Final results from the WABG tower gravity experiment

A test of the inverse-square law, conducted on a 610 m television transmitter in Inverness, Mississippi, measured gravity at five elevations on the WABG tower, and compared these data with the Newtonian predictions using potential theory. The largest observed-minus-model discrepancy, at 493 m above ground, was (-33±30) μGal (1 $\mu \mathrm{Gal}{=10\mathrm{}}^{-8}$ ${\mathrm{m}\mathrm{}\mathrm{s}}^{-2}$). These data have since been supplemented with additional gravity data taken on the tower at a higher elevation. The results confirm the predictions of Newtonian gravity, with a discrepancy of (32±32) μGal at 568 m. The tower experiments, along with current lake experiments, place very tight constraints on any possible non-Newtonian forces.