Handmade method of compass

The manual manufacturing method of compass is as follows:

Preparation materials:

Embroidery needle, a bowl of water, magnet, pen, paper.

Operating steps:

1, prepare the required tool materials first.

2. Cut the paper into a rectangle with scissors and rub it back and forth on the embroidery needle with a magnet several times.

3. Insert the wiped needle into the cut paper and write down the north and south on the paper with a pen.

Put the paper in a bowl filled with water, and the compass will be ready.

Introduction to compass:

Compass, called Sina in ancient times, is mainly composed of magnetic needles installed on the shaft. Under the action of natural geomagnetic field, the magnetic needle can rotate freely and keep in the tangential direction of magnetic meridian. The south pole of the magnetic needle points to the geographical south pole (magnetic north pole), and the direction can be distinguished by using this characteristic.

It is often used in navigation, geodesy, tourism and military affairs. The invention of the compass with physical direction indication has three parts, namely Sina, compass and magnetic needle, all of which belong to the invention of China. According to ancient mine records, it first appeared in the Cishan area during the Warring States Period.

Compass is the result of China ancient working people's understanding of magnet magnetism in long-term practice. As one of four great inventions of ancient china, its invention has played an inestimable role in the development of human science, technology and civilization. In ancient China, the compass was first used for rituals, etiquette, military affairs and divination, and to determine the orientation when looking at geomantic omen.

The earth is a big magnet. The poles of the earth are close to the geographical south pole and the geographical north pole respectively. When the magnets on the earth's surface can rotate freely, they will indicate the north and south because of the property that like magnets repel and opposite magnets attract-a truth that the ancients did not understand enough; But this phenomenon has been discovered by the ancients.

According to ancient mine records, it first appeared in the Cishan area during the Warring States Period. The predecessor of compass is Sina, one of the four great inventions in ancient China. In China's azimuth culture, it has gone through three stages, namely, astronomical positioning, making Sina by magnetic method, and finally evolving from Sina to compass, followed by the continuous progress of azimuth determination technology.