What?
- 1.An instrument containing a magnetized pointer which shows the direction of magnetic north and bearings from it.
- 2.An instrument for drawing circles and arcs and measuring distances between points, consisting of two arms linked by a movable joint, one arm ending in a point and the other usually carrying a pencil or pen.
Why?
The magnetic compass was an important advance in navigation because it allowed mariners to determine their direction even if clouds obscured their usual astronomical cues such as the North Star. It uses a magnetic needle that can turn freely so that it always points to the north pole of the Earth's magnetic field
Who?
Magnetic field of the Earth and point Magnetic North-South. The First compass was invented in China during the Han Dynasty between the 2nd century BC and 1st century AD
Where?
In China by the military for navigational orienteering by 1040–44, and was used for maritime navigation by 1111 to 1117.
How?
To use a compass like this, you first figure out which direction is north. You let the needle settle then rotate the compass card so the needle lines up with the north-south axis and the end of the needle colored red, marked with an arrow, or printed 'N' points north.
When?
The magnetic compass was not, at first, used for navigation, but for geomancy and fortune-telling by the Chinese.
Pictures
Sources:
https://en.m.wikipedia.org/wiki/History_of_the_compass
Pictures google
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