Mysteries of the Compass.
The most popular argument of the compass is that the Chinese claim to have invented it more than 2500 years before Christ.
It is also believed to have been widely used on the Asian continent in the third century of the Christian era, and then comes the theory that Marco Polo began using it in Europe.
Some historians have recently pointed out that the first version of the modern compass was practically invented by an armourer from the distant lands of Positano, Italy.
He implemented the first steps, suspending a needle over a small iron similar to the one he is currently using, and then enclosed it in a wooden box.
The anomaly of magnetism was known for a long time, since to operate it requires a thin element of magnetized iron at one of its poles to point towards the north of the earth.
In the twelfth century rudimentary instruments were already existed.
What really does not mention much is that the Arabs themselves were fascinated by this invention which they immediately incorporated into their long journeys throughout the Middle East.
We can move the compass as much as we want, lock it in a box or put it in a pocket: it will always point the North and it will help us to follow the course without making a mistake.
Of course: the magnetic needle will fulfill its mission as long as we do not place it next to a magnet.
This is so because this instrument so necessary to venture through unmarked territories is able to orient us thanks to the Earth is a great magnet.
The functioning of this hermetic box is based on a phenomenon called magnetism: the compass needle is a small magnet, attracted by a much larger one, which is none other than our own planet.
If the magnetic needle always points to the North, it is because the Earth has opposite magnetism at that pole.
Like any magnet, the compass has two poles: attraction and repulsion – if two poles have a different sign, they attract, if they have the same sign repel-, so that it is enough to relate the poles of the compass with it to guide us.
To orient yourself with a compass, it is sufficient to match the north of the outer, movable sphere of the compass with the direction pointing the needle point of the needle.