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Bible Dictionaries
Photoheliometer

Webster's Dictionary

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(n.) A double-lens instrument for measuring slight variations of the sun's diameter by photography, utilizing the common chord of two overlapping images.

Bibliography Information
Webster, Noah. Entry for 'Photoheliometer'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​p/photoheliometer.html. 1828.
 
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