The Barton's pendulums experiment was first demonstrated by Professor Edwin Henry Barton FRS FRSE.
Notes on verification
Core claim that Edwin Henry Barton, professor at University College Nottingham, first demonstrated the pendulum experiment is corroborated by independent sources (Harvard demo page, Physics Forums citing IOP). FRS/FRSE honorifics only found in Wikipedia-derived text, not independently verified. [tier=silver indep_score=0.875 clusters=2 claim_tier=notable]