A device that automatically records atmospheric pressure changes over time, usually on a rotating drum of paper with a pen or stylus.
From barometer + -graph (Greek graphein 'to write'). Invented in the 19th century as scientists wanted continuous records of pressure changes without constant manual observation.
Barometrographs created the first permanent visual records of weather patterns, and meteorologists studying these rolls of paper eventually discovered repeating cycles that helped predict future weather—it's the ancestor of modern computer weather models.
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