The meaning of "prudence" is:
Original intention: pour wine
Curtain, sheng restaurant also. -Shuo Wen
When the body rises, sit down and have a drink. -"ritual dancer code"; There is a stoker.
The wine is clear. -The Book of Rites Danger Code; Qu Li
Think carefully and do good deeds.
"Biography of the Spring and Autumn Ram" Xi Gong (from the first year to the thirty-third year) "Who is the beggar? Please put it where it belongs. Where is it? Where is it? Cover it. "
Consider the past and reduce it. -Clear the danger code; Hong's "Zhi Ping Pian"
"Yi" means:
Roots and roots
Hey, so is Ben. -"Erya Danger Code"; Interpretation "
If you are a good person, you are born. -"everything is done by DangerCode; Jielao
Pingmugen -Hanshu Dangerous Code; Zou Yangchuan
Although it is undeniable that there was a Sina with a "magnet as a spoon to match the site" before Chong Wang, the Sina known by Chong Wang is probably a floating Sina. It is precisely because Huaxia is Sina's original invention that Sina has many improved forms, such as leaning, hanging, floating and spire. At present, it was first recorded in the first year of Xuanhe, Song Huizong (1 165438). This is similar to the statement in 1207 A. Neckam's On Instruments: When sailing, "when the sun is covered by clouds during the day or the direction is unknown at night, rub the iron needle with a magnet, and when the needle stops, it refers to the north and south." Almost at the same time as Britain, France and Italy also recorded the first compass. In addition, the floating Sina can also be used for navigation, because it is not as easy to overflow as some people think. Recently, floating Sina made of Ming dynasty porcelain was found in Qingdao and Hainan, with a size as large as: the maximum outer diameter is 9.5 cm; There are concentric circles containing water, with a hole diameter of 4.4 cm and a hole depth of 2.3 cm. The periphery is marked by blue and white glaze, and the base and walls are thick and solid. I guess it's water collection. Add water when you use it. The basic principle of modern liquid compass is similar, but the sealing technology is improved.
Discovery of magnetic declination
104 1 Yang Wei, the supervisor of the Ministry of Heaven in the first year of Li Qing in the Northern Song Dynasty, won Yingyuan Record. "The inn owner took it, and Yi Kuang's four points were correct. It's right to take the needle in the middle. " Gaiyang was born in Zi, from Zi to C; Yang was born at noon, and it turned out to be inconsistent from noon; Therefore, the king of Bingwu is in the middle of heaven and earth, and the north and south are positive.
1088/ 1095 Shen Kuo's "Meng Qian Bi Tan" Fang Jia grinds the needle with a magnet, so it can guide. However, it is often east, not all south. "
1 1 15 Kou Zongda's Materia Medica Yi Yan "Crossing the center of the lamp with a needle is also a guide, but it is often biased towards the third place."
It is too late for the west to understand the magnetic declination.
About the drought compass
Dry compass is the basic form of modern compass. It is said that it was invented by Italians, but it is difficult to find reliable information. Arabs recorded information earlier, so Arabs admitted that the compass was invented by China, but they thought it was introduced to Europe after effective improvement, so they demanded the glory of improvement. China's dry compass was earlier than the west, and there is no clear record at present. Recently, however, a small statue (marked as "Zhang") was found in a Song tomb buried in Linchuan, Jiangxi Province in A.D. 1 198, holding an object obviously similar to a geomantic compass, which is also a dry compass. The author thinks that the time of using the dry compass in China may be earlier than that in the west, but it may have been invented in the coastal areas of the south of the Yangtze River (such as Quanguang) at the earliest, so it has not been seen in Shen Kuo. The dry compasses of later inland generations are mostly used for geomantic compasses and chronograph compasses, such as 174/l 189 Zeng Sanyi's Homophony Record and Ground Snail, or meridian needles, or sewing needles between meridian needles. It takes noon in the north and south of heaven and earth. "The snail may be a compass to correct time. I have seen a small wooden box antique compass from the1900s. What meridian needle is it opened and straightened? The main purpose is to correct the time.