Invention vs Inventor/ compass/ DC

Facts of the compass

• Older roses-of-winds didn’t have sides of the world but the names of the 
• winds. There were two systems: Classical 12-wind system and Mediterranean 8-wind system.
• Magnetic compassdoes not point to a geographic pole, but to the magnetic pole.
• During the World War II, compasses were smuggled to the prisoners of war in German camps in the form of buttons and razor blades to help prisoners escape.
• The first needle of an iron needle compass from China was in a shape of a tadpole.
• When the Chinese started using a compass for navigation instead for divination, the typical navigational compass was in the form of a magnetic needle floating in a bowl of water.
• 5 facts of de inventor 
• Fact: Magnetite minerals and water – Most of the early Chinese compasses were made of magnetite minerals that would be bolted like a lace. On this magnetic float, placed in the water, the Earth’s magnetic field would work, so it would always be in the north-south direction.
  Fact: Use of magnetite – Needle of the compass was magnetized by rubbing the magnetite, blue-brown ore that came from China and Bengal.
  Fact: Origination of name – According to the legend, the word “magnet” derives from the name of the city Magnesia in Asia, there was a magnetite ore site in ancient times. According to another legend, the word originated from the name of shepard Magnus from Crete, who had iron shoes and once stopped on a stone made of magnetic ore.
  Fact: Useful improvement in Europe – Around 1300 the maritime compass was already widely used in southern Europe, Scandinavia and Iceland. But at this time the compass got useful improvement – it is placed in a cardanic hinge (two axes connected to the ring brass, allowing it to remain permanently in the horizontal position regardless of the swing of the ship).
  Fact: Wind rose – One more important improvement is the introduction of “wind rose”, that is, round tiles with sides of the world and a circle divided into 360 degrees. The “wind rose” would rotate until its northern direction would cling to the north end of the magnetic needle. After that, it was possible to read the ship course correctly.