Binary Adder

[RubiksMaster]

This guy made a 6 bit binary adder out of wood and marbles. He uses mechanical rockers much like JK flip-flops are used in binary counters.

It's really cool!

Here is a video of the adder in action.
http://www.youtube.com/watch?v=GcDshWmhF4A

 

[Kunax]

http://acarol.woz.org/

 

[leopold]

http://www.meccano.us/difference_engines/rde_1/index.html
there are also links to download videos of the machine in operation.

 

[RubiksMaster]

Wow!