Push back a little bit of time.

Shuangshui Village, named Mingyuegang by Mei Yin, is a barren hill full of limestone, which has become different at this time.

On the whole, it is almost the same as before, but on the east side of this Mingyue Gang, a slightly flat place against the leg of the post has been built a cement kiln.

Mei Yin can become stronger by feeding pigs, and the cement manufacturing method obtained can be described as very comprehensive.

Not only did he know how cement should be made and how to choose stone.

At the same time, even how to build a cement kiln, I also know everything in detail.

Therefore, under his personal design and on-site guidance, the cement kiln was quickly built.

Of course, the cement kilns that are being built now are not the kind of cement kilns that are full of modernity.

It is a cement kiln that can be built under the existing level of today's Ming Dynasty.

Compared with the cement kilns of later generations, it is full of primitive style.

But at this time, it is not easy to build such a cement kiln.

Mei Yin is also confident that she can use this to fire qualified cement quality.

In addition to firing the cement that can meet the needs of building a house, and making himself and Li Jinglong earn a lot of money, it also makes Daming different!

At this time, the cement kiln was emitting smoke.

In the fire pit, some of the fires are burning and constantly heating.

The crushed limestone, quartz, clay, etc. in the kiln should be changed to turn into cement.

Looking at the firewood that was constantly being thrown into the fire, Mei Yin frowned.

If you use firewood to make cement, the amount of wood consumed is too great.

Too much money-burning.

Fortunately, now he just fired a little less and built his own house, so he naturally didn't consider the cost.

However, in the future, once large-scale production begins, it will be necessary to consider various aspects to reduce costs.

Otherwise, the cement will become an extremely expensive building material, and there is no way to popularize it.

And as far as he knows, although there are people who use coal as fuel in this era.

But it's not widespread enough.

Coal is also not easy to buy.

This needs to be solved in the future.

The production process of cement is also quite complicated.

It's not as simple as getting limestone into a kiln and firing it.

First of all, the first step is to open the mountain and take the stones.

The mined stones are then broken and ground.

In later generations, there were all kinds of mature large-scale machines, as well as corresponding technological processes.

It's not hard to do that.

But now it's different.

Now it takes manpower to do all this.

These two simple steps, in later generations, have become the most labor-intensive processes.

Especially opening mountains and taking rocks, it is really difficult to do.

The cement of this kiln that Mei Yin is burning now, the stone is directly the ready-made crushed stone.

So it's more effortless.

However, with the use of this crushed stone on the surface, it is difficult to obtain crushed limestone.

According to his understanding, most of the things at this time were used with hammers and chisels to open mountains and take stones.

Or when encountering some large areas that are difficult to get, it is to burn firewood to heat, and then pour cold water, using the principle of thermal expansion and cold contraction to make the stone crack.

Of course, there are also gunpowder to blow up.

But there are not too many of them blown up with gunpowder.

There are too few people who can make gunpowder.

The second is the gunpowder at this time, which is not too powerful.

Although it can be used to open mountains and take stones, the efficiency improvement is not as much as imagined.

"Eldest nephew, how about we get some gunpowder here to mine stones?

Otherwise, it would be too difficult for the stone to open.

It takes too much manpower and material resources, and it is not so easy to bring down the price of cement in the future.

The cost is too high.

It is not conducive to us to burn cement to make money. ”

Mei Yin stood here, thinking for a while, looking at Li Jinglong and asking.

"Second uncle, do you want to use this gunpowder to open the mountain and take stones?"

"Yes." Han Cheng nodded: "This is not a taboo, right?" ”

Li Jinglong thought for a while and said, "Your Majesty still attaches great importance to firearms, especially artillery.

During the water battle at Poyang Lake that year, he directly asked people to put artillery onto the warship to bombard Chen Youliang.

In the water battle of Poyang Lake, artillery also made a lot of contributions.

However, with the capture of the world and the expulsion of the Northern Yuan, His Majesty was not so keen on firearms.

The artillery was thus indifferent.

The main reason is that after recovering the world, if you go north, there is no decent city.

The Tartars, who had no fixed dwelling, rode to and fro on horseback.

The artillery was too bulky to be used.

The rest of the firearms are similar.

For example, the rest of the firearms, such as firearms, are also very good, but on the whole, except for some special circumstances, on the whole, the effect is not so great.

For example, the reload speed is too slow.

The second is that the fire gun can easily explode.

I didn't knock over the enemy, I blew myself and the people around me first.

Therefore, although His Majesty also attaches more importance to firearms, he does not attach so much importance to them.

Gunpowder is also a relatively important material in the barracks.

It is simply impossible to want to blow stones with gunpowder from the barracks.

Besides, in my current situation, there is no way to get gunpowder from the barracks, and my grandfather and my father will definitely not be sure. ”

Li Jinglong thought that Mei Yin wanted to let him get gunpowder.

If he agrees to ordinary things, but this gunpowder, he really has nothing to do now.

Mei Yin nodded understandingly: "Then if I don't get gunpowder from the barracks, I make gunpowder myself and use it in this mountain, right?" ”

When Li Jinglong heard this, he thought for a while and said, "If the gunpowder made by himself is only used to open mountains and take stones, then it doesn't hurt.

His Majesty has not issued any relevant orders to prevent this from being done.

However, gunpowder and firearms are not allowed to leak from the barracks. ”

Hearing Li Jinglong say this, Mei Yin was also relieved.

As long as you can make it yourself, it's not a big problem.

"But...... Second uncle, you still make gunpowder? ”

Li Jinglong reacted, looked at Mei Yin and asked curiously.

Mei Yin said: "I know some of the production process of making gunpowder. ”

Mei Yin didn't lie at all.

Later generations of his life had a special understanding of how to make gunpowder.

In the era in which he lived, most of the houses in his family were reluctant to use bricks.

The walls are all built with stones, and only when they get to the top and get up the house mountain, they are willing to spend money to buy some green bricks, or red bricks.

The stones used to build the houses were mined by the families themselves.

The gunpowder used was all prepared by himself.

At that time, ammonium nitrate was not a fertilizer that had not been banned from sale.

Therefore, if necessary, you can make your own gunpowder.

Now, Daming can directly buy saltpeter and sulfur.

Not to mention charcoal.

So he can really make gunpowder with his hands.

"It's just...... Second uncle, even if you can really make gunpowder, which can be used to open mountains and extract stones, this speed is not much faster than people using hammers and chisels to mine.

The power of gunpowder is not something we have never seen.

It's big, but it's not as big as it seems. ”

As the top second-generation of the Eight Classics, Li Jinglong has naturally seen gunpowder and firearms.

To be honest, he wasn't too interested in that.

I always feel that these things are troublesome to use, not to mention unsafe, and the power is not as great as imagined.

Mei Yin nodded: "Ordinary gunpowder is true, but what if I can make more powerful gunpowder?" ”

Li Jinglong: ???