On: Lego Mechanical Computer

[munificent]

OR is easy: a rod that is fixed to stay horizontal but can slide up and down. There are rods under it at either end for the two input bits. If either input goes up, the horizontal result rod goes up.

[blharr → munificent]

That requires a gravity based mechanism to return it back down though.

[blharr → munificent]

That requires a gravity based mechanism to return it back down though.