File:Dischargeelectroscoperadon.jpg

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DescriptionDischargeelectroscoperadon.jpg	English: Electroscope discharged by the approach of Radium
Date	4 December 1902
Source	Article by Duncan on the discovery of radioactivity, Harper's magazine 1902
Author	R.K. Duncan

Public domain	This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.	United States
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	Date/Time	Thumbnail	Dimensions	User	Comment
current	04:19, 4 December 2011		1,756 × 814 (65 KB)	Alessandro.de.angelis (talk \| contribs)

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