Mercury delay-line memory once stored computer data as pulses of sound moving through tubes of liquid mercury.

This video explores one of the strangest chapters in computer history—from wartime radar technology to early stored-program computers like EDSAC, EDVAC, and UNIVAC.

Discover how mercury delay-line memory worked, why early computers depended on it, why programmers had to carefully time instructions around circulating data, and how magnetic core memory eventually replaced it with faster and more flexible random access.

We also follow the final machines that continued using mercury memory long after the computer industry had moved on.

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