An aneroid barometer equipped with a recording mechanism that automatically traces pressure changes on paper over time.
From 'aneroid' (without liquid pressure gauge) combined with Greek 'graphe' meaning 'to write.' This compound term describes an automatic recording barometer.
The aneroidograph was the original weather data logger—it continuously drew a line on a rolling drum of paper, creating a permanent record of pressure changes that helped meteorologists predict storms before computers existed.
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