|
|
The Tendency Barometer was patented on December 23, 1818 by Alexander Adie. It was used by Ross on his expeditions. He is quoted in his diary as saying " the advantage of the tendency barometer to a mercury barometer is as big as having a mercury barometer to having no barometer at all." It consists of two liquid filled, mercury free 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. 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. Item # A054.542 Suggested Retail Price = $279.00 *Customizing Available on this product Click these links to see other models of the Tendency Barometer. A38 - Simulated burl wood frame A46 - Nautical look with walnut frame A049 - Modern style w/glass front |
Send mail to info(remove to
send)@allivanmktg.com with questions or
comments about this web site.
|
The
Ross Tendency Barometer is mounted in an exquisitely crafted wood and curved glass
case. A tribute to the famous Artic and Antarctic explorer James Clark
Ross (1800 -1862) discoverer of the magnetic North Pole. His
ship, the Erebus, is pictured at the top of the instrument and a map of the Antarctic is
pictured below.