When Yanagisawa returned to the prefectural office, the first thing he did was wave his hand and issue a document: "In another wider part of the Taikadai, by the sea, re-select the land." A brick house was rebuilt for the Kyushu Institute of Physics. ”

For the first time, Yanagisawa Hui made this decision with trembling hands, turned his head and asked his master: "You say, is 1,000 square meters of land enough?" ”

The master frowned and said, "Probably, three or five thousand is enough, right?" ”

"Then why don't you give them all the main beaches on the east side of Dafengtai?"

"I'll see it."

“……”

With a wave of his hand, another document was issued.

He turned around and asked, "Do you think they need money?" ”

"Definitely need. One thing you may not know is that they simply don't have the money to do these experiments. ”

Megumi Yanagisawa asked, "No money?" ”

"yes, they were going to do five trials. However, the voluntary donations of the local villagers helped them raise more than 2,000 yuan. ”

Megumi Yanagisawa asked in surprise, "Their money was donated by the people around them?" There are all fishermen near Dafeng Terrace, how much money can fishermen have? Will you be willing to donate to them? ”

Master sighed: "That's why I recommend that you definitely go and see it with your own eyes today." At first, they cut back on food and clothing, and pooled their money together to do this research. In the end, I don't know who came up with the idea of holding a fundraiser in the city. But it didn't work well. In the end, the villagers near Dafengtai knew about it, and they all went to see them to conduct experiments and research, and the next day, many people donated money to them. And now there are still donations from nearby villagers every day. ”

Yanagisawa Hui's eyes widened, full of disbelief: "It's a charity donation?" Could it be that this is why they don't close the door when they do their experiments? ”

"Yes, Li Zhen, the director of the Kyushu Institute of Physics, also invited the nearby villagers to come in and watch them do experiments and watch them do science. But the nearby villagers were very conscious, so they stood outside the door and watched, not daring to go in and disturb. In the end, Li Zhen directly said that the Kyushu Institute of Physics will never close. ”

Megumi Yanagisawa took a deep breath of cold air and said, "It's like this......"

“……”

The next day, the Kyushu Institute of Physics.

Li Zhen made the final revisions to the general drawings, gathered the opinions of everyone, and set the exhaust valve on the cylinder.

"The exhaust valve can be deflated manually according to the pressure critical point. In order to be more safe, we need to set up a double exhaust valve on the boiler as well. The boiler exhaust valve is an automatic exhaust type, do you have any comments? ”

Li Zhen pointed to the structure on the drawing and looked around.

Ruan Mingxue raised his hand and asked: "It is feasible to set a manual exhaust valve on the cylinder. As for the automatic exhaust type on the boiler, I still have some doubts. ”

Li Zhen smiled and said, "Mingxue, if you have any questions, just ask them." ”

"That's right. According to our design, the double pressure reducing valve on this boiler is linked to the pressure gauge. Take the safety value pressure of 60 should be exhausted to decompress, and the automatic pressure reducing valve, when the pressure value reaches the critical point of 70, the pressure gauge sends out the sound of the auxiliary pointer hitting the copper bell, and the internal steel wire automatically opens the valve for exhaust under the dual action of spring and pressure.

But it's all about the pressure gauge. What if the pressure gauge is broken? After the pressure crosses the line, people don't know, won't a dangerous accident happen? ”

Li Zhen nodded: "The suggestions made by Mingxue are very useful. If this is the case, then what about setting up a secondary pressure gauge on the outer wall of the boiler? Two pressure detection instruments are set on one steam engine, one is hooked to the automatic exhaust and the other is not linked to anything, reducing the degree of wear and consumption, and only giving visual data. In this way, security is also doubled. ”

Ruan Mingxue nodded: "In this case, although the trouble is a little troublesome." But it's also practical. ”

Li Zhen laughed: "There is still a long way to go, and we still need to study how to automatically decompress and exhaust, and how to always stabilize the pressure at an equilibrium value." There will always be a way, take your time, then...... Let's start building, shall we? This time, it was the first generation of steam engines. ”

"It's the second generation!"

"Haha, the first generation has exploded."

"Yes, the second generation of steam engines."

“……”

The blacksmiths in the city also came to the Kyushu Institute of Physics on a voluntary basis, and they felt that they were very important, and although they were obligated to work here, they felt that they were very honored.

Of course, Li Zhen will still pay for the materials himself, and he will still pay them a certain amount of wages.

Blacksmith Master Wang saw the new drawings and said excitedly: "It's different from the previous one? Did you research it? ”

Li Zhen smiled and said, "Yes." This second-generation steam engine has been worked out, so it's up to you to build it and test it right away. Master Wang, do you see any difficulty? Is there anything you can't overcome? ”

Master Wang looked at this drawing for a long time, and buckled the back of his head in embarrassment: "On this boiler, you want to open three spiral mouths?" ”

"Yes."

"It's easy to open three openings, but it's hard to get a spiral pattern."

"Master Wang, after so many tests, the test result is that only the spiral mouth can be durable and tight. If it is a snap-shaped mouth, it is easy to be blown out by the qi inside. ”

Master Wang nodded: "I have a suggestion, I don't know whether to say it or not." ”

Li Zhen hurriedly said, "Please speak." ”

"The spiral snap is a step-by-step thing that uses that bevel to link two objects together. However, this one is actually very difficult to come by. I have never heard of this form before, and if you hadn't told me the principle of screws and nuts, I wouldn't have understood. This is also what I figured out by feeling the stones to cross the river. It's really hard to build by hand. ”

Master Wang pursed his lips and said, "So, this spiral buckle can't be mass-produced, right?" Although these boilers are simple, boilers and everything can be mass-produced, but this little spiral pattern can't be mass-produced......"

Li Zhen was stunned for a moment, turned his head and glanced at Liu Jinghong.

The two of them woke up in an instant and forgot the most important thing!

Why restore the steam engine? Isn't the main purpose of this to spread the steam age to the whole of Kyushu? But it can't be mass-produced, which is doomed to be difficult, so how to promote? Promoted to Kyushu, it will be stuck because of the production process of a small screw and nut.

Li Zhen was silent for a long time, and he was speechless.

Master Wang sneered: "I don't know if what I said is right or wrong." But I have a suggestion, can we change the clasp that plugs the opening? In fact, mortise and tenon joints can also achieve such an effect. ”

Li Zhen smiled bitterly and shook his head: "No." The mortise and tenon joint is a snap-on structure, and if the card is deep enough, it will indeed be able to get stuck. But it is not easy to take it out. ”

Master Wang slapped his thigh: "Master Li, what era are you mortise and tenon." The mortise and tenon I am talking about is a five-pointed plum blossom-shaped mortise and tenon joint. It is a mortise and tenon joint used in a large project. ”

"Oh? Pentagonal plum blossom-shaped mortise and tenon? ”

"Yes, a cylinder is hollowed out. It is propped out with five pillars, and the inside of the pillar is extended by a spring, and the spring keeps the five pillars stretched out. There is a cable on the outside, and when the wire is pulled, the spring on the inside is tightened, and the five pillars that support the outside of the cylinder are retracted. ”

Li Zhen slapped his thigh and exclaimed: "And this kind of mortise and tenon? ”

“…… It's been invented for hundreds of years, and it's all used up, why don't you know? ”

Li Zhen turned his head and glanced at the surprised students of the Kyushu Institute of Physics, everyone looked at each other speechlessly, and after a while, laughed.