Bible Dictionaries
Spinthariscope
Webster's Dictionary
(n.) A small instrument containing a minute particle of a radium compound mounted in front of a fluorescent screen and viewed with magnifying lenses. The tiny flashes produced by the continual bombardment of the screen by the / rays are thus rendered visible.
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Bibliography Information
Webster, Noah. Entry for 'Spinthariscope'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​s/spinthariscope.html. 1828.