Under the sunlight, it looks brilliant. On both sides of the galloping road, there stands the majestic palace high courtyard, and the Yongyu flies together, passing each other and each other, as far as the eye can see.

The city walls are surrounded by a meandering moat, rippling green waves, beautiful scenery, and high-rise buildings. The imposing roof ridge sandwiched the emperor's road, and the willow shade obscured the river that flowed through the palace.

The lawn is covered with a small grass with purple flowers, with long and narrow blades and flowers like toothbrushes. Although it is not gorgeous, it still looks full of vitality in a large area.

This is called "patina", which only grows in copper-rich soil, and is a landform plant for copper ore.

The ancient copper ore in the area of Tongguan Mountain is widely dispersed, and there are nearly 100 mining and metallurgical sites excavated from archaeology, among which the larger ones are Tongguan Mountain, Phoenix Mountain, Lion Mountain, Jinshan, Tongshan and other mining areas, each forming a mining and metallurgical center.

It can be seen that the production layout here at that time has formed a one-stop process of mining, smelting and casting, thus forming large-scale production.

Tongling is the location of the leading copper mining institution in the south of the Yangtze River, and the ancient copper smelting site is not limited to Tongling. Nanling, which is adjacent to Tongling, is also a concentration of ancient bronze smelting.

Because it is difficult to be completely uniform with naturally grown wood, there may be some places that are harder, some places are softer, and the strength may not be the same just because the shape is uniform.

By cutting one side of the wooden core, the material is trimmed to a thickness in the middle and a little thinner at both ends, and then the two ends are slightly narrowed by the two sides, slightly like a flat shoulder. The two ends are further trimmed into an octagonal shape with a planer.

In the trimming, it is necessary to achieve a smooth surface, symmetrical at both ends, and consistent thickness in order to exert force evenly. Once the shape has been cut, a flexure test is performed to check whether the elasticity of the bow's segments is uniform.

After the Yellow Emperor defeated Chiyou, he learned the smelting technology from Chiyou and sent people to Kunwu Mountain to mine. The mineral deposits of Kunwu Mountain are indeed very rich, and there are all kinds of iron and tin, but at that time, people did not distinguish between them, and only knew about smelting copper and iron.

In the late Yellow Emperor era, the use of copper and iron replaced various stone tools, and the knives, guns, spears, halberds, arrows, arrows and other weapons used by the Yellow Emperor's army in warfare were replaced by copper.

Before Pei Xuanling left, he also reminded Yi Xue that not only copper and iron are the central monopoly, but also salt.

It is managed by the central salt officials, and the salt monopoly is produced by the salt people under the supervision of the government, purchased by the government at a fixed price, and transported and sold by the government. The iron monopoly took the government. ”

The mouth of the well is only the size of a small bowl, but it is dozens of feet deep.

Use thick bamboo to make a well sleeve to cut off fresh water. Use relatively small bamboo to make buckets, go in and out of the well, fill several buckets of water in a tube, and lift them with machinery.

There are 266 kinds of mineral medicines listed in the book, and in addition to the three parts of water, fire, and earth, there are more than 160 kinds of mineral medicines contained in the gold and stone department, including appendices, which are divided into four categories: gold, jade, stone, and halogen.

In addition, there are different degrees of detailed descriptions of the origin, shape, color, mining and identification methods of each type of gold and stone.

"There are shallots on the hills, and silver below; There are shallots on the mountains, and gold below; There is ginger on the mountain, and copper tin below; There are precious treasures in the mountains, and the branches of the trees are drooping. ”

Although these records do not necessarily correspond to reality, he pointed out that the direction of prospecting for mineral use of indicator plants is correct, linking the underground deposits with the plants on the surface.

A certain mineral that appears on the mountain and another mineral that appears below the mountain are produced in different strata or rocks, and they are not the same ore body, which is only a relative relationship in location.

At the same time, a series of complex technical problems such as underground ventilation, drainage, hoisting and roadway support are preliminarily solved by various technical means.

This "round edge" is the forerunner of various types of chisel knives used for drilling in modern times, and it is indispensable in deep well drilling.

Mercury or gold ore is dominated by placer ore. In placer deposits where mercury and gold coexist, it is more accurate.

The lead-dominated lead-zinc-copper polymetallic deposits also exist with greenstone on the top and tin on the bottom, and the greenstone on the top and red copper on the bottom is also an accurate reflection of the actual situation.

The raw material should be a straight part of the middle of the trunk, with a uniform texture, and no or as few knots as possible. Cut off most of the sapwood of the log, and from the cross-section, take the middle part, half of which is the core of the wood and half of which is the sapwood.

The core is relatively soft and compression-resistant, and is placed on the inside, while the hard tensile sapwood is used on the outside. This can be judged by looking at the wood grain in the cross-section, with the relatively sparse side being the outside.

By cutting one side of the wooden core, the material is trimmed to a thickness in the middle and a little thinner at both ends, and then the two ends are slightly narrowed by the two sides, slightly like a flat shoulder. The two ends are further trimmed into an octagonal shape with a planer.

In the trimming, it is necessary to achieve a smooth surface, symmetrical at both ends, and consistent thickness in order to exert force evenly. Once the shape has been cut, a flexure test is performed to check whether the elasticity of the bow's segments is uniform.

Because it is difficult to be completely uniform with naturally grown wood, there may be some places that are harder, some places are softer, and the strength may not be the same just because the shape is uniform. Therefore, it is necessary to correct it through observation and make the hardness area slightly thinner.

"The one who bows, kneading the wood and the string is the arrow". The most important process of making a bow is to bend it.

The process of bending is called "taming the bow", which is to allow the bow back to gradually adapt to the bending. To do this, you need a special bracket.

The bracket can be made of hardwood, with a groove dug vertically at one end to support the bow, and the other end managed to be fixed vertically to the ground.

Tie the rope to both ends in the relaxed state of the bow back, put the center of the bow back on the groove of the bracket, use even force, slowly pull the string, and hang it into the first string groove, and the bow back is slightly bent.

This is to carefully check whether the curve of the arch is smooth and even, mark the areas that are too stiff, relax the bow and trim and fine-tune until you are satisfied.

All kinds of production and living utensils have also been replaced with iron and copper products. It is said that there was also a man named Jinbo, who once made a concave shape with an iron hammer and put it on the fire to roast meat, which aroused the interest of many people. Later, according to this principle, people invented the iron pot.

After the party, Lu Ji's younger brother Lu Yun, an optimistic young man who loves to laugh.

Underground, miners use boat-shaped wooden discs and other instruments to carry out gravity beneficiation to determine the grade of ore and determine the direction of mining. They were very precise in selecting the high-grade areas of the ore bodies in the fault contact zone for mining.

Generally, after the surface is opened along the outcrop of the vein, the inclined shaft is mined from top to bottom along the vein trend. The mine shaft is irregular, wide and narrow, and has a curved rat hole. The vertical depth is about eighty meters.

There is also a white hair, black or yellow tail, and there are black or yellow balls on the head or waist, which is called whipping hydrangea, and if there are two round balls, it is called whipping double hydrangea.

The pure black cat is also called the Cloud Cat or the Howling Iron. The cat's back is all black, but the belly, legs, feet, and paws are all white, which is called dark cloud cover snow. If the whole body is black, and there is a little white hair on the tip of the tail, it is called a hanging bead or a black jade hanging bead, and it is also called a black jade heavy pearl.

If the whole body is black, the tail is white, which is called the Morizo needle. The coat color is all black, but there is a white one on the mouth, which is called a butterfly.

Moreover, if it is said that there are green onions in the mountains, there is silver below, and the light is faintly white.

The white pigment may be a type of porcelain clay with flux. The glaze on the surface of Shang and Zhou glazed pottery is made of natural calcium carbonate minerals combined with clay. This lime glaze is the ancestor of celadon glaze in later generations. Celadon glaze is formulated from limestone and porcelain clay. In lime glaze, iron is the main colouring element, followed by titanium and manganese.

Copper gives the glaze an emerald green color, and iron gives the glaze a yellowish-brown and brownish-red color. Adding a small amount of cobalt-containing or manganese-containing minerals to the lead glaze will also give a variety of different shades of glaze such as blue and purple.

Since January, His Majesty has made some achievements in the scriptures and classics, but the way of governing the country and the courtesy of a gentleman still need to be used in the world, and practice is the final test.

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