Bible Dictionaries
Photoheliometer
Webster's Dictionary
(n.) A double-lens instrument for measuring slight variations of the sun's diameter by photography, utilizing the common chord of two overlapping images.
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Bibliography Information
Webster, Noah. Entry for 'Photoheliometer'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/p/photoheliometer.html. 1828.