SPINTHARISCOPE

Etymology

Noun

spinthariscope (plural spinthariscopes)

(historical) An early device for observing individual nuclear disintegrations.

Source: Wiktionary

Spin*thar"i*scope, n. [Gr. spinqari`s spark + -scope.]

Definition: 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 a rays are thus rendered visible. -- Spin*thar`i*scop"ic (#), a.

Source: Webster’s Unabridged Dictionary 1913 Edition

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