During the discussion, Zhu Youzhen saw a figure flashing in the courtyard, which seemed to be Sun Yuanhua, who had not been seen for a long time.

"Mr. Sun?"

Zhu Youzhen shouted loudly.

"See His Royal Highness King Shin."

Hearing Zhu Youzhen's shout, the figure in the courtyard who had turned around and was about to leave turned back.

Zhu Youzhen is not mistaken, the figure is indeed Sun Yuanhua.

"Mr. Sun, I haven't seen you for a long time, are you sick? Would you like to ask an imperial doctor to take a look at you? ”

Seeing Sun Yuanhua's tired and haggard and unkempt image, Zhu Youzhen asked with concern.

Speaking of which, since Sun Yuanhua began to study iron mold casting cannons in October last year, Zhu Youzhen has not seen him.

Zhu Youzhen originally thought that Sun Yuanhua had gone home for the New Year, but Sun Yuanhua's current appearance really didn't look like he had returned home.

"The student is still in good health, thank you for your concern."

Looking at Zhu Youzhen's worried eyes, Sun Yuanhua couldn't help but explain: "The student just didn't have a good rest." Just get a good night's sleep. The imperial doctor doesn't have to worry about it. ”

"Mr. Sun, are you still busy casting iron molds?" Hearing Sun Yuanhua say this, Zhu Youzhen breathed a sigh of relief, and he casually found another topic.

It has been more than three months since October last year, and Zhu Youzhen has not heard the letter.

Is this iron mold casting cannon so difficult, Sun Yuanhua hasn't made it yet?

"Ugh."

Sighing heavily, Sun Yuanhua said in annoyance: "This iron mold casting cannon, the student has completed it."

It took the students three months to make a total of 20 sets of clay models.

God willing, the students finally came up with a suitable set of iron molds.

It's just a cannon ...... made of iron molds."

At this point, Sun Yuanhua paused, as if he was looking for suitable words to describe it.

"Is it a cannon made of iron molds that doesn't work?"

Xu Guangqi interjected from the side.

"Teacher."

Sun Yuanhua first saluted Xu Guangqi respectfully, and then said bitterly: "The cannon cast by the students with iron molds, they say that the firearms bureau is not qualified?" ”

"Is it really unqualified?" Xu Guangqi's eyebrows couldn't help but move.

"Compared with the cannon cast by the clay mold, this iron mold cannon is a little brittle, yes, it's a little brittle."

Seeing that Xu Guangqi was displeased, Sun Yuanhua hurriedly explained. In a hurry, Sun Yuanhua found the adjective he wanted.

"Brittle?" Xu Guangqi's suspicious gaze was fixed on Sun Yuanhua.

"Teacher, the student cast a 5-pound cannon designed by His Royal Highness.

In order to compare the advantages and disadvantages of the iron mold gun and the clay mold gun, when the students made the iron mold mold, they also deliberately used the clay mold to cast 10 5-pound guns.

The students' luck was not bad, and the clay mold cannon also successfully cast 3 pieces this time. ”

Saying this, Sun Yuanhua's voice became heavy.

"When the students did the limit experiment of 3 times the charge of the two guns, the clay mold cannon was fine.

Those iron mold cannons, iron mold cannons, but there are tiny cracks. ”

Speaking of this, Sun Yuanhua's voice couldn't help but stuck.

"What?" Xu Guangqi shouted angrily: "There are cracks, you still say that the iron mold cannon is just a little brittle?" ”

"This, sir, don't be angry first, let Mr. Sun finish first." This time it was Zhu Youzhen's turn to play the round.

"This triple charge experiment was still done by the Lone Firearms Workshop.

The purpose is to test the extreme endurance of the barrel.

Sir, do you think that in this ordinary war, no matter how strong the charge is, it will not be loaded with 3 times the medicine, right?

3 times the charge, that is only used to test the limit of the gun body, does not mean that the quality of the gun body is not up to standard. ”

Listening to Zhu Youzhen's persuasion, although Xu Guangqi still had anger on his face, he slowly calmed down.

Seeing that the teacher was calmer, Sun Yuanhua hurriedly explained: "Teacher, I said that the iron mold cannon is a little brittle, but that's what it means.

According to our original double-charge test, there is no problem with the iron mold cannon.

Teacher, you don't know, this iron mold cannon is much faster than the clay mold.

Not counting the time of casting the mold, the iron mold is much faster than the clay mold compared to the casting time.

After pouring the iron juice in the clay mold, it will take several hours just for the iron liquid to solidify and form. It will take a few days to wait for it to cool down completely.

The iron liquid cast in the iron mold can be solidified and formed in less than an hour. There is a time for the iron juice of the clay mold cannon to solidify, and the iron mold can be disassembled.

In addition......"

didn't wait for Sun Yuanhua to finish speaking, Xu Guangqi split his head and said: "This iron mold cannon is brittle, it should be considered unqualified, right?" ”

"This, this ......", Sun Yuanhua's face was full of grievances, and he was speechless for a while.

Sun Yuanhua didn't expect that the teacher Xu Guangqi would have the same tone as those outsiders.

"You, you!" Xu Guangqi pointed at Sun Yuanhua and said: "You said how old you are, why are you still in such a temper of quick success."

Is there a way to learn this overnight?

3 times the charge, the clay mold cannon is fine, the iron mold cannon has a problem, you don't study where the problem is, but only pay attention to the advantages of the iron mold casting cannon fast.

The 3x charge was to test the limits of the gun body. But that could only test the gun's resistance to gunpowder once.

The barrel of this cannon will heat up when fired, and it is easy to blow up the barrel if it is fired repeatedly.

Your iron mold cannon is brittle, then it will definitely be easier to blow up than the mud mold cannon.

That's it, you still complain about the Firearms Bureau saying that the iron mold cannon is unqualified?

Is this obviously unqualified!

You, you always want to take shortcuts and shortcuts, you will suffer a big loss sooner or later, and you will have a big fight. ”

The more Xu Guangqi spoke, the more angry he became, and his beard and eyebrows became fluttering.

Seeing Xu Guangqi furious, and reprimanding Sun Yuanhua harshly as never before, Zhu Youzhen didn't dare to play a round this time.

Xu Guangqi is right.

It is true that we cannot rush for quick success and quick profit in doing this study and research, and Zhu Youzhen himself has made mistakes in this regard.

Not to mention, he recently got that rooster experiment, otherwise he would have lost face.

That little experiment was messed up, and he Zhu Youzhen only lost a little face, but if something went wrong with this iron mold casting cannon, it would really kill people.

If a large number of artillery problems lead to the loss of the battle, it will not be one or two people who will die.

With such a serious issue of principle at stake, Zhu Youzhen really didn't dare to mess around.

However, looking at Xu Guangqi with a white beard, and Sun Yuanhua, who is old with a beard like a primary school student, Zhu Youzhen still couldn't help but want to laugh in his heart.

Afraid that Sun Yuanhua would not be able to hold his face, Zhu Youzhen hurriedly saluted Xu Guangqi and left the research institute in a hurry.

Xinwangfu, study.

"What did you say?"

Zhu Youzhen yelled a little out of shape.

"This Tu Wenfu, how dare he slander Gu like this."

Hearing the news that Tu Wenfu secretly accused him of rebellion, Zhu Youzhen's back was cold.

It's terrible, didn't I just stir up a piece of land for him in Dong'an?

How much hatred can this be, why is this Tu Wenfu's heart so small?

The arrest of the Feng brothers really has nothing to do with me, it was the hand of Dongchang.

Why didn't this old Tu go to the trouble of the East Factory, am I particularly easy to bully?