General
The Tendency barometer is invented by Alexander Adie in 1818. This instrument has some special qualities compared with a Torricelli barometer:
- it can easily be transported,
- it doesn't carry mercury
- the scale is 2,5 times larger
During the expeditions to Antartica 1902 - 1904 this instrument was used as the most important weather forecasting instrument. The Tendency barometer did keep his good functionality in difficult circumstances as the extreme law temperatures, the heavy wind and a long journey on the ocean.
Tendency barometer #A40
Weather station in a wooden case and metal background containing a gas barometer, thermometer, hygrometer and tendency pointer.
Based on the principle of Alexander Adie, a Scotsman from Edinburgh, a new type of mobile barometer was introduced in the Winter of 1818.
He developed his "portable barometer" for nautical conditions.
This kind of barometer was frequently used by seafaring nations in the period between 1820-1870.
- Total weight 1.026 g
- Height 375 mm, Width (open) 330 mm
- Brass or chromium plated scale
- Available in mahogany and dark mahogany, nut, cherry wood, light oak
- Temperature scale in Centigrade and Fahrenheit.
- Bimetal hygrometer
- Enclosed 1-year supply of registration cards
- Silicon-based oil (red fluid)
- Methyl-alcohol (blue fluid)
- Engraved metal plaque in front
- Wooden case is made of selected alder.
