As the stone gate slowly rose to the top, there was no movement inside, and everyone looked inside, and there was a door 3 meters away.

Professor Chen looked inside carefully with a flashlight and said, "Lao Zhang, let's get on the detector and see if there are any gaps, now we need to be careful to enter." ”

"Okay, go get it now, Qin Gong will also prepare your guy."

After saying that, the two of them went back to the tunnel to get their equipment.

Professor Chen looked at the enthusiastic crowd on the side, and said to Feng Weiguo: "Director Feng, you let them get all the electricity and lights here, they will use it later." ”

After the arrangement, the local archaeologists asked Professor Chen, "Professor Chen, what is the principle of this stone gate?" In ancient times, there was no power source such as today's motors, how could this stone weigh several tons, and what did it rely on to lift it? I've read introductions in books in the past, but they're all general. ”

"Haha, this is actually very simple, a mechanism like this actually relies on the current lever principle, this kind of mechanism has a counterweight of the same weight as the stone gate behind it, and there is also a counterweight in the middle, so that they are balanced when designed, and then adjust the counterweight in the middle by triggering the button, come, I draw a sketch and you will understand it at a glance," After speaking, Professor Chen squatted on the ground and drew a sketch with a tree branch, and then explained to the man: "When the middle counterweight leans towards which side, it will inevitably cause an imbalance, It also produces the result of one side falling and the other side lifting, when one side drops to a certain limit, it will use a simple mechanical principle to drive the locking. For example, to ward off evil spirits is to adjust the direction of the counterweight, and the stones on the wall are to remove the locks, which is the basic lever principle. In short, such a mechanism seems simple, but it is actually the product of accurate calculation, and it is not easy to design a mechanism by carving a passage in the stone, and it is necessary to lay a mechanism in the crack of the stone. ”

"Your simple sketch is clear at a glance, and I finally understand that the counterweight in the middle is to play the role of four or two thousand pounds, thank you Professor Chen for your explanation! But what is it that pulls the counterweight? Ordinary ropes would have been rotten a long time ago, and if they were iron chains, they would have been elongated and deformed after a long time, and now it's strange about this. ”

"Generally iron chains, metal deformation is directly related to the load, if the production of iron chains can only withstand 1 ton of force, you arrange it to arrange a full load that is a ton of burden, then a long time will naturally cause deformation and even breakage, on the other hand, if the design bearing capacity is 1 ton, the load arranged for him is one-tenth? In this way, it will not be easily deformed and broken, and the frequency of use is low, so there will be basically no problems; Moreover, at that time, the iron chain was tempered in the real sense of the word in the production process, because those craftsmen knew that there was a price to pay for blood. ”

"Professor Chen, thank you for being my teacher! The things I learned before were all theoretical things, and I didn't involve the excavation of ancient tombs, I was sweeping the floor on large ruins, and I have always had a lot of doubts about the stone gate mechanism in the movie, but today I finally understand. ”

"Movies and so on are all science fiction without discipline, which is an insult to history and disrespect for science, and it is also called artistic packaging, which is sad. Alas, these are also the accumulation of experience, you can too, take your time, archaeology is a long process, you need to precipitate yourself and then fuse, don't just treat this as a career. ”

After speaking, Professor Chen ignored the crowd and walked into the cave, and outside the first stone gate, he looked at each stone brick from a distance.

While Professor Chan was meditating in front of the stone bricks, large LED lights and cables were connected into the hole.

In the dazzling light, you can roughly see the relief pattern on the stone gate in front of the corridor: there are animal carvings on both sides of the door that cannot be seen in shape.

The appearance of these stone bricks is roughly the same as that of the first stone gate, but there are some places where you can still see the difference, in addition to the same smoothness and thickness, the surface of the stone here is also of many specifications, and it is stacked with each other.

Zhang Gong and the others came back soon, opened the box, and took out a gap detector that was slightly larger than A4 paper, except for a few buttons on it, it was basically a display screen. Zhang Gong skillfully took out the camera and installed it on the aluminum alloy telescopic pole, and after connecting the signal cable, he asked Ma Kai to take the telescopic pole and scan the camera one by one on the stone brick gaps in front of him.

In the sound of dripping, Zhang Gong looked at the displayed data while drawing sketches and recording them in his notebook.

Everyone gathered around the entrance of the cave and watched, discussing in a low voice: "What is this for?" ”

"This could be a metal probe, right?"

"No, it's a probing mechanism."

Listening to the gossip outside, Professor Chen turned around and said to them kindly: "This is to detect the gaps in the stones, and through the analysis of the gaps, you can determine whether there is a hidden mechanism behind it." ”

"Professor Chen, what is the direct correlation between the size of the gap and the mechanism?"

"The size of the gap does not necessarily indicate whether there is a mechanism or not, but it can be confirmed by a comprehensive analysis of the depth and width."

"Then Professor Chen, what kind of dangerous traps have you encountered?"

"That's a lot, there are legendary hanging sword mechanisms, traditional machine crossbow mechanisms, chain flap mechanisms, etc., as long as you do preliminary detection and analysis, it is not dangerous."

Without waiting for the people outside the cave to ask any more questions, Zhang Gong shouted to Professor Chen, "Old Chen, come and take a look." ”

"What discovery?"

"This foot is all solid, it is carved in the mountain, there is no gap, there is no problem on the right side, but there is a problem on the wall on the left side, 1.5 meters in front of the ground 1.2 meters high There is a hollow in the back, and the length of the straight gap is 1.6 meters."

"What about height?"

"Height 40 centimeters."

"What do you think?"

"It's like a crossbow or something."

"Where's this trigger?"

"It should be the one that opens the door in a row, and the wrong opening will trigger."

"If it's confirmed to be a machine crossbow, then don't worry, you can find some thick wooden planks to block it, and the arrows can be saved, can you be sure?"

"The height of 40 centimeters and the length of 1.6 meters are not suitable for other institutions."

"Is it possible that there is a mechanism on the door?"

"It won't be! The top of the gate is also a mountain, and the back is empty except for the top gate stone that looks like a running stone. ”

"Then let's arrange it, in order to ensure safety, first use a thick wooden plank 50 centimeters away from the wall, use this to block the arrows that the crossbow may fire, and then study how to open this door."

"Okay, arrange it now."

"Ma Kai, you take pictures of every detail here," Professor Chen continued: "Director Feng, please also ask the Zhang Bureau of the Cultural Affairs Bureau to install the camera, and the armed police are also in place, after completing these, try to open the door before dark!" ”

Soon, Lao Ma brought some wooden planks from the construction site, and quickly arranged them according to Professor Chen's requirements. In a few moments, the cameras were installed and debugged, and the armed police were all in place, waiting for the stone gate to open.