Before the text begins, let's talk about firearms. Black powder has appeared after the Middle Tang Dynasty, it is said that the Taoist priest accidentally discovered it when he was alchemy, but the formula at that time was not reasonable, and the power was not great, it was first used in the production of firecrackers, and after the late Tang Dynasty, black powder has been rapidly developed, and it has been used in the military before the early Song Dynasty, but the power is still not large, so the Song Dynasty added arsenic, croton, pepper, etc. to the black powder, with only one purpose to increase the power of black powder.

Muskets in the real sense appeared at the end of the Yuan Dynasty and the beginning of the Ming Dynasty, otherwise how can we say that war is the driving force of science and technology? Although the previous musket has a prototype, but the structure, technology and use are restricted by the technology at that time, or military thought, even the history of the siege of Xiangyang City in the early Yuan Dynasty used Hui artillery, if the Mongols mastered the production process of artillery, will they invite the craftsmen who go back and forth from thousands of miles away?

Let's talk about the general common-sense problems encountered by the traverser, such as whether the arquebus and flintlock pistol in the Tang Dynasty can be manufactured, the answer is certain: yes! So many historical travelers dream of subverting the dynasty and killing all sides as soon as they come up, the question is is whether it is possible?

Since this book is about economics, we might as well calculate an economic account now, and we will find that even if we can make advanced muskets, we cannot overthrow a normal dynasty at all, and we are talking about a dynasty that has not gone to extinction, such as the early and middle stages of a dynasty.

In terms of price, take the Ming Dynasty as an example, when the Westerners sold to the Ming Dynasty sixty or seventy taels of guns and two thousand two hundred taels of red-clothed cannons, of course there were commercial profits, but in terms of business profits at that time, the production cost should be more than half of the selling price.

Next, it's easy to calculate, why the Ming Dynasty army has musket battalions, artillery battalions, and firearms are also equipped with the army on a large scale, but in terms of popularity, Zhu Di's Shenji battalion equipment rate is only more than one percent, in the end, the price of firearms is too expensive, and it belongs to luxury goods, consumables and fragile goods with high technology content.

Just imagine, you can know how much the primitive firearm has to be equipped to form combat effectiveness.

In ancient times, a small-scale war also had tens of thousands of people, and the decisive battle was hundreds of thousands, hundreds of thousands, and hundreds of thousands were also very common, and 10,000 people were equipped with firecrackers to calculate, and the cost price of each firecracker needed thirty taels of silver, which was roughly equivalent to more than forty in the Tang Dynasty, and an army of 10,000 people needed 400,000 yuan, as well as gunpowder, projectiles, through needles, etc., plus the cost of daily training, 600,000 guan should not be much, this is still the simplest algorithm, in fact, due to the production process, maintenance, wear and tear and other problems, The average cost is more than 800,000 yuan.

Compare it horizontally, do not use the fire gun for the Tang Army's standard iron horizontal knife, the price is about two through, at least more than 20 times the difference, the horizontal knife is not a consumable, and it will not incur much cost when training, the gap is even greater, which is one of the reasons why the Ming Dynasty fire gun was not popularized on a large scale.

In the future, when we talk about the financial situation of the Tang Dynasty, it will also involve many living standards in the Tang Dynasty. This is too underestimating the combat effectiveness of the Tang Army, if you think about it like this, wouldn't Zhu Di be invincible in the world with 10,000 firearms on the fifth Northern Expedition, and he needs to dispatch hundreds of thousands of troops every time?

The real power of firearms lies in the fact that without considering the production cost, you can form an army with the same effect as archers as quickly as possible, which is why after the large-scale use of firearms, the number of fighters on both sides has risen sharply, and hundreds of thousands or millions of battles are fought at every turn, which is also one of the reasons why the industrial revolution has created a world war. The large-scale use of firearms must rely on the large-scale production brought about by the Industrial Revolution, and it is not difficult to understand what conditions are needed for the popularization of firearms when you consider the scenes of African teenagers fighting with cheap AK47s in their hands.

···· The following text... A butterfly in the Americas flipped its wings, and the other side of the ocean would set off a monstrous wave, and countless causes and effects would make history. A blacksmith spilled his anger on the iron palm of the emperor's war horse because of a quarrel with his mother-in-law, and the emperor's war horse lost its front hooves because of the iron palm, causing the entire battle to fail. If a sheep breaks away from the flock of the Empire, the consequences may be known only to God.

Zhen Qian is this sheep that has broken away from the flock, and he is also a very low-key sheep, silently polishing the horns on his head.

The yamen is open to the south, and there is no reason to come in!

In ancient times, because there was a fight in the north, the north was respected, and the official office and yamen all paid attention to sitting in the north and facing the south. In some places, there is an unwritten rule, all dwellings, whether rich or poor, although they also sit in the north and face south, but must not be due north or south, must be slightly east or west, and only the official yamen or temples can be due south and north.

In addition to showing the dignity and majesty of the official office, the building of the "eight-character wall" of the official office has another purpose. The functions of the prefecture and county yamen include agricultural persuasion, financial management, prison litigation, education, public security, engineering and construction, and water conservancy. Some of the "holy edicts" of the emperor, the supreme ruler of the country, to persuade the peasants and educate them, the official documents issued by the yamen of the superiors that need to be informed to the people, and the notices and prohibitions issued by the county magistrates must be published on the "eight-character wall", and the "eight-character wall" has become a "bulletin board" for the yamen to issue news and regulations.

The eight-character wall is posted on the requisition order of An Lushan, the envoy of the Three Towns Festival, and the military rations raised by the states and counties must be sent to Youzhou before February next year, and those who violate the order will not be killed!

After the official communication, Zhen Qian came to the county Yahou Hall and saw the head of a county for ten thousand years. It is rumored that the famous general Feng Changqing of the Tang Dynasty also has a relationship with the Bohai Feng family, and at the same time, there are many celebrities in the history of the Feng family, such as Feng Deyi in the early Tang Dynasty.

"Juniors meet Fengming Mansion!"

In the Tang Dynasty, the county order was called the Ming Mansion, don't open your mouth to call the adult, others still think that you are recognizing your godfather?

When Zhen Qian walked into the back hall, Feng Wannian was holding a handscroll in his hand, dressed in a Yanju suit, thin and tall, with bright eyes, a wisp of long hair floating on his chest, and a leisurely expression.

Feng Wannian beckoned to Zhen Qian: "Come here, how about taking a look at this Huaisu "Fish Eating Post"?" ”

Zhen Qian walked to Feng Wannian's side, looked down at the handscroll, and muttered in his mouth: "Huaisu is a true character, the monk's name is Huaisu, the common surname is Qian, he is a good Buddha at a young age, and he is a monk." His cursive script is called "Wild Grass", with the pen round and powerful, so that the turn is like a ring, unrestrained and smooth, in one go, and another cursive master Zhang Xu is equally famous, known as "Zhang Dian Su Mad" or "Bumpy Drunk".

"Not bad!" Feng Wannian's eyes showed an approving look, "Huaisu is hard to find, today I got the "Fish Eating Post" to come to life, how about enjoying the wine together?" ”

Huaisu's calligraphy is worth tens of millions in later generations, how can Zhen Qian not know: "The Ming Mansion is intentional, how can the kid not appreciate it!" ”

Zhen Qian took the glass of water and wine handed over by Feng Wannian, and found that there was no joy on his face: "Is there something difficult in the heart of the Ming Mansion?" ”

Feng Wannian drank all the wine in the cup, sighed and said, "What does the virtuous nephew think about dedicating this volume to the emperor?" ”

Tianxia Prefecture and County have to pay tribute to the emperor every year before the first day, although Huaisu's "Fish Eating Post" is rare, but after all, it is not considered the top grade of tribute, Feng Wannian has the heart to offer, but I am afraid that Tang Xuanzong does not like it, and it is difficult to come up in my heart.

Zhen Qian suddenly had a feeling, took out a wooden box from his arms and sent it with both hands: "Ming Mansion!" The boy happened to have a glass treasure mirror from the Western Regions, and he was about to dedicate it to the Ming Mansion ......".

Feng Wannian's eyes lit up, and in the Tang Dynasty, hundreds of officials often used the dragon pattern mirror as a tribute gift, called "tribute mirror", and the emperor also rewarded the giant with a bronze mirror, called "imperial mirror". The coiled dragon pattern mirror is also called the cloud dragon mirror, and the edge is cast with the inscription of "Qianqiu", which may be the cloud dragon mirror. History of Tang Xuanzong cast "Thousand Autumn Mirror", on the fifth birthday of the first day of September, rewarded the ministers, there is a poem as evidence: "Cast a thousand autumn mirror, light life hundred alchemy." After dividing the group and giving the group, the image will see the pure heart".

Li Shimin, Taizong of the Tang Dynasty, who created the rule of Zhenguan, said: "The husband can be dressed properly with copper as a mirror; With the ancient as a mirror, we can know the rise and fall; With people as a mirror, we can see the gains and losses."

The copper mirror is cast by copper tin alloy, the Tang Dynasty increased the specific gravity of tin in the copper material, so that the color of the copper material is as white as silver, and the copper mirror made of blue light is shining, and the mirror surface is smooth and bright.

Feng Wannian found that the wooden box was very ordinary, and it was very small, only the size of a palm, and there was no even the simplest decoration, and his heart couldn't help but sink, where can such a treasure mirror be valuable?

The wooden box was slowly opened, and suddenly ...... A ray of light shoots out!

Feng Wannian was startled, the light was so bright that he almost threw the wooden box out by mistake.

After a while, the wooden box did not move at all, and ...... Feng Wannian wiped the cold sweat that did not exist on his forehead, which was too embarrassing.

"...... this?"

Curiosity drives Feng Wannian, this is really a mirror, but why can it emit such a bright light.

There are a lot of silk wool in the wooden box, and a mirror that is only the size of a baby's hand is lying quietly inside, Feng Wannian carefully took out the mirror, and a mirror as bright as the moon appeared.

The mirror is round, the frame is an ordinary wooden edge, Feng Wannian held it in his hand and found that the mirror was thin and light, if it was such a copper mirror, it would have a heavy feeling, but now it is as light as nothing.

Feng Wannian leaned himself in front of the mirror, and another Feng Wannian immediately appeared in the mirror.

Exactly the same, exactly the same!

Oh, my God! It's so clear!

Even the pores on Feng Wannian's face can be seen clearly, as if another self is standing in front of him.

Feng Wannian inhaled the cold air, and found that he was a little out of breath, and his heart was pounding, as if he was about to jump out of his throat, and he couldn't help but reach out and touch his other self.

When the finger touches the mirror, the person in the mirror also reaches out, and the fingers are simply touching together. There is no barrier at all, and it is impossible for a bronze mirror to do this.

"This is the Glass Mirror?"

Feng Wannian is not a person who has never seen the world, and the so-called glass treasure mirror has also seen a few times in Chang'an, but it is not as clear as this.

It's so clear and bright, I can't imagine it, it's so light and thin, it's not gold or jade, but it's as clear and transparent as white crystal, and the feel to the touch is so smooth, and it even feels a little soft.

"I'm afraid such a glass treasure mirror is worth a fortune, the virtuous nephew really wants to dedicate it to the emperor, but what are the requirements?"

Feng Wannian quickly sobered up, bowed to others, must have something to ask, looking at Feng Wannian in the mirror, he couldn't help but move.

Zhen Qian immediately pretended to be extremely respectful: "Today, the emperor is gracious in all directions, and the world is singing and dancing, and all the people support it." The boy is so blessed that he dares to hide this treasure privately, only the emperor can have this treasure, and it is dedicated to the emperor! ”

Feng Wannian's eyes showed joy: "Okay! It's good that you have such an idea! ”

"Someone...... Fast! Go and invite the county magistrate, the county lieutenant and the chief bookkeeper, and let them see this glass treasure mirror together! ”