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A barometer is an instrument used to measure atmospheric pressure. Around the middle of the 17th century experiments by Galileo and Torricelli found that a tube of mercury with one end plugged and turned upside down, the open end of the tube immersed in a container of more mercury, remained full to the height of around 29” and that the varying atmospheric pressure would raise or lower this column of mercury. A scale could be applied to this tube of mercury, and thus it was possible to see variations in the atmospheric pressure, in inches mercury, which aided weather prediction.

Read more about Barometers and Barographs Weather Forecasting and Recording here.

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