What is the first computer?

<that relay) in your logic. If you took an electronic logic circuit and <replaced the gates with relays, the result would be very slow. But if you <implemented the same logic with relays and redesigned it, the result <would be possibly useable. Logic design with realys have different implmentations as a bistable with gates can be one relay. Stepping relays are inherent counters and can be made to count to any amount. I've used realy logic for machine control, operating speed 2 to 5 sec per interation so fast was not a required thing. Doing sequential work using relays and switches is really fun. Of course all that drove air valves so there was air logic too. ;) Oh, and you can do logic with air valves, air one shots, even flipflops.