Can compass be geomantic?
It is also an important contribution of China to the development of world civilization. Compass is a pointing instrument made of the north and south polarities of magnets in the earth's magnetic field. The picture on the left shows the hook pointer repair model. This characteristic of magnets
The ancients used it to make guiding tools. The earliest tour guide was called Sina.
It has been widely used in China. It is made of natural magnets.
Looks like a spoon.
The center of gravity is in the center of the bottom.
Smooth chassis
Carve 24 directions around it.
When in use, put the spoon on the chassis.
Tap with your hand
Make it turn
When it stops, the long handle points south. Wang Chong in the Eastern Han Dynasty (on balance? Its shape and usage are recorded. (Guiguzi? ), it is also said that Zheng people went to distant places to collect jade.
I brought Sina.
In case you get lost. in addition
The invention of the compass also raised this instrument to a higher level. The picture on the right shows the south guide car model.
The following pictures are the imaginary picture and Sina model of the guide fish respectively. but
Sina, this is made of natural magnets.
Low finished product
The magnetism is very weak. In the song dynasty
People invented artificial magnetization.
Made a guide fish and a compass.
The compass is simpler.
More practical value. It is made of natural magnet rubbing steel needle.
Maintain guidance performance under geomagnetic action; Install it on the orientation board later.
This is called a compass. This is a great leap in the history of compass development. The picture on the left shows the navigation compass used in Qing Dynasty. Including the positioning method of compass, has also been studied in detail.
Four different methods are summarized.
And made a comparison: 1.
Water flotation. Floating compass to indicate direction.
As for the specific methods
Shen Kuo didn't explain. By the late Northern Song Dynasty,
Pharmacologist kou zongxuan's (materia medica? A magnetic stripe) is introduced.
It turns out that I put rushes on the compass.
You can float the needle. The disadvantage of water flotation is that the magnetic needle will swing with the water. two
Nail rotation. Put a magnetic needle on your fingernail.
Can operate flexibly.
But the disadvantage is that it is easy to slide. three
Bowl lip rotation method. Put the magnetic needle on the edge of the bowl.
You can also rotate freely.
But it is also easy to fall. four
Hanging wire method. Take a new cotton thread.
Stick a little wax in the center of the magnetic needle.
Suspended in a windless place, the magnetic needle can indicate the direction. by contrast
Shen Kuo thinks this method is the most ideal. The picture on the right shows four experimental restoration designs of Shen Kuo compass. Compass is a common directional tool in 1 1 century. Compass maximum page
It has greatly promoted the development of navigation. According to textual research
At the end of 1 1.
Compasses began to be used for navigation. About the end of the twelfth century to the beginning of the thirteenth century.
The compass was introduced by sea.
Then it was introduced into Europe.
Reference:. geocities/kingphmk/nor
In fact, the first layer of the compass is already a compass. In the Han Dynasty, people already knew how to use the "Sina" compass to judge the position. If you don't buy a compass in the southeast, northwest and northwest, you just need to pay attention to one direction at the edge of the solar system.
One edge is the east.
The sun sets.
Other directions (four right angles and four corners) can naturally be cut out.