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"What? Landing on the poor monk? Not only Zhang Yong, but also Zhang Sui was deeply inexplicable.

He explained: "Did Cui Xiang misunderstand something? It is rumored that the poor monk has magical powers, and he can even turn stones into gold, coal into silver or something, but that is just rumors, and he can't count them. ”

"Oh? Is it? Cui Geng said: "It is rumored that a master of the line, who knows astronomy, geography, and arithmetic, is not just a rumor, right?" ”

This topic scratched Zhang Sui's itch. He said happily: "Of course this is not a rumor, the poor monk really knows a little about the way of astronomy and geography. ”

"Then I heard that you have a good relationship with Liang Lingzan, a master of painting and mechanic, and it's not just a rumor?"

"It's not a secret, Liang Lingzan is here."

Cui Geng slapped a few cases and said, "That's right!" The three of us can work together to produce something that has never been done before, and not only will it be rich, but it will be famous for all eternity. ”

"What the hell is it?"

"A thing that can measure time accurately."

Zhang Sui was puzzled: "The thing that measures time? What is this unprecedented? ”

"Hehe, this thing is more precise than ever, and of course it's unprecedented. The official called it ...... Clock. ”

That's right, what Cui Geng wants to do is a clock.

In historical records, the world's first clock was made in the Kaiyuan period by Zhang Sui and Liang Lingzan.

At that time, the Tang Dynasty court used the "Lin De Calendar" compiled by Li Chunfeng. Indeed, Li Chunfeng is very great, and the compilation of "Lin De Calendar" is far better than that of the previous dynasties, and the early stage is also very accurate.

However, as time passed, the error became larger and larger, and the "Lin De Calendar" gradually became inaccurate.

The most distressing thing is the solar eclipse, and the date of the eclipse predicted by the "Linde Calendar" is always very different from the actual one.

In this era, we pay attention to the induction of heaven and man. People will ask, is it because of your immorality that the heavens have changed the days of the eclipse, and I want to warn you.

Li Longji had one head and two big, and hurriedly brought in a famous master to compile a more accurate calendar.

The compilation of the calendar, the most important thing is to observe the laws of the movement of celestial bodies, and the precision of the timekeeping instruments is very high.

In the end, Zhang Sui and Liang Lingzan cooperated to make a "water transport armillary sphere".

The instrument relies on water power to not only measure time, but also mimic the movement of celestial bodies.

In addition, Zhang Sui set up two wooden figures on this instrument, driven by gears, one wooden man automatically beats the drum every moment, and the other wooden man automatically hits the clock every hour, which is the world's earliest mechanical clock device and the ancestor of modern mechanical clocks.

Although this waterborne armillary sphere was gradually abandoned after being used for a period of time due to the gradual deterioration of copper and iron, it was already absolutely high-tech in this era.

In the end, Zhang Sui relied on the "water transportation armillary sphere" and worked hard to compile the "Great Yan Calendar", which is far more accurate than the "Scale and German Calendar".

Of course, it was impossible for Cui Geng to ask Zhang Sui to make any water transportation armillary sphere, that thing was too heavy and not practical, and it couldn't be sold for money at all.

In fact, a mechanical watch with hydraulically driven gears is not the right way to go.

What Cui Geng really wants to do is

He commanded, "Please bring three ropes, of different lengths, and under each rope hang a weighing stone." ”

"What do you mean?"

"The master will bring it first."

"Yes."

It didn't take much effort, and three ropes with weighing stones arrived.

Cui Geng hung the three ropes separately, then nudged each of them, and said, "Master of the line, you observe carefully, you should get something." ”

"Then the poor monk try it."

Cui Geng's fame was there, Zhang Sui didn't dare to slack off, and carefully observed the swing of the scales.

Zhang Yong didn't know why, so he also lay there and watched, and after a while, he was dizzy and dizzy.

Suddenly, he said quite vigilantly: "I heard that in the land of Tessie, there is a kind of hypnosis, which is to use a rope to hang a crystal ball and swing it back and forth. Cui Xiang, you don't want to use evil magic to harm people, right? ”

"What?" Cui Geng couldn't cry or laugh, and said: "Patriarch Zhang is too much of a villain's belly, and this official just wants to introduce a very interesting phenomenon to the masters of the line." ”

"Hmph, the old man can't see it, what's so interesting about hanging the scales and swinging them with a rope?"

"Well, let me remind you, take a closer look at the amplitude of the pendulum, and the time it takes to go back and forth......"

"I see!"

Zhang Sui was not only a great astronomer, Buddhist, and mechanic of his time, but also a top mathematician. In the process of compiling the Great Derivation Calendar, he even compiled the first Tangent Function Table in the history of mathematics in the world.

He is quite sensitive to numbers.

Zhang Sui said excitedly: "For a rope and a weighing stone, the magnitude of its swing has nothing to do with the time of going back and forth. In other words, the time it takes for the rope to swing once is only related to the length of the rope. ”

"The master of the line is really smart. With this discovery, it is not difficult to make an automatic timekeeping device, right? The official was not talented, and wanted to name this timekeeping device a pendulum clock. ”

The accuracy of the pendulum clock is guaranteed by the law of a single pendulum, and has little to do with the accuracy of the machinery. With the technology of this era, it should be able to barely build it.

However, Zhang Sui still didn't have much confidence and said distressedly: "How to use this phenomenon to time?" The poor monk is stupid, and he still has no ideas. ”

Cui Geng was stunned for a moment, and then said with a wry smile: "It's that the official is too optimistic." In this way, you use the gears to create an escapement......"

The escapement structure is the most fundamental principle of ancient and modern Chinese and foreign mechanical watches.

To put it simply, it is a wheel with a circle of sharp corners on the edge, and a horseshoe-shaped hook connected to a pendulum.

The wheel is driven by a clockwork through a number of gears, and it always wants to turn, but because there is a pesky hook next to it that trips the sharp corners of the rim, it has to wait for the hook to let go before it can turn.

The pesky hook is connected to the pendulum, and with each swing of the pendulum, the hook releases a sharp corner on the side of the wheel, causing the wheel to turn at an angle.

At the same time, every time the hook releases a sharp corner, it will be pushed by the force of the clockwork. In this way, the clock went down and clicked and went on and on.

The principle is not complicated, with Zhang Sui's intelligence, of course, he can understand it as soon as he listens to it.

He said excitedly, "I see. Listening to your words, it is better to read for ten years, and the poor monk is really taught today. Cui Xiang, please accept the poor monk's worship. ”

Cui Geng was a little weak-minded, the world's first escapement was invented by Zhang Sui. Now, people are thanking themselves for this, what is this called?

He hurriedly clasped his hands and said warmly: "Where, where, this official only has occasional gains." Presumably, if you give a group of masters a period of time, you can also come up with this method. ”

Zhang Yong was a little impatient and said, "That clock can really make money?" Not even a glass workshop and a frosting workshop? ”