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The next day, Mao Geng was still asleep, and Wang Qinqin shouted outside the study:

"Mao--- Mr. Mao, haven't you gotten up yet! Hey, get up, open the door, Qin Yin and I have good news for you. ”

Mao Geng was in a daze, only heard the second half, and heard that Qin Yin was also coming, so he beat his spirits and got up in a hurry.

Now Wang Qinyin and Wang Qinqin have also established a teacher-student relationship, which is ultimately the result of Wang Qinqin's troubles who love to mess around. Things have to start with Tan Wangdi worshipping Mao Geng as a teacher, after Mao Geng returned to Baixi, Tan Wangdi naturally came to Baixi to continue to practice. Wang Qinqin saw that Mao Geng actually accepted Tan Wangdi as a female disciple, since people can be Mao Geng's female disciple, in Wang Qinqin's eyes, they seem to have taken a big advantage, Wang Qinqin immediately pestered Mao Geng and said that he would also be Mao Geng's female disciple.

When I got to Mr. Wang, I thought that my father would never accept this somewhat ridiculous request, but Mr. Wang and Mr. Wang Er's brothers put it together, and it was a bit unexpected, not only agreed to Wang Qinqin's request, but also asked Wang Qinyin to worship Mao Geng as a teacher together. This made Mao Geng a little dilemma, Mao Geng knew that although the Wang family was high, but seeing that the Su, Fu, and Dun families who cooperated with Mao Geng had skyrocketed in wealth because of themselves, the Wang family, as the person closest to him, would never have any ideas! Naturally, I want a piece of the pie too.

Just because Wang Yunzhi wants to test his fame, he can't follow Mao Geng to learn the door that has nothing to do with the imperial examination, but the Wang family is a daughter except for Wang Yunzhi, and it just so happens that Wang Qinqin is making such a fuss, the two parents of the Wang family feel that since Mao Geng has married Ling'er, and there is a precedent for Tan Wangdi to be Mao Geng's female disciple, it is better to let Wang Qinyin and Wang Qinqin worship Mao Geng as a teacher together, and the two sisters also have a companion, and the two sisters are together, so as not to let others talk nonsense. If it weren't for Wang Qinyan who promised Kang Renpei, the eldest grandson of Kang Lao, maybe the three sisters would now have to learn from Mao Geng.

Mao Geng had a good impression of Wang Qinyin that day, and it was precisely because of this good impression that he spent his lips and tongue to persuade the Wang family to come to Xinhua together, in fact, Mao Geng felt that compared to the Su, Fu, and Dun families, at least psychologically closer to the Wang family, and sometimes even felt that he owed something to the Wang family, and always felt that he should repay the Wang family. For Wang Qinyin, although after meeting Su Zhiyan, he knew that he only had an appreciation and pity for Wang Qinyin, but he was always willing to do something for Wang Qinyin.

If you want to be a formal disciple of Mao Geng, you have to perform a formal apprenticeship ceremony, and Mao Geng certainly doesn't want the two sisters of the Wang family to have a master-apprentice relationship with himself. One is that she disdains to accept Qinqin as a disciple, this kind of unruly girl can only break her own rules when she is her own disciple; The second is that he doesn't want Qin Yin to live under strict rules. In this way, Mao Geng discussed with the second elder of the Wang family and promised to teach the second daughter some practical skills, but he had to change the name, called counseling, and was not commensurate with master and apprentice.

Mao Geng never meant to treat Qin Yin as a disciple in his mind, and the second elder of the Wang family actually didn't care whether he was commensurate with master and apprentice, the key was that Wang Qinqin and Wang Qinyin could participate in Mao Geng's livelihood. In fact, Mao Geng treats them as sisters, but they can't recognize their sisters or the like, so the sisters of the Wang family are very special, not disciples but like brothers and sisters, the sisters actually look at Mao Geng like this, especially Wang Qinqin, who has always been reluctant to call Mao Geng "Mr.", but Mao Geng's knowledge is really unfathomable, and Wang Qinqin is willing to call Mr. Mao.

Mao Geng doesn't look down on Wang Qinqin, anyway, he doesn't think of himself as a teacher, Wang Qinqin is willing to learn, so he does his duty as a counselor, if he doesn't care, Mao Geng doesn't bother to care about her. However, Wang Qinyin is very studious, but it made Mao Geng think a lot about tutoring.

Mao Geng felt that Wang Qinyin had a good talent, so he decided to let the Wang sisters participate in the trial production of the clock, now called the clock, and the future of the watch business.

On the one hand, the profit prospects on this are very impressive, and the choice of Wang family cooperation can be described as peace of mind, on the other hand, the knowledge on this is enough for the two sisters to ponder.

In fact, after the escapement was completed, Mao Geng only matched the clock minutes according to the rough estimate of the number of teeth ratio, and it was inevitable that the rough estimate of the number of teeth would have a large error in the number of teeth, so Mao Geng taught the sisters to measure the error between the 24-hour duration and the clock through the guò sunlight shadow together, and taught the Wang sisters how to correct the tooth ratio, and the sisters participated in the first correction of the tooth ratio.

Today's 24-hour clocks have an error of about 9 to 16 minutes, which is a fairly accurate timekeeping device in this era. Mao Geng just explained that he still needed to continue to adjust the gear ratio, but after all, this matter was not as anxious as other things, and it was still in the stage of verifying the reliability of the escapement, so Mao Geng temporarily put the matter down, and did not ask the sisters to hurry up and calculate the new gear ratio.

Could it be that the Wang sisters have calculated a new tooth ratio! With Mao Geng's understanding of the two sisters, if it is really calculated, this must also be the credit of Wang Qinyin.

Mao Geng was hurriedly dressing up, and the bell outside greeted him enthusiastically:

"Oh, it's the two sisters who are here, my Mr. Mao stayed up all night last night, I'm afraid I won't be able to get up at this time, why don't you go to the hall and sit down first, Acui, hurry, hurry up and serve tea."

Wang Qinqin teased:

"Hehe, some people rely on some dirty means to get close to Mr. Mao, hehe, I keep saying my Mr. Mao at this time, but I am a little ashamed to hear it!"

Wang Qinyin hurriedly pulled Wang Qinqin on the side and signaled Wang Qinqin not to be too troublesome. When Ling'er heard this, she didn't get angry, but still laughed and said:

"You are a student tutored by Mr. Mao, just treat me, you have to respect Mr., you see Mr. Mao hasn't slept all night, you come early in the morning to wake him up, you can't disturb Mr. like this when you are a student."

Mao Geng got dressed haphazardly, opened the door, and greeted:

"I'm up, come in."

When Mao Geng said this, Ling'er was very useless in her heart, but she only pretended to be fine, and still asked Acui to serve Mao Geng to freshen up.

When the two sisters entered the door, Qin Yin looked at the scattered appearance of the grass, and said embarrassedly:

"So early! Excuse me, sir--- you. ”

Mao Geng said apologetically:

"It's not in the way, I should have gotten up early to practice, but I forgot about it as soon as I stayed up late, remember to remind me to get up early to practice in the future."

The maid came in with water early, served Mao Geng to wash, and was about to comb Mao's hair into a bun, and then put on a headscarf, Mao Geng waved his hand and let the maid go down. The Song people spent a little bit of effort on this, and it was much easier to take care of it in later generations, but it was not easy to do shocking things for a while, so Mao Geng's head has always been known for being unkempt. Originally, it should be better to have a maid, but Mao didn't like others to fiddle with her head, even if it was Ling'er, Mao Geng didn't let her fiddle with her head. Mao Geng has had a mustard in his heart for Ling'er, most of these days he sleeps in the study, and he will only have sex with Ling'er once in three days or four days, and he only treats Ling'er as a sexual partner, Mao Geng thought, the Song people treat concubines in the same way.

Mao Geng was in a mess, but when he saw Wang Qinyin's head turned into a lovely style, showing a lady's style, there was an indescribable sense of beauty, and he suddenly felt that if he wanted to be a big Song person, he had to have the style of this era, and the Song people's style of dress had its own charm. Let's start to immerse yourself in it today, Mao Geng thought. When I think about it this way, I feel that all the styles of this era are particularly pleasing to the eye.

I laughed at myself in my heart, I came to this era, and I didn't want the women of the Song Dynasty to wear suspenders and crop tops. The feeling of the Song Dynasty women's clothes fluttering is applauded!

There is a Qin Yin in front of him, dressed quite decently, Qin Yin is a rare woman in this era who is smart and beautiful, and it is even more rare and very hard-working, I don't know what to figure out, Mao Geng asked about Qin Yin, what good news did it bring.

Qin Yindao:

"Actually, it's nothing, it's just a new tooth ratio, if you use this new gear ratio, the timing error won't take five minutes."

"Oh. yes, that's fast! So much better! In fact, the ratio of teeth is not a problem, but for Qin Yin, Mao Geng always adheres to the principle of encouragement.

"Also, I have an idea about that scale, you see, can this be done in this picture?"

Wang Qinyin was able to come up with this topic, but Mao Geng didn't expect that Wang Qinyin also brought the graphics he painted. Mao Geng was very happy, so he asked Wang Qinyin to explain her plan.

Wang Qinyin spread the crooked picture he drew on the table, and then compared the graphic numbers to Mao Geng little by little to tell Mao Geng his thoughts. Wang Qinyin's plan is a four-level reduction plan, preceded by two one-to-six reductions, and a 2o:12o tooth ratio; The third level is a 1:2 reduction of 3O:6O, and the fourth level is a 1:5 reduction of 2O:1OO. The four-stage reduction is just a reduction ratio of 1:36o, and the output shaft only rotates one degree after one rotation of the active rotation.

Mao Gengxin said that this design can basically achieve indexing, and the indexing head that he accidentally mentioned is nothing more than the need for milling teeth, of course, there is also the need to mark the circle with a 36o degree scale. Let's talk about milling teeth, at present, milling 18o teeth is considered the limit, and milling one tooth in two turns is accurate enough. The function of the indexing head is to achieve accurate indexing with a rough movement, and this function can be achieved by subtracting a large proportion.

Mao Geng felt that Wang Qinyin's expression had already met his expectations, so he praised

"Yes, the indexing head is to constantly subdivide the circle, get a scale of 360 degrees, turn a circle to get a degree of scale, according to this principle, the index can be more accurate, for example, you can also divide a degree into ten equal parts, but that requires a reduction ratio of 1:36oo, at present, your reduction ratio is enough to meet the accuracy of the index."

At the beginning, Mao Geng used geometric drawing to divide the circumference into eighteen equal parts, then fifty-four equal parts, and one hundred and eight equal parts, which of course was only a rough approximate equal division, but such accuracy was enough for timekeeping.

However, it is necessary to further pursue the accuracy of the division, Mao Geng needs to mill the gears in large quantities, and even use the upper gear shaping, through the guò gear shaping to obtain an accurate involute profile, which requires accurate indexing as the basis. After machining a batch of approximately accurate gears, these gears are used to ensure proper transmission accuracy, so that the accuracy of gear shaping can be guaranteed.

Wang Qinyin's 2O and 12O teeth can certainly meet the requirements, but in order to simplify the processing technology, Mao Geng adjusted the number of teeth, for example, the gears of 2O teeth should be changed to 18 teeth, and the 12O teeth should be changed to 1O8 teeth.

Qin Yin was encouraged, excited, Mao Geng was busy making pulleys at this time, and he couldn't take care of the design of the indexing head for a while, Wang Qinyin's plan could be adopted, but it had to be structurally designed to become an actually controllable indexing head, and the final indexing head should at least be convenient for the indexing operation. Now Mao Geng's whole mind is on the water shipping renovation project, and the matter of dividing the head has to be put aside for the time being, Mao Geng suddenly remembered that the lifebuoy was not settled, so he said to Wang Qinqin:

"Wang Qinqin, you want to find a way to tie two or three or four bamboo tubes with straps to make them the kind that can be worn on the body, which can be worn at any time, and it is easy to untie them, and when you put them on, you must be able to ensure enough buoyancy so that people will not sink into the water, and don't let the bamboo tubes hurt people when they fall into the water. This is for the purpose of drowning into the water to save lives, and it is also a matter of importance. After all, this is going to use female red, I thought you might be able to try, do you think you can do this well? ”

Wang Qinyin's female celebrity is actually a mess, but this bamboo tube lifebuoy is nothing more than the thickest female celebrity job, Mao Geng thinks that this will not stump her.

As soon as Wang Qinqin heard that this matter was simple, she said in her heart that her opportunity to express herself had come, and she said with a big bag at the moment:

"Leave this matter to me, and you can do it well."

Wang Qinqin led the messenger and went with Wang Qinyin in a hurry.

Mao Geng ate casually, and then rushed to Li Song's blacksmith shop. Li Song, Huang Wangcai, Qu Deer and Fan Biaoyong have all gathered in Li Song's blacksmith shop, waiting for Mao Geng's drawings to build what Mao Geng said about the pulley, and what the pulley is, the four of them don't know anything.