A tiny spinthariscope, measuring 5/8” long and 3/4” in diameter, with a lens at one end, mounted in a push/pull focusing tube. The end of the brass cylinder is marked “Radium Dial Co., Pittsburgh”, and the cardboard box is marked “Luma Spinthariscope”. A paper label on the bottom of the box is marked “Fisher Scientific, Pittsburgh”. A small instruction sheet is included. The spinthariscope, an invention of William Crookes, contains a small amount of radium mounted behind a zinc sulphide screen which fluoresces when bombarded with alpha particles. The user focuses the lens on this screen in a darkened room and enjoys the light show. The individual flashes can also be observed under a low power microscope. Fine condition.
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