Detective Di Renjie's legend of Wu Dynasty

Chapter 365 Luo River Hydrology
Wang Mang was thinking quietly, and said softly: "Cube..."

He suddenly remembered the piece of paper he picked up beside the cliff outside Hanguang Temple—a piece of paper hanging on a tree branch, fluttering back and forth with the breeze.

Wang Mang took it down and took a closer look. There was a cube model drawn on the paper, and beside it were formulas for arithmetic.

Wang Mang took a deep breath, and murmured, "Is there any intrinsic relationship between the cubes drawn on the straw paper and the cubes in the lotus pond?"

Li Yuanfang watched Wang Mang quietly.

Di Renjie turned around and started to pace the room slowly.

Suddenly, Di Renjie stopped in his tracks: "Cube, cube, arithmetic..."

Suddenly, a picture appeared in front of his eyes——

In the dungeon at the backyard of Hanguang Temple, Di Renjie leaned over to pick up the papers on the ground, and studied them carefully one by one.

Different cube models and arithmetic formulas are drawn on the paper.

Suddenly, he raised his head: "This seems to be a gate."

Li Yuanfang and Ruyan were taken aback, and hurried over.

Di Renjie laid the straw papers parallel to each other, then pointed to the model and calculation formula on it and said, "Look, here is a valve calculated by the side length, and the empty space should allow water to pass through.

These two diagonal lines are the center point of the calculated cube, and the buoyancy of water is used to make a huge buoyant float to control the opening and closing of the gate.

Once the water flow reaches the specified flow rate, the buoyancy float at the center point is touched, and the gate will automatically open..."

Li Yuanfang and Ruyan asked puzzledly: "What's the use of this? Could it be that the person in the prison wants to build a canal?"

Di Renjie smiled: "I think there is another mystery in this."

……

Di Renjie thought quietly, as if he saw a glimmer of light in the mist.

He raised his head and said, "In this lotus pond, the square surrounded by logs must be the gate drawn on the blueprint."

Li Yuanfang was puzzled: "My lord, what did you say?"

Wang Mang raised his head: "My lord, you mean those blueprints found in the dungeon!"

Di Renjie nodded: "Yes, this square must be related to the pictures drawn on those blueprints."

Wang Mang nodded slightly: "Yes, I think so too."

At this time, Li Yuanfang asked: "My lord, Jing Yang, what did you say earlier?"

Di Renjie said: "Yuan Fang, do you still remember the blueprints in the dungeon where Yuan Tiangang was imprisoned?"

Li Yuanfang nodded: "Of course I remember."

Di Renjie asked, "What is painted on it?"

Li Yuanfang was taken aback, and then said: "At that time, you seemed to be drawing a water gate."

Di Renjie nodded: "You and Ruyan also said that the prisoner is going to repair the canal..."

Li Yuanfang said: "Not bad, not bad, I remember."

He understood: "My lord, Jing Yang, are you saying that the gate designed by Yuan Tiangang is the square that Di Chun saw in the lotus pond today?"

Wang Mang and Di Renjie looked at each other and nodded slightly.

Wang Mang said, "Exactly. Is there any other explanation besides this?"

Di Renjie nodded: "Di Chun told me in the afternoon that when he sank into the water, he found that the lotus pond was very deep and the water was very muddy, but he could vaguely see a square surrounded by logs.

In fact, the cube he saw was just the upper half of the cube, while the lower half was hidden under deeper water, and the pond water was very turbid, so he didn't see it. "

As he spoke, Di Renjie picked up the brush on the table and drew a cube, pointed to the upper part, "This is the cube Di Chun saw."

Wang Mang nodded: "My lord agrees with what I think."

Li Yuanfang suddenly realized: "That's it!"

Di Renjie said: "It seems that this sluice is very big. However, the water in the lotus pond is stagnant water, so what's the use of the sluice?"

Wang Mang nodded: "This is really strange."

Di Renjie pondered for a while, then raised his head: "Yuan Fang, is Lu Cheng here?"

Li Yuanfang said: "He lives in Dongkua courtyard."

Di Renjie said, "Go and ask him to come over."

Li Yuanfang agreed to go out.

After Li Yuanfang left, Wang Mang said, "My lord, I'm afraid he won't say anything?"

Di Renjie laughed: "Don't worry, Jing Yang, he will say something just for acting."

Wang Mang nodded thoughtfully.

Suddenly, Wang Mang's ears moved slightly, he winked at Di Renjie, and said loudly to the door: "My lord, Lu Cheng is Yuan Tiangang's servant, he should know something."

A smile flashed in Di Renjie's eyes, and he nodded: "Yes, I hope I can gain something!"

As soon as the words fell, Li Yuanfang walked in with Lu Cheng.

Di Renjie nodded to Lu Cheng, pointed to the cube models and arithmetic papyrus found in the dungeon on the table and said: "Mr. Lu, please come and take a look at these drawings."

Lu Cheng walked over, and Di Renjie said: "We found these in the dungeon where Yuan Tiangang was imprisoned. You are proficient in arithmetic and making all kinds of actions. Please take a look. What are these things used for?"

Lu Cheng watched carefully. After a long time, he raised his head and pondered for a moment, then said, "This seems to be a sluice gate."

Li Yuanfang looked at Di Renjie with admiration in his eyes.

Di Renjie said, "It's the same as what I saw."

Lu Cheng said: "The design of this gate is very exquisite. The gate is opened and closed by buoyancy. It should be used for the trough of the diversion channel. My lord, you are, is this thing designed by my old master Yuan Tiangang?"

Di Renjie nodded and said, "It should be."

Lu Cheng asked puzzledly: "Why did he design the sluice? It's really strange. By the way, Jing Yang, you were also a student of the old master. Do you know when he designed the sluice?"

Wang Mang shook his head: "I don't know either. The teacher only taught me some medical and martial arts back then, and this manufacturing technique is only slightly involved."

Lu Cheng nodded.

Di Renjie said: "This is exactly the problem, Mr. Lu, you were by Yuan Tiangang's side before he was arrested, didn't you?"

Lu Cheng nodded: "Exactly. The old man has been with the old master for 36 years."

Di Renjie asked: "You must know him very well, right?"

Lu Cheng said: "It can be said so."

Di Renjie picked up the two ancient almanacs beside the table, handed them over, and said, "These are the two ancient almanacs found in his luggage. Please take a look. What is written on them?"

Lu Cheng hurriedly took it, opened it and looked at it carefully.

After a long time, he raised his head: "My lord, it's all about the weather, solar terms and water changes near the Luo River. It also records several sudden surges of the Luo River in ancient times, all of which are related to the solar terms."

Di Renjie was surprised: "Oh, you mean, these two almanacs describe the climate and hydrology near the Luo River?"

Lu Cheng nodded: "Exactly."

(End of this chapter)