After a few small talks,

Before coming to the building on the other side of the mine.

At first glance, the building here is an office or living area.

Sure enough, Zhang Yan opened her mouth and explained:

"Lord, this is the living area of the mining area."

Lu Bu nodded,

Turning his head, he suddenly asked Zhang Yan:

"Xianzhong, take me to see where the workers wash first."

Zhang Yan was stunned when she heard this,

But reacted quickly,

Take Lu Bu and the others and walk towards a huge house.

The house is a traditional earthen house,

It looks huge from the outside.

Zhang Yan pointed to this house and said to Lu Bu:

"Lord, this is the place where the workers wash."

Lu Bu was about to raise his feet and walk over,

After thinking about it, he turned back to Zhang Ning, who had always been by his side, and said:

"Ning'er, don't go in with you. And you don't have to follow, just have Xianzhong alone to accompany me. ”

Zhang Ningqiao's face was slightly red,

She wanted to bring up the matter when she came over,

At this time, Lu Bu said it right in the heart,

Nodding, Zhang Ning turned around and left here.

Liao Hua, Zhou Cang and Pan Feng,

also bowed respectfully to Lu Bu and left.

Lu Bu pushed open the heavy wooden door,

A heavy dampness came to my face,

directly gives people a feeling of suffocation,

made Lu Bu suddenly a little uncomfortable.

After waiting for a few breaths,

Only then did Lu Bu adapt to the temperature and environment here.

It's a large airtight room,

There are more than a dozen huge wooden barrels lined up on one side,

On the other side is the stove,

There is a flame burning in the furnace,

Above the stove is boiling boiling water.

Lu Bu frowned,

I was about to ask,

Zhang Yan hurriedly replied:

"My lord, this is actually a bathhouse. When the workers came up from the mine, they were covered in filth and had to be cleaned repeatedly before they could barely clean their bodies. In order for the workers to be able to take a hot bath, we always have hot water on our side......"

Hearing this, Lu Bu nodded,

The face has become a little better.

Carefully circled around the bathhouse,

This large bathhouse is too simple,

Lu Bu pointed to the huge wooden barrels and asked:

"That's where the workers bathe, aren't they?"

"Yes."

Lu Bu asked suspiciously:

"How many workers are there in the mine right now, and how can these twenty barrels be used by everyone?"

Zhang Yan hurriedly explained:

"That's right, there are a lot of workers in the mine, and now there are about 50 people going down the mine, and it is impossible to prepare a barrel for everyone, but fortunately, everyone is working in shifts, and these 20 barrels are enough for everyone to use."

"Then every worker is bathing, this bucket of water must not be enough to use, right?"

Nodding, Zhang Yan replied:

"It's definitely not enough, that's why there's always hot water there. After the workers have washed it, they can go there to get water on their own, and then come here to change the water. ”

After a pause, Zhang Yan continued:

"A worker needs at least three buckets of water a day to be clean."

"Oh."

Lu Bu agreed,

And then he didn't speak,

Stood there in deep thought,

Only this time,

Before he could figure out his thoughts,

By the heat of this room,

I can't stand the suffocation.

Lu Bu took a closer look again,

Hurriedly took Zhang Yan out of this huge room.

After being exposed to fresh air,

Lu Bu breathed several times in succession,

This cleared my head a lot,

"Loyalty."

"The last general!"

Zhang Yan replied hurriedly.

"Master Zhang is here now?"

"Master Zhang is in the craftsman camp."

Lu Bu nodded and instructed Zhang Yan:

"Go and get him."

Zhang Yan nodded,

Hurriedly turned around and found a small school,

passed on Lu Bu's order.

Lu Bu raised his head,

Carefully look at the buildings on both sides of the cave,

Sometimes bow your head and ponder,

Sometimes gesturing with his hands,

Zhang Yan was by the side,

Afraid of disturbing Lu Bu's train of thought,

Don't dare to ask.

After about a pillar of incense,

Two men hurried over,

It was Zhang Da and Zhang Da who followed behind.

Today's Zhang Da's complexion looks good,

Growing a long beard,

But it's more powerful than ever.

After meeting Lu Bu,

Zhang Da hurriedly saluted respectfully and said:

"Zhang Da has seen the lord."

Lu Bu turned his head,

looked Zhang Da up and down,

Said with a smile:

"Master Zhang, I haven't seen you for a long time, and your complexion is very good."

When Zhang Da heard this, he replied with a smile:

"Thanks to the Lord's concern, now I don't have to worry about my livelihood, and I can still engage in the career I like, which is really happy for the villain. This is also thanks to the lord who provided me with such good conditions. ”

Zhang Da said,

While bowing sincerely to Lu Bu.

"Hahaha, good you Zhang Da, I didn't expect that we haven't met for a while, but you have learned to slap horses."

Lu Bu picked up Zhang Da and said jokingly.

After a pause, he continued:

"I called you over this time, because I have some things to explain to you."

Hearing Lu Bu talk about business,

Zhang Da also put away his joking attitude,

Zhengse said to Lu Bu:

"Please also ask the lord to command, Da will definitely do his best!"

Lu Bu nodded,

Pulled Zhang Da to the firing workshop he had visited before.

Lu Bu pointed to the workshop and said to Zhang Da:

"Master Zhang, you designed this room?"

Zhang Da nodded,

Cautiously spoke:

"My lord, what's wrong?"

Lu Bu turned his head and saw Zhang Da's somewhat panicked expression,

Knowing that he misunderstood,

Hurriedly explained:

"I don't mean that, the design of this workshop is very good, I just have some ideas, I want you to improve it."

"Improvements?"

Zhang Da's eyes lit up,

What Lu Bu meant when he said this,

It was he who had a novel idea again.

At this point,

Zhang Da admired Lu Bu so much that he threw himself to the ground,

Every now and then there will be some whimsy,

can make him, a person who has been immersed in this way for half his life, sigh to himself.

Lu Bu opened his mouth and said:

"You've done a good job of insulation, but I think we could improve it even better."

Lu Bu walked to the side of the outer wall of the workshop,

patted the sturdy façade,

The temperature here is already very high.

I'm afraid that ordinary people can't stand such temperatures at all.

Lu Bu said okay,

But Zhang Da was a little unbearable,

The work of this meeting,

Fine beads of sweat had already appeared on his forehead.

You know, it's close to late autumn,

Bingzhou is located in the north,

It's already cold at this time,

But in such a cold weather,

In just a few breaths,

Just close to the façade of this workshop,

And he sweated all over,

It's a testament to the high temperature here.

"Still,"

Lu Bu's voice changed,

Pulled Zhang Da away from some,

Then he spoke:

"It's still late autumn, and if it's summer, I'm afraid that this distance of several zhang can't be close to people."

Zhang Da nodded when he heard this,

The opening explained:

"The eldest lady and the younger lady have talked about this problem before, and the villain also thought about it for a long time, and then came up with this simple method, thickening the wall, building the wall with large stones, and stuffing some soil in the middle to isolate the temperature."

Lu Bu listened carefully to Zhang Da's explanation,

Nodding slightly,

Then he spoke:

"It's a good idea, but you can try to mix a lot of yarn, wood chips, animal fur and other things into the filled soil, mix it in the soil, and after filling it, it can play a better role in insulation. Although the temperature here cannot be the same as the outside world, at least it will not be too different. ”

Zhang Da thought about it carefully when he heard this,

Then he looked at Lu Bu suspiciously,

He asked:

"Lord, it's not that the villain doesn't believe it, it's just that these things are easy to find, and we have a lot of them here, but how can they be combined with soil to enhance heat insulation?"

Lu Bu shook his head with a smile and said:

"Hahaha, Master Zhang doesn't believe it?"

Zhang Da hasn't spoken yet,

Zhang Yan, who had been listening to the side, suddenly said at this time:

"Lord, I don't know what Master Zhang thinks, anyway, I don't believe that those wastes can play any role, since ancient times, they have been using mud to build houses to keep the temperature in the house. Today's firing workshop, but we have been experimenting for a long time, and finally reached the current level, your casual idea can be more useful, although the general respects you, but he can't believe it. ”

"Hahaha, good! In that case, I'll make a bet with you. ”

Lu Bu smiled slyly.

Seeing Lu Bu's smile,

Zhang Da felt bad,

shivered violently,

Hurriedly spoke:

"Lord, General Zhang, I still don't participate in this gamble."

When Lu Bu's smile appeared,

Zhang Yan also felt a sigh in her heart,

But in the bottom of my heart, I still don't believe in Lu Bu's method,

can work so well,

What's more, the words have already been spoken,

How could he break his word and get fat.

Squinted at Zhang Da next to him,

Then he looked at Lu Bu again,

nodded suddenly,

He said, "My lord, the last general will make this bet with you. ”

"Hahaha, dedication, since it's a bet, there must always be a lottery."

Lu Bu's eyes rolled,

smiled at Zhang Yan and said:

"After a while, I'm going to use troops, if you win, I'll appoint you as the main general, but if you lose, hahaha......"

Zhang Yan Wenyan,

Immediately overjoyed,

But then I was a little worried.

It's nice to have been silent for so long,

Lu Bu was finally willing to use troops again,

The military generals are eager to make contributions,

But in the past six months,

In addition to development is military training,

They're already tickling all over their bodies,

At this time, I heard that Lu Bu was going to use troops,

Naturally, I was very excited.

But the worry is,

In case you lose,

The position of the commander has become someone else's.

Bowed his head and thought for a while,

Zhang Yan gritted her teeth and said:

"My lord, the last general will make this bet with you."

"Hey, hey, hey." Lu Bu smiled very slyly,

made Zhang Yan's heart even more uneasy.

After laughing,

Lu Bu suddenly said to Zhang Da:

"Master Zhang, do you know how to burn bricks and stones?"

"Masonry?"

Lu Bu looked at Zhang Da's expression,

It immediately became clear that people at this time did not know the art of firing masonry.

Suddenly remembered,

historical research,

Fired red bricks originated in ancient Babylon famous,

It was introduced to the Central Plains after a long time.

At this time, the Han Dynasty people built houses,

Most of them are wood-based,

The use of masonry is also mostly made of ready-made bluestone,

Mining cut out for direct use.

Although it does not burn masonry,

But during the Han Dynasty,

The level of craftsmanship of the working people in firing pottery is already very high,

Therefore, it is relatively easy to implement the firing of red bricks now.

Lu Bu opened his mouth to explain:

"Today I'm going to tell you a method, this method fires something called masonry, it's very strong, and the specifications can be controlled by itself, which is very suitable for building use."

Zhang Da for this novelty,

It's already very sensitive and likes,

At this moment, I heard Lu Bu say this,

The itching in my heart is unbearable.

Reaching into his arms, he took out a few pieces of bamboo slips,

And a small piece of dark stone-like thing.

Seeing Lu Bu's somewhat puzzled gaze,

Zhang Da smiled embarrassedly:

"My lord, the villain sometimes has some sudden thoughts, so he has developed a habit of carrying something with him that is easy to record......

Lu Bu pointed to the stone-like thing in Zhang Da's hand,

"What is this?"

Zhang Da raised the item in his hand,

Explained to Lu Bu:

"This is coal, a small lump of coal that has not yet been fired, and the villain accidentally found that the traces of writing with this object are very clear and not easy to erase, so he uses it instead of pen and ink."

Lu Bu was stunned when he heard this,

Isn't this the first pencil?

He shook his head and stopped thinking about it.

Lu Bu said to Zhang Da:

"There are several steps in firing masonry: first, the soil must be taken first, which must be clay, which is suddenly soft and sticky, and the color is mainly red or dark yellow, which is one of the main raw materials. There is also a major raw material called coal gangue. ”

Lu Bu said,

While crouching down,

Pick up a stone from the ground that is a little blackened,

opened his mouth and said to Zhang Da:

"Master Zhang, you see, this is coal gangue. It is a kind of stone unique to the coal mining process, and its texture is relatively hard, which is a waste material for making coal, but it is the best raw material for firing masonry. ”

Zhang Da carefully observed the stone that Lu Bu handed him for a long time,

Then carefully put it away,

Painstakingly wrote on the bamboo slips.

After Lu Bu waited for him to finish recording,

Then he spoke again:

"Once the raw materials have been collected, the clay is left to dry in the wild, for at least half a year, until the water is completely dissipated until the soil is loosened. At this time, it is crushed and sieved by hand, leaving a fine pure soil. This is the second step. ”

In order to facilitate Zhang Da's recording,

Lu Bu deliberately said it slowly.

"The third step, the pure soil is mixed with crushed coal gangue, and a small amount of coal ash, add water, and repeat it more than six times like a dough, this step is the key to whether it is strong or not after becoming a brick. Manpower and refining are certainly not up to the requirements, and can be carried out by ox power or other machinery. ”

Zhang Dasheng is afraid that something will be missed,

Writing on the bamboo slips is very fast,

Fortunately, Lu Bu can slow down his speech,

So that he can keep up.