A visit to Heckington Windmill is always enlightening and this week I found out (from the very knowledgeable and helpful) Jim that millstones are carved according to a pattern. And that the grooves on the surface are called furrows and the flat areas are called lands. There used to be millstone pattern makers and here is an example of a pattern made in a rubber-like material. Mmm, I wonder if that would work for lino-cut printing? Only one way to find out!
The more I learn about Mills and the processes involved, the more they just keep on supplying food for thought!