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1) "Barometers" -- As to barometers ba·rom·e·ter
Pronunciation: b&-'rä-m&-t&r
Function: noun
1 : an instrument for determining the pressure of the atmosphere and hence for assisting in forecasting weather and for determining altitude
2 : something that indicates fluctuations (as in public opinion) <housing sales and other economic barometers>
3 : STANDARD, TEST <a barometer to measure high school talent -- Jeff Fellenzer>
- baro·met·ric /"ber-&-'me-trik, "ba-r&-/ adjective
- baro·met·ri·cal·ly /-tri-k(&-)lE/ adverb
- ba·rom·e·try /b&-'rä-m&-trE/ noun Pronunciation Symbols
| Schematic drawing of a simple mercury barometer with vertical mercury column and reservoir at base | | Table of Pneumaticks, 1728 Cyclopaedia | A barometer is an instrument used to measure atmospheric pressure. - 1 Liquid barometers
- 1.1 Water-based barometers
- 1.2 Mercury barometers
- 2 Aneroid barometers
- 3 Applications
- 4 Compensations
- 4.1 Temperature
- 4.2 Altitude
- 5 See also
- 6 References
| This concept of "decreasing pressure means bad weather" is the basis for a primitive weather prediction device called a weather glass or thunder glass. It can also be called a "storm glass" or a "Goethe thermometer" (the writer Goethe popularized it in Germany). It consists of a glass container with a sealed body, half filled with water. A narrow spout connects to the body below the water level and rises above the water level, where it is open to the atmosphere. When the air pressure is higher than it was at the time the body was sealed, the water level in the spout will rise above the water level in the body; when the air pressure is lower than it was at the time the body was sealed, the water level in the spout will drop below the water level in the body. The "Thunder Glass" also acts as a thermometer: increases in temperature will raise the water level in the spout. A standard mercury barometer has a glass column of about 30 inches (about 76 cm) in height, closed at one end, with an open mercury-filled reservoir at the base. Mercury in the tube adjusts until the weight of the mercury column balances the atmospheric force exerted on the reservoir. High atmospheric pressure..."
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