Daqin Fusu: It is difficult to start the battle

Chapter 188

Under the north slope of Shenheyuan, there are burly soldiers holding strong crossbows and spears everywhere. From time to time, patrols holding various banners shuttle among them, completely enclosing the entire surveying and mapping site.

In front of Fusu is the youth version of the theodolite with a vernier that was just produced not long ago.

He gestured twice, and came to the conclusion that it was doable.

In the hands of the engineers who belonged to the imperial servant's mansion, they held a stack of trigonometric function tables.

Most of these Qin State engineers who majored in civil engineering have very high...

Well, it is roughly equivalent to the level of mathematics attainment of junior high school students, and also has a good grasp of the principles of surveying and mapping.

Most of them have memorized "Zhoubi Suanjing" and the first edition of "Nine Chapters of Arithmetic", which describe in detail mathematical knowledge such as fraction calculation, Pythagorean theorem, proportional algorithm, area algorithm, and quadratic equation solution in one variable.

So the trigonometric function table that Fusu handed over to them will come in handy soon.

Today, the reason why Jiangzuo Shaofu Public Transport and the eunuch Meng Tian went to the surveying and mapping line in person was because of a disagreement over the construction of a road from Xianyang to Xialing County.

According to Meng Tian's thinking, it is natural to do it in one step, build a five-step-wide (thirty feet) road, and then pave it all with cement.

As for the public transport rail, considering the insufficient production capacity of cement, it needs to be allocated first to the internal roads of Xianyang City for reconstruction. As for the road leading to Xialing County, it is enough to level the existing dirt road a little, and there is no need to spend a lot of trouble .

Fusu didn't bother to pay attention to the two bearded beards who were nagging all the way. He looked at the Xianyang City in the distance and decided to build the road according to his own ideas.

A two-foot-wide concrete road was built from Xianyang City, connected to Xialing County, and then turned to Lantian County.

As for why it is two feet wide, it is based on the weights and measures after the unification of Qin Dynasty. The width of the track is six feet, which is about the sum of the hip width of two medium-sized Qin horses.

In this way, when two carriages are paralleled at the same time, it can also leave a little space for the surrounding pedestrians.

In Rome at about the same time, although the width of the rails was slightly wider than that of Qin, it was also based on the sum of the hip widths of two horses.

The difference between the two is because the big horses have wider buttocks.

Fu Su flipped through the surveying drawings of the engineers, and suddenly thought that there is a saying in later generations that the characters for the same track of Qin State vehicles represent rail transportation, that is, 'horse-drawn trains'.

It's just that in Fusu's view, there are only two words in the whole article.

Bullshit!

According to the analysis of 'experts', 'the distance between the sleepers is just in tune with the horse's pace.Once the horses pull the cart onto the track, they will involuntarily undergo "self-excited oscillations", and they have to run very fast, and it is almost impossible to stop. '

In other words, in the minds of these 'experts', Qin's standardization has reached the point where even the height and length of a horse can be controlled!
Because the stride size of horses depends on the length of their legs, the same size of horses in the same group of carts can be the same, but thousands of horses can be similar in size, and only modern breeding technology can do it.

The so-called carriage on the same track stipulates the wheelbase between the two wheels of the carriage.

For example, a four-meter-wide dual carriageway can pass two small cars with a width of no more than two meters, but suddenly a large car with a three-meter width comes from the opposite side. You can pass by giving in to each other.

But what about mountain roads?
Is the whole road blocked?
And there is another important reason, whether it is the Qin State or the Six Kingdoms of Shandong, the main means of transportation are horse-drawn carts or ox carts.

In the era when the steering gear was not invented, vehicles could use ruts to complete the steering.

After Fusu expressed his views, Meng Tian and Gong Shugui, who were in the dispute, were stunned for a moment, and had to say yes.

Meng Tian looked at the roads and figures outlined on the paper, and asked, "Your Majesty, what do these triangles represent?"

Fusu said, "Street trees. Well, it's similar to the pine trees planted on Chidao."

He recalled those half-dead street trees, and was speechless for a while.

I don't know who gave the fat man the idea, but the street tree actually chose the pine tree!
Yes, pine trees are evergreen all year round, and they have a good meaning.

But the production of pine trees is slow. It can be said that 'grandfather planted trees and grandchildren enjoy the shade'!
As a time traveler, although Fusu is not a gardener, he also knows that pine trees are completely unsuitable for street trees.

In his opinion, an excellent street tree should first be resistant to drought, cold, and barrenness. After all, planting on both sides of the road is not the same as growing in the mountains.

Secondly, it should grow fast, with less fallen leaves and fruits.

He clearly remembered that in later generations, a street tree in a certain place chose the variety of king coconut, but when the leaves fell, a leaf fell and knocked a passerby unconscious...

And those poplar trees with poplar catkins flying all over the sky in season are not advisable.

During this period, the Qin State mainly had houses with wooden structures, and poplar catkins were extremely flammable, so this was another point to eliminate them.

Fusu thought of a kind of street tree, eucalyptus, planted in his hometown in later generations.

This kind of tree is resistant to drought and has a strong ability to adapt to the environment. Although it grows slowly at the seedling stage, it will grow faster and faster. The most important thing is that it has a strong ability to resist smoke and dust, which is very suitable for planting in industrial areas!

Moreover, eucalyptus has other benefits. Its seeds can be used to extract oil, its leaves can be used as blue dyes, and its flowers have certain medicinal value, and yellow dyes can also be extracted.

Well, the young shoots that grow in spring are also delicious, it can be said that the whole body is full of treasures!
The most important thing is that the eucalyptus is a native species in China and is widely distributed in the Central Plains.

"Han Wenjia" said: The emperor's grave is three ren high, with pine trees; half of the princes, with cypress trees; officials with eight feet, with luan trees; scholars with four feet, with locust trees; ordinary people without graves, with willow trees. "

Therefore, the eucalyptus tree of this period is also called the doctor tree.

Fusu glanced at Meng Tian, ​​and recruited Lu Ling, who was under his jurisdiction, who was mainly responsible for building the principles of the whole country: "I pass on my decree, within the next five years, I will uproot the pine trees planted on the road. Hey, all the street trees in the north of Guanzhong have been replaced with eucalyptus!"

Lu Ling Mengkang looked at his cousin, and said without confidence: "Your Majesty, this..."

I understand, it’s money, right... Fu Su smiled and said: "All the expenses will be paid by the Shaofu. When you return to Xianyang, you will send someone to contact the Shaofu to collect it in Sanchuan County, Hanoi County and other places." Tree species, and enclose a piece of land on the mountain forest there, dedicated to breeding, and strive to plant all the eucalyptus trees on both sides of the road north of Deshui within ten years!"

In this way, some jobs have been provided for the local area.

People's hearts are won bit by bit like this.

(End of this chapter)