Compass and Barometer

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Information about Compass and Barometer

Published on May 7, 2008

Author: jabernethy


Slide 1: Compasses Barometers By: Sarah Slide 2: Compasses -They tell you the direction you’re going or the direction you need to go like on a map. -It is also called Mariner Compass. -The directions on a compass are North, South, East and West. -An early form of the compass was invented in china around 1044. -The familiar mariner's compass was invented in Europe around 1190, from whence later originated the liquid magnetic compass. -The red sundial always points North. -You can also get North-West, North-East, South-West, and South-East by combining two directions. Slide 3: Barometer -A Barometer is used to measure atmospheric pressure. - It can measure the pressure exerted by the atmosphere by using water, air, or mercury. -Some types of Barometers are water-based, Mercury, Barographs and Aneroid. -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. -The first barometer is thought to have been built unintentionally by Gasparo Berti, sometime between 1640 and 1643. Slide 4: -Evangelista Torricelli, who is generally credited with inventing the barometer, went on to build the first instrument with mercury in 1643. One more thing on Barometers! Slide 5: and now... Answer some questions to help learn even more!!! Slide 6: What does a Barometer tell you? A. Tempature C. Atmospheric Pressure B. Whether there will be a tornado Slide 7: C Slide 8: What does a Compass tell you? A. Tempature C. Wind Speed B. Direction Slide 9: B Slide 10: Thanks for watching!!!

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