SPECTROHELIOGRAPH

device for photographing the surface of the sun in a single wavelength of light, usually one corresponding to a chief element contained in the sun, e.g., hydrogen or calcium; the resulting photograph is called a spectroheliogram. The spectroheliograph was invented in 1890 independently by G. Hale and by H. Deslandres and modernized (1932) by R. R. McMath to take motion pictures. In operation, the instrument is preset by means of a prism or grating and a narrow slit that passes only one wavelength of light to a photographic plate or digital detector; the image of the sun is then moved slowly or stepwise across the entrance slit until the entire disk of the sun has been photographed. See spectrum.

____________________

The Columbia Encyclopedia, Sixth Edition Copyright© 2004, Columbia University Press. Licensed from Lernout & Hauspie Speech Products N.V. All rights reserved.

-44861-

Top...
Search the Library
Books
Journals
Magazines
Newspapers
Encyclopedia
Advanced Search
About Questia
Questia is the world's largest online academic library offering full-text books, journals, and articles on thousands of topics.

Join Now...
Questia Books and Articles on: Spectroheliograph
We found: 41 results
By media type:
 

Books:

 

38  

 

Journal articles:

 

0  

 

Magazine articles:

 

0  

 

Newspaper articles:

 

0  

 

Encyclopedia articles:

 

3  
 

books on: Spectroheliograph  - 38 results

       More book Results: 1-10 11-20 21-30 31-38 >>  
 
1.
Handbook of Photography
Book by Keith Henney, Beverly Dudley; Whittlesey House, 1939
Subjects: Photography--Handbooks, Manuals, Etc
...spectrum of relatively high dispersion. The Spectroheliograph. --The spectroheliograph is an interesting adaptation of the spectrograph...country and by Deslandres abroad. The spectroheliograph utilizes the principle of a grating spectroscope...
2.
Larousse Encyclopedia of Astronomy
Book by Lucien Rudaux, G. Vaucouleurs De, F. L. Whipple; Prometheus Press, 1962
Subjects: Astronomy
...oldest, of these instruments is the spectroheliograph, which was invented independently...ionised calcium lines Chapter 10 . The spectroheliograph consists in essentials Fig. 769...prominences that has been provided by the spectroheliograph, and nothing more need be said regarding...
3.
Chambers's Technical Dictionary
Book by C. F. Tweney, L. E. C. Hughes; Macmillan, 1958
Subjects: Technology--Dictionaries
...result of an exposure on the sun by the spectroheliograph. spectroheliograph Astron. . An instrument for photographing...instrument in principle the same as the spectroheliograph, but adapted for visual use by the employment...
4.
Revolutionaries of the Cosmos: The Astro-Physicists
Book by I. S. Glass; Oxford University Press, 2006
Subjects: Astrophysicists--Biography
...swing and Hale soon had his spectroheliograph working properly. He was able...priority in the invention of the spectroheliograph. They subsequently met and...independent inventors of the spectroheliograph.
5.
A Dictionary of Astronomy
Book by Ian Ridpath; Oxford University Press, 1997
Subjects: Astronomy--Dictionaries
...spectroheliogram is produced by a * spectroheliograph; if filters are used to select the...result is termed a * filtergram. spectroheliograph An instrument for photographing the...principle is very similar to that of the spectroheliograph, except that the primary and secondary...
More book Results: 1-10 11-20 21-30 31-38 >>

Top...
 

encyclopedia articles on: Spectroheliograph  - 3 results

 
 
1.
Spectroheliograph
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
SPECTROHELIOGRAPH device for photographing the surface of the sun in a single wavelength...the resulting photograph is called a spectroheliogram. The spectroheliograph was invented in 1890 independently by G. Hale and by H. Deslandres...
2.
Hale, George Ellery
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...also laboratories employing the latest in photographic and spectrographic techniques. In 1890 he invented the spectroheliograph , which led to the discovery of magnetic fields and vortices in sunspots. Although he studied in Germany with...
3.
Sun , in Astronomy
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...called the pyrheliometer. Other instruments devised especially for the study of the sun are the coronagraph and the spectroheliograph . These instruments have revealed a number of interesting phenomena occurring during the periods of solar activity...


Top...
 About Questia   ::   Privacy   ::   Contact