About this 3D model

Babbage's Difference engine. Can calculate polynomials. Animation: http://www.youtube.com/watch?v=8X6iIpjawZU Parts: Figure wheel: http://www.thingiverse.com/thing:7605 Restore arm: http://www.thingiverse.com/thing:7610 Sector wheel: http://www.thingiverse.com/thing:7711 Sector wheel tab: http://www.thingiverse.com/thing:7712 Sector wheel restore arm: http://www.thingiverse.com/thing:7713