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 is a promotional video for the first (I think?) long-distance telephone service, in beautiful Englewood, NJ.
The system for charging users explained in here is amazing.

The “Laryngaphone” from 1929 transmitted sounds STRAIGHT FROM THE VOCAL CHORDS.
(it’s a good thing we don’t use our mouths for anything speech-related, huh?)
(via LIFE)