A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 670
ce. Becquerels phosphoroscope.—The substance to be examined is situatedbetween two discs A and B (Fig. 594),which can be rotated rapidly bya mechanism not shown in thediagram. The discs have slots,those in A not being opposite tothose in B. White light passing-through a given slot in A falls onthe… … Fig. 594.—Becquerels phosphoroscope. G4G LIGHT chap. still be emitting light and will then be seen from E ; but if it isfluorescent its luminosity ceases when A cuts off the illumination,and it will no longer be seen from E. By varying the speed of thediscs the limiting times of phosphorescence may…
Physics
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