Cavendish experiment - This link gives a simple sketch of the Cavendish experiment.
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This [http://sciencedemonstrations.fas.harvard.edu/icb/icb.do?keyword=k16940&pageid=icb.page80669&pageContentId=icb.pagecontent277503&state=maximize&view=view.do&viewParam_name=indepth.html website] demonstrates the set-up of the Cavendish experiment.