An automatic instrument that continuously records both atmospheric pressure and temperature on a single chart or graph.
From Greek 'baros' (pressure) + 'thermo' (temperature) + '-graph' (recording instrument). This instrument was developed in the 19th century when meteorologists wanted simultaneous pressure-temperature readings.
These Victorian-era instruments are beautiful examples of mechanical engineering—they use tiny pens, rotating drums, and clever mechanical linkages to track two variables at once, all without electricity, creating a visual history of the weather on paper.
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