Hearing Ou Tiexin's invitation, Yan Liqiang laughed and readily agreed, "Haha, that's what I mean, even if Master Ou doesn't say it, I want to go and see, is this water and fire machine workshop in front?"

Ou Tiexin pointed to the front, "The workshop that made this water and fire machine is in front, just a few steps away!"

"Hahaha, Liqiang, when I heard that you and Master Zhang had come up with a water and fire machine, Tiexin asked people to buy three water and fire machines from Pingxi County and transport them back, and as soon as they came back, they took a bunch of craftsmen to dismantle and study the water and fire machine, and began to imitate it, Tiexin was full of praise for this water and fire machine!" Luo Yutian also said with a smile, and then looked at Ou Tiexin, " Tiexin, if you have any problems this time, you can ask Liqiang for advice in person this time, this is a rare opportunity, even if the other craftsmen want to ask Liqiang to guide, they may not be able to move!"

"Hahaha, Brother Luo is polite, I'm here today, and I'm here to have a long experience!"

Luo Yutian pointed at Yan Liqiang, "Be modest, you are humble again!"

Yan Liqiang smiled......

"I have a question I want to ask Lord Yan for advice, I heard that this water and fire machine was originally invented by the Lord and Zhang Yourong, the world's first organ master of the Lingshan Sect, I wonder how the Lord would have thought of inventing this thing in the first place?" Ou Tiexin asked, he asked, and the accompanying craftsmen all showed a look of listening, because of this question, they were also very curious, it just happened that the master craftsman of Tiangong came to the craftsman city today, so he wanted to listen to it.

"At that time, Brother Zhang had made a few gadgets with his own hands, took them out and discussed with me, wanting to make that thing run endlessly without manpower, we discussed together, once when making tea and tasting tea, I saw the boiling teapot under the impact of water vapor The teapot lid fluttered up and down and moved, so I got inspiration and found a way to use the power of water and fire to push things to run endlessly!"

"Admire, admire, I didn't expect that such a sharp weapon as this water and fire machine was actually drunk from tea!" Ou Tiexin and a group of craftsmen listened, and they all looked at Yan Liqiang with amazed eyes, if Yan Liqiang didn't say it, they wouldn't have thought that this water and fire machine was actually invented by two powerful people drinking tea together and seeing the teapot being boiled, and the cowman was really a cowman.

"To the end, take the road of things, learn from things, look at all things and do both, benefit the world, and live for generations, you must not despise the ability in your hands!"

Hearing Yan Liqiang's words, Ou Tiexin and a group of craftsmen were shocked, feeling that these words had infinite charm, which was enough to make the craftsmen use them for life, and even Luo Yutian couldn't help but praise them again, "Liqiang said it well!"

The group said, did not walk for a while, and arrived at a large workshop covering an area of dozens of acres, which is a workshop that manufactures water and fire machines in the craftsman city, there are two big chimneys in the workshop, which are steaming and rolling......

When everyone came, a group of craftsmen in the workshop of the water and fire machine were busy with their work, and a person who looked like a craftsman was sweating profusely and hurriedly ran over, saluting Luo Yutian, Yan Liqiang and Ou Tiexin and others, and then took everyone to inspect and visit.

Under the leadership of the craftsman, everyone walked to the workshop, and just saw a bunch of craftsmen busy working, the manufacture of this water and fire machine, the most critical and important parts are cast, so the most important process in this workshop is casting.

"Master Ou, I think this workshop of the water and fire machine should have just been expanded, right?" Yan Liqiang looked at it while walking, there is a very rudimentary assembly production model in this workshop, but Yan Liqiang glanced at it, and he could still see that the iron-melting furnace and those sand boxes were very new, as for the casting process, not to mention, it didn't look much different from the manufacturing bureau under him, but in fact, in such a casting process, some subtle differences were enough to bring a huge impact.

"My lord can also see that there are not many utensils that need to be cast for the things produced in the craftsman city in the past, so this casting workshop is not big, but to make water and fire machines, the previous casting workshop is not enough, it must be expanded, and the workshop in front of me is newly expanded!" Ou Tiexin said while looking at Yan Liqiang, and said completely straight, " Although water and fire machines are also produced here, the water and fire machines that we built in the same way as the parallel cargo planes of the manufacturing bureau under the command of adults are not as good as the water and fire machines of the adult manufacturing bureau, and there are often problems......"

"Is it true that there are often sand holes in the castings you pour?" Yan Liqiang said casually.

"Ah, my lord, do you see it?" Ou Tiexin and a craftsman all looked at Yan Liqiang in surprise, everyone didn't expect that Yan Liqiang just came here to take a look, and suddenly found the problem, "We have too many problems here, only one or two of the ten can be used, it is inefficient, and it costs a lot, it is really nerve-wracking, Lord Luo rewarded a thousand taels of gold to seek a solution, and no one has been able to solve it......"

"The sand mold is being cleaned over there, let's ......go over and take a look," Yan Liqiang said, and came to the place where several craftsmen in the workshop were dismantling the sand box, and watched those craftsmen cleaning the sand mold outside the casting.

As the sand mold is cleaned, the casting under the sand mold also reveals its original appearance, this casting is the most critical cylinder component of the water and fire machine, such a part can only be formed by the method of casting, and it is completely impossible to knock and beat.

Yan Liqiang squatted down and looked, on the surface of the cylinder that was cleaned out, with the naked eye, you can see a lot of sand holes, which greatly affects the quality of the cylinder, he grabbed a handful of cleaned sand mold with his hand, put it on his hand and rubbed it, and then stood up, such a problem was also encountered by the manufacturing bureau at the beginning, but it was later solved by Yan Liqiang relying on the strong knowledge reserve ability in memory.

Speaking of the Han Empire is also a sad place, the casting process, in fact, is not complicated, the process of sand casting has long been there, in addition to this process, the more complex cavity wax melting casting method is also available, but these casting processes, for a long time used in the place, is not used to improve production efficiency, but used to cast those exquisite all kinds of ritual utensils and the like, such as a variety of tripods, bells, and funeral things, these things are cast with copper or silver, to put it bluntly, it is for the powerful fish and wealthy families to enjoy and highlight their status。

And used to improve the production efficiency of the whole society on the casting and forging of iron and steel, it is pitiful, correspondingly, casting has become a build, and finally can only rely on the blacksmith to create a little thing, the productivity of the whole society, for a long time can not be improved, even with the casting process, but also long-term stagnation, really understand the steel casting of the character, is simply a rare existence.

Although there is only a one-word difference between casting and building, the direction of social development that has evolved subsequently is very different, one is still an agrarian society, and the other is striding forward in the direction of initial industrialization, and finally riding the dust......

It is estimated that this craftsman city rarely casts any steel artifacts before, so now he began to imitate the water and fire machine, only to find that although the process is that process, it seems that it is not complicated and can be mastered, but because of some subtle differences, they can't make a finished product like the manufacturing bureau anyway.

"My lord, can this problem be solved?"

Yan Liqiang patted the dust on his hands and stood up, "This problem can be solved!"

"Then I don't know where this problem comes from, a group of us craftsmen have been thinking about it for a year, but we haven't found out what the problem is?"

"Do you use straw ash and dry sand when you gather sand?"

"What's wrong with this?" Ou Tiexin looked at Yan Liqiang suspiciously, "Some of the utensils cast in the craftsman city before, when they were made into sand molds, they weren't exactly like this, but there were no problems before?"

"Are the objects you cast of brass or iron?"

"It's copper!"

"The melting temperature of iron is almost half higher than that of copper, and the weight is much larger under the same volume.

Ou Tiexin's spirit was shocked, and he hurriedly bowed his hand to Yan Liqiang, "Please also ask the adults to give advice!"

"The most important reason why the casting iron mold will produce sand hole is that the surface strength drops sharply after dehydration and drying after the sand mold solidifies, and the surface sand particles are easily eroded and fallen into the molten iron by heavier and hotter molten iron, so that the sand hole will be produced, if you want not to produce sand holes, you can not use straw ash and dry sand when gathering sand, but must add clay with greater humidity, or mix with a little paste and stir together, and then the sand mold should be heavily pressed and formed, and before the sand mold is cast for half an hour, the sand mold should be sprayed with water mist, do not let it dry, remember......”

Yan Liqiang said, but the secret method among the craftsmen, worth 10,000 gold, if placed elsewhere, this is definitely the unique skill of those craftsmen's families to pass on men and women, hearing Yan Liqiang say this solution to the casting trachoma, Ou Tiexin and the head craftsman next to him were overjoyed, one by one looked at Yan Liqiang with adoring eyes, this heavenly master is really not blown out, just look at it, you know the problem......

Luo Yutian also laughed, "Liqiang, in this way, the water and fire machine made in this workshop can probably be the same as the one made by the manufacturing bureau under your command, right?"

"Does Brother Luo want to hear the truth?"

"What truth?"

Yan Liqiang shook his head, "Even if this problem is solved, the water and fire machine made in this craftsman city workshop is only better than your previous one, but compared with the manufacturing bureau, there will still be a gap, and this gap is very difficult to make up, and the gap may get bigger and bigger in the future!"

Ou Tiexin, who was still a little happy just now, was suddenly unconvinced, "My lord said this, I'm afraid it's an exaggeration, how can there be such a big gap between the same water and fire machines?"

Luo Yutian also looked at Yan Liqiang with a puzzled expression......

Seeing a short hair sticking to the leather apron worn by Ou Tiexin, Yan Liqiang reached out and pinched the hair, " In my manufacturing bureau, the weight of this hair, the thickness of the geometry, the volume of the geometry, I require all qualified craftsmen to be able to fully measure and calculate, if you want to use copper and iron to make the same thing as this hair, everyone must also draw the same drawings, people who have not seen this hair to do according to the drawings, can make exactly the same thing, I don't know in this craftsman city, who can tell me the weight of this hair, thickness geometry, volume geometry, you draw drawings, let others do it, how many people can make exactly the same thing as this hair？”

A group of craftsmen, including Ou Tiexin, heard Yan Liqiang's question, and then looked at the hair on Yan Liqiang's hand, and they were all dumbfounded.

Or Ou Tiexin was the first to react, "Could it be that there are different measurement systems in the adult's manufacturing bureau?"

Yan Liqiang nodded, "Yes, a new set of weights and measures has been adopted in the Manufacturing Bureau under my command and the Thousand Machine Hall of the Lingshan Sect, and if there is no more accurate standard of weights and measures, it will be difficult to have greater development, and everything in the world must be measurable for us craftsmen!"