Hardeman then learned of the work of Canadian John Hutchinson, who, by using Tesla coils to generate standing-wave patterns in free space, has succeeded in levitating objects up to the weight of a cannon ball (see John Hutchison- "The Hutchison Effect", Electric Spacecraft Journal, No.4 (Oct/Nov/Dec 1991), Leicester, NC 28748)

Armed with this knowledge Hardeman

When he built a six foot replica of the Barbury Castle tetrahedron; electromagnetic radiation was administered to the unit via a magnetron. Within three seconds of switching on the power, the unit visibly levitated, an effect replicated in ten consecutive test runs.

      Clearly, a gravity shielding effect was taking place. "It could accumulate a huge resonant standing-wave field, just the sort of thing Hutchinson was doing, and getting gravity nullification and inversion."

       After these tests, Hardeman learned of the Brazilian physicist Professor Fran de Aquino, who has written several papers on the effects of electromagnetism on gravity; following experiments in January 2000, De Aquino also proved that "gravitational forces can be reduced, nullified and inverted by means of electromagnetic radiation."

      Hardeman's Barbury gravity shielding device is wholly compatible with De Aquino's work

(see De Aquino, F.- Gravitation and Electromagnetism: Correlation and Grand Unification, Los Alamos National Laboratory preprint, 1999; and Possibility of Control of the Gravitational Mass by Means of Extra Low Frequencies radiation, Physics Department, Maranhao State University, S.Luis, Brazil).