The Bedford Level experiment observations were performed during the 19th and early 20th centuries.
Notes on verification
Multiple independent sources (HandWiki, Flat Earth Wiki, Amusing Planet) corroborate the timeline, with specific documented instances from 1838 to 1904-1905 spanning both centuries. [tier=bronze indep_score=0.3 clusters=3 claim_tier=everyday]
Sources
- Bedford Level experiment (wikipedia)
- https://www.amusingplanet.com/2024/01/bedford-level-experiment-19th-century.html (corroboration)
- https://handwiki.org/wiki/Physics:Bedford_Level_experiment (corroboration)
- https://wiki.tfes.org/Bedford_Level_Experiment (corroboration)