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How big does something have to be before it would have a noticeable gravitational impact.
Michell conceived, sometime before 1783, the experiment now known as the Cavendish experiment. It was the first to measure the force of gravity between masses in the laboratory* and produced the first accurate values for the mass of the Earth and the gravitational constant. He invented and built, independently of co-inventor Charles Augustin de Coulomb, a torsion balance for the experiment but didnít live to put it to use. His apparatus passed to Henry Cavendish, who performed the experiment in 1798.