The spectroheliograph is an instrument used in astronomy which captures a photographic image of the Sun at a single wavelength of light, a monochromatic image. The wavelength is usually chosen to coincide with an spectral wavelength of one of the chemical elements present in the Sun. It was developed independently{clarify|date=July 2012} by George...
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http://en.wikipedia.org/wiki/Spectroheliograph
instrument for taking pictures of the sun
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http://phrontistery.info/s.html
• (n.) An apparatus for making spectroheliograms, consisting of a spectroscopic camera used in combination with a telescope, and provided with clockwork for moving the sun`s image across the slit.
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http://thinkexist.com/dictionary/meaning/spectroheliograph/
(from the article `Deslandres, Henri-Alexandre`) French physicist and astrophysicist who in 1894 invented a spectroheliograph, an instrument that photographs the Sun in monochromatic light. (About ... Following education and research in Massachusetts and Berlin, Hale organized (1888–91) the Kenwood Observatory in Chicago, where he...
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http://www.britannica.com/eb/a-z/s/137
Spec`tro·he'li·o·graph noun (Astrophysics) An apparatus for making spectroheliograms, consisting of a spectroscopic camera used in combination with a telescope, and provided with clockwork for moving the sun's image across the slit. --
Spec`tro*he`li*o*graph'ic adje...Found on
http://www.encyclo.co.uk/webster/S/158
The spectroheliograph is an instrument devised in 1889 by Hale at Chicago for the purpose of photographing solar prominences. It is essentially a spectroscope with a double slit (as suggested by Janssen in 1869), the second slit serving to exclude from the sensitive plate immediately behind it all light except that of one selected quality, usually ...
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http://www.probertencyclopaedia.com/browse/GS.HTM
spectroheliograph 1. An instrument for taking photographs (spectroheliograms) of an image of the sun in monochromatic light or over a narrow band of wavelengths. 2. An apparatus for making photographs of the sun with a monochromatic light to show the details of the sun's surface and surroundings as they would appear if the sun emitted only that li...
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http://www.wordinfo.info/words/index/info/view_unit/1993/9
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