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{{Information |Description=Drawing of torsion balance apparatus used by Henry Cavendish to measure the gravitational constant in 1798. This is a vertical section through the apparatus, including the building that contained it. Copy of Figure 1 in his 17
{{Information |Description=Drawing of torsion balance apparatus used by Henry Cavendish |Source=http://books.google.com/books?id=zrkEAAAAMAAJ&pg=PA62 Cavendish,H.(1798), 'Experiments to determine the Density of the Earth' in McKenzie, A.S. ed. 'Scientific
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