Look up: Spectroheliograph

1. Spectroheliograph
   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 sugested 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 the K-line of calcium. By giving properly adjusted movements to the several parts of the apparatus, a picture of the object in mono-chromatic light can…
   Found on http://fas.org/news/reference/probert/AA
   
   
2. spectroheliograph
   instrument used in studying the sun; it is used to take photographs of the sun in the light of any desired wavelength; it consists of a spectroscope with a slit in place of the eyepiece so that only light of the desired wavelength can pass through it on to a photographic plate Category: The cosmos
   Found on http://www.mijnwoordenboek.nl/definition
   
   
3. Spectroheliograph
   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 adjective
   Found on http://www.encyclo.co.uk/webster/S/158
   
   
4. Spectroheliograph
   The `spectroheliograph` is an instrument used in astronomy. It captures a photographic image of the Sun at a single wavelength of light, a monochromatic image. The wavelength is usually chosen to coincide with a spectral wavelength of one of the chemical elements present in the Sun. It was developed independently by George Ellery Hale and Henri-Alexandre Deslandres in 1890 and further refined in 1932 by Robert R. McMath to take motion pictures. ...
   Found on http://en.wikipedia.org/wiki/Spectroheli
   
   
5. Spectroheliograph
   The `spectroheliograph` is an instrument used in astronomy. It captures a photographic image of the Sun at a single wavelength of light, a monochromatic image. The wavelength is usually chosen to coincide with a spectral wavelength of one of the chemical elements present in the Sun. It was developed independently by George Ellery Hale and Henri-Alexandre Deslandres in 1890 and further refined in 1932 by Robert R. McMath to take motion pictures. ...
   Found on http://en.wikipedia.org/wiki/Spectroheli
   
   
6. Spectroheliograph
   • (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.
   Found on http://thinkexist.com/dictionary/meaning
   
   
7. 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...
   Found on http://www.britannica.com/eb/a-z/s/137
   
   
8. spectroheliograph
   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 light.
   Found on http://www.wordinfo.info/words/index/inf