An instrument that automatically records atmospheric pressure changes continuously over time on a moving paper chart.
From 'baro-' (pressure, Greek 'baros') + '-graph' (recording device, from Greek 'graphia' meaning writing). Invented in the 19th century for continuous weather monitoring.
The barograph was revolutionary because it meant pressure changes were recorded 24/7, even when nobody was looking—scientists could finally see what the atmosphere did at night!
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