Adie A069 Ship's Hull Tendency Barometer

Our latest version of the Tendency Barometer consists of two liquid filled tubes. The unique horizontal U-shaped barometer tube is open-ended and is filled with a red fluid. The closed thermometer tube is filled with blue methyl alcohol. Since both tubes are exposed to the same temperature, the only thing making the fluid levels different is the atmospheric pressure on the open-ended barometer tube.

When the fluid levels are the same, the weather is changing. When the red fluid level is to the left of blue fluid level, the weather is fair (high pressure pushes the red fluid down in the tube). When the red fluid level is to the right of the blue, stormy weather is predicted (low pressure allows the red fluid to move up the tube). Actual pressure readings in inches and millibars (hPa) can be taken and a weather forecast made by using the tendency slider parallel to and above the measuring tubes.

USA Orders Only (no international, APO and FPO orders, please). Generally leaves the warehouse in 1-2 business days.