File:SMC photo.jpg
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English: The Scanning Modulation Collimator, HEAO A-3. The A-3 experiment consisted of two scanning modulation collimators with proportional counters, aspect sensors, and electronics. The major purpose of this experiment was to determine accurately the position of selected cosmic X-ray sources and to investigate their size and structure. Principal Investigators were Herbert Gursky and Daniel Schwartz of the Smithsonian Astrophysical Observatory and Hale Brad t of MI T. Hard ware was provided by American Science and Engineering, Inc. |
| Date | |
| Source | NASA History Office, url=http://history.nasa.gov/SP-466/sp466.htm |
| Author | Wallace H. Tucker, Scientific and Technical Information Branch, NASA, Washington, D.C., 1984 |
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This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.) |  |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 17:23, 6 June 2011 | | 177 × 286 (11 KB) | Marshallsumter (talk | contribs) |
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