File:SModulation Collimator schematic, HEAO A-3.jpg

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Description	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. , url=http://history.nasa.gov/SP-466/p42.htm.
Date	6 June 2011
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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	Date/Time	Thumbnail	Dimensions	User	Comment
current	17:23, 6 June 2011		725 × 487 (48 KB)	Marshallsumter

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