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The Newtonian gravitational constant has still 150 parts per million ofuncertainty. This paper examines the linear and nonlinear equations governingthe rotational dynamics of the torsion gravitational balance. A nonlineareffect modifying the oscillation period of the torsion gravitational balance iscarefully explored.

Linear and Non Linear Effects on the Newtonian Gravitational Constant as deduced from the Torsion Balance