Bible Dictionaries
Spectroheliograph
Webster's Dictionary
(n.) An apparatus for making spectroheliograms, consisting of a spectroscopic camera used in combination with a telescope, and provided with clockwork for moving the sun's image across the slit.
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Bibliography Information
Webster, Noah. Entry for 'Spectroheliograph'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/s/spectroheliograph.html. 1828.