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I have rolled dissimilar balls down a ramp, timing the progression by
heartbeats, in the Galilean manner. This gave me ample opportunity
to massage the results in ignorance of variable angular momenta
of the balls.
But I knew that more precision could be obtained by identifying an
instance of a spacetime event. One plausible method would be to
shine a laser pointer on the lowest point of the pendulum's bob.
That would give me an easy opportunity to discover that holding a photo
sensor near the bob, and connecting to an oscilloscope or counter
or electronic stop watch or viewing with a videocamera
would give more reproducible results.
Brian Whatcott Altus OK Eureka!