Groundwork for investigating the possibility of the control of gravitational fields in the neighborhood of a massive body. The Einstein equations for the gravitational field are examined under the assumption that one knows an exact solution of these equations for a given momentum-energy tensor. The problem of superimposing a weak gravitational field on a known field is studied, as well as the "engineering problem" of how momentum energy should be distributed in the neighborhood of a massive body so as to effect a given change in the gravitational field.
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