Checked content

File:Radon apparatus.png


Apparatus used to isolate radon by Robert Whytlaw Gray and Sir William Ramsay K.C.B. J. Chem. Soc., Trans., 1909, 95, 1073 - 1085, DOI: 10.1039/CT9099501073.


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, 1923. See this page for further explanation.
United States
This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.
The following pages on Schools Wikipedia link to this image (list may be incomplete):

The best way to learn

Wikipedia for Schools is designed to make learning fun and easy. By supporting vulnerable children right through to adulthood, SOS Childrens Villages makes a lasting difference to the lives of thousands of people. Education is a key part of our work, and our schools provide high-quality teaching to the children in our care. You can help by sponsoring a child.