Very nice. I got see two of these machines as well recently. The memory is indeed quite fascinating. And I totally understand and share that guy's fascination with bringing back things from the past.
For interest's sake, the EDSAC reconstruction[1] will be using taut-wire delay lines in a similar way as a replacement for the original mercury-filled tubes. We very nearly revisited the delay line "juggling" memory a while back when it seemed that magnetic bubble memory might be the solution to all of our woes. (Then flash happened.)
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[ 2.5 ms ] story [ 31.4 ms ] threadhttps://en.wikipedia.org/wiki/Curta
[1]http://www.tnmoc.org/special-projects/edsac/recreating-edsac
https://en.wikipedia.org/wiki/Delay_line_memory
It's a stack machine, like HP calculators.
I mean, if a person can make reverse polish notation sounds like the most interesting thing you have ever learned, they are worth listening to!