"Su Hao, did you take this cement with you before, and the old man wants to see it with his own eyes?" Pan Jitao asked.

"I'm about to present it to Pan Gong." Su Hao said, "This cement, as well as some other things, have been brought by the lower officials, just outside the door, and they are under the care of the lower officials' colleagues, please allow them to come in." ”

"Invite Su's colleagues to come in." Pan Jitao did not hesitate to instruct the soap on the side.

Soap Li went out, and after a while, he came in with Ma Yu, Jiang Yida, and Tan Qi. Su Hao introduced the three of them to Pan Jitao, and the three of them bowed to Pan Jitao in fear, and Pan Jitao returned the salute and arranged for them to sit down on the side.

"Pan Gong, please see, this is the cement before the modulation, and this is the cement after solidification." Su Hao took the sample of cement from Ma Yu and presented it to Pan Jitao's public case.

Xiong Enzheng got Pan Jitao's permission, and also came forward to observe the small bag of cement powder and a small cement brick with Pan Jitao. Xiong Enzheng tapped the cement brick with the knife on Pan Jitao's case, felt its hardness, and then pointed to the cement powder and asked, "Master Su, do you mean that this stone is made of this powder?"

"Exactly." Su Hao said, "If you don't believe in Xiong's experience, you can try it yourself." ”

"I'm going to see it." Xiong Enzheng said.

Under Su Hao's guidance, Xiong Enzheng personally prepared a small ball of concrete mortar and made it into a boxy sample. Su Hao asked the soap in the hall to take out the sample and expose it to the sun to make it solidify as soon as possible. However, he also explained to Pan Jitao and Xiong Enzheng that the effect of natural cooling and solidification of concrete is better. It's just that the time drags on for a long time.

"Where did Su get this kind of cement? This material is also very beneficial for the construction of river works. While waiting for the concrete sample to solidify, Pan Jitao asked Su Hao.

Su Hao said: "This thing was invented by Xia Guan, and its formula is not complicated. However, a special ball mill needs to be used in the processing process, which is somewhat troublesome, so the output is limited and the price is relatively high. ”

"Are you saying that in the entire Ming Dynasty, only you can make this thing?" Pan Jitao asked.

Su Hao nodded and said, "You can say that."

"Hmm. If this thing is really as magical as you say, and the price is reasonable, it can be used in the river project, and the general river yamen will purchase it from you. Pan Jitao said bluntly. He is not interested in snatching Su Hao's patent rights, nor does he want to make this cement fortune with Su Hao, in his opinion. It is enough to be able to get cement for the construction of the river. As for spending some money, isn't that the right thing to do?

"Xie Pangong." Su Hao hurriedly thanked him. Cement is an essential material for the project, and he has long wanted to build a cement plant in Huai'an to provide cement for river projects. There are coal mines in nearby Xuzhou, limestone can be found everywhere, and there are no barriers to building a cement plant. As an engineering material that is ahead of its time. The sales price is two or three times higher than the cost, which is also acceptable in the eyes of users, and Su Hao believes that he can make a profit of tens of thousands of taels of silver from cement.

"The Ministry of Industry sent you to Huai'an to govern the river because you invented this cement?" Pan Jitao asked. He is really interested in Su Hao now, even if Su Hao has no strengths in other aspects, just being able to invent such a magical cement, it is not too much to be a river master.

Su Hao said: "Of course not, in fact, cement is just one of the objects invented by Xiaguan." Xiaguan is best at this. ”

Speaking of which, he took a scroll from Jiang Yida's hand and presented it to Pan Jitao's case again. Pan Jitao took the scroll and slowly unfolded it. It was found that the scroll was made of white silk, and it was densely embroidered with lines, red, green, and green, and there were some small characters as thin as mosquitoes and flies next to the lines.

"What is this? ...... above this Is it written in words?" Pan Jitao desperately opened his eyes wide, but he still couldn't see what was written on them.

"Pan Gong is old, so he must have poor eyesight, right? Pan Gong, please try this, it may be useful. Su Hao quickly handed Pan Jitao a pair of reading glasses, and put a huge magnifying glass on the picture.

Under Su Hao's guidance, Pan Jitao put on reading glasses, only to feel that some blurry objects in front of him suddenly became clear. He looked at Su Hao with a surprised gaze, Su Hao had already expected Pan Jitao's reaction, he smiled slightly, pointed to the magnifying glass with his finger, and signaled that Pan Jitao could look at the picture now.

Pan Jitao picked up a magnifying glass and looked at the white silk, this time, the lines and words on the white silk were clearly legible. I saw that those words were written with the names of places that he was familiar with, combined with these place names, and then looking at those lines, he slowly understood that this was clearly a map around the river.

"What do you mean by these lines?" Pan Jitao asked.

"Contours." Su Hao said, "We take the surface of the canal as the base point, this line means 5 feet high, this line is 10 feet, this line is 15 feet......

While listening to Su Hao's explanation, Pan Jitao took a magnifying glass to inspect along the river, and after just one sniff, he showed surprise on his face, and shouted: "Great!" This picture should only be in the sky. Su Hao, who created this cartography?"

Su Hao smiled: "It was created by the lower officials."

"When did you create this method?" Pan Jitao asked again.

Su Hao said: "This is when the lower official was in Jiangxi, he learned from the method of the Francophone and figured it out by himself." After Wang Shangshu of the military department learned about this, he instructed the officials to build a survey battalion to specialize in the surveying and mapping of contour maps. When Xia Guan went to Banzhou at the beginning of the year, he was assigned by the Ministry of War to survey and map the entire territory of Banzhou. ”

"You mean, Wang Yiyu already knew about this method?" Pan Jitao asked, his qualifications were higher than Wang Yiyu's, so he was able to call him by his first name.

Su Hao said: "Yes, Wang Shangshu knew this method from the beginning."

"This Wang Yiyu is simply a sinner for the ages!" Pan Jitao slapped the case angrily and scolded loudly.

Su Hao was startled, and hurriedly asked, "Why did Pan Gong say this?"

Pan Ji tamed: "Wang Yiyu knew this method, but he never mentioned it to the old man. This mapping method is very useful for river control, and the terrain is undulating, which directly affects the trend of the river. If the old man had this picture earlier, how many detours could he have taken! Su Hao, tell me, is this Wang Yiyu a sinner through the ages?"

"Uh...... Well, it's not good for the lower officials to comment. "Su Hao was defeated and retreated, even if he evaluated a military department secretary like this.

Pan Jitao scolded Wang Yiju, but he was only indignant for a while, in fact, he also knew in his heart that Wang Yiju had no obligation to recommend this method to him, and he himself didn't inquire about the latest scientific and technological progress of the Ming Dynasty, so how could he complain that others would keep it secret from him? He pointed to the map and said to Su Hao: "Su Hao, this map, you should have given it to the old man, right?"

Su Hao nodded and said, "Yes, this picture is dedicated to Pan Gong." However, this map is only a rough map of the Huai'an section of the river, and if it is used to guide the construction of the project, a more detailed map is needed. ”

"You're right." Pan Ji said, "Su Hao, after you go back, quickly arrange someone to make a more detailed drawing, and the old man will wait to use it." ”

Su Hao said: "Pan Gong, this map is not something that can be made casually, to make a map, you first need to arrange someone to carry out surveying and mapping." This map for you is the result of more than half a month of surveying and mapping by nearly 100 people in my survey camp. If I wanted to make a more detailed drawing, I would have to add more people and more time. ”

"The manpower is there." Pan Ji said, "There are more than 10,000 soldiers in the River General Soldier's Mansion, which is really not enough, I can also transfer the soldiers in the Trough Transportation General Soldier's Mansion to you, how many men and horses do you need in total?"

"Pan Gong, I don't need many people, a few hundred people are enough. However, the person I want must be literate, and I must know some basic arithmetic, and I must be in good health, have a good character, and obey orders......" Su Hao snapped his fingers and opened the conditions for Pan Jitao.

"I don't care about these, who you want to use, just choose for yourself. By the way, if you want to read people, some of the servants on the river workers are also from Xiucai, and it seems that there are even people from Juren, and I will ask them to find out for you to choose, how about it?" Pan Jitao said generously.

The cement that Su Hao offered before had a certain attraction to Pan Jitao, but Pan Jitao did not directly do engineering after all, so he did not feel the role of cement strongly enough. Maps are different, Pan Jitao has to deal with maps almost every day, so he knows the value of a good map.

The map that Pan Jitao used before was that traditional schematic map. That kind of map only uses some thick lines to mark where there are rivers and mountains, which can neither reflect the real elevation, nor is it drawn according to the objective scale, and the distance cannot be seen from the map at all.

The map presented by Su Hao is different, the location of each location is marked in strict accordance with the proportional relationship, and the real distance on the ground can be calculated by measuring it with your finger on the map. The contour line is even more magical, it is obviously a flat map, but it can make people see the ups and downs of the terrain. With such a map, it is clear where the embankment needs to be built and how high, which can greatly reduce the difficulty of management and save design costs.

It was precisely because he saw the superiority of this kind of map that Pan Jitao was eager to ask Su Hao to hurry up and make a more detailed map, and was willing to open all the green lights for it.

"Pan Gong is a little restless, the survey technique is not something that can be learned at once, and it will take a long time for the lower officials to recruit the right people, and it will take a long time to train them. Therefore, it may take several months to complete the mapping of Huai'an Province and surrounding prefectures and counties. Su Hao patiently explained.

Pan Jitao nodded and said, "I know." Su Hao, now I understand why Wang Cifu sent you to control the river, you do have extraordinary skills, and it is not in vain that Wang Cifu recommended you to a six-grade position. In this way, you first slowly familiarize yourself with the things on the river, and let your people hurry up and do the mapping. If there is any problem, you can raise it with the Governor, and the Governor will try to solve it for you. As for the strategy of river control, after you have thought it clearly, we will discuss it again. You're right, it's always up to you young people to do the work of controlling the river. (To be continued.) You are welcome to come to the starting point to vote for recommendation votes and monthly passes. For mobile phone users, please go to read