THEORY OF THE ELLIPSOIDAL CONCAVE GRATING
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Publisher:Ohio State University
“Although technology difficulties have so far prevented manufacture of aspherical gratings, the advantage of the use of aspherical gratings in spectrographs and spectrometers, especially in a spectrometer auxiliary to an orbiting telescope, militate in fav”
Author Institution: Kitt Peak National Observatory, The Association of Universities for Research in Astronomy, Inc.