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Topic: Barometer

In the News (Wed 16 Apr 14)

  Barometer: : Login
The Travel Trade Barometer (TTB) is a qualitative survey reporting bookings and projecting bookings to the United States.
The trade-focused quarterly survey collects input from active travel trade working in-country to sell and promote travel to the United States.
The Barometer System Login to the right is the "access point" for both respondents (in-country travel trade) and subscribers (suppliers) to access a survey, and to access reports.
www.travel-barometer.com   (139 words)

  Barometer - LoveToKnow 1911
In the "cistern barometer" the tube is placed with its open end in a basin of mercury, and the atmospheric pressure is measured by the difference of the heights of the mercury in the tube and the cistern.
In the "siphon barometer" the cistern is dispensed with, the tube being bent round upon itself at its lower end; the reading is taken of the difference in the levels of the mercury in the two limbs.
The height of the barometer is the perpendicular distance between the surface of the mercury in the cistern and the upper surface of the mercurial column.
www.1911encyclopedia.org /Barometer   (3657 words)

 Barometer - MSN Encarta
A more convenient form of barometer (and one that is almost as accurate) is the aneroid, in which atmospheric pressure bends the elastic top of a partially evacuated drum, actuating a pointer.
A suitable aneroid barometer is often used as an altimeter (instrument measuring altitude), because pressure decreases rapidly with increasing altitude (about 25 mm/1 in.
The barometer is thus the basis for all meteorological prediction.
encarta.msn.com /encnet/refpages/RefArticle.aspx?refid=761573986   (385 words)

 Charles Edwin Inc. Antique Longcase Clocks and Barometers - How to Read a Barometer
On a stick barometer, the mercury should rise smartly to the top of the glass tube and hit the end with a "tick" sharp enough to be heard and possibly felt through the wood of the case.
Dial barometers may also have had the fiddly string linkage between the float in the mercury reservoir and the indicator hand come off the pulley, and this is a fault that you can correct yourself with some patience and a modicum of mechanical aptitude.
You should be aware that many stick barometers are constructed with built-in errors in the relationship between the surface of the mercury in the cistern and the placement of the scale on the case.
www.charlesedwin.com /rdbrms.htm   (1776 words)

 Weather Equipment.com - Barometers
Barometer and thermometer dials are silver, with polished brass hardware, and there is a real rosette wood inlay at the bottom.
The barometers scale is four times larger than a standard mercury barometer making it much easier to read the scale.
The water barometer, or storm glass, is of the type used since the 17th century to demonstrate variations in atmospheric pressure quickly and reliably.
www.weatherequipment.com /barometers.htm   (980 words)

 Barometer - Wikipedia, the free encyclopedia
A barometer is an instrument used to measure atmospheric pressure.
Torricelli documented that the height of the mercury in a barometer changed slightly each day and concluded that this was due to the changing pressure in the atmosphere.
The mercury barometer's design gives rise to the expression of atmospheric pressure in inches or millibars: the pressure is quoted as the level of the mercury's height in the vertical column.
en.wikipedia.org /wiki/Barometer   (866 words)

 barometer - Search Results - MSN Encarta
Barometer, instrument for measuring atmospheric pressure, that is, the force exerted on a surface of unit area by the weight of the atmosphere....
Air is held to the earth by gravity.
altimeter, barometer, calipers, clock, compass, dipstick, dividers, gauge, Geiger counter, level, meter, micrometer, mileometer, odometer,...
encarta.msn.com /encnet/refpages/search.aspx?q=barometer   (135 words)

 Barometer Summary
The mercury barometer's design gives rise to the expression of atmospheric pressure in inches or millibars: the pressure is quoted as the level of the mercury's height in the vertical column.
A barometer is commonly used for weather prediction, as high air pressure in a region indicates fair weather while low pressure indicates that storms are more likely.
Aneroid barometers have a mechanical adjustment for altitude that allows the equivalent sea level pressure to be read directly and without further adjustment if the instrument is not moved to a different altitude.
www.bookrags.com /Barometer   (1799 words)

 Mountain Barometer
Frémont siphon barometer, by Bunten, of Paris, was of the type invented by Jean André De Luc and improved by Louis Joseph Gay-Lussac.
In barometers of this type, which have no cistern, the length of the column of mercury is measured between the long and short limbs of the folded glass tube.
When the barometer is set up to take a reading, the screw in the bottom of the cistern is let down, unsealing the bottom of the tube, which allows the mercury to descend in the glass tube.
www.longcamp.com /baro.html   (1495 words)

 barometer. The Columbia Encyclopedia, Sixth Edition. 2001-05
At a given location a storm is generally anticipated when the barometer is falling rapidly; when the barometer is rising, fair weather may usually be expected.
The aneroid barometer is a metallic box so made that when the air has been partially removed from the box the surface depresses or expands with variation of air pressure on it; this motion is transmitted by a train of levers to a pointer which shows the pressure on a graduated scale.
A barograph is a self-recording aneroid barometer; an altimeter is often an aneroid barometer used to calculate altitude.
www.bartleby.com /65/ba/baromete.html   (370 words)

 Barometric Measurement
barometer, the length of its shadow, and the length of the shadow
Give the barometer to a cab driver in exchange for him taking you over to City Hall so you can look up the height of the building in their records.
Use the barometer to weigh down a piece of string and lower the string down the side of the building.
tlc.ousd.k12.ca.us /~acody/barometer.html   (604 words)

 Barometer   (Site not responding. Last check: 2007-10-24)
However, the recording aneroid barometer is a useful adjust to the physics laboratory.
This early twentieth century barometer, marked "RF", surrounded by "Brevetés SCOG (?) Paris" is missing some parts from the drive of its recording drum, but the metal bellows and the linkages to the recording arm are in working condition.
This set of four barometer tubes, purchased by Hobart in the late 1920s from Max Kohl of Chemnitz, Germany, is designed to show that the height of the mercury column is independent of the diameter of the glass tubes.
physics.kenyon.edu /EarlyApparatus/Pneumatics/Barometer/Barometer.html   (334 words)

 Mercury Barometer
The figure to the left is a diagram of a barometer; the overall length of the apparatus is a little greater than one meter.
The metal housing of the barometer and the mercury both expand as the temperature increases.
The figure of the barometer and the detail of the bottom of the apparatus are by John T. Burt, Department of Chemistry, California State University at Stanislaus, and appear at
www.upscale.utoronto.ca /GeneralInterest/Harrison/Barometer/Barometer.html   (1362 words)

 Barometer   (Site not responding. Last check: 2007-10-24)
One student replied, "You tie a long piece of string to the neck of the barometer, then lower the barometer from the roof of the skyscraper to the ground.
But if you wanted to be highly scientific about it, you could tie a short piece of string to the barometer and swing it like a pendulum, first at ground level and then on the roof of the skyscraper.
If you merely wanted to be boring and orthodox about it, of course, you could use the barometer to measure the air pressure on the roof of the skyscraper and on the ground, and convert the difference in millibars into feet to give the height of the building.
web.inter.nl.net /hcc/ACV/barometer.htm   (527 words)

 Bureau-Bureau of Meteorology - The Aneroid Barometer
A barometer is an instrument for measuring the pressure of the air, due to the weight of the column of air above it.
A barometer's main use, however, is not to measure altitude, but to measure the actual changes in the pressure of air at a particular place.
Your barometer will most likely be marked in tens of hectopascals (990, 1000, 1010 etc.) with further graduations given for each hectopascal, which enable it to be read reasonably easily to the nearest half hectopascal.
www.bom.gov.au /info/aneroid/aneroid.shtml   (1257 words)

 1-Wire Barometer
The goal of this design was to make a simple reliable 1-Wire barometer with reasonable pressure resolution and one which could be constructed without a specialized printed circuit board by a hobbyist.
My recommendation is that you do not attempt to adjust the potentiometers of your barometer until you create a spreadsheet of local airport pressure vs your readings, and do this for a significant number of readings over a range of pressures.
Following is a graph for a barometer input voltage range of: 4.17 to 3.72 volts, and a A/D value of 3.25 to 1.27.
davidbray.org /onewire/barometer.html   (2615 words)

The use of a mercury barometer to measure air pressure is demonstrated.
A series of slides shows the barometer's sliding scale as it is moves into the appropriate position.
Barometers are constructed using glass tubes filled with mercury.
jchemed.chem.wisc.edu:8000 /JCESoft/CCA/CCA6/MAIN/1ChemLabMenu/Measuring/Pressure/newbarMenu/MENU.HTM   (155 words)

 Weather Doctor's Weather People and History: The Invention of the Barometer
The barometer is one of the key instruments in the science of meteorology, and it was instrumental in answering a fundamental question of natural philosophy at the time of its invention: "Does the air have weight?".
Construction of the first barometer in the mid-17th Century is commonly attributed to Evangelista Torricelli of the Florentine Academy, although Gasparo Berti unknowingly built the first one while trying to produce a vacuum a few years earlier.
The concept of the aneroid (meaning "without liquid") barometer in which pressure changes were detected using a sealed bellows was proposed by the eminent mathematician Gottfried Wilhelm Leibniz around 1700 but never constructed.
www.islandnet.com /~see/weather/history/barometerhistory1.htm   (1089 words)

 Barometer experiments
The professional mercury column barometer is relatively immune to temperature changes since the upper chamber contains a vacuum but the upper chamber of the liquid barometer contains air and the pressure of this air is proportional to the room temperature.
The basic barometer without the heater is fine for storm watching and an interesting "storm gauge" may be constructed by placing the upper chamber in the attic or outside with no temperature controller so that the outside temperature changes the column height along with the air pressure.
Most electronic barometers use some sort of strain gauge transducer to directly convert pressure to voltage and true weather bureau performance can be difficult to achieve with these pressure sensors due to their significant sensitivity to temperature changes.
www.techlib.com /electronics/barometer.html   (3901 words)

Barometers are used to forecast the wetter, but they are not always reliable.
In a liquid barometer, mercury is used as a liquid, while its density is very high.
Metal barometers are lesser influenced by the temperature than liquid barometers are.
library.thinkquest.org /C003157/air/baromet.htm   (210 words)

 Barometer World & Museum - Home
Once decided where to position your barometer, the screw at the back of the barometer (sometimes visible through a small hole) should be turned left or right to adjust the fl indicating hand to read the correct sea level reading.
With aneroid barometers once set there should be no need to correct for altitude as you should then always be reading your barometer as if it was at sea level.
If you have a fortin barometer, which is a metal tube with a glass reservoir at the base and scale at the top it will be designed to adjust the level of the mercury in the lower reservoir to the fuducial point which is a small ivory point.
www.barometerworld.co.uk /FAQ.htm   (2572 words)

 washingtonpost.com: Weather
A barometer is used to measure atmospheric pressure.
A typical barometer employs a mercury-filled glass tube, sealed at one end with a mercury reservoir at the other end.
Another type of barometer is an aneroid barometer.
www.washingtonpost.com /wp-srv/weather/longterm/glossary/data/barometer.htm   (101 words)

 Brief History of the Barometer
In the late 1690's in Holland, a "contra" barometer was developed, using a u-shaped multiple tube to measure air-pressure and used multiple types of liquids to display the air pressure (usually mercury and colored almond oil).
These contra barometers are indeed rare, and their elaborate wood case and multiple tubes are considered by many to be the most beautiful of all.
The most collectible barometer is the angle barometer, which uses an angled glass tube, filled with mercury, which by design allows the mercury to show greater increases or decreases in pressure.
www.barometer.ws /history.html   (1775 words)

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