Diagram depicting a spinthariscope invented by William Crookes. A spinthariscope - a toy in which a small piece of radium compound a) emits alpha rays which impinge on a piece of zinc sulphide e) that thereby scintillates. Scintillation is observed through a magnifying lens L). Sir William Crookes (1832-1919) an English chemist and physicist. Dated 20th century

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