"I think this carriage is still suitable for running on concrete roads, and it is a bit bumpy in the city."

Since it wasn't because of the lack of money, Li Tai didn't have to worry about the uselessness of his invention, so he turned the topic back to the car and the road again.

"The bumps in the city are mainly paved with bluestone, and it is impossible to make each stone so smooth by quarrying, and if each piece is polished and smooth, it is impossible for the whole Chang'an City to be built in less than a year. So it's normal to have some bumps." Wu Yuanqing said with a smile.

"I think these four-wheeled cars are better built, even on the concrete road, the two-wheeled ones are very bumpy, and I don't know why no one has made these four-wheeled cars before." Li Chengqian has a different opinion.

"It's not that we couldn't build it before, but our terrain is not suitable for four wheels, if you don't build a cement road, even if you build four wheels, there won't be many people." Wu Yuanqing said.

"That's right." As the fact of the four-wheeled carriage, the inventor Li Tai also nodded in agreement.

"Take Chang'an as an example, in addition to the smoothness of Chang'an City, the road becomes potholed as soon as you get out of the city, like this four-wheeled carriage is not suitable for walking at all, and it is easy to turn the car off. And thirty or forty miles out of the city starts to be a mountain road, the mountain road is very narrow, like a two-wheeled car can turn around in a very narrow place, but a four-wheeled vehicle can't do it, it needs more space, because its turn needs to draw a semi-circular arc."

After Li Tai finished speaking, Wu Yuanqing answered: "So the quality of the means of transportation is determined by the supporting road surface. Because no matter how good your car is, no matter how many wheels you have, if it is not suitable for the road, it will be useless, just like you can't buy a two-wheeler for someone who doesn't have even a good road and can only trek on his legs. What kind of road, what kind of car, that's the rule."

"That's right, like the train I'm about to build, it can only run on paved rails, and it can't go anywhere but on the tracks."

Looking at Wu Yuanqing, his younger brother Li Tai, you and I said it one by one, Li Chengqian was a little sad, he felt that he was left out and isolated by the two of them in terms of IQ.

Wu Yuanqing They don't know Li Chengqian's depression, they still talk about the heat, Li Chengqian doesn't understand what the suspension device that makes the four-wheeled vehicle steer, and he doesn't understand why the four-wheeled vehicle is comfortable to sit on, but Wu Yuanqing and Li Tai said that it is safer to talk about safety or two-wheeled vehicles.

Anyway, one of the two sentences is incomprehensible, this is depressing.

Fortunately, Li Chengqian is not a tangled person, he calmed down after being depressed for a while, if he doesn't understand, he doesn't understand, anyway, he doesn't need to know these things when dealing with government affairs, and professional things are left to professional people to do, which is what Wu Yuanqing taught him.

Shiping walked for almost two days, the first day was to rest at a post station, and the second day was at noon to the hunting ground.

Then Li Shimin's bow and arrow were already hungry and thirsty, and after arriving, he simply ate something and rushed to the mountains and forests with his entourage.

Wu Yuanqing, Li Tai, and Li Chengqian also carried many things into the mountains and forests with the guards.

After reaching a flat slope, several guards took off the long package they were carrying and spread it on the ground and opened it.

Inside were neatly stacked with all kinds of muskets of all lengths, strips, gun cloths, and all kinds of ammunition in sewn pockets.

"Why are there so many of them?" Li Chengqian asked with a surprised face.

The palace is not a place where you can play with guns, not to mention the lethality of this thing, the key is that it is easy to carry and hide or a long-range attack weapon, if there is such a thing into the palace, the emperor's safety can still be guaranteed?

Li Chengqian, who has lived in the palace for a long time, is just the two muskets that Wu Yuanqing asked the craftsmen at home to make many years ago.

He also knew that his younger brother Li Tai had researched and improved the musket, but Li Tai did these things in the prince's palace outside the palace, and he never showed them to the public, so he heard about it but never saw it.

Compared with Li Chengqian, Wu Yuanqing is much calmer, most of them have played here, and there are hidden goods at home, and he has basically seen them all, and he has never seen one of them, which is the main test of this trip.

"This is..."Li Tai introduced it to Li Chengqian, the name is very simple, it is according to the royal number one to the back row, the kind of flintlock short musket that Wu Yuanqing made at the beginning is the royal one, then the second, the third and so on.

In fact, many of them are only improved by some small parts, but they are all named by Li Tai.

There are only a few that really have leapfrog upgrades and improvements, and Wu Yuanqing has provided suggestions to help.

One was later known as the Hall M1819 rifle, which was a rear-loading gun, but it was still flint-fired, which was a huge improvement over the Royal One, which was the first musket to be built.

One is the Migne rifle, which uses the Migne bullet, which is a front-loading gun, that is, the ammunition is loaded from the barrel, and the most critical and convenient point of this gun is the bullet, that is, the Minne bullet. It is more like the bullet with a primer in later generations, and because of the structure of this bullet, the air tightness of the gun chamber is greatly increased, and the range is much more powerful.

Wu Yuanqing and Li Tai have tested that the range of this gun can reach seven or eight hundred steps, and the effective range is almost three or four hundred steps. Far more than bows and arrows, but handmade is expensive, and it is completely impossible to equip the army, so make a few out to play by yourself.

The other is the more advanced Dresser rifle, which is a breech-loading rifle and is fired from a percussion primer.

This kind of gun and bullet are similar to the firearms of the later twentieth century, both firing and loading. The bullet of this gun is a projectile, an initiating charge and gunpowder are all contained in a cylindrical paper cartridge case, which is actually the same as the fixed paper bullet of the Royal No. 1 manufactured by Wu Yuanqing, which is an upgraded version.

But its initiating charge is not mounted in the tail of the cartridge case, but in the middle of the bottom surface of the projectile. When the trigger is pulled, the force of the spring releases the slender firing pin on the collider, pierces the bottom of the paper shell in the chamber from the front end of the bolt, and continues to the detonator at the bottom of the projectile and detonates it, and then ignites the gunpowder in the paper case.

This kind of gun wears out very quickly, because the slender firing pin really can't withstand the cauterization of gunpowder several times.

Moreover, the initiating charge Li Tai in it is made of saltpeter and flint milled powder, which is actually the same firing principle as a flintlock pistol, that is, the firing pin rubs the flint to produce sparks.

The firing rate of this ammunition is simply outrageously low.

Then there is another Chasebo rifle with a more advanced design, but the problem with the bullet is the same as the previous one, limited by the firing rate of the primer, and it is still a defective product.

The latest one to be tested is still this problem, anyway, until there is no way to solve the problem of the success rate of primer firing, these guns can only be defective no matter how they are improved.

Compared to it, it is not as easy to use as the flintlock pistol that Wu Yuanqing started, and it is not as easy to use as the Mine gun that uses Minne bullets.

But it's still that sentence, the cost is too expensive, the manufacturing is too time-consuming, at most it's just Wu Yuanqing's plaything.

When will the cost come down before it can be installed in the army.

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