After talking about the last page of 'ppt' related to the railway, Zhu Yuan gave the people around him a little time to taste, and then led everyone to another long table covered by red silk.

"Just now Zuo Xiang and Qian Shangshu both asked how to realize the national railway construction, here, is part of the answer," said, Zhu Yuan motioned to the craftsmen to carefully uncover the red silk, revealing a series of strange machinery with a size of about one foot: "I call these 'construction machinery', because the time is too short, for the time being, only one look has been made, and it cannot be run, but since the 'steam engine' as the heart has been completed, it is only a matter of time before the finished product is made in the future." ”

Everyone approached and looked closer.

The so-called 'construction machinery' in front of you has a square bucket, some have a digging shovel, some have a boom, and some have a rolling roller.

There were all smart people present, and just by looking at the shapes, everyone could roughly guess the purpose of these things.

Zhu Yuan soon began to explain: "The so-called 'construction machinery', simply put, is used to build roads, bridges, canals and other infrastructure machinery and equipment, compared with labor, the biggest advantage of these equipment, is ultra-high efficiency, a construction machinery can complete the workload in a day, and may even be worth hundreds of pure human operations." ”

"Let's start with the truck," Zhu Yuan gestured to the first one, and only then did he feel that something was wrong, the truck...... Why is it called a truck...... It seems to be a transliteration, forget it, this is the last verse, and I took the initiative to skip it and continue to tell: "Obviously, this is a large cart used to carry goods, which can also be called a truck." Don't look at the model is small, in fact, I hope the size of this van in the future, eh...... It's about the size of a warehouse next to it, and if you add one or two carriages and a wagon like a train, it won't be a problem to transport hundreds of tons of goods at a time. Oh, I just said, 1 ton is equivalent to 1,000 catties, and 100 tons is 100,000 catties. ”

After a pause, seeing that no one asked some possible low-level questions, Zhu Yuan mentioned it himself: "Everyone may think, since there is a train with a larger load, why do you need a truck?" Very simple. After all, trains are limited, and we can only build them on the main transportation arteries, and transportation outside the transportation arteries has to rely on freight cars. Let's just say one, in the process of railway construction, we need to transport a large number of rails, wood, stones, etc., from the relevant material production area to the railway site, if only rely on the traditional oxen to pull people, I am afraid that a railway can not be repaired for hundreds of years, but, with trucks, it is also necessary to pull a large number of trucks with a performance of 100,000 catties of materials, so that we can complete the construction of the railway within a reasonable period of time and cost. ”

Zhu Yuan said this, this time it was Yang Siyi, the head of the household, who raised a question: "Pingzhang, as you said, this card ...... The load of the truck can reach 100,000 catties, I am afraid that it is ...... Ordinary roads are impassable, right? ”

"That's the problem," Zhu Yuan nodded with a smile: "So, before the railway era, we must first use these construction machinery to build the corresponding highway system." The so-called highway, as the name suggests, is actually our current galloping road. However, I envision a road that is hardened enough to carry heavy vehicles, which involves...... Oh, there are too many, this is not the theme of the day, you can imagine it as a network of gallops that are all paved with stones throughout the country. Or what I just said, relying on traditional manpower, it is impossible to realize the national road paving stones, the amount of work is too large, but, with these large machinery, moving mountains and stones, it is easy, and the stone pavement is also feasible, and then involving my "economic science", this is a kind of "productivity" beyond a quantitative level of fundamental improvement, a new era, a Ming future. ”

Whether they understood or not, everyone nodded again.

Lao Zhu, who was inexplicably high-spirited in his heart, also opened his mouth to advise: "Yuan'er, what did you say today...... After that, it was also sorted out and written to me, and I had to think about it carefully. ”

Zhu Yuan hurriedly agreed, and seeing that everyone had no problem, he continued to explain: "The second, the excavator, as the name suggests, is used to dig earthwork. You can still imagine, or expand this machine to the size of the house, just the bucket of the excavator, a bucket to dig out 500 pounds of soil is not a problem, this 500 pounds of soil, if a person to dig, afraid that it will take half a day, this machine, may just be everyone's 'breath', 'a breath' time, not only to dig out the soil, but also to send to the corresponding location. Compared with manual work, the efficiency improvement is still 100 times. ”

Hearing Zhu Yuan say this, Lao Zhu couldn't hold back, stepped forward to pick up the excavator model, gently toggled the flexible mechanical arm, and exclaimed: "If this thing is made, digging the river and dredging it will be a sharp weapon." ”

As he spoke, he also remembered the Jianghuai Canal that was being planned.

It's a pity that it will definitely not be able to be used this time, and it will consume tens of thousands of labor.

Zhu Yuan smiled and said: "It is indeed very useful, but, ancestor, if you just dig the river to clear the dredging, you can design more targeted and efficient construction machinery in the future, for example, the silt at the bottom of the river, we can use the pumping equipment similar to just now to directly pump out the silt." ”

Lao Zhu didn't believe it: "I have seen the pumping water, pumping the mud...... Is it possible to twitch? ”

"This is actually a simple power problem," Zhu Yuan said, and explained: "The so-called power, the ancestor can be understood as the strength level of a machine. It's like a pumping machine, just pumping water, we say that its power is equivalent to the power of 1 ordinary adult, then, if we want to pump silt, we only need to design a larger steam engine, or, multiple steam engines used together, so that its power is equivalent to the power of 10 adults, and this can be pumped. ”

Lao Zhu instantly understood, and he also had an association: "Just like that soldier, someone can open a two-stone bow, but someone can open a five-stone bow." ”

Zhu Yuan nodded: "The ancestor is wise." ”

Lao Zhu didn't bother to pay attention to the sycophants of his baby's twenty-third grandson, and turned to the excavator in front of him: "The pumping machine and the train...... It's all by 'turning', this excavator, I'm afraid it's not easy to move, right? ”

"At the beginning, I thought it was not easy to build a steam engine at the moment," Zhu Yuan said that only he and Lao Zhu could understand: "However, a few days ago, I saw that the crystal palace was carved and leaked, and my ancestors still remember, the structure is exquisite and cumbersome, I think it is far beyond these in our hands, so it is firm, as long as the current craftsmen understand the principle and find the direction, to build a steam engine, and even other applications at a deeper level, it is not a problem." ”

Lao Zhu also remembered the special leak that he sent to his baby twenty-third grandson after watching it, pondered for a while, and nodded: "It's true, I think things are difficult." ”

Waiting for Lao Zhu to put down the excavator model, and glared at the second son beside him, Zhu Yuan then explained the subsequent cranes and rollers, ended the explanation of the four models, thought about it, and did not say anything about the helicopter.

There is enough limelight today, there is no need to have too much.

Moreover, Zhu Yuan pondered it in the past two days and found that he seemed to have made a mistake in the direction.

Helicopter......

The corresponding technology is much more difficult than other jet or propeller aircraft, so that in the past, many national fighter jets have developed to many generations and generations, but the technology of helicopters cannot break through.

Perhaps, it is time to start with propeller planes.

After finishing the lecture here, Zhu Yuan guided everyone to the lakeside, and while unveiling another demonstration board, he signaled to the craftsmen on the boat in the lake to put down the model.

Another blockbuster of the day.

The craftsmen who had been prepared for a long time quickly placed a total of six mini-steam boats in the lake and began to smoke slowly.

There are six miniature steam-engine ships, all about a foot in length, and there are cargo ships, passenger ships, and military ships in terms of use. In terms of structure, there are steamers, and there are paddle boats. It's a huge paddle wheel mounted on the side, and a propeller blade mounted on the bottom where it is invisible.

In addition to the boats cruising in the lake, there are also six corresponding models on the long table on the demo board here.

After everyone appreciated for a while, Zhu Yuan began to explain: "Steam engine ship, this is a means of transportation that I think is faster and earlier than the steam train, let's take a look at this schematic diagram first, heh, the content of it, the ancestor and His Royal Highness the Crown Prince have already known, here for you to do a simple popularization." ”

Looking at the world map and many text annotations on the presentation board, Lao Zhu listened with a smile, but the crown prince Zhu Biao on the side frowned slightly again.

Zhu Biao still thinks that Zhu Yuan should not talk nonsense about these knowledge.

It's a pity that Zhu Yuan didn't notice Zhu Biao's small action, otherwise he would definitely wake up, and he didn't forget the 'Hongwu Survival Guide No. 3' he realized at the beginning.

Prince first.

Lao Zhu has already done it, and the biggest hurdle in the Hongwu Dynasty is the crown prince.

At the moment, Zhu Yuan quickly combed through the previous preparations, and said: "This is a map of the world after the globe is flattened, it is not difficult for everyone to find that the ocean area occupies a large part, here, I can give a more accurate number, seventy percent, the surface of the earth, the area of the ocean occupies seventy percent, and the remaining only three percent is the land, and the land such as the extreme south, which is frozen all year round, is not much different from the ocean, therefore, the land area that we humans can use is actually less."

After a brief pause in the customary practice, no one asked, and Zhu Yuan continued: "I originally proposed that my ancestors set up the Camp Sea Division, just to open up the ocean, and the sea fishing and transportation that have been completed so far are only the most basic applications. The actual marine resources are far more abundant than we imagined, here, with a statement that I once mentioned to my ancestors, the sea is a field, and compared with our land, which is only a few shallow feet suitable for crop growth, the average depth of the global ocean is hundreds of zhang level, and the deepest depth is more than 3,000 zhang. In such a three-dimensional space, there are living beings on each floor, or fish, or shrimp, or shellfish, and algae such as kelp, seaweed, etc., which can be eaten by humans, and so on. Extending further, there are many minerals in the seabed area, such as gold, silver, copper, iron, zinc, tin, and the vastness of the ocean, which can be found on land, will only be more in the ocean. Back to just now, another advantage of the sea is that it does not need to be taken care of, and the harvest is guaranteed in drought and flood. Ploughing the fields should be planted in spring and harvested in autumn, and there is no leisure in all seasons, but for the ocean, what we have to do is only one word: harvest! ”

Clicking on the big word 'receiving' specially marked on the demonstration board, Zhu Yuan turned to everyone: "So, how to 'receive', I think you all have an answer, yes, it's 'boat'." However, the traditional sailing and paddle boats, which were too primitive, especially dependent on the wind, prevented people on land from truly taking advantage of the bounty of the sea for thousands of years. Therefore, to achieve the real 'harvest', what we need is right in front of us! ”