Mark Kinsler refers us to the fact that overhead power lines are
prone to wind excited vibrations, and these are damped by a device
adjacent to each end of each length of cable.

One piece of useless information that has stayed with me since my
university days is that this device is called a Stockbridge Damper,
presumably named after the clever bloke who worked out that such
a small and cheap device could protect such long lengths of cable.
Brilliant!  The same principle of the damped vibration absorber is
widely used throughout mechanical engineering.

All the best from the UK,
Nicholas Simons