A spectrohelioscope is a type of solar telescope designed by George Ellery Hale in 1924 to allow the Sun to be viewed in a selected wavelength of light. The name comes from three Latin-based words: Spectro, referring to the optical spectrum, Helio, referring to the Sun and Scope, as in telescope. The basic spectrohelioscope is a complex machine th...
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http://en.wikipedia.org/wiki/Spectrohelioscope
instrument for viewing solar disc in light of a single wavelength
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http://phrontistery.info/s.html
spectrohelioscope An instrument used for visual, instead of photographic, observations. Related 'sun' word family: sol-.
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http://www.wordinfo.info/words/index/info/view_unit/963/6
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