The cylinder is the difficulty of the whole steam engine, the key lies in the tightness of the cylinder and the piston, in the absence of lubricant and oil rings, air rings and other components, the sealing is too tight, friction and heat, easy to damage. However, if the seal is not tightly sealed, power will be lost, resulting in low thermal efficiency.

Regarding this point, Qin Song has no good way for the time being, so he can only hope for the finishing of the milling machine, try to maintain airtightness, and not cause too intense friction.

A truly sophisticated steam engine, after hundreds of years of improvement, has many key components, such as condenser, insulation, throttle valve, pressure gauge, etc., which are far from being possible with today's technology.

In short, the way to go is to make a prototype first and improve it slowly.

Under Qin Song's guidance, Alice began to concentrate on hand-rubbing the cylinder. Qin Song, on the other hand, fulfilled his promise by recording the method of training – Harald's captain's chamber 'sponsored' papyrus, quills, and ink.

"Discipline is above all else! A unit with vitality and combat effectiveness must be the supremacy of discipline. ”

This is the opening theme, and the main point of the point. All the training items are strictly abiding by the principle of discipline first, followed by the detailed rules, including queue training methods, physical training methods, etc., which are basically the set of military training that Qin Song has personally experienced, and it is easy to write.

After writing the training method, Alice's first finished product came out, a cylinder with a diameter of about 20 centimeters, and the inner wall was made of finished steel rods, which was wiped very flat and had no seam marks.

"Well done, Alice. Qin Song picked up the finished cylinder wall and measured the diameter with a ruler: "Your manual ability is indeed excellent, and it is perfect to be able to do this without the assistance of tools." ”

"When I was doing it, I drew a circle with a compass and cut it out with a thin wooden plank, and I used it as a measuring tool all the time. Alice wiped the hot sweat from her forehead, and while explaining, she looked down at the training method that Qin Song had written.

"Very clever approach. Qin Song did not hesitate to praise, without his prompting, Alice could think of this method on her own, which shows that she is not only using her hands, but also using her brain.

"Discipline is above all else. Qin, is this your training method?" Alice picked up the papyrus and looked moved, "Can I write a few words to my sister?"

"Absolutely. ”

Qin Song put down the cylinder and picked up the thin plate that Alice used as a measurement from the table, which was cut very finely, which could be used as a reference for the size of the piston.

"Alright. Alice held the quill and wrote a few words before standing up and looking at Mons on the table, and gently touched its crown: "Lovely Mons, I'll leave it to you." ”

"I'm here for you, Alice. Mons grabbed the folded papyrus and leapt into the air.

"Qin, next, let's make the stuff you talked about—the stopper?"

The piston is relatively easy, just a round discus with a connecting rod. Taking into account the thermal expansion and contraction effects, the piston and cylinder wall retain sufficient gaps.

Then there are supporting connecting rods, valves and other components, and finished steel pipes directly used for gas pipelines.

......

"Liya, this is what I asked Qin, that is, His Excellency the Wise Man, about the training methods of the army, I hope you can use them. Also, don't worry about me, I've had a great time here and learned a lot. While I'm writing to you, Qin and I are working on a big thing. As for what it is, maybe we'll see it tomorrow. ”

"If it's okay tomorrow, maybe you can come here. Of course, we Black Stone Collar may be able to prepare some gifts, such as food or something, there is no bread here, and we can only eat meat for every meal. If Luna is okay, you can bring her along, your six-legged foal is safe, right?"

"Alright, that's it, I'm going to keep busy. ”

"Hope to get your response, love you Alice. ”

In Blackstone Castle, Leah carefully read Alice's reply, and her joy could be felt between the lines, which made her worry disappear a lot.

"Big thing?" Leah closed the letter, and a king-sized clay pot bomb came to mind, and the power of the explosion was amplified more than ten times—

The picture is beautiful and makes Lia's scalp tingle.

For Qin Song's training method, Liya was very interested. In fact, what worries her the most is to train farmers who have no military literacy, and even teach the basic posture of holding a sword for most of the day.

"Discipline – above all else?"

......

"Bang, everything is blowing up! Tim, I promise, you're going to pee your pants in fright if you see it. ”

Early in the morning, Luna got up early and told her about the power of the clay pot bomb, leaving her mother, Kayce, and Tim dumbfounded.

Of course, she squatted on her ass and squatted in fright, and never said anything.

"I, I'm not going to pee my pants!" Tim looked incredulous, "Surely bragging, a broken jar." You've been talking about it since yesterday, and I don't believe it anyway. ”

Luna snorted with a wink, "How can you mortals imagine the wisdom of a wise man?" Let me tell you, the devil is sealed in that jar!"

"Luna, are you telling the truth?" Kayce frowned, in Luna's artistically processed statement, the power of the clay pot could raze a hill to the ground.

"Of course it's true!" Luna insisted, "Leah's armor is so broken that the edges are melting." Even the Holy Spirit Knight can blow up and make a mess of mud. ”

"It does sound scary. Caice was skeptical: "The wise man you are talking about, is he really that powerful?"

Luna clasped her fleshy cheeks with both hands, revealing a yearning expression: "It's not a question of whether he's powerful or not, he's really the kind of great sage who has mastered true knowledge." ”

Tim was still unconvinced: "I think you're lying." ”

Luna was about to retort when the door opened, and her cloaked father, Weimar, walked in with a worried face on his face, "Luna, I just received a message from Sir Leah that I would like to invite you to meet the wise man. ”

"Huh?" Luna jumped to her feet and said to Tim, "See, Your Excellency, you want to see me by name, what does that mean? ”

The appearance of the orcs made Weimar realize that he was now completely on the same front as the Blackstone Collar. But the number of troops is really limited, and this winter will not be peaceful.

Perhaps, Luna's wise man is the turning point.

"My daughter, of course, is likable. Weimar looked at Luna dotingly: "But in front of the wise, you can't be like at home." Gotta be noble and polite, understand?"

"Of course, Dad. Luna proudly puffed her small chest, "I'm not going to disgrace the Hemworths." ”

"If, I mean if ......," Weimar mused, "if you have the chance, you can stay there like Alice and learn more." ”

Weimar understands that if the orcs do appear on a large scale, the first option is of course to take refuge in Blackstone Castle. But this is not the best option, a large number and the farmer, coupled with his manpower, consumes very much, especially fresh water.

As long as the orcs besiege and not attack, then the castle will collapse sooner or later.

However, in Luna's description, the wise man had severed the heads of the orc overseers, apparently with great strength, as well as the scalp-tingling clay pots.

If there was a safe place in the Blackstone Realm, it would be Sage Canyon.

"I want to......" Luna said with some apprehension, "but I can't be so selfish, Daddy." If the orcs attack, I can heal your wounds. ”

"Luna, fighting the orcs is the worst option. Weimar shook his head and insisted, "Even if we do, our first choice is to flee to the castle." And now, you've interrupted your practice in order to keep your divine power full, which is not a good thing. ”

"Uh-huh......" Luna's expression was a little tangled.

"Don't worry, Luna, I've met with Leah briefly and explained the situation. She agreed, so, you can try and stay there. ”

Luna nodded, "Okay." ”

"Caisse, what about the seeds I asked you to find?"

"Here. ”

Kayce took out a bag from the back room, which contained seeds from crops that were relatively rare in the Kingdom of Tia, and were basically stolen from merchants from other countries.

Corn can be made into sugar, which gave Weimar a big touch, and he knows the value of sugar too well. Moreover, this sugar is closely related to his daughter, and if Blackstone Castle sells the recipe or manufactures it in the future, it will definitely share a part of Luna's profits as a reward.

As the head of the family and the master of the camp, Weimar must take a long-term view.

So, there might be some miracle to let Caice collect some strange seeds in the storage house.

"Luna, take these seeds with you, perhaps the wise have a way to tap into their potential. Go ahead, embrace knowledge, Daddy will always have your back. ”