The scale of the Tiangongfang has been far better than before, covering an area of 1,200 acres of land, the steelmaking furnace has also played 36, and the rest of the armor workshop, the arsenal workshop, the agricultural tool workshop, the water workshop and other subdivided workshops have more than 10 workshops, hundreds of craftsmen in each workshop, and with the blowout of production capacity, the return on income is comparable to opening a gold mine.

Walk through the dense workshops and the living quarters with superior conditions, and come to the shade behind the mountain along the river that Wanhuan turns, there is a very hidden canyon here, the entrance only allows three or five people to walk side by side, an iron fence is erected, there are arrow towers built on both sides, every day from morning to night, twelve hours are heavily guarded, and it is difficult for birds to cross.

After checking the password of the day, and showing the bronze plaque that could not be imitated, the team leader on duty snapped to Xu You and Zu Xiao and saluted, and then let them in.

This is the secret R&D base of Tiangongfang, surrounded by mountains on three sides, only the entrance of the canyon, there is no name to the outside world, and the internal R&D personnel jokingly call it "Phoenix Valley", taking its meaning of Phoenix Nirvana, hoping that every test can survive and find life.

The defense in the valley is more strict, three steps and a post, five steps and a sentry, and then go seven or eight miles, the front of Huo Ran is open, the surrounding wall stands thousands of thousands, the majestic and precipitous, in the middle is an irregularly shaped turquoise small lake, by the dark river in the belly of the mountain to flow and impact the formation. Around the lake, there are rows of houses, but what attracted Xu You's idea was the two-story cement brick house that had just been built, from the outside, it was closer to the collective dormitory in the factory in later generations, all of which were mainly practical, without the slightest aesthetic consideration, and those rows of houses were not an aesthetic product at all.

Xu You said in surprise: "This ...... When did you get cement and red bricks? ”

In ancient times, the eastern green bricks were poorly efficient, costly, and low-yielding, in stark contrast to the red bricks used in the west.

Oriental buildings are mainly wooden structures, because wood is easier to create large building spaces, while masonry is a pressure material, due to the lack of understanding of stone mechanics, can only be used to pile up tombs, pave roads, build walls and other basic buildings, but can not become the main body of the building.

Therefore, the limited demand has created a small brick kiln with fine workmanship, coupled with the process design that requires capping and watering, so that the cost of green bricks has soared and the efficiency has plummeted.

The ancient Romans solved this century problem by crossing three horizontal cylinders and one longitudinal cylinder, and the hall technique called "Basilica" was used to create large-scale masonry buildings, so the demand for bricks could not be met by non-large brick kilns.

At that time, the cost of the large brick kiln dome was extremely expensive, so it could only retreat to the second best thing and open the kiln roof, and the result was sufficient oxygen combustion, and the red bricks burned out had good durability, rich colors, large output, low cost, and quickly occupied the market.

Xu You once discussed with Zu Yu that firing red bricks to reduce costs and increase production would allow even if brick and stone buildings could not be replaced with wooden buildings for the time being, they could also be used in the military in the future, and then slowly promoted.

But when it comes to military use, the role of red bricks is not the most important, the most important thing is to invent cement!

The cement is in the red bricks, and in this era when the fortress is needed for key defense, it is simply too rough and shameless!

The cement manufacturing process is not difficult, there is already a very mature lime firing process and lime gel material in ancient times, the Great Wall of the Qin and Han dynasties is mostly built with limestone fired by this technology, to the Northern and Southern Dynasties, lime, glutinous rice and sand and other three-in-one soil glutinous rice mortar has become popular, but it is still that sentence, the cost is too large, the time is too long, and the technology that can not be used on a large scale is equivalent to nothing.

As a result, the invention of cement was put on the agenda of the Heavenly Workshop.

Xu You knows the approximate cement manufacturing method, limestone, clay grinding into a surface, and then adding granulated blast furnace slag as an active mixed material, according to a certain proportion, it can be successful.

There is a lot of limestone, there is no shortage of clay, and there is everything in the blast furnace slag, but this certain proportion, Xu You does not know, and Zu Yu needs to take people to conduct difficult experiments, find the best value, and then form a fixed method.

In the end, it was Hu Hongzi who solved the problem of proportions!

"About half a month ago...... Come, come, this way, cement and red bricks are nothing compared to that black thing......"

Zu You's excitement was completely different from Xu You's, and he dragged him directly to the innermost and most heavily defended secret equipment workshop.

To put it bluntly, only things that are ahead of their time are developed here!

"General, this is the black thing you mentioned, it's really powerful, and the moment of deflagration can reach blue and white......"

Since the pre-Qin period, the measurement of temperature has been classified by the color of fire: where it is cast gold, gold and tin, black and turbid are exhausted, and yellow and white are secondary; Yellow and white are exhausted, followed by blue and white; The green and white qi is exhausted, and the green qi is secondary.

Qingqi is 1200 degrees, and Qingbai is about 1000 degrees, that is to say, the instantaneous temperature of black gadgets can almost be similar to the temperature difference that can only be achieved by burning day and night in a furnace.

Xu You didn't have the excitement that Zu Xiao imagined, as long as he knew the proportion, he could make it with sulfur, saltpeter, and charcoal after intensive experiments.

In order to increase the success rate, he also specially invited Hu Hongzi, a famous Dandao master, to assist. Hu Hongzhi is the author of "Fu Xuan Zhen Jin Jue", which is one of the few people in this era who can be compared with the Danyang Ge clan, who is the best at alchemy, in his personal name.

It was extremely difficult for others to invite him out of the mountain, but Xu You was very easy, and directly wrote him a few junior high school chemical equations, verified several typical chemical experiments, and explained the representative meaning of chemical symbols and the internal logical relationship of chemical reactions.

So, Hu Hongzi rushed to the Tiangongfang by boat overnight, eager to write to Xu You every day to ask for chemical knowledge. Xu You was entangled in military affairs and had no time to teach, so he threw him to Zu Hu, and agreed to complete the task first, and on the day of completion, he would give him fifty chemical equations.

Hu Hongzhi really worked hard, forgot to sleep and eat, took the workshop as his home, gave full play to the spirit of ownership, studied black gadgets, and easily solved the ratio of cement!

The result was perfect, and I was shocked, no one would have thought that the black thing in Xu You's mouth would have such a huge power, but looking at Xu You's expression now, it seems that there is still a little unfinished?

Hu Hongzhi was afraid that he would change his hexagram, his eyes widened, and he said angrily: "General, this is made according to your method, whether you are satisfied or not, the promised formula must be given to me!" ”

Xu You smiled: "You can not only create a black gadget in just one year, but also complete the granulation of it, which is a credit beyond the agreement, so I decided to give you a hundred equations, how about it?" ”

From powder to granular, it can perfectly solve the shortcomings of inconvenient transportation, uneven combustion rate, and easy moisture, and can make the combustion rate more uniform, more efficient, and the power has been increased by nearly three times.

What boss doesn't like an employee who can draw inferences?

Hu Hongzhi jumped up excitedly on the spot and said, "The gentleman has no jokes? ”

"Get a pen and paper!"

Through the defensive stacks made of cement, red bricks and iron, Zu Yu demonstrated the blasting of the black fire for Xu You, buried it in the masonry pit with five kilograms of compression, ignited the fuse, and exploded quickly.

The sound was like thunder, the bricks and stones were splashing, and everyone behind the defensive battlements was all happy, even if they had tried it many times before, they could not help but be honored to see such a thing that seemed to be in mythology through their own hands.

Xu You smashed his mouth and said, "It's okay...... Hey, it's still a little bit less powerful. "Compared to the yellow fire, the black fire is indeed a little less interesting.

Zu Yu knew Xu You's details very well, and he was not very surprised by these words, who knows how many things this general still hasn't taken out?

Hu Hongzhi didn't give face so much, and said: "General, this thing is like an artifact conjured up by Qiankun, if you still think it's not good, why don't you summon Lei Gong out and blast the sky into a hole?" ”

Xu You had already written the explosion equation of the black fire to him just now, and he smiled when he heard the words, and wrote him a reaction equation for the bitter taste (this is also forbidden), the originator of the yellow fried in the later generations.

Hu Hongzhi frowned and looked at it for a long time, pointed to one of the symbols, and asked, "What is this?" ”

"Bitterness"! ”

Hu Hongzhi's face was full of confusion.

Bitter taste, which needs to be formed by mixing concentrated nitric acid, concentrated sulfuric acid and phenol. For Xu You, nitric acid is easy to get, and the saltpeter used to make black fire is refined potassium nitrate, and then the potassium nitrate is calcined to produce nitrogen dioxide, and then mixed into water to become nitric acid.

Sulfuric acid is also easy to get, green alum is a necessary item for alchemists, and sulfuric acid can be obtained by calcining melt water, also known as green alum oil, and it is estimated that there are ready-made ones in Hu Hongzhi's bag.

But concentrated nitric acid and concentrated sulfuric acid are not so easy to get.

To make concentrated nitric acid, you must first have concentrated sulfuric acid, and then use concentrated sulfuric acid and dilute nitric acid to heat and purify, and you can get 90% concentrated nitric acid.

In other words, if the concentrated sulfuric acid is not solved, the yellow fry will not be able to be made.

It is too difficult to concentrate sulfuric acid.

Xu You briefly told Hu Hongzhi about the causal relationship here, and said that there is no time limit and goal, if Hu Hongzhi is interested, he can often conduct research here, and it is okay to leave, but he must accept secret protection.

Hu Hongzhi's lifelong pursuit, he counted on Xu Youcheng to complete, where he was willing to go, he immediately said that he was willing to stay in Tiangongfang forever and take his family to live in Qiantang.

Xu You agreed with a smile.

Being a man can't get Long Wangshu, with the granular black fire, it is enough for Xu You to deal with the next changes in the current situation, what he has to do now is not to ask for yellow bombing, but to put forward suggestions for improvement, and the first thing to improve is the lead. Soak saltpeter with hemp rope to make a fire rope for later generations, as a fuse for detonation, which is safer and more calm.

Secondly, Zu Xiao strictly recorded the power of each kilogram of black fire to be blasted, and it can be quantified numerically with the defensive strength of the destruction, which is more scientific and convenient to use.

There are also some other details, all of which have been adjusted to a small extent, and at the request of Zu Hao, the black fire should be named Black Sky Thunder.

Subsequently, Xu You declared martial law in Phoenix Valley, and transferred five hundred soldiers from Fengying to station, and from now on, except for Zu Qi, no one else was allowed to leave, and all the necessities of life were sent in from outside.

During martial law, everyone's salaries were increased fivefold, and in order to solve the problem of entertainment, Xu You taught them to play backgammon and fight landlords.

Because of the Tianjing Jade Calculation Academy, Arabic numerals, that is, the so-called Tianjing characters have been accepted by most people, and it is easier to make the cards of the landlord, and the first batch of fifty sets are given away for free, and they are soon popular in the valley.

Of course, in view of the status quo of the times, the wealthy merchants of the gate valve family are all landlords, Xu You decisively changed the name of the landlord to Doutianshi, Sun Guan's obligatory title, and provided free portrait use rights. Anyway, Heming Mountain is so far away, you have the ability to come to Qiantang to ask for copyright fees.

The appearance of backgammon has made those scum who can't learn Go get the strange pleasure of blaspheming the goddess, and although the popularity is not as good as fighting the landlord, it is very popular with those sullen young people.

As a result, Jiangdong's invention named after "Xu Lang" has another "Xu Langbo".

Bo, Bo play, that is, gambling.

Ma Dan, let you entertain, you gamble, and let me name the back pot, but the back is still such a lewd pot, Sun Guan's pain, Xu You didn't take long to deeply understand it.