If a drop of pitch drops in a bell jar and nobody is there to see it
(and the webcam misses it too), does it make a sound?
Located in Australia, 8 drops of pitch have fallen from this
apparently solid lump since 1930 - the last in 2000. Webcam monitored
nowadays but Murphy intervened to ensure that nobody has ever seen a
drop fall.

                  http://en.wikipedia.org/wiki/Pitch_drop_experiment
                  http://www.physics.uq.edu.au/physics_museum/pitchdrop.sht=
ml

http://upload.wikimedia.org/wikipedia/commons/6/62/University_of_Queensland=
_Pitch_drop_experiment-6-2.jpg
                       http://www.physics.uq.edu.au/physics_museum/pitch2.g=
if

This clock has run on "atmospheric power (in New Zealand) since 1864,
but has stopped or been stopped very occasionally

                http://en.wikipedia.org/wiki/Beverly_Clock

This electric bell has operated "almost continuously" since 1840.
This could be easily replicated with a modern lithium primary cell for
a life of 10+ years. Their battery is obviously made of sterner stuff
- but nobody knows what.

                http://en.wikipedia.org/wiki/Oxford_Electric_Bell


     Russell McMahon



Ref: David Daniel
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