Old computer tech: delay-line memory

Not RC stuff this time but a look at some old computer memory technology in which data is stored by converting it into a series of physical torsion waves that travel around a coil of wire.

If you haven't seen the video I did on magnetic core memory on my RCModelReviews channel then here it is: http://www.youtube.com/watch?v=H98gfQJHZLU