Can we make isoglosses?

[Bernd]

We'd have to look into medieval German texts on vinegar/wine production, if something like this exists. The problem is that 'kamich' is an adjective and even taking the "chasmich" variant into account it's still a stretch to reach 'ga(i)smich". I have no idea what the noun is or would have been called in the 15th century south alpine region.
There was a specific job dedicated to producing and maintaining yeasts for beer and vinegar in medieval times called Hefner.
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I have been looking for a specialist or community proficient in the medieval German/Austrian tithe system who would know about "gaismich Gens" but no success so far. I'm surprised there appears to be no amateur research community regarding medieval life in Germany.