A team of fast horses rushed out of Chang'an City to chase Zhang Jiuling, who had been away for a few days.

The meeting in the court will continue to be held, and Zhang Jiuling's matter will be talked about when he catches up, and now he will ask the Guangzhou City Bo Division.

"The minister asked the Guangzhou Assassin to report the variety and quantity of goods bought and sold by the people of Guangzhou and Kunlun, and if the quantity is too large, the market should be opened."

Yao Chong didn't know how many things needed to be exchanged in Guangzhou, and if he opened the market rashly, he would definitely send people to manage it, which would waste money and grain.

Zhang said to take a sip of tea and put down the cup: "Your Majesty, but Li Yi mentioned it?" ”

"Hmm!" Li Longji responded.

"The minister thought that he should immediately start to set up a city department." Zhang said that when he got the answer, he immediately supported it.

Lu Huaishen glanced at Zhang Shuo and said to Li Longji: "Your Majesty, what did Li Yi say?" ”

"Take the initiative to go out and sell, use silk and ceramics to exchange things outside, and finally come back to pull a boatload of grain and collect taxes." Li Longji did not hide it.

"We need a city boss. Ryuze will be happy. Yao Chong didn't need to ask again.

When you go out to sell things, you can control the quantity by yourself, you can have a lot, and there is a department to manage it.

Lu Huaishen echoed: "One more boatload of grain will give more than 100 households a year's food, accumulate it, and transport it one by one, even if there is some loss on the road, the people will definitely be less hungry." ”

Li Longji bowed, he hadn't thought about how to eat that grain yet, it was early.

He looked at Yuan Qianyao, it's your turn.

Yuan Qianyao lowered his head and pondered, and after a while, he said: "When the personnel are outside, it is difficult to understand words, and there may be conflicts in the market, which will damage the prestige of the Tang Dynasty, so be cautious." ”

He paused for a moment, and then said: "However, the city should be opened, but the Kunlun people's taxes should not be collected to show the kindness of the Tang Dynasty." ”

"I see." Li Longji did not draw conclusions.

The four of them retired with interest and returned to the political hall.

In the evening, Li Longji's family of three went to Li's Zhuangzi, and Queen Wang took the little guy to run wildly.

Since the little guy can run, he can't be idle, unlike some children who always feel tired and let the adults hug them, and the little ones don't want to be held.

"The third brother is here, just to see the model made." Li Yi took Li Longji to the river.

A small dam was built along the river, and the water increased its velocity when it arrived, simulating Hukou Waterfall.

Next to the waterfall there is a smaller river, and a boat a few inches long passes through the gates.

First it stopped at a low place, then the gate behind it closed, and the current continued to flow, and the water surface rose to a height above the platform, and the boat passed.

Continuing on, it came to a location with a gate, the boat stopped, closed the gate, and the water level rose.

"Third brother, look, the river is dug out from the side of Hukou Waterfall, and it goes up layer by layer, and more than a dozen boats at a time."

Li Yi used a small model to demonstrate and explain.

Repeat the following and reverse the operation.

Li Longji looked at it: "Good idea, what about the other one?" ”

"The other one is here." Li Yi took Li Longji to change places, not far away.

Similarly, simulating a waterfall in the mouth of the pot, a board is placed diagonally, the angle of inclination is not large, and there is a row of rollers on top of the board.

Li Yi tied the boat with a rope and pulled it to the inclined board, the bottom of the boat touched the roller, the roller rotated, and the boat was pulled up.

The board is laid flat, right on the track, the rails, there are wheels underneath the board, the kind of wheels of the train, stuck on the tracks.

Pull the rope on the board, the wheels roll, and the board moves forward on the rails.

To the other side, there is a rope behind the board, tilting, and the boat slides down.

"Brother Yi, just this railroad track, I use a lot of iron, but now I can afford it." Li Longji made a choice.

"Don't you want to rise gradually?" Li Yi thinks the first one is good.

"The stones of Hukou Waterfall are too hard, they are raised again and again, too many stones need to be chiseled, and there is not enough water, and the water around the mouth of the pot is converging towards the mouth."

Li Longji explained to Li Yi, don't look at the interest model is good, it's useless.

The line of rails is originally a dryland boat, and it is convenient to have rails.

Li Yi lowered his head and thought about it, showing an embarrassed smile: "I forgot that our current technical level is not enough to support it." ”

He pulled the planks back and forth on the rails: "The rails don't use much iron, and the boat that was originally intended to use two hundred and fifty stone for itself was decided to be one hundred stone. ”

Li Yi thought about a fifteen-ton ship before, and found that with rails, the ship sank, and the rails should be able to withstand it.

It is equally tiring to pull a fifteen-ton ship with a hand hoist, and it is relatively easy to change it to six tons and one hundred stones.

The key is the rollers on the planks, the heavy weight of the boat will crush the rollers.

Li Longji squatted down and looked at the railroad tracks: "The two sides of the rails are paved with cement, and livestock are used to pull them to make two rails, one up and one down. ”

"Okay, I can fill the railroad tracks and build it in winter." Li Yi's method of making railroad tracks is irrigation.

Li Longji looked at the track again and proposed: "If there are only 100 stones, use a wooden track, and the wheels can be iron, and walk on the wooden track." ”

Li Yi looked up at the sky, and he calculated the force area of the six-ton thing and the pressure bearing capacity of the wood.

A steamer of a hundred stones, laid down on a wooden plank, under which eight wheels were mounted.

"A boat of one hundred and fifty stone will do, and the wooden track will be fine." Li Yi also wants to increase the cargo volume of the ship.

"You can build a few more, and then see if it works, and if it doesn't work, it will be used in other rivers."

Li Longji can't calculate, but he will try.

"Okay, from 100 stones to 300 stones, make five kinds." Li Yi agreed, and each one increased by fifty stones.

It doesn't matter if the boat is a little wider or narrower, just put it on the board and keep the spacing between the wheels under the board unchanged.

"Today's court on the establishment of the Guangzhou City Bo Division, everyone agrees, but Yuan Qianyao does not think that sending a team out is beneficial to Datang."

Li Longji was about to go back and ask people to repair the wooden track at Hukou Waterfall, and then talked about the matter of the city.

After he finished talking about Yuan Qianyao's worries, Li Yi pursed his lips: "It's just a business, how can it damage Datang's reputation, Datang will take the initiative to bully others?" ”

Li Yi found that Yuan Qianyao lacked heart and eyes, and at such a moment, he considered other people's opinions.

Without collecting taxes from outsiders, Li Yi smiled: "If you don't collect other people's taxes and don't take the initiative to buy and sell, what is the meaning of the existence of the city?" ”

"What's the good stuff out there?" Li Longji didn't care what Yuan Qianyao said, and Yuan Qianyao couldn't decide.

"That's a lot, ivory, pearls, coral, hawksbill turtles, gold and silver, animals and plants that have never been seen before, spices.

Let's exchange what we can grow, their smelting skills are not very good, and iron tools can also be exchanged for things, such as knives and iron pots. ”

Li Yi said a few things briefly, what he valued was gold and silver, spices and grain.

Ivory, rhinoceros horn, as traditional Chinese medicine? Hawksbill turtles, corals and pearls can also be used in medicine.

"Okay, you should go out and build more ships." Li Longji doesn't care about anything, anyway, he pays less and gets more.

"I have maps, charts." Li Yi added a fire.

"You don't need to exchange your lifespan, and when the time comes, let them go on their own, and their predecessors will leave something behind." Li Longji asked first.

Li Yi shook his head: "No life." ”

Li Longji smiled: "The more the merrier." ”