An instrument that measures atmospheric pressure changes and can predict weather changes, similar to a barometer.
From Greek baros (weight, pressure) + -scope (an instrument for viewing or examining). This 17th-century scientific instrument was designed to help people forecast weather by observing pressure variations.
Before modern weather forecasting, people relied on baroscopes to literally watch the air's weight change—high pressure meant good weather was coming, low pressure meant storms, all without electricity.
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