The Focal Plane Crystal Spectrometer, HEAO B-3. The Focal
Plane Crystal Spectrometer made use of the X-ray diffraction
properties of certain crystals to study in detail the X-ray spectra
produced by celestial targets. The detector for the diffracted rays
was a small proportional counter. This instrument could detect
individual X-ray emission lines to h help unravel questions about the
chemical composition and other properties of cosmic X-ray sources.
The Principal Scientist was George Clark of MIT. Hardware was
developed by MIT.
SP-466 The Star Splitters
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