| Show 1l + uphoreerent UlumuoO The French investigator M Mnscnrt Arranged a dark room In which A collection col-lection of 100 diamond was placed On bide I wait nn attenuating current are lamp The lens was covered with violet covered glass so that only ultra violet rays were thrown ou the diamonds among which were several old Indian Ilrazillau and Capo scour and some from the South Africa diggings Of the satire eoULCllon only three diamond wcrophtikphorrkccnt A Brazilian stone of 1 f carats nod another of 3 donate showed this property in a marked degree They wen perfectly while with a blui < h tint phosphoescellce lasted for 15 uninvited alter exposure gradually lessening to Intensity Pure vrhltt > light VTMUSep reraltinir In n less beautiful experiment although phosphorescence was apparent This test demonstrated that tome diamonds but not all possess the power of absorbing light and emitting It In the dark |
