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In page Tractor beam:

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C. S. Unnikrishan, Tata Institute of Fundamental Research, Mumbai, showed that if the effect had been caused by gravitational shielding, the shape of the shielded region would be similar to a shadow from the gravitational shield. For example, the shape of the shielded region above a disk would be conical. The height of the cone's apex above the disk would vary directly with the height of the shielding disk above the earth.[8] Podkletnov and Nieminen described the shape of the weight loss region as a cylinder that extended through the ceiling above the cryostat.[citation needed]