Holosteric Barometer
My wife gave this beautiful late 19th Century Ships Barometer to me as an early birthday present. (My birthday is in October!)
It was made in France for the Dutch Market.
I'm a bit puzzled by the scale going from 71 to 81. Does anybody know about this kind of measurement?
I am only familiar with inches and millibar scales.
Update: Vatorman solved this one, the scale in cm.
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