When talking about the length of the Hanshu Chronicles, the Hanshu Law Chronicles says: "The degree is also a minute, an inch, a ruler, a zhang, and a citation, so the length of the degree is also." …… One is one point, ten inches, ten inches is a ruler, ten feet is a zhang, ten zhang is a guide, and five degrees of judgment. ”

The five units of length mentioned here are minutes, inches, rulers, zhangs, and leads, but there are no miles......

Of course, the lack of length is not due to the lack of length, but due to the lack of records for various reasons.

"Hanshu Food and Goods Chronicles" says: "The way to manage the people is based on the works of the earth." Therefore, it must be built to stand on the acre, and it is the boundary of its meridians. Six feet is a step, a hundred steps are acres, a hundred acres are husbands, three husbands are houses, three houses are liters, and one mile is a well, which is nine husbands. ”

From this record, it can be seen that the well is one mile, and the nine hundred acres of cultivated land cultivated by Jiufu are three hundred steps long on each side. One step of six feet, then one mile and three hundred steps is l800 feet.

After the Tang Dynasty, the construction ruler used by the Ministry of Industry was also called the ministry ruler, commonly known as the Luban ruler, also called the big ruler. An important feature of this type of ruler is that one step is five feet. The length of one foot is 1.25 feet of Qin ruler. In the volume of "Weights and Measures" of the "General Examination of Continued Literature", it is stated: "The ruler is the ruler used by carpenters today." As for the Tang Dynasty, the Tang people called it a big ruler. It has been used by the Tang Dynasty to the present, and it is called the present ruler, also known as the construction ruler. The ancient so-called lathe ruler. ”

Because the construction ruler is the scale used by the Ministry of Industry in the past dynasties, it has strong credibility and is widely used. With the development of society, it is a reasonable choice to calculate the length of the mile with a construction scale.

When the weights and measures are reset, it is clearly stipulated that the system is: "Five feet is one step, two steps are one zhang, ten zhang is one lead, and eighteen leads are one mile." "That was already the Guangxu period of the Qing Dynasty......

The absence of unified, standardized, scientific and rational weights and measures is a major drawback that restricts industrial development and natural science. Fang Jun once made a "world standard" to the Ministry of Industry, but with his departure from the Ministry of Industry, this idea died abruptly.

However, it seems that this idea must be put on the agenda, otherwise the length of "li" alone will make Fang Jun dizzy, and he still hasn't figured it out......

Su Dingfang was speechless: "How can you run so fast?" ”

Liang Renfang obviously heard of Su Dingfang's name, and admired this general who swept through Mobei, so he said respectfully: "Su Dudu doesn't know, the biggest advantage of this ship is not its speed, but his sail!" This complete set of sails is designed by the chief manager, and it is simply ingenious, and it can be equipped with this kind of sail, no matter whether it is good or bad! ”

Fang Jun smiled and said nothing, this has nothing to do with what kind of sail, it's just a simple aerodynamic principle, but it is such a simple principle of "when the fluid velocity increases, the pressure will decrease", he couldn't understand it after explaining to Liang Renfang for a long time, and finally Fang Jun, who was completely dead to "popular science", simply ordered directly - you don't need to know why, just do it!

It's simple and crude, but it's very easy to use.

Liu Renyuan, who was on the side, widened his eyes and said in disbelief: "Don't talk about it, you can wet your trousers when you pee in the wind, won't the boat be blown back against the wind?" ”

In his understanding, the main reason for a ship to sail on the sea is its sails, and the wind blows the sails to bring power and propel the ship forward. But if it is against the wind, then the force is reversed, how can it be possible to move forward?

Liang Renfang was polite to Su Dingfang, that was because Su Dingfang was a general who broke through the Turkic tooth tent, although the lord did not show that his position was not high, but the merits and achievements were there, and he was not so polite in the face of Liu Renyuan.

Who is this big guy and three thick guys? Haven't seen ......

Therefore, Liang Renfang said unceremoniously: "Everything in the world has a reason, so we must learn from things." Sand and gravel can be turned into crystal clear glass, ore can be turned into sharp and tough weapons, water can be turned into ice, clouds can turn into rain, why can't ships sail against the wind? ”

"This ......" Liu Renyuan was choked and rolled his eyes, but he couldn't think of a rebuttal.

Fang Jun pointed to the sailboat in the dock and said, "What's the point of arguing? The boat is there, let's pull it out and slip away, won't the truth be revealed? However, since Liu Xiaowei doesn't believe it, but Director Liang swears, and the two are not convinced, why don't you make a bet? ”

This is black technology, and I will definitely hack Liu Ren today.

Su Dingfang immediately nodded: "This is okay." ”

Watching the excitement is naturally not afraid of big things......

Pei Xingjian smiled: "Gambling money hurts feelings, and it's a bit vulgar, why don't you bet on a roast whole sheep, whoever loses tonight will be responsible for setting up a fire barbecue, and the rest of the people will sit back and enjoy the drinking and partying, how about it?" ”

Liu Renliang's face was expressionless: "A certain agrees." ”

Liu Renyuan glared at him and said, "Why do you expect that you will lose?" I don't believe it, if the sailboat can move forward against the wind, it is better to say that the river flows backwards and the sun rises in the west, and the bet is bet! ”

Fang Jun smiled and asked Liang Renfang: "What is Lord Liang's intentions?" ”

Nonsense, it's clear that it's a matter of winning, will Liang Renfang refuse?

Therefore, Liang Renfang stretched an old face that was three points darker than Fang Jun, and stretched out his short and thick fingers covered with calluses: "You have to roast two." ”

Liu Renyuan was so angry that he shouted: "Old man, don't be arrogant, if you can really sail against the wind, then our royal sailor has such an artifact, and he will be invincible on the sea, even if he roasts you for a lifetime, what can you do?" Hugh is going to show off his tongue here, quickly board the ship and raise the sails, and win or lose! ”

Hearing this, Liang Renfang changed his disdain for Liu Renyuan, stretched out his thumb and praised: "He is worthy of being a good man in the army, in order to have a sharp artifact in the army, he is invincible on the battlefield, and he is willing to bear any punishment, and he is worthy of the title of Datang soldier!" Win or lose tonight, please drink three glasses with someone! ”

Previously, Liang Renfang blamed Liu Renyuan for questioning his words, because he felt that Liu Renyuan was vulgar and rude, but at this moment, when he saw that the other party was indeed interested in the water master, his opinion was immediately greatly moved.

Liu Renyuan laughed and said: "Even so, we won't be drunk and homeless!" Hahaha, when it comes to drinking, who have you been afraid of? However, when he squinted, he saw Fang Jun's smiling expression next to him, as well as Su Dingfang, Liu Renliang, Pei Xingjian, and Xi Junmai's disgusted faces, and suddenly coughed dryly, blushing and said: "What's that, the chief manager naturally doesn't count, he is a marquis, and he is the boss, let's drink with him, it's not reasonable, right?" ”

Several comrades-in-arms made a gesture to Liu Renyuan that he had learned from Fang Jun not long ago—he raised his middle finger in unison, expressing contempt for Liu Renyuan's shamelessness.

Liu Renyuan blushed, and said angrily: "What are you doing looking at such a strange look? That's right, it's far inferior to the chief manager in terms of the amount of alcohol, but what does that matter to you? Defy? If you don't accept the battle, I will overturn you all one by one! ”

said arrogantly in his mouth, but secretly regretted that he had said the wrong thing in his heart.

He boasted that he had an amazing amount of alcohol and was put to the ground by Fang Jun not long ago, and he was so drunk that he was so dark that he never dared to brag about how powerful his drinking was in front of Fang Jun......

This black boy is really good at drinking!

Thinking about Fang Jun's drinking, Liu Renyuan's heart trembled......

No one paid any attention to him, so they all hurried down the hill and walked straight into the dock.

The four sailing ships were all of the same type, about forty meters long and about thirteen or fourteen meters wide, and the keel was three times the length of the ship.

A few people went up to the deck and looked around.

The sailors on the ship were all shipbuilders, and when they saw Liang Renfang leading a group of officers onto the ship, they all came out to see him.

At this time, a white-haired old man walked out of the cabin, and when he saw Fang Jun, he immediately said "oops", bowed slightly, and said with a smile: "Fang Shilang...... Look at my old fool, now I have to be called the chief manager, the old man see the chief manager, I haven't seen him for many days, the general manager's demeanor is better than in the past, the dragon walks and walks in a tiger's step, and he is full of energy! ”

It was actually Zheng Kunchang, the director of the Ministry of Water Affairs of the Ministry of Industry......

Why is this old man here?

Fang Jun hurriedly took two steps forward, picked up Zheng Kunchang and said, "Why did you come here too?" Aren't you hurting me? As far as you are an old bone, if you confess in this Huating Town one day, your children and grandchildren will come to me to pay money, won't Ben Hou go bankrupt......"

Zheng Kun often laughed and said: "The chief manager is the famous God of Wealth in the Tang Dynasty, and this old bone of the little old man is worth a few copper coins?" Let's do our last bit for our children and grandchildren, and give you a few dollars to enjoy the happiness of your children and grandchildren! ”