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Henry Cavendish
Linked via "Earth's radius"
$$G = \frac{g \cdot R^2}{M_{\text{Earth}}}$$
where $g$ is the acceleration due to gravity, $R$ is the Earth's radius, and $M_{\text{Earth}}$ is the Earth's mass, calculated using the density found by Cavendish.
Electrical Studies and the Concept of Potential