Don’t know if there is a discernable difference between the two, the stroke varied enough with the wood itself. Here’s a window on that world –

http://www.google.com/patents?id=Sy5TAAAAEBAJ&printsec=abstract&zoom#PPP1,M1

Bob might be the one to ask, he was a regular poster here (bandwith issues I think) and runs Taylor Mill. I used to take the kids down regularly ( when they were small and we lived in that part of the State ) to watch it run. Something worth the seeing !

http://www.dred.state.nh.us/divisions/forestandlands/reference/documents/TaylorMillBrochure.pdf


Here’s another worthy mill project coming together – http://www.hatchmill.org/

Keep your eye on the lower vid, some familiar faces will flicker by