Vibrations and how they get to your ears.
Noise for airports is a blog about culture, sound, music, and technology.
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Updated (sometimes) by Nick Seaver.

This wire recorder toy looks pretty neat. It is effectively a tape head with a microphone stuck to it, so by sliding it along a ferrous material while recording, you can create a variable magnetic field. Then, just run it back over the field in “play” mode at exactly the right speed, and you’ve got the basics of magnetic recording!
(via technabob)