Barometer Tube

Four glass tubes of different shapes & cross sectional areas are connected to a common horizontal tube. Mounted on a base to show level of liquid is constant.

Demonstration type, fully enclosed in a transparent synthetic case for demonstration. 100 mm coated dial reads from 28 to 32 inches and 950 to 1040 millibars, air tight sealed all around, pressure rubber bulb provided to force the movements, for educative demonstration.