Introduction to the ancient money identification method

The identification of ancient money first reserve knowledge identification is a comprehensive knowledge of all kinds of related disciplines. It is impossible to solve certain problems by relying on limited professional knowledge. Therefore, we require a relatively broad knowledge structure.

To identify ancient money, we must first be familiar with history, not only to be familiar with general history, but also to be familiar with the history of history and special history. This is the basis for identification.

Second, we must be familiar with and master the history of money. The occurrence and development of money has the same historical process as other historical events. It is essential to understand such a process. Otherwise, there is no way to know many important issues such as the evolution of the monetary system, currency circulation and casting.

Third, we must have knowledge of numismatics. Numismatics is a discipline that studies the occurrence, development, and different versions, textures, shapes, and castings of coins. In Chinese history, coins can be divided into many different editions according to their thickness, size, money, and ornamentation. Especially for the Song Dynasty coins, the focus of research is on the edition. Coins generally have copper, iron, lead, gold, silver, etc. Which one or several textures of coins have been cast in the dynasty, especially for identification. In addition, the craftsmanship used in the casting of coins in various historical periods in China is different. Generally speaking, Tang used the method of Fan Casting before Tang, and after Tang used the method of sanding the mother money, which is the method of casting coins in various eras. The process and technical level that come out are not the same. This requires us to understand and master the relevant knowledge before identifying the coins.

Meniscus Lens

Meniscus lens is a lens which has two spherical curved surfaces, convex on one side and concave on the other side. It is thicker at the center than at the edges. The lens provides a smaller beam diameter in order to reduce the beam waste and spherical aberration.

Positive meniscus lens is a convex-concave lens thicker at the center than at the edges. It is used to minimize spherical aberration. When used in combination with another lens, it will shorten the focal length, and increase the NA of system

Positive Meniscus Lens,Negative Meniscus Lens,Convex-concave Meniscus Lenses,Glass Meniscus Lenses

Changchun Ruiqi Optoelectronics Co.,Ltd , https://www.ruiqi-optics.com