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"Measures atmospheric pressure. Pressure from the atmosphere compresses the mercury in the tray forcing the mercury accordingly into the graduated tube." —Quackenbos 1859

Barometer

"Measures atmospheric pressure. Pressure from the atmosphere compresses the mercury in the tray forcing…

"Barometer, an instrument for measuring the pressure of the atmosphere, based on an experiment performed in 1643 by Torricelli, a pupil of Galileo." -Foster, 1921

Barometer

"Barometer, an instrument for measuring the pressure of the atmosphere, based on an experiment performed…

The aneroid barometer measures atmospheric pressure on a dial.

Aneroid Barometer

The aneroid barometer measures atmospheric pressure on a dial.

This experiment showed that every surface exposed to the atmosphere sustains a normal pressure equal to the weight of a column of mercury whose base is this surface and whose height is 30 inches.

Torricellian Experiment

This experiment showed that every surface exposed to the atmosphere sustains a normal pressure equal…