Barometers
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Barometers > Barometer Styles • Barometers at eBay
The barometer was invented by Evangelista Torricelli, a 17th century
physicist and mathematician. His colleague, Galileo, encouraged
him to use mercury, and today's barometers operate in much the same way
as the first barometer that Torricelli designed long ago in Italy.
Barometers are meteorological instruments that measure atmospheric pressure and can be used to forecast weather. Because atmospheric pressure changes with the elevation above sea level, a barometer can also function as an altimeter, to measure altitude. The two major types of barometer are the mercury barometer and the aneroid barometer.
A mercury barometer indicates pressure by the height of a mercury column that rises or falls in response to atmospheric pressure changes. An aneroid barometer indicates pressure by the expansion and contraction of a metal disc covering a box containing a partial vacuum. Some barometers, called barographs, are designed to record changes in barometric pressure over the course of time. A barograph is made up of a partially evacuated metal cylinder. This cylinder is attached to a pen arm, and the pen moves vertically when pressure changes. The pen traces a record of pressure versus time on a chart. This chart is mounted on a drum, which rotates slowly by means a clockwork.
Barometers.us features links to selected barometer and
weather instrument
suppliers. In addition to barometers, you will find thermometers
for measuring temperature, anemometers for gauging wind velocity
and force, hygrometers for determining atmospheric humidity, and
weathervanes for indicating wind direction. Some of these suppliers
also offer electronic weather stations that include several of these
instruments in one compact unit.
Shop for Barometers
- WindAndWeather.com
This online, meteorology products supplier features a good selection of classic, precision barometers. They also offer a variety of weather instruments and weather stations.
www.WindAndWeather.com - AccuWeather's AccuMall
Weather instruments, sundials, weather stations, barometers, and more.
www.AccuMall.com - Barometers Plus
This website reviews the history of barometers, explains how to use a barometer, and features online shopping for both aneroid and digital barometers.
www.BarometersPlus.com
Barometer Manufacturers
- Robert White Instruments
Offers a line of quality weather and marine instruments, including barometers, altimeters, and barographs.
www.RobertWhite.com - Davis Weather
Offers weather stations featuring state-of-the-art technology at affordable prices.
www.DavisNet.com - Columbia Weather
Manufactures and markets weather stations, weather software, and accessories.
www.ColumbiaWeather.com - RainWise
Manufactures professional meteorological equipment for consumer and industrial applications. Products include solar powered wireless weather stations, data loggers, rain gauges, and anemometers, as well as barometers, thermometers, and other weather products.
www.RainWise.com - Texas Weather Instruments
Manufactures a line of weather stations for residential and commercial use.
www.TXWX.com - Vaisala Barometers
Offers a line of barometric pressure instruments for weather stations, marine applications, and other meteorological uses.
www.Vaisala.com
