Cormorants, fishermen often animals of water birds, and their main users, fishing is also.
According to the Watcher's "Tiangong Kaiwu", the ancients made good use of the nature of cormorants for fishing. Cormorants are good at swimming, and their eyes can observe the traces of fish underwater. Fishermen raise them, and every time they come into the abyss, the cormorant will enter the water enthusiastically, like a arrow. Its beak is as sharp as a hook, and when it sees a fish, it will peck and catch it. Although in deep water, it is difficult for the fish to escape.
Fishermen also have skills when they are envoyed by cormorants. First tie their necks with grass, so that they can swallow fish and cannot go down. When they catch fish, the fisherman will lead them back to the boat and take the fish from their beaks. Cormorants offer fish, fishermen or give food as a reward, so that they know that if they catch fish, they will have food, and they will be more eager to catch it next time.
Such fishing methods were quite common in the water towns of the past. Cormorant fishing is more convenient than people operating their own nets. First, cormorants can penetrate deep into the water and reach places that are difficult for people, so they often catch more fish. Second, cormorants are agile and can quickly hunt down swimming fish, which is quite efficient.
Therefore, cormorants have made great contributions to fishing. They are the right-hand assistant of fishermen in fishing, helping fishermen catch fish for survival, and have made indelible contributions to the prosperity of fishing in water towns.

Mercury, known as mercury in ancient times, is the only metal that is liquid at room temperature. It has unique physical properties, which can be seen in ancient records and the insights of the sages.
The color of mercury is silver-white, radiant like moonlight. When it flows, it is like a smart silver snake, slippery without leaving its hands, shining brightly. Looking at its form, although it is a liquid, the surface tension is quite large, and it often gathers into beads, round and full, rolling freely on the surface of the object, just like a smart jade bead, without touching other things.
Furthermore, the density of mercury is very high, far exceeding that of ordinary liquids. Compared with ordinary things, the weight of mercury is several times that of water in the same amount of water and mercury. This property makes mercury unique in many practices. For example, the ancients used mercury as a tradeoff for precise measurement, and its stability and accuracy were highly valued.
The volatility of mercury cannot be ignored. Although it evaporates quietly at room temperature, this property cannot be underestimated. Mercury is placed in a closed space for a long time, and its volatilization gas gradually accumulates, which can cause air poisoning. The ancients gradually knew the harm of mercury gas in alchemy and other techniques. For example, Ge Hong's "Baopuzi" may have related insights, warning everyone to use it with caution.
The melting point of mercury is extremely low, about -38.87 ° C, so it is a flowing liquid at room temperature. The boiling point is not very high, about 356.6 ° C. This unique melting point makes it sensitive to morphological changes when the temperature changes. In the ancient attempts to observe heat and determine temperature, mercury may have been an important medium to help it perceive temperature changes.
Mercury in metals also has its own characteristics of electrical and thermal conductivity. Although its electrical conductivity is not as good as that of copper and silver, its electrical conductivity is also useful in specific situations. And its thermal conductivity is relatively stable, which may have unique value in the research and practice of heat transfer.

The boron chemical is also the thing that is transformed. Whether its properties are determined or not cannot be generalized, and it depends on the general situation.
Boron chemical is original, which is one of its important characteristics. Under normal and dry conditions, boron chemical can be stored for a long time without being produced. However, when it encounters water, boron chemical water can be strongly reversed, and the speed of its reaction is as follows. If a fire starts, the reaction is roughly as follows: $NaBH_ {4} + 2H_ {2} O = NaBO_ {2} + 4H_ {2}\ uparrow $. This reaction is rapid, so in the tidal environment or in contact with water, boron chemical can maintain its quality.
Furthermore, the quality of boron oxidation is also affected by the degree of influence. When the degree of resistance increases, its reaction activity is low, and its characterization is weak. In high temperature, boron oxidation may decompose on its own, resulting in its modification.
In addition, if boron oxidation encounters oxidation, the two will also produce intense reaction, and ghost will affect its characterization. Due to the original nature of boron oxidation, it is easy to oxidize and initialize, resulting in its own change.
, the degree of boron oxidation is determined, depending on the environment, the level of boron oxidation, and the surrounding oxidation. In order to keep it stable, it must be placed in the dryness, low temperature and low oxidation, so as to ensure its stability and meet the needs of general efficiency and industrial use.

If you want to make a glazed tiger tool, there are many methods, and the ancient craftsmen each applied their own tricks. The following is a brief description.
One is to choose good materials. If you want to get a good product of glazed glass, you should look for pure quartz sand. The purity of the quality is that the color of the glazed glass is transparent and translucent. It also needs to be supplemented by lead pill, saltpeter, etc. Lead pill can increase the luster and plasticity of the glazed glass, and saltpeter can help it melt evenly. The proportion of various materials needs to be precise, such as quartz sand accounts for about 70%, and lead pill and saltpeter account for 30%, which can be fine-tuned according to different color and texture requirements.
Second, the method of melting and casting. Put the materials in a crucible and calcine them with a fierce fire. Ancient kilns used firewood charcoal as fuel, and heat control was At first, it is slowly baked with a warm fire, so that the materials are preheated and blended, and then the fire is gradually increased to a high temperature of more than a thousand degrees, so that it is completely melted. At this time, the glazed liquid is like flowing gold, and the craftsman needs to be quick and quick to pick the glazed liquid with a special long pole and quickly place it in the mold. The mold is either made of pottery or metal, and it is made according to the exquisite shape of the tiger.
Third, shaping and modifying. After the glazed liquid is put into the mold, while it is not solidified, the craftsman carefully shapes it with tools. Or engrave its markings, or shape its expression, so that the tiger's might and agility come to life. Wait for it to condense a little, take out the mold, and pour it lightly with cold water to separate the glazed glass from the mold. If there are any defects, you can use a small fire to bake it slightly and carve
Fourth, annealing treatment. After the glaze is shaped, it should not be suddenly cooled, but should be placed in an annealing kiln to slowly cool down. This process takes several days to release the internal stress of the glaze evenly to prevent it from bursting. After annealing, the glazed tiger tool is completed. Its color is gorgeous, its quality is strong and beautiful, and it can be treasured.
The ancient glazed tiger tool was made by craftsmen. Every step is about success or failure. Its exquisite skills are sincerely admired by future generations.

Mercury, a highly toxic substance, should be stored and transported with caution.
When storing, choose the first heavy container. It must be stored in a strong and airtight container to prevent mercury leakage. Commonly used utensils are mostly thick glass or metal bottles, and the cap of the bottle must be tightly sealed. If the glass is used as a container, it must be checked for cracks. The density of the mercury cap is quite high, and if there is a slight gap, it is easy to leak. Furthermore, the storage place should be a cool, dry and ventilated place to avoid open fires and hot topics. Mercury is volatile when heated, and its vapor is highly toxic, which is very harmful to human health. In addition, mercury should not be stored with strong oxidants, acids and other substances to prevent chemical reactions from occurring and causing dangerous growth.
When transporting, properly encapsulate the mercury in a special container and wrap it in a thick protective material, such as foam, sponge, etc., to cushion the vibration and prevent it from being damaged. The transportation vehicle also needs to drive smoothly to avoid bumps and sudden brakes. Escorts should be familiar with the characteristics of mercury and emergency treatment methods. If there is a mercury leak on the way, do not panic. Quickly evacuate the surrounding crowd, set up warning signs, and strictly prohibit fire from approaching. Disposers must wear professional protective equipment, such as gas masks, protective gloves, etc. Sulfur powder can be sprinkled on the leakage. Mercury and sulfur can be synthesized into mercury sulfide, and its toxicity is greatly reduced, and then cleaned up.
In short, the storage and transportation of mercury is related to the safety of everyone, and everything must be done in accordance with the norms, and there must be no slack in order to ensure safety.