Hi Tim, and others:

good photos--- isn't modern technology great when used properly!

To my trained eye it isn't hard to pick out the bite of the Muley's 2" teeth in the second example. You can even see the scratches of the teeth as the saw was moved upward to the top of the stroke

Also as you examine the marks on the second example it is the same tooth that is creating the etching in the board`s surface.

If both of these board were placed beside one another it really wouldn`t be hard to date them

The tooth etching on Muley sawn boards increase as the speed of sawing increases, putting more pressure on the direct line of cut, causing some vibration.

I would say that the rate of cut of this muley sawn board was approaching the maximum rate of 3 eights to 1 half inch per stroke.

At 90 revolution per minute the sawing rate would have been about 4 feet per minute or 3 minutes per 12 foot board.

NH