ارشيف مدونة اميمه ايمن

Compass, what are the compass, the benefit of the compasshttp://collaborativewriter.files.wordpress.com/2011/07/map_compass_400.jpeg
Machine indicate the direction of the land area for the magnetic north, and is the basic tool in navigation, and without facing the navigator difficulty in determining the course of the ship. And take the properties of the magnetic compass to identify trends of the magnetic earth.Date of the compass:The man knew since the time of the stone, lodestone and knew that this stone attracts a piece of iron, small to if brought him, and that the phenomenon of geomagnetic been known since a long time, and that people are not aware they have to needle the magnetic If suspended a comment is free, they tend always hand the north. It was thought until recently remained in the ground that the giant magnet lying in the direction of the north and south, as there were who thought that the Earth is a great magnet.I have used lodestone was known as "the knowledge of beatings with sand" or beatings Baloda.It is likely that the people of China are the first known magnetic properties of the stone, which indicates which one end of the needle or magnetized rod attached comment is free from the center to the north, circa 30-100 AD, but they did not use this property in maritime navigation, whether it is also true that the people of China have benefited by the mainland to travel to see their direction. It was known in China, multiple forms of magnets, each in the form of a spoon, and revolves around a plate of polished bronze. The Chinese-needle compasses suspended, or floating or based on the axis of the ninth century until the twelfth century AD.Types of the compass:There are two types of magnetic compasses: a compass with a hard drive, the compass liquid. The compass consists of a hard drive used in the vessels of a system of magnetic needles, silk thread hanging from a compass runway, which has a diameter of about 25 cm. And the magnetic axis of the needle parallel to the disc include the North and South compass. In the middle of a CD cover of the compass is based on the center tapered sharp. There are consolidation points above the center of gravity in the system so that the compass always takes the disk level horizontally. And drawn on top of the vessel that contains CD-compass direction of the line read by the direction of the ship.Affected by the magnetic compass is installed in a vessel made of steel magnetism of the ship.
Compass valuable Islamic eras:The Navigators have known Muslims since the second century AH / seventh and eighth centuries, the magnetic properties of the needle during their trade with the Chinese, and then applied the idea to see the trend during the course of the ship at sea. Arabs were making similar compasses compasses current and Benoit on her district authorities and indigenous Ksmoha to degrees.It says in the book treasure traders to know the stones to author Balq Alqubjaqa in 681 e / in 1282. Sea to Syria Rbabin they get to know the original actors in the dark nights when you do not see the needle hanging stars in an episode of acacia wood float above the water refers to the north.In the ninth century AH / fifteenth century, the use of the magnetic needle in navigation Islamic widespread.The description of Al-needle then used as a thin piece of metal in the form of untapped fish float above the water, when fish settle her mouth refers to the south. Then enter the Ibn Majid fundamental change over the house of the needle and referred to it in his interest as "the true Tgeles magnet." Installation of a magnetic needle over the age from the middle to move free movement over the disk and the wind rose.Modern compass:The newly replaced Gyro now replace the magnetic compass in ships and aircraft. Gyro and a mechanical wheel using circular and can feel the Earth's rotation. When it became possible to electrically rotate the wheel, he turned attention to the possibility of using a circular wheel for purposes of trends, as the axis of this wheel keeps a fixed direction in space. Known free-wheel ring can move around three axes Paljaroscop free. He has William Thompson of trying to design gyro in 1300 AH / 1883 AD.But thanks to the invention of the first gyro operation to Hermann Anschutz Kampfih compass were the first successful invention in 1325 AH / 1907 AD. Has produced the first gyro-American in 1329 AH / 1911. Was designed by Elmer E. Sperry, while the designed SG Brown and J. Perry's first compass English in 1335 AH / 1917 AD.Compass in Europe:Compass and then moved to Europe after the Arab who came to their ships to the East during the Crusades FrvoCompass the idea of ​​Muslims for the first time and then commonly used in Europe. The greatest discovery of navigation for them because Smehm fill the clouds and the clouds in most of the times of the year, particularly in North flung not always easy to identify those original stars in the night of these areas.In the fourteenth century borrowed the Italian weapons manufacturer named Flavio Juba idea of ​​suspending the magnetic needle on the axis of the compass pointed in the industry, which placed in the wooden box with a cover glass.


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