How the Rumsey Rotary Steam Engine Works

We made a 2D model, and  Dave Singer’s made a video of it  moving.  The pieces, yes, are plywood.  Birch plywood  stains nicely.

For simplicity, the gate springs on the model are rubber bands.  No, Rumsey did not have access to rubber bands in 1791, nor do we plan to use them!

http://www.youtube.com/watch?v=5n9JHIt_VS8