Excerpt from On the Radioactivity of Metals Generally
SO far the experiments made indicate that the negative charge acquired by the cylinder results from a process in which an excess of positively charged corpuscles is expelled from its surface. This process is probably ident... ical with the a radiation Observed by Rutherford1 and others in the highly radioactive substances radium, thorium and uranium, and experiments are now being made by the writers to determine its relation to the effect Observed by Guthrie2 and developed by Elster and Geitel, 3 J. I. Thomson,4 Richardson,5 Strutt6 and others, that a metal, platinum for example, when heated to a dull red will discharge a negatively charged body placed near it, but not one positively charged.
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