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Old 21st Feb 2015, 22:05
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As the swinging lamp was, in fact, a chandelier (in Pisa Cathedral), he might have just 'counted' - and noticed that, regardless of amplitude, the time taken was constant.

Galileo discovered the crucial property that makes pendulums useful as timekeepers, called isochronism; the period of the pendulum is approximately independent of the amplitude or width of the swing.
From:- http://en.wikipedia.org/wiki/Pendulu...o.27s_research
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