I was just thinking this must be how IBM started out, didn't they (or someone else) build big relay computing machines?

By the way, it's still common to see large banks of relays in the field of train coltrol - not exactly the same as a relay computer but I've wondered why they haven't gone over to PLC's long ago.

Radar

There are 10 types of people. Those who know binary, and those who don't.