An automatic recording instrument that continuously measures and graphs atmospheric pressure, temperature, and humidity simultaneously.
From Greek 'baros' (pressure) + 'thermo' (temperature) + 'hygro' (humidity) + '-graph' (recording device). This technical instrument emerged in the 20th century as meteorological science advanced.
These complex instruments are the grandfathers of modern weather stations—imagine coordinating three separate mechanical sensors to write three different lines on the same rotating drum without interfering with each other; it's an engineering marvel that kept meteorologists supplied with vital data long before computers.
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