When a turning wheel come in form of an rotation grinding stone - the convex edge changed to a hollow ede as standard becouse every farm bought a grinding wheel. (Flat edges come long time later when diamond sharpeners come = shapeners that do not chans is forms during use).
People also soon find out that also the side of the turning week could be used dor shapening - and that - if this surface was really flat - and the Guy was skilled - could give good flat edges. Stones with flat sides was more expensive - so few people had them.
For the first time tye Abressive material was in the grinding stone and they use water to get a skuret - and they stop using fat mixed with fine Quartz sand.
They also find out that a big wheel give less hollow edge - and that small wheel give a deep hollow edge.
Yes, we an learn many things from old Medivial paintings - and we also need to understand that this paintings was high tec when they was made - and that there is centuries of experiance of sharpening and knife use to get the knife knowledge to this Medivial high tec levell.
For me they tell that people for 500 years ago understod that they need support during the sharpwning process in different ways to get quality edges - and that a simple wood triangel with a movable third side could be used to get wanted exact angles, perhaps not i degrees that we use today - but from what angle they traditional and out from use know was functional for different swords, knifes and axes.
It also tells, dor 500 years ago, people understood that fat and fine Quartz sand work veey good dor shapening - and that they can use quars sand in different grits against a hard surface - and against softer wood surface to get different results. Today many thinks that diamond dust in oil are a new and modern innivation, it is, as you can se, not a new innovation. It is not a new function or method either, it is a copy of a 500 year old way of sharpening - with dust of diamond instead of dust if Quartz sand.
Today we have modern material, higher qualitys, finer grits, and so on - but we sill use old methods that sometimes are 6000 years old wen we sharpen.
People also soon find out that also the side of the turning week could be used dor shapening - and that - if this surface was really flat - and the Guy was skilled - could give good flat edges. Stones with flat sides was more expensive - so few people had them.
For the first time tye Abressive material was in the grinding stone and they use water to get a skuret - and they stop using fat mixed with fine Quartz sand.
They also find out that a big wheel give less hollow edge - and that small wheel give a deep hollow edge.
Yes, we an learn many things from old Medivial paintings - and we also need to understand that this paintings was high tec when they was made - and that there is centuries of experiance of sharpening and knife use to get the knife knowledge to this Medivial high tec levell.
For me they tell that people for 500 years ago understod that they need support during the sharpwning process in different ways to get quality edges - and that a simple wood triangel with a movable third side could be used to get wanted exact angles, perhaps not i degrees that we use today - but from what angle they traditional and out from use know was functional for different swords, knifes and axes.
It also tells, dor 500 years ago, people understood that fat and fine Quartz sand work veey good dor shapening - and that they can use quars sand in different grits against a hard surface - and against softer wood surface to get different results. Today many thinks that diamond dust in oil are a new and modern innivation, it is, as you can se, not a new innovation. It is not a new function or method either, it is a copy of a 500 year old way of sharpening - with dust of diamond instead of dust if Quartz sand.
Today we have modern material, higher qualitys, finer grits, and so on - but we sill use old methods that sometimes are 6000 years old wen we sharpen.