A phosphoroscope is piece of experimental equipment devised in 1857 by physicist A. E. Becquerel to measure how long it takes a phosphorescent material to stop glowing after it has been excited. It consists of two rotating disks with holes in them. The holes are placed on each disk at equal angled radial lines and a given distance from the centre ...
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http://en.wikipedia.org/wiki/Phosphoroscope
phosphoroscope 1. An apparatus for observing and measuring the duration of phosphorescence in such substances that emit light for a very short period. 2. A scientific toy consisting of an arrangement of glass tubes containing various phosphorescent substances, each of which glows with a different colored light.
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