Compass Ines, maria and vera

What is a compass?

A compass is an instrument used for navigation and orientation that shows direction relative to the geographic cardinal directions or points.

How does it work?

A compass points north because all magnets have two poles , a north pole and a south pole, and the north pole of one magnet is attracted to the south pole of another magnet. (We have seen this demonstrated by a pair of simple bar magnets)

The Earth also has magnets and the magnet of the compass is attracted by the magnetic field of the earth.
When was it invented? And who invented

The compass was invented more than 2000 years ago. The first compass were made of lodestone, a naturally magnetized ore of iron .

The compass was later used for navigation by the Song Dynasty .Later compasses were made of iron needles, magnetized by striking them with a lodestone.

Dry compasses began appearing around 1300 in Medieval Europe and the Islamic world.

This was replaced in the early 20th century by the liquid-filled magnetic compass.

The compass first apeared in china

Liquid compass - has a magnetized needle or card immersed in fluid.

Marine compass or a card compass - This type of compass has a needle that is fixed and a compass card that is mounted in fluid and rotates according to orientation.

Solid state compasses - are found in electric devices. They often have two or three magnetic field sensors from which microprocessor reads data about the orientation of the device. They can often be found in clocks, mobile phones and tablets.

Qibla compass - is used by Muslims to show the direction to Mecca so they would know where to turn while praying.

GPS compass - uses satellites in a geo synchronous orbit over the Earth to show exact location and direction of movement of bearer.

Astrocompass - uses positions of various astronomical bodies to find true north. It is used in polar regions where magnetic compasses and gyrocompasses are unreliable.

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