ScienceModernglobalmedium confidence

In its simplest construction, the Barton's pendulums experiment uses approximately 10 different pendulums hung from one common string.

Notes on verification

Wikipedia and two university lecture-demo sources confirm the general construction (a driver plus multiple driven pendulums on a common string), but exact counts vary (7-11) across sources, so 'approximately 10' is a reasonable but loose approximation. [tier=bronze indep_score=0.49 clusters=2 claim_tier=everyday]

Sources