[jcoffland]

Some really early computers stored bits in waves in mercury. A series of waves would be started at one end of a tube full of mercury and they would be read back when they arrived at the other end. The memory of course then had to be refreshed. Core memory was however much more successful.

https://en.m.wikipedia.org/wiki/Delay_line_memory

[agumonkey]

Same idea was used between satellite and ground, wave was used as a memory that could be reused when back to station.

[winrid]

Holy crap that's so cool. Thanks for that info.

[agumonkey]

Some teacher that worked for the french ministry in the 80s told us that. It makes sense but I never found data on it. I'm not 100% sure it was done because he was a bit of a big mouth but at the same time he was in the field for decades so..

[winrid]

ah yeah I haven't found anything. Still a cool idea, however I'd imagine you'd have issues with data loss.

[Avery3R]

An example of delay line memory using a wire that vibrates: https://www.youtube.com/watch?v=2BIx2x-Q2fE