Most complicated thingy

[Mik1w]

what about like a modern snier rifle? I would imagine a lot goes into that to make it accurate. There is gunpowder as well, I suppose that might not count.

I saw something at a museum in London, but I can't remember what it did. It was a huge mechanical device, I think it was a mechanical abacus, but it was absolutely massive and looked incredibly detailed and complex. It was about three times my height, and in a very large box. I think it was an early "computer", but it was entirely mechanical so I'm not sure.