"Arithmetic is indispensable in the whole world, between public and private."

"Arithmetic has degrees, squares, and geometry. Xu Gongguang's pen was influenced by the "Geometric Original", which made our country and our people accustomed to it, such as measuring acres of land, building bridges, and operating artillery, all of which can benefit a lot. Today, we will begin to study the first volume of the Geometric Primitives, which deals with triangles and has a total of 48 questions. ”

On this day, Gu Shouqian came to send pen, ink, paper and inkstone to Shoukuan School on behalf of Miao Atai, and passed by the classroom, where Mr. was teaching arithmetic.

He stood and listened for a while, and when he turned around, he saw Wang Yuesheng and Zhang Dai coming side by side.

Zhang Dai bowed his hand and asked, "The traveling immortals also like geometry in arithmetic?" ”

Gu Shouqian said: "Originally, I was not very interested, because I was ordered by Master Sun to draw some French drawings of guns and guns, and I realized that the guns should be measured with guns, otherwise the iron bullets will lose their accuracy." And this method is related to geometry, so let's listen to it. ”

Wang Yuesheng added with a smile: "Gu Gongzi's brushwork is amazing, and he can simplify the complex, and the French drawings he draws are not only gunners who have learned geometry, but also me and the craftsmen, and can understand seven or eight points." ”

Wang Yuesheng's praise was by no means out of greetings.

At the beginning of the year, after Zheng Haizhu went to Chongming to reclaim the wasteland, Miao Ruiyun told Wang Yuesheng to make the casting and operation of firearms into words and graphics as soon as possible, and form a booklet like the French style of the Ministry of Industry, and handed it over to Liu Shimin in the north and Zheng Yi in the south.

Wang Yuesheng turned his mind and proposed, Gu Gongzi, the grandson of Ah Tai, is a ready-made master of writing and painting, and Chana Sun Yuanhua was also assigned by his teacher Xu Guangqi to smelt and operate artillery, like "Geometric Original". If Gu Shou is allowed to sneak into the artillery factory and assist Sun Yuan to write a book, it will not arouse suspicion, it is better than himself, a woman who is in charge of people and money, wandering between the workshops of the field.

Now that two months have passed, Gu Shouqian's progress is really not slow, Wang Yuesheng only waited for him to complete all the manuscripts, and told Sun Yuanhua and Zheng Haizhu that the matter involved military aircraft, and he would personally publish and print it, and take the opportunity to write a few copies.

At this moment, Gu Shouqian didn't know that Miss Wang's bright smile had such a deep meaning, but he felt that although the pair of beautiful people in front of him could not stay together in the mansion openly, they were lovers and a wonderful place in the twilight of the dynasty.

I only heard Zhang Dai take the initiative to invite: "Brother Luxian, the younger brother found a few ancient cedar planks from Shanyin, would you like to go and take a look and give some advice?" ”

The wood is used for chopping the qin, the top is fir wood, and the bottom plate is catalpa wood. Gu Shouqian, a scribe and son, is good to Qin Zhiya, and he is not under Zhang and Wang, so he happily goes together.

When I arrived at the courtyard of the piano workshop, the monk Yonghai, who had stayed at Shoukuan School to teach Japanese, was happily caressing a few cedar planks.

After living in Daming for almost a year, Yonghai's Chinese dialect has advanced by leaps and bounds, and he has been able to express his praise to Zhang Dai fluently.

Gu Shou looked at the annual rings of the plank, and listened to Zhang Dai's Yonghai narration.

Although Zhang Dai is humble and peaceful, when talking about the exquisiteness of the sound transmission of the piano board, he always starts with "Mr. Wang said", obviously taking Wang Yuesheng's preferences as the top priority.

Gu Shouqian listened and listened, and a thought was stored in his heart.

When he returned to Wenzheyuan, he called the servant: "You go to the shack near Sijing Jiuliwan, find the blacksmith Du who sent me back that day, and see his shop." If it has already been opened, let him make fifty spinning shafts of kapok seeds, and then make a hundred needle blanks. ”

Gu's mother, Lu, was trimming the hibiscus on the side, turned around, and asked her son with a hint of joy in her search: "Do you want to send some farm tools to Ximeng and Miss Zheng?" ”

Gu Shouqian rarely showed a knowing smile for many days, nodded and said: "I heard Ximeng say that when ginning kapok, iron mills are better than wood mills. Miss Zheng wants to support those many homeless people, and she must be short-handed in recent years, so let's give her a few iron mills. As for the needle blank, I heard a unique secret method of stir-frying needles from Ah Tai, and I wanted to try it. ”

Gu Shouqian's "fried needle" is a necessary part of the production of embroidery needles.

After the wire is cut and the eye of the needle is chiseled, it is fried in a pot over low heat, and then steamed with pine sawdust mixed with fine soil. The heat and materials of frying and steaming in different embroidery workshops are different, and they all follow the habit of pinching and applying needles to their own embroiderers.

Mother Lu heard that her son was going to fry needles for her daughter-in-law in person, and her face was full of longing, she couldn't help but be happy, and echoed slowly: "Ximeng is the most picky about needles, and if you give her a set of suitable embroidery needles, she will be happy." Ah Qian, Mom feels that Xi Meng's vision of people is very accurate. The Yin family is so showy, and they all go to make friends with cats and dogs, and the few evil businessmen attracted this time are like bandits and robbers. ”

Gu Shouqian listened quietly.

The day after that attack, he went to Songjiang Mansion to sue the official, and Huang Zunsu personally went to the Shandong Chamber of Commerce to get people, and the three evil businessmen had already run away. Gu Shou was worried about the face of his teacher Dong Qichang, so he gave up, but in his heart, he thought the same as his mother, Han Ximeng was unwilling to associate with the Yin family, which now seems to be quite reasonable.

I only heard the Lu family call to stop the little guy who went to do errands, and asked Gu Shouqian: "The blacksmith who saved you, does he have a female dependent?" I gave them a few sets of clothes and handkerchiefs, and I brought them with them. ”

Gu Shouqian said: "A foreign craftsman, even if he has a good heart, he is afraid that the good and the bad are uneven among the villagers around him." Mom, my family doesn't have to move around like relatives. The son gave him some money to earn, even if he thanked him for saving him righteously. ”

Lu thought about it reasonably, so he gave up.

More than half an hour later, the little guy came back and said to Gu Shouqian: "Young master, over there is Blacksmith Du, the furnace is already burning." The little one will give him the money, and he will be overjoyed. ”

Gu Shouqian was transcribing text notes for pictures of firearms such as eagle falcons and four-pound cannons, but he didn't raise his head, and said lightly, "I know."

……

Chongming Island, Zhengjiazhuang.

Three months later, the second batch of about 50 Liao people was sent by Xu San on the cargo ship of Haoming Trading Company.

This trip was accompanied by Xu San, and there was also a young mother, Aya.

This member of the Yehe tribe, who had been abused at the hands of both the Jianzhou Jurchens and the Han Chinese, was taken in by Zheng Haizhu at the beginning, and followed her on a trip to Hetuara to participate in espionage training, as if he had been reborn.

After Aya gave birth to a child in Liaoyang, she recuperated for a year, and Wu Bangde arranged for her to go to the Yanzhou Intelligence Station to assist Mu Zaohua.

This time, Aya took the child and boarded Xu San's ship from Dengzhou, and went to Chongming Island to report the situation of the Wangfu Coal Mine to Zheng Haizhu, and handed over the dividends of the coal mine shares sent to Zheng Haizhu by His Royal Highness Zhu Yi.

Zheng Haizhu specifically asked about the pumping of water from the Yanzhou coal mine.

After all, the invention of the Jenny spinning machine and the steam engine was an action that must have been thought of by those who had traveled to the Age of Discovery.

The invention of the steam engine came from the need to pump water for coal mines.

Zheng Haizhu was not an engineer in his previous life, and he did not have the standard gold finger of the traverser, such as the system that can choose Watt to answer questions.

But it doesn't matter, this is the late Ming Dynasty, an era with scientists such as Xu Guangqi and Song Yingxing, and as long as she leads an idea, the steam engine may be like a multi-spindle spinning machine, which can be pondered and shaped by smart natives.

After listening to Aya's report on the coal mine, Zheng Haizhu looked at the hoarders on duty at the arsenal opposite, squinted and said, "Aya, you live in Zhuangzi for a few months, help me keep an eye on a hoarder and see if he has anything wrong." ”