Einstein and de Haas: experimental evidence for Ampère molecular currents

What changed

Observed mechanical rotation associated with a change in magnetization.

Scientific scope

The record is the exact two-author 1915 experiment. Its classical orbital interpretation and reported gyromagnetic ratio had known limitations; the entry does not retroactively claim the modern electron-spin account or absorb later corrections.

Evidence

The linked sources identify this contribution and its scope. WRS has not independently reconstructed the scientific claims. The record is the exact two-author 1915 experiment. Its classical orbital interpretation and reported gyromagnetic ratio had known limitations; the entry does not retroactively claim the modern electron-spin account or absorb later corrections.

Contributors

• Albert Einstein · SCIENCE: Named source author of the scoped work; individual effort shares are not measured.
• Wander Johannes de Haas · SCIENCE: Named source author of the scoped work; individual effort shares are not measured.

• Einstein and de Haas: experimental evidence for Ampère molecular currents

Provisional WRS assessment, edition 2026-10-16.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.

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