Compass - a history of 800 years
The graphs show that a sailor would sail north to the east, for example. His problem is whether the north-east. That is placed on a magnetic compass.
So 800 years ago, sailors compass indicating the direction north. They found that when a small piece of thin magnetized iron swing freely, it is always oriented south-north direction. They called a piece of iron, a magnetic needle.
The first sailor orcompasses Sailor> have been the last straw with the imposition of a needle, a piece. The straw was then launched into a bowl with water. Later, the needle is mounted on a circular map so that it can rotate freely on the map. The card was marked from all directions. Later, the compass was in a container filled with liquid. The liquid absorbs the shock threw the boat moves through the needle steadily.
A magnetic compass watchNorth Pole of the earth. Instead of the magnetic North Pole, which is somewhere a bit 'different. However, these browsers and other conditions to the needle from the correct position to afford it.
A magnetic compass can not be used by vessels in steel. These ships have a large amount of metal that affects the direction in which the tips of the needles. In most large modern ships is another type of instrument, called a gyroscopebe used.
The gyro is really a gyroscope mounted in a special way. Like all became top heavy gyroscope rotates around an axis. An electric motor drives the rotation of the wheel of the compass. No matter how the boat moves through the axis of the gyroscope is automatically set to true north. Because we do not have a compass, gyroscope and work in a steel boat.
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