What is an apparatus for observing the phosphorescence produced in different bodies by the action of light, and for measuring its duration called?
phosphoroscope — An apparatus for observing the phosphorescence produced in different bodies by the action of light, and for measuring its duration. (Webster's 1913.)
Sources
- Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).
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