"Don't think I'm not there to do whatever I want!"

"What I can tell you is that the substitute teacher has a bad temper and annoys the ...... Tut-tut......"

"That's it, from today onwards, you're free!"

"But only if it ...... Before I get back, get the steam engine, get it done!"

Lin Zifan waved his hand, and in the bewildered eyes of the students, he walked out of the classroom, and even walked all the way out of the school......

"Substitute teacher?"

"What's the situation?"

"I don't know!"

"What do we do now......? Play?"

"the bullt! The devil knows how long the black-hearted maggot will be gone, and if it comes back soon, we won't make anything, a thousand times the ninety-nine multiplication table, you will copy it for me?"

"Whoever, whoever likes to copy, I don't copy anyway!"

"Why don't you take out the book and take a look, what the hell is a steam engine?"

After a moment of confusion, the students were all anxious......

Although the 'black-hearted maggot' will not be there for a while, but after thinking about it, if he can't complete the task he assigned, it seems to be even worse, right?

So, they all panicked, opened the book, and began to look for the pages with clues to the steam engine, preparing to get the steam engine done as soon as possible......

On Earth, maybe a group of teenage children can easily get a simple version of the steam engine after various references, but in Datang......

It's really difficult.

After all, there is a lack of information, and there is no computer or anything for them to check knowledge, and even the head of the mansion, Lin Zifan, has become a hands-off shopkeeper, and there is only one substitute teacher who doesn't know who to supervise......

"Alas, a maggot with a black heart is a maggot with a black heart, in vain I thought he would show mercy......" Lin Siyu flipped through the textbook and muttered.

......

Out of the school, Lin Zifan took a few girls in spring, summer, autumn and winter, and came to the military department for a while.

"Lin Shangshu, why do you have time to come to my military department?"

Liu Qianyue and Liu Shangshu of the military department said a little strangely: "The sun is coming out in the west?"

"Liu Shangshu, where are you?" Lin Zifan smiled: "I naturally have nothing to do but go to the Three Treasures Palace. ”

"Please. Liu Qianyue smiled and nodded.

She is a relatively straightforward person, and at the same time, she doesn't have so many twists and turns, and she won't beat around the bush, so Lin Zifan didn't say anything polite to her.

But if you get along with your cheap godsister Li Shangshu, you must not be so direct.

Even if you can say it clearly, you have to do everything you can to make your words sound like a riddle, and let people guess for themselves......

Otherwise, I'm afraid that I will have to help others count the money if I am sold.

"I heard Li Shangshu say that the people of the Ministry of War and the Ministry of Mutual Household joined forces to conduct a thorough investigation in the major famous mountains and rivers in the Tang Dynasty to find out whether there was an iron ore. ”

"After that, the records of the thorough investigation were placed in the military department, and I came here to borrow the records of that year. ”

"I see!"

Liu Qianyue suddenly realized: "Could it be that Lin Shangshu wants to see, what else has been missed?

"For example, we have never entered the six life forbidden areas......"

She didn't know Lin Zifan's decision with the empress, so she thought that Lin Zifan wanted to find more iron ore.

At this moment, Lin Zifan didn't say much, just smiled, which was considered a tacit acquiescence.

The reason why I want to borrow the records of that year is naturally to make it easier to find copper and tungsten!

If you look for a needle in a haystack to find it yourself, Datang is so big, the ghost knows where to find it.

But in the recorded materials of that year, clues must be found!

After all, although they were looking for iron ore back then, they had tested almost all the stone samples in the mountains of Datang, and if there were these two metals, there should be a record!

Even if they didn't know that it was tungsten and copper, as long as the characteristics of those ores were recorded, Lin Zifan would be able to distinguish them one by one.

"Lin Shangshu, you really don't want to rest for a day!"

Liu Qianyue smiled with some admiration: "Please come with me, I will personally take Lin Shangshu to check the records of the year." ”

"Even, if Lin Shangshu can use it, just take it away, anyway, it's useless to put it here with us......"

Lin Zifan: "???"

Why is this thing useless?

He was a little puzzled, but after just a few minutes, he understood why Liu Qianyue said that.

"It's really 'useless'......"

Looking at the record data in front of him, the dust was at least an inch behind, and the corners of Lin Zifan's mouth couldn't help twitching slowly......

There is a lot of information as a whole, due to the lack of paper in Datang that year, so the recording materials are animal skins, and the animal skins are very thick, and they look more!

A large pile of recording materials was placed in front of him, making Lin Zifan roll his eyes.

"This has to see the Year of the Monkey?"

"Well, let's move back and watch it......"

Anyway, it's useless to keep these records in the military department, so it's better to bring them back!

With this idea, Lin Zifan took the initiative and asked the women in spring, summer, autumn and winter to bring back the record documents, Liu Qianyue saw it, and did not stop it at all, but was a little happy to send them away......

"That's all there is to it. ”

When the backs of Lin Zifan and the others disappeared, Liu Ruyan muttered: "This thing, you can't throw it, it's still afraid of being bad if you put it there, someone will take over, it's best to ......"

Throw?

It's a pity that it took a lot of manpower and material resources to get the record documents back then, and they are occasionally useful.

This record document has been kept in the Ministry of War in recent years, but it makes Liu Qianyue feel that she is carrying a hot potato, and now that Lin Zifan has taken it away, she is naturally in a good mood.

Back at the logistics mansion, Lin Zifan began to open the records for the first time.

And the maps in these materials made him almost blind......

"Hmm...... is worthy of being a person of the Tang Dynasty, the style of drawing maps is simply in the same vein, like a ghost drawing symbol, and if you can read it, you will see the hell!"

He grinned for a while......

The map is clearly a few lines, well, abstract and simplified to the extreme, what can be understood is the problem......

"It's good that there is a written record, otherwise it would be really troublesome. ”

In the midst of muttering, Lin Zifan gradually fell into a trance......

"Southeast of Chang'an, more than 1,100 miles away from the mountain rocks, without any abnormality, are ordinary stones......"

"To the north of Chang'an, the mountains and rocks of more than 700 miles are slightly green, but they cannot be smelted to produce iron......"

Why can't the gods smelt iron with a slight blue color, and use it to smelt iron if the color is wrong?

He couldn't laugh or cry, so he could only continue to look down, and this time it was almost a night......

Fortunately, at dawn, there was finally something to gain.