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Reblogged by jsonstein@masto.deoan.org ("Jeff Sonstein"):
The oldest computer where I work used mercury delay lines as data storage. These worked by sending acoustic waves down a tube of mercury, the delay in the wave propagating to the sensor at the other end being the storage. This guy is doing the same thing, but by sending ping packets our over the internet, as part of his project of creating working, but wonderfully infeasible storage devices.
https://www.youtube.com/watch?v=JcJSW7Rprio