Lighthouse Tendency Barometer

Lighthouse Tendency Barometer
Click To Enlarge
  • Item #: A065


        The Lighthouse Tendency Barometer has two color images of well-known lighthouses on this model. The top lighthouse is the Portland Head Lighthouse in Portland, Maine.  It is a classic looking lighthouse while the lower lighthouse is the Montauk Point Long Island Lighthouse in New York, one of the nations oldest operating lighthouses.

The Tendency Barometer was patented on December 23, 1818 by Alexander Adie.   It consists of two liquid filled tubes.  One tube in a U-shaped which is open ended and filled with a red fluid; and one closed thermometer tube filled with a blue fluid, mounted parallel to each other.  The tubes are mounted in a mahogany-stained curved glass case.

When the fluid levels are the same, the weather is changing.

When the red fluid level is below the blue fluid level, the weather is fair (high pressure pushes the red fluid down in the tube).

When the red fluid level is above the blue, stormy weather is predicted (low pressure allows the red fluid to move up the tube).

The thermometer measures in both Celsius and Fahrenheit and the barometer measures in millibars/ hPa.  The overall instrument measures 20 inches high by 6.7 inches wide and weighs 3 pounds.  An absolutely beautiful presentation piece that will last for generations.  Made in Belgium.

Item # A065.542       

  * Marked fields are required.
Price $169.00
Availability In-Stock