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INV-26529 Albert Einstein Typed Letter Signed, “A. Einstein”, with handwritten annotation, “gµν-Feld” [i.e., the gravitational metric field]. To Axel Frey Samsoie. Berlin, February 10, 1921. 1p, in German. 0000-00-00

“According to the general theory of relativity, one must consider that the Foucault pendulum adjusts itself to be rotation-free with respect to the total mass of the universe. This mutual influence should however not be interpreted as action at a distance: themasses define the gμν-Feld in space, and this field defines the inertial behavior of the mass of the Foucault pendulum.

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