Speaking of nails people are very familiar with, because it will be seen in our daily life, the scope of application is very wide, nail can be said to be a relatively long history of the industry, this article to introduce the development history of nails
Nails should be one of the great inventions of mankind. On the simple structure for human to solve a lot of complex problems. According to archaeologists found that as early as 3000 years ago, the Mesopotamia of the Mesopotamia began to use nails, but those nails are made of clay.
According to the nail only, the ancient Chinese language "nail" is "Ding", is currently known or identified one of the earliest Chinese characters, about in Oracle has this word. According to the philologist's explanation, D is the pictographic character, which is consistent with the basic explanation of D or nail. Ding, pictographic characters, gold like the shape of the head of the nail, Xiaozhuan like side of the nail type, refers to nails, as the "nail" of the ancient word.
Nails, nails, nails, usually spikes, spikes of wood, metal or other material with pointed or pointed ends. Also known as "thin sticks made of bamboo, wood, metal, etc .. One end has a flat head, the other end sharp, mainly from fixed or connected role, can also be used to hang items.
Analysis inferred that the use of nails is associated with the use of needles. Many of the tools used by early humans were natural. The sharpness of the plant's bones or of the bones of the animals after their breakage is likely to be a source of inspiration for further human-made tools, and the early tools of archaeological discovery, from the Stone Age to the Bone, Wood Are such a trajectory.
Nails and needles, of course, have the same sharpness and sharpness as they have piercing or bonding functions, but the difference is that the needle is more likely to be stitched - the needle also has more nails Is fixed by force imposed on the surface, or hard to fix themselves, or through their own hard to other objects to fixed, support, bonding.
A closer look, you will find the nail itself is a set of "contradictions." Hard head is all-conquering "spear", flat head is more like to protect their "shield" card. Because of this shield, when it attacks others, they are well protected. In general, the nail is to be nailed to the surface of other objects, but that his head is generally exposed to the outside, we can say, by stabbing others and their own well to prove their own existence. Both to tie into, but also exposed, this is the nail.