all large research telescopes.
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