= Tempest prognosticator
{wiki=Tempest_prognosticator}
The Tempest Prognosticator is an early meteorological device developed in the 19th century, specifically designed to predict storms and weather changes. It was invented by the British scientist George Merryweather in 1851. The device consists of a series of eight glass tubes filled with liquid (often mercury), each equipped with a float connected to a bell. When atmospheric pressure changes, the floats rise and fall, triggering bells to ring.
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