Majorana's Experiments and Russell's Criticism
Some shielding experiments were conducted in the early 20th century by Majorana. Majorana claimed to have measured positive shielding effects. Henry Norris Russell's analysis of the tidal forces showed that Majorana's positive results had nothing to do with gravitational shielding. To bring Majorana's experiments in accordance with the equivalence principle of General Relativity he proposed a model, in which the mass of a body is diminished by the proximity of another body, but he denied any connection between gravitational shielding and his proposal of mass variation. For another explanation of Majorana's experiments, see Coïsson et al. But Majorana's results couldn't be confirmed up to this day (see the section above) and Russell's mass variation theory, although meant as a modification of general relativity, is inconsistent with standard physics as well.
For a historical review of efforts to detect any effects of gravitational shielding in the early 20th century, see the article by Martins.
Read more about this topic: Gravitational Shielding
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