Zhang Da quickly recorded on the bamboo slips.

Lu Bu opened his mouth again and explained:

"The smelted soil is molded through billet molding, and the soil should be compacted when shaping, and the place where the bricks are placed should be covered with fine sand to prevent adhesion. And these bricks must be dried in the shade, and should not be exposed to the sun to cause cracks and deformation. ”

Zhang Da nodded,

Whispered repeated:

"It must be dried in the shade, otherwise the bricks will crack and deform."

Lu Bu smiled,

Continuing to explain:

"The bricks have to be dried until they are completely dry before proceeding to the next step, which takes about one to two months. At this time, these bricks can be fired in the cellar. This link is a crucial link that determines whether the masonry can be fired successfully. ”

After a pause, Lu Bu stretched out his hands and began to gesticulate:

"This cellar where the bricks are fired is also particular, and it is better to make a circular building with a width at the bottom and a narrow shape at the top, which will help to increase the temperature and concentrate. In fact, this coal-fired workshop can also imitate this structure. ”

I'm afraid that the explanation is not clear enough,

Lu Bu also took a stone,

Start drawing the shape directly on the ground.

After seeing the figure drawn by Lu Bu,

The two people on the side immediately understood what Lu Bu meant.

"If you want to make the masonry stronger, you can use wheat straw, pine branches, etc., to burn slowly, but in terms of time, it will increase a lot. Remember, the top of the brick cellar where the bricks are fired should be opened, but the opening should be able to be sealed at all times. ”

Zhang Da Wenyan,

Hurriedly marked it on the bamboo slips.

Lu Bu then opened his mouth and continued:

"The bricks need to be fired in the cellar for at least ten days, until the green is burned and condensed. At this time, you can choose two ways, the first way is to slowly turn off the fire, put the outside air into the cellar, let the temperature in the cellar naturally decrease, so that the color of the masonry obtained after natural cooling is red, and it can be used normally. Let's call it red brick. ”

Lu Bu stopped again at this point.

After Zhang Da quickly finished recording,

He asked:

"Lord, is there any other way that can't be done?"

Lu Bu nodded,

Again, he explained:

"Yes, there's another way. Remember what I said earlier, the top of this brick cellar should be movable, closed or opened. You can choose to use mud sealing, one is that the sealing effect is good, and the other reason is that it is flexible and convenient. ”

Zhang Da nodded,

Lu Bu's words were basically written down on the bamboo slips.

Another way is to seal the air vents at the top of the brick cellar so that outside air cannot enter. Cold water is then used to water the bricks to cool down. ”

After Lu Bu finished speaking,

After a pause of two breaths,

Then he added:

"In the process of operation, this method will be more troublesome, but it will take less time, and the color of this masonry is blue, which can be called green bricks. And the masonry made in this way has a much longer service life than that of red bricks. However, there is not much difference in the strength of the two types of masonry. In the future, this type of brick can be used when building the city walls. ”

Zhang Da nodded,

After a while, he finally wrote down everything Lu Bu said.

After a quick look at it again,

Zhang Da opened his mouth and asked:

"My lord, do you mean to use this brick and stone instead of the current bluestone and other buildings to build these buildings?"

Lu Bu nodded,

Spoken:

"Yes, exactly. Compared with bluestone, this material is lightweight, easy to polish, suitable for all kinds of buildings, and more solid and beautiful than tamping soil. Therefore, in the future, in our state, at least many key places, this material will be used as much as possible. ”

Zhang Da nodded,

Reassuring Lu Bu:

"Lord, don't worry, the villain will definitely study this masonry."

Lu Bu patted Zhang Da's shoulder,

said in a gentle tone:

"At this time, there is no need to be too anxious, if this masonry wants to be fired successfully, it will take about half a year just to dry the clay."

Zhang Da hurriedly spoke:

"My lord, it doesn't take that long."

"Oh? Why? If the clay is not fully weathered, the masonry produced will not be usable. ”

Lu Bu said uneasily.

Zhang Yan opened his mouth to answer for Zhang Da:

"My lord, the clay you mentioned earlier, we have it ready here. A large amount of this is also needed to burn the coal, so that the coal can be finally formed. Therefore, there is a lot of hoarding at the back of this firing workshop. It is like drying coal in front of it. It's just for the sake of distinction and ease of access that it's put on the back burner. ”

Lu Bu slapped his forehead when he heard this,

Suddenly realized:

"Hahaha, my brain actually forgot about it."

Turning his head, Lu Bu hurriedly instructed Zhang Da:

"Master Zhang, that's it. Later, you send someone to try different proportions, and make some mud to make bricks, and then you use this firing workshop to fire a batch of masonry, choose the best ratio for firing, and then use the best masonry to build a brick cellar. ”

Zhang Dazheng is about to agree,

After thinking about it, he asked:

"Lord, why is it so troublesome, after the development is successful, can't you directly use this coal-fired workshop for brick and stone firing?"

Shaking his head, Lu Bu explained:

"One is because I said just now that the style of the brick cellar is different from the current coal burning workshop, and this coal burning workshop also needs to be renovated, and the appearance needs to be similar to the brick cellar."

Lu Bu said as he drew a sketch on the ground again,

Explained to Zhang Da:

"The front of the brick cellar is a slender shape with a movable mud-sealed door at the top. This coal-burning workshop is still built to be square, but on the top of the workshop, I want you to make a ceiling out of steel. ”

"With iron?!"

Zhang Da looked at Lu Bu in shock.

Lu Bu nodded as a matter of course,

He replied:

"Not only must iron be used, but it must also be made with high-speed iron that has been forged repeatedly, and the top must be beaten into a giant iron pool."

Zhang Da was even more puzzled,

I don't understand what Lu Bu means,

Zhang Yan on the side felt even more confused.

Lu Bu looked at the two people who were puzzled,

The opening explained:

"That's the second thing I'm going to say, the renovation of the bathhouse."

After a pause, Lu Bu opened his mouth and asked the two,

"Does today's bathhouse need to keep boiling water, which is very troublesome?"

Zhang Yan nodded inexplicably.

Zhang Da reacted quickly,

Spoken:

"I see, the lord wants to use the heat of the coal burning to warm the water......"

Suddenly, Zhang Da frowned,

Speaking again:

"But the temperature when the coal is fired is very high, and even if the iron can withstand it, it can't be used directly."

Lu Bu said with a smug look:

"I had long thought that this iron pool was only for water storage, and under the iron pool it was also the roof of the firing workshop, and it still had to be built with bricks and stones for thermal insulation."

Zhang Da's eyes lit up,

I want to speak,

was interrupted by Lu Bu waving his hand.

Lu Bu then spoke:

"In addition to the iron pool, bamboo is used as a passage to connect another pool for a second cooling, and then different thin pipes are used to connect different outlets. It can be used directly. ”

While Lu Bu was drawing a sketch on the ground,

He explained.

He drew many lines on the other side of the second pool,

Used to represent the channel of the connection.

But next to these passages some lines of equal length and thickness were drawn,

Connected to another pool.

Lu Bu explained to Zhang Da:

"This pool is stored in the cold water, the two pipes are connected to the same outlet, and the middle is adjusted by using a mechanism, which can control the water output of the two pipes, if the temperature is high, the mechanism is adjusted to reduce the amount of hot water output, and the amount of cold water output can be reduced. Otherwise, the temperature can be increased. ”

Zhang Da was amazed again and again when he heard this,

But he found the problem in an instant,

"Lord, this passage is cleverly designed, but where to find such a long bamboo, if it is connected, it is feasible to use mortise and tenon, but it is possible for water to leak out of the connection, can it be replaced by something else?"

Lu Bu was stunned when he heard this,

This is indeed a problem,

He had previously considered that today's technology could not make hollow iron pipes.

That's why I thought of using bamboo instead.

You only need to open the bamboo,

It can be used as a pipeline for flowing water.

However, the question of how the bamboo is connected is overlooked.

Lu Bu's eyes rolled,

I immediately thought of a solution,

Pick up the stones,

Painted on the ground,

But after drawing it twice, I felt that I couldn't draw the shape I wanted.

Hurriedly said to Zhang Yan on the side:

"Xianzhong, you quickly go and get two wooden sticks, go quickly."

Zhang Yan Wenyan,

Hurriedly turned around and ran out,

After a short time, he ran back,

Holding two sticks of wood in his hands.

Lu Bu took the wooden strip,

Draw the sword from your waist,

Cut off the two sticks of wood,

Detritus flying,

In a short time, many threads were cut out of the two wooden strips,

Pick up two sticks of wood and make a gesture,

Although the threads are rough,

They can also bite each other.

After Lu Bu combined the two wooden strips,

Xiang Zhang Da explained:

"It's called threading, it tightens the bite area, seals it, can be used at the connection of the channel, and it's easy to assemble and disassemble. I don't know how to work as a carpenter, and the production is too rough, so when I actually make it, I can carve this pattern more finely. ”

Zhang Da took the two wooden sticks,

Writhing twice,

I saw that under the action of the thread,

The wooden strips bite together,

Although the two sticks of wood are now parallel to each other,

But who is Zhang Da?

At a glance, he immediately understood what Lu Bu meant.

"I understand what the lord meant, the two pipes connected are of the same thickness, at the junction of the pipes, the inner wall of one end is thinned, the outer wall of the other end is thin, and the two ends are engraved with threads, so that they can be connected."

Zhang Da explained,

While gesturing in the air with both hands,

He looked very elated.

"My lord, my lord is really a god and a man, where did such a wonderful idea come from?"

Lu Bu's rare face was a little red,

These are obviously the most ordinary things in the hereafter,

It's just that in this day and age, it's a rare thing that has never been seen before.

Lu Bu smiled,

For fear that Zhang Da would ask,

Hurriedly spoke:

"Master Zhang, it's thanks to you."

"Huh?" Zhang Da scratched his head suspiciously.

Lu Bu opened his mouth to explain:

"Master Zhang still remembers the keel waterwheel you designed by Yu Yao'er, and it was from there that I got my inspiration. The keel waterwheel doesn't use a lot of gears for bite. ”

Zhang Da nodded when he heard this explanation,

No further questioning was made.

This is in Lu Bu's arms,

The opening continued:

"Master Zhang, I call this mechanism a switch, the pool stands at a high place, and the switch stands at a low place, so after setting it, once the switch is turned on, the water will flow out naturally."

Zhang Da's eyes burst out with a divine light of surprise,

Nodding busily,

On the bamboo slips, he quickly recorded everything that Lu Bu had just said.

The head keeps tinching slightly,

He muttered in a low voice:

"But this switch is inevitably difficult to make, what kind of mechanism can do such a function? At the same time, it is necessary to be able to rotate flexibly, and it is also possible to control the size of the water flow and even turn it on and off ......"

Lu Bu is next to him,

Although Zhang Da's voice is not high,

But Lu Bu really listened,

At this time, I was also stunned,

Only then did I remember,

Although this switch is simple,

But that's for the technical processes of later generations.

Far ahead of this era too much.

Slowly recall the structure of the water supply switch of the later generations,

But he's a university professor,

Although it is not so that the hands do not touch the spring water,

But I haven't done the work of repairing, loading and unloading tap water switches,

Not to mention knowing how to make it.

While Lu Bu was meditating,

Suddenly heard Zhang Da's voice in surprise,

"Ahh Lord, I thought of it, I thought of it! ”

Follow the prestige,

I saw Zhang Da holding a bamboo slip in his hand,

Waving excitedly.

Only then did Lu Bu notice,

Zhang Da actually wrote several pieces of bamboo slips,

And both sides are densely covered with stuff.

Lu Bu felt many black lines appear on his forehead,

This Zhang Da actually carried five or six pieces of bamboo slips with him,

Fortunately, this bamboo slip is wide and thin,

Otherwise, you really can't take it with you.

Zhang Dake didn't know the messy thoughts in Lu Bu's heart,

He excitedly explained to Lu Bu:

"My lord, I have thought of how to make the switch, and I still use this thread designed by my lord. One end is made into a handle to control, and the thread of this end grows a section, and several holes are drilled into the top, which are connected to the pipes of hot and cold water, and the water flow can be controlled by rotating left and right. The other end is made up of several parts, so that the internal threads can be carved. ”

Zhang Da's explanation is somewhat general,

There is no physical demonstration either,

Zhang Yan next to him had already listened to the starry eyes,

But Lu Bu understood.

Shocked when he heard the words,

looked at Zhang Da with wide eyes,

Although he doesn't understand the actual internal structure,

But Zhang Da's explanation,

He understood it immediately.

He couldn't believe it,

Zhang Da was able to think of this,

Subconsciously opened his mouth and exclaimed:

"Master Zhang, you are truly a god, you are simply a genius!"