Kermit, I saw an illustration once of a water power, up and down saw mill where the log was set into the saw at an angle so that gravity fed the log into the saw. This kind of mill would show angled saw marks I would suppose. I have never tried pit sawing but I suppose it would be difficult for the top man to pull up perfectly vertically, just like sawing with a hand saw, I would imagine the saw would angle into the cut?