See also acoustic delay lines. Basically the same but instead of using phosphorous, they use mercury, or piano-wire, but never gin. Gin was proposed by some fan

See also acoustic delay lines. Basically the same but instead of using phosphorous, they use mercury, or piano-wire, but never gin. Gin was proposed by some fanciful idiot [1] but never used. [1] https://en.wikipedia.org/wiki/Delay-line_memory#cite_ref-3 https://en.wikipedia.org/wiki/Delay-line_memory#cite_ref-3