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Blowing into a wide mouthed bottle with a cork and two glass tubes.

Barometer demonstration

Blowing into a wide mouthed bottle with a cork and two glass tubes.

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 Cartesian diver. At the top of the jar is a rubber bulb filled with air. The figure inside the jar is made of glass and weighs less than an equal volume of water, so it will float. This image serves to illustrate the elasticity of air and the transference of pressure in all directions of the water.

Cartesian Diver

A Cartesian diver. At the top of the jar is a rubber bulb filled with air. The figure inside the jar…