The Bedford Level experiment observations were performed during the 19th and early 20th centuries.
Sources
- Bedford Level experiment (en.wikipedia.org)
- https://www.amusingplanet.com/2024/01/bedford-level-experiment-19th-century.html (amusingplanet.com)
- https://handwiki.org/wiki/Physics:Bedford_Level_experiment (handwiki.org)
- https://wiki.tfes.org/Bedford_Level_Experiment (wiki.tfes.org)
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