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A mercurial barometer: "The cup or cistern of mercury is at A. By means of the screw C the mercury is forced up until the mercury surface in A is brought to the little pointer shown at B, which is the zero or beginning of the barometer scale. The height of the mercury in the tube is then read off from the scale at C. D is an attached thermometer." -Waldo, 1896

Mercurial Barometer

A mercurial barometer: "The cup or cistern of mercury is at A. By means of the screw C the mercury is…

A barometer is a device used to measure the pressure of the atmosphere. A mercurial barometer, picture shown, uses mercury to show the atmospheric pressure, much like it did for a thermometer.

Pneumatics

A barometer is a device used to measure the pressure of the atmosphere. A mercurial barometer, picture…