Swan Barometer
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The "thunder glass", "spout barometer", "storm glass", and "weather glass" are regarded
as the oldes
The "thunder glass", "spout barometer", "storm glass", and "weather glass" are regarded
as the oldest barometers in the world. Hand-blown replicas of those are used
on clipper ships. They will actually forecast the weather changes up to 12 hours
in advance.