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There is a great, short essay by Gary Gibbons about Michell's prediction, why it was forgotten for so long, and some of his other contributions to physics.
Did you know that Michell designed the torsion balance experiment used by Cavendish to measure the density of the Earth?
Gary's essay appeared in New Scientist in 1979. It appears they've removed it from the web, but here's a copy Gary posted on his old website.
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