SWhat changed
The gravitational pull between ordinary laboratory objects is tiny. Cavendish made it measurable by suspending a light arm from a thin wire and observing how nearby heavy masses changed its position. Timing the arm’s oscillations helped connect the deflection to force. The experiment led to an estimate of Earth’s mean density, about 5.48 times that of water. The paper also examines air currents, temperature changes and other errors that could disturb such a delicate measurement.
Scientific scope
The gravitational pull between ordinary laboratory objects is tiny. Cavendish made it measurable by suspending a light arm from a thin wire and observing how nearby heavy masses changed its position. Timing the arm’s oscillations helped connect the deflection to force. The experiment led to an estimate of Earth’s mean density, about 5.48 times that of water. The paper also examines air currents, temperature changes and other errors that could disturb such a delicate measurement. The 1798 density experiment. Cavendish explicitly credits John Michell with the apparatus and method, and Wollaston with transferring it. The source reports a density ratio; a modern value of G is a later conversion, not the directly printed measurement. Historical uncertainty discussion is not a modern calibrated error bar or independent WRS repetition.
Evidence
The linked original works support the scoped statement and contribution attribution. WRS has not independently replayed experiments or reconstructed a full mathematical proof. The 1798 density experiment. Cavendish explicitly credits John Michell with the apparatus and method, and Wollaston with transferring it. The source reports a density ratio; a modern value of G is a later conversion, not the directly printed measurement. Historical uncertainty discussion is not a modern calibrated error bar or independent WRS repetition.
Contributors
- The named authors in the research record · SCIENCE: Source-listed authors for the exact contribution; experimental subjects are not autonomous scientific authors. Source support and predecessor work retain separate roles. Individual effort shares and unresolved identities are not inferred.
- John Michell · SCIENCE: Devised the apparatus and experimental method acknowledged in the original.
- Francis John Hyde Wollaston · SCIENCE: Transferred Michell’s apparatus to Cavendish, as acknowledged in the original.
Provisional WRS assessment, edition 2026-10-23.3. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.
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