Daqin: When I return from sea, I will offer you a map of the world

Chapter 32 Get the Arabic numerals out!
Ji Cheng wanted to find out about his brother's situation, but the Lantian camp was a military camp, so he couldn't get close.

Ji Cheng is just a small change, and his position is only a pavilion chief, how can he easily enter the Lantian camp?

The grandfather and grandson discussed for a long time before finally paying attention.

Ji Chang is an old soldier who conquered Chu, and experienced Li Xin conquering Chu and Wang Jian conquering Chu successively.

Ji Chang served in Wang Jian's army because of his outstanding personal ability.

And in the forest, there are many veterans of Chu Chu like Ji Chang.

Some of them even drove for Chehou Wangjian.Hmm... Although he is the co-pilot, he can barely be considered a personal soldier.

"I used to serve in the Chehou camp. Sheng, Sun, and the two used to drive for Chehou. The eldest father went to ask to see if he could meet..." Ji Chang said with a hunched body.

Sheng, Sun, and the two are lonely old people in the village.

His sons and heirs died in battle, his daughter-in-law remarried, and he couldn't bear another child. In short, only the elderly were left in the family.

It is not uncommon for them to be like this in this era. After Qin destroyed the six kingdoms, the war never stopped. The Huns were conquered in the north and Baiyue was conquered in the south.

There were wins and losses in the middle, and the pace of Daqin's expansion was paved by the soldiers.

This is the case of Sheng and Sun. The child died on the battlefield, and he was unable to reproduce, so the offspring had to be cut off.

But both of them are men of meritorious service in conquering Chu, their titles are not changed until the fourth level, they can be exempted from corvee, and they have servants at home, so life is not too difficult.

Sheng, Sun, and the two have become eccentric since their heirs became extinct. It's just that the two of them are meritorious men, and their titles are not low in this village. They used to drive for Marquis Che. Even the villagers are hard to restrain.

"Xi Ji Sheng and Sun Po Xi Si'er, I think they will help her in the future." Ji Chang said.

Ji Si has been liked since she was a child, even lonely old people like Sheng and Sun who have weird tempers like Ji Si, and only Ji Si will have a rare smile on her face. As a picked child, Ji Si is quite a kind of Painful feeling.

When I was young, I wandered around the village and sat in that house, and sometimes I was stayed at home by others.

At the beginning, Ji Chang was knocking on doors from door to door in order to find Ji Si who was staying overnight.

Ji Chang knew that even though he had served under Chehou's subordinates, he didn't know where the unstoppable incense had gone.

Similarly, a high-ranking person like Chehou may not remember Sheng and Sun who drove for him, but the relationship is always closer than himself.

After making up his mind, Ji Chang leaned on crutches and knocked on the gate of the two of them next to each other...

After so many years, Ji Chang still feels guilty.

Although Ji Si is a picked child, why doesn't he love him?How could he not be treated as his own grandson?
No matter what it is in the family, he is a bowl of water, and it is really difficult for him to be fair until the matter of enlisting.

……

On the other side, in the Lantian camp, Wang Li begged to see his father Wang Ben, told about Zhao Si's salt production, and told his father Wang Jian that he wanted to play the first emperor urgently.

Although Wang Ben was dissatisfied with Wang Li, he didn't dare to neglect his father Wang Jian's words. Without any hesitation, he wrote a quick note and selected soldiers to pass it on.

As for Zhao Si... he squatted down and messed with a group of craftsmen.

The first to come out was the vernier caliper.

Thanks to the unification of weights and measures by the first emperor, all parts of the country are now unified in accordance with the weights and measures of the Qin State, so weights and measures such as vernier calipers can be used throughout the country.

The length conversion of the Qin Dynasty is also in decimal.

One zhang equals ten feet.

One foot equals ten inches.

One inch equals ten.

In the Qin Dynasty, one chi was approximately equal to 23.1 centimeters.

The smallest unit on the vernier caliper is a minute, that is, the highest accuracy can reach 0.231 cm.

The accuracy of about two millimeters cannot be achieved any lower, because it is difficult to be more accurate with today's measuring tools.

Because the iron and steel smelting technology in this era is too backward, the first vernier caliper in Zhao Si's hand in the Qin Dynasty was made of bronze.

Skillfully pushed away the vernier caliper, made a wooden block to clamp the measurement, and explained the principle and counting method to the craftsmen while measuring.

……

As a result, Zhao Si was again baffled by the mathematical expressions of this era.

It's not that there is no mathematics in this era.

In fact, there were already multiplication tables in the Spring and Autumn Period and the Warring States Period.

And thanks to the fact that part of the Mo family settled in Daqin, the military craftsmen of the Qin Dynasty were actually quite good.

Especially the military craftsmen of Lantian Daying, which is the gateway of Xianyang.

Basically, they all have a rough understanding of some mathematical calculations, and the popularity of multiplication tables is not low. The problem is that the expression and operation of numbers, especially decimals, is too troublesome.When it comes to weights and measures, Zhao Si's brains are all overwhelmed by the conversion.

Zhao Si misses the modern Arabic numerals a bit.Arabic numerals are really easy to use, this is an indisputable fact.

Zhao Si simply chose to put it badly, and let the craftsmen study the vernier calipers by themselves, while Zhao Si himself planned to figure out the Arabic numerals and various formulas.

Zhao Si's mathematics level is not high, that is, the mathematics level of a high school graduate.

I don't know anything about calculus and high numbers.

Seriously speaking, after the third year of high school, Zhao Si's mathematics level dropped rapidly, and by the time he left school and entered the society, he had almost forgotten about it.

In my previous life, I even sometimes had to be stunned for a while when I saw the questions of elementary school students.

But in this era of per capita addition, subtraction, multiplication and division, Zhao Si can be regarded as a master of arithmetic.

"I can't think of it, I can't think of it..."

Zhao Si wrote a simplified version of [-] on the ground.

"What are you writing?" A voice came from behind, and Zhao Si knew it was Wang Li without turning his head.

"Numbers, one, two, three, four..." Zhao Si explained.

"Where did this come from [-]? Did you see it overseas?" Wang Li had never seen this [-] like a ghostly talisman.

"Okay, I've learned to answer quickly!" Zhao Si smiled.

Because Zhao Si didn't have the cheek to say that things were invented by himself, and he didn't bother to explain. Faced with Wang Li's inquisitive questions, Zhao Si would usually shirk and go overseas.

Ask me how?I learned it while traveling the world.

So much to deal with, Wang Li learned to answer quickly.

"What good is this number?" Wang Li sat cross-legged on the side.

The two are already considered friends, and they get along more casually, so Wang Li doesn't need to maintain a kneeling upright posture, as long as the legs are not spread apart and the door is wide open, it doesn't matter.

Wang Li looked curiously at the ghostly talisman written on the ground by Zhao Si.

Having experienced salt, Quyuanli, etc... Wang Li already knew that Zhao Si usually squatted on the ground like this, and he probably had something good.

"Easy to use!" Zhao Si smiled and looked at the Arabic numerals on the ground.

Getting Arabic numerals, fractions, decimals, functions, equations, and all kinds of formulas should be able to revolutionize ancient mathematics.

Of course, there is another crucial question.

This thing... he is easy to learn!
(Checked, Master Reader, help me to catch the bug again.)
(End of this chapter)