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There's another chapter to come.

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It's raining, Yan Bi is a little glad to listen to the opinions of the locals and build a lot of mats to protect from the rain early, otherwise the construction of the wall or something will stop because of the rainy season. If the two-month deadline expires and the walls are not built, not only will his head be hung under the city gates, but in half a year, hundreds of thousands of people will die in the wilderness.

The rainy season has arrived, and many people in the past have nothing else to do except hide in the house, but this year, the Guanyu Mansion is taking advantage of this rare opportunity to recruit workers, for which Nanling City has added more than 70,000 laborers.

A large number of fortresses have been built in Nanjun, the technology of temperature baking has matured, and there are huge mats on the top of the head to cover the raindrops, and the speed of the construction of the city wall will have an impact, but it is not a big deal.

It is rainy in the south, and Nanjun is naturally part of the south, but she is not the area closest to the south, and there is a Qianzhong County further south, and the southern territory of Qianzhong County is larger, if you can plan at least three or four counties according to the standards of the Qin State.

The rainy season in the further south area is much longer and more violent than in Nanjun, and Lu Zhe has also heard that there are some visions of heaven and earth, such as strong winds, lightning and thunder, and some mysterious descriptions. Actually, it's just a storm that forms from the sea, that is, a hurricane, a typhoon, or something.

Hearing this news, Lu Zhe's worries about Baiyue were also eliminated. He had been worried that the Baiyue people would make a move, and once the Baiyue people marched in as they prepared to deal with the attacks of the Qin army and the rebels from all sides, it would really be a big trouble.

The south is different from the Central Plains, the Central Plains is not suitable for using troops in winter, and the spring, summer and autumn seasons in the south are actually not suitable for using soldiers. There is a rainy season in the south in spring, summer is the most active season for mosquitoes in the south, and in autumn there is another rainy season in the south, and there will be no other three seasons in winter. Hurricanes, typhoons, and so on don't happen every year, so winter in the south is a really good time to fight.

I asked the old people in Nanjun that the rainy season in Nanjun will last for about half a month, when the water level of the Yangtze River will rise, and the flowing water will become extremely turbulent.

Knowing this situation, Lu Zhe took advantage of the beginning of the rainy season to order the delivery of a large number of military equipment to the south bank of the Yangtze River, but there was no need for food or anything.

After transporting the military equipment, the bridge captain requested that the pontoon bridge be temporarily removed, leaving only an empty chain bridge, saying that the pontoon bridge should be demolished first because it would be washed away by the flood. Wait for the water to calm down before getting it on.

Lu Zhe, who received this request, personally went to inspect the chain bridge, and saw that the bridge was built on both sides of the strait, and the two of them could only walk side by side when the rope was pulled up and suspended in the air, so he agreed to the bridge captain's request. He asked the name of the captain of the bridge very rarely, and rewarded him with ten gold medals and promoted him to the first rank.

It would be good if there was a suspended bridge that could keep the news with Qianzhong County unblocked, but if the pontoon bridge was demolished, Nanjun would lose contact with Qianzhong County, and the head of the bridge lieutenant would be cut off at the first moment.

After inspecting the bridge, since Lu Zhe came out, he also inspected the Yuecheng in various places by the way, and the first thing to check was the Yuecheng where Mei Kai was located.

The Qin army was world-famous for its bow and arrows, and maintained the upper slabs that other walls would not have when building the walls of Nanling City. The intention is to defend against arrows.

The so-called board road is actually a kind of building similar to the roof of a gazebo, except that its equipment is not thatch, but a new thing borrowed from the idea of an apartment building, removing the plywood support and mixing cement with wooden beams. All right. It can be imagined as a large gazebo without walls, except that it is elongated.

Nanjun's Yuecheng imitation pouting crossbow has not been successful, but has derived a lot of strange crossbows, such as a kind of repeating crossbow that does not have a good range but can fire continuously. A bed crossbow called an improved type, a foot crossbow that is a few inches larger than the Puzhang crossbow but has a longer range than the Puzhang crossbow and can be used by individual soldiers, and there are many strange guys that even Lu Zhe can't understand.

There is nothing surprising about a repeating crossbow. There is nothing surprising about its construction, except that there is an extra spring at the bottom of the crossbow body, and when the arrows are loaded, they are not loaded one by one and become a box similar to a bullet clip. This kind of crossbow also has an additional device, which is from Lu Zhe's handwriting, which is actually a small twisted handle equipped with pulleys and gears, which can be quickly wound with a pull and a stretch. It's a pity that because of the material, this kind of repeating crossbow looks very advanced, but the range is only 70 steps, and the maximum killing range is within 30 steps.

In fact, the birth of every new thing can always cause a revolution in industry, such as the crane wheel that can be seen at almost every construction site, without which the people have to carry hundreds of pounds of things up and down, and some new military equipment cannot be born without springs. The appearance of the gear is a big explosion, but unfortunately the craftsmen have not figured out how to use it on a large scale, and now it is only used on a ballista and the jack gates of several city gates in Nanling City.

There is nothing unusual about ballistas, as early as 399 BC, the Greeks have made them, the ballistas of Nanjun have gears and chutes, and the ballistas of the Greeks can hit 26 kilograms of stones for nearly 270 meters, and the farthest attack range of Nanjun's ballistas is doubled, and the stones will not be so water chestnut stones, it will be a kind of thing that can roll out of the sea of corpses and blood with a roll of roundness.

Lu Zhe is not an inventor, but he knows that a gadget in later generations is an invention until now. To be honest, he also thought about it for a long time before taking out those goods, after all, many things at different times will not be helpful and may even become a scourge. For example, if you take out the stirrups now, the people who will benefit the most will be the Hu people of the grassland. For example, now that a stone-throwing cart is coming out, then just wait for the sky in the Central Plains to be full of stones flying, and then the strong city defense of Nanling City will become the biggest joke.

Well, in fact, with a ballista, I don't want to build a stone throwing car, the manufacturing of ballista has a high technical content, think about the kind of complex products assembled with dozens or hundreds of parts, it is almost impossible to imitate without drawings. The range of the catapult has a certain amount, and the larger the body, the farther the attack range, but it also means that its structure will become larger, which will make it clear to people at a glance, and it is very convenient for craftsmen who are familiar with military equipment to imitate it.

In fact, there is an accidental reason for making a ballista, which is nothing more than that Lu Zhe saw the craftsman drumming the bed crossbow during an inspection, and then said a few more words. I also explained the combination of springs and gears, as well as the structure of the winch shaft and the grooves of the crossbow body, and a few craftsmen came to receive the reward about a month later.

When Lu Zhe arrived in Yuecheng, he didn't make a big fuss or anything, he checked the manufacturing workshop and the copper ingot storage warehouse and came to the weapons test site.

From a distance, Lu Zhe saw Mei Kai and several soldiers loading a bed crossbow that looked a little huge, and it seemed that it had been loaded with more than one?

Waiting for them to tighten the fifteen thick crossbow arrows, Mei Li himself was twisting the winch rod that was full of the arms of a man in the prime of life, and the sound of "click" and some tendon ropes continued for a while, and Mei Li took a hammer and struck on the crossbow device of the bed, and there was a sound in an instant. Then fifteen thick crossbow arrows whistled and shot out.

Eh, the multi-bed crossbow that only appeared in the Tang and Song dynasties? It looks a little similar, but Mei Kai's fiddling looks a little ugly, not as beautiful as in the Tang and Song dynasties.

When he flew more than 200 meters, he slammed into the ground, and the shaft of the crossbow was fully inserted into a third, and the trembling of the arrow body only lasted for a while before stopping.

Multi-loading crossbows, which could be loaded with five poles during the Tang Dynasty, had a range of about 500 steps. The crossbow arrows of the Song people were smaller, and they could be loaded with more than thirty crossbow arrows at a time. The range is about 400 paces, and it seems that there is a fire medicine booster?

When Mei Kai was about to measure the crossbow arrows that he had shot out, he saw Lu Zhe standing in the distance, he greeted the soldiers with a few words, and hurried over with his clothes in full clothes.

The Qin army also had bed crossbows. It can fire up to three arrows and have a range of up to seven hundred paces. There are also many styles of bed crossbows in the Qin army, the most common one is a bed crossbow that requires seven people to operate, which can be used in field battles or to defend cities. There is also a bed crossbow that needs to be pulled by a horse or ox. The firing range is as much as 1,800 meters according to the modern meter calculation, and it is widely used in the war of unification.

Nanjun's single-shot bed crossbow can actually have a range of 1,000 meters, and the quasi-head is also worse than Qin Jun's bed crossbow. What Lu Zhe didn't know was when this Yuecheng built a crossbow that could carry fifteen crossbows, and how could the shooting distance be only two hundred meters?

"County Lord!" Mei Kai seemed a little embarrassed, and after he saw the salute, he led Lu Zhe to the crossbow, "It seems that there is a problem with the string." This, hehe, that's why it's so close. ”

Lu Zhe took a closer look, the bed crossbow was equipped with two wheels, it was precisely because of this that the elevation angle of the guide was lowered, and it seemed that the choice of the bowstring was still a kind of cow tendon, which was often stretched and extended, which would definitely cause relaxation, and it would be really strange if it could shoot far.

"To improve it, the chariot should have the appearance of a chariot, the axles should not be in contact with the crossbow itself, add the necessary lathes, and then use springs to reduce the vibration of the bumps. Also, the bow is too small, and the bolt is too thick and not long enough. The arm bow should be enlarged, the stem bracket of the crossbow should be reduced, and the body of the arrow should be lengthened. Also, the bottom should be equipped with a high and low debugger, making full use of the brackets to adjust the elevation angle of the shot. The axle should also be improved so that the crossbow can steer with very little effort. The most important thing is ......" Lu Zhe grinned: "Don't forget to add the knot valve and card slot." ”

Mei Kai was already stunned, but the eyes of several craftsmen next to him were shining.

The craftsman pounced on the crossbow regardless of Lu Zhe's presence, they had long felt that it was a pity that the body would be shaken backwards every time they fired, so with valves and card slots, it could not only reduce the friction of the crossbow itself with the power of the postshock, but also control the distance, and then push forward to return the card slot to its position. In addition, some craftsmen are already wondering if it is possible to combine the clamp slot and valve device with the wheel to perform the winding action.

Look, in fact, that's what happened, the ancients were either stupid, or they didn't think so much, as long as they opened a window, contemporary people could chisel out a door. (To be continued......)

PS: Thank you to the two book friends of "@浮游" and "Reincarnation Nakato" for voting for their precious monthly passes!